mirror of
https://gitee.com/kekingcn/file-online-preview.git
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855 lines
34 KiB
Java
855 lines
34 KiB
Java
package cn.keking.service;
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import cn.keking.config.ConfigConstants;
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import cn.keking.model.FileAttribute;
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import cn.keking.service.cache.NotResourceCache;
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import jakarta.annotation.PostConstruct;
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import jakarta.annotation.PreDestroy;
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import org.apache.commons.lang3.exception.ExceptionUtils;
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import org.apache.pdfbox.Loader;
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import org.apache.pdfbox.pdmodel.PDDocument;
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import org.apache.pdfbox.rendering.ImageType;
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import org.apache.pdfbox.rendering.PDFRenderer;
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import org.apache.pdfbox.tools.imageio.ImageIOUtil;
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import org.apache.poi.EncryptedDocumentException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.stereotype.Component;
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import org.springframework.util.CollectionUtils;
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import org.springframework.util.ObjectUtils;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.locks.ReentrantLock;
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/**
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* PDF转JPG服务 - JDK 21 高性能优化版本（使用虚拟线程和结构化并发）
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*/
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@Component
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public class PdfToJpgService {
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private final FileHandlerService fileHandlerService;
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// JDK 21: 使用虚拟线程池
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private ExecutorService virtualThreadExecutor;
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private static final Logger logger = LoggerFactory.getLogger(PdfToJpgService.class);
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private static final String PDF_PASSWORD_MSG = "password";
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private static final String PDF2JPG_IMAGE_FORMAT = ".jpg";
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private static final int BATCH_SIZE = 20;
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private static final int PARALLEL_BATCH_THRESHOLD = 100;
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private final Semaphore concurrentTaskSemaphore;
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private final ConcurrentHashMap<String, ReentrantLock> fileLocks = new ConcurrentHashMap<>();
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// 性能监控
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private final AtomicInteger activeTaskCount = new AtomicInteger(0);
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private final AtomicInteger totalCompletedTasks = new AtomicInteger(0);
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// 存储正在运行的任务
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private final ConcurrentHashMap<String, Future<?>> runningTasks = new ConcurrentHashMap<>();
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// 加密PDF缓存管理（内存缓存，10分钟过期）
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private final ConcurrentHashMap<String, EncryptedPdfCache> encryptedPdfCacheMap = new ConcurrentHashMap<>();
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// JDK 21: 使用虚拟线程调度器
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private final ScheduledExecutorService virtualCacheCleanupScheduler;
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// 加密PDF缓存记录类
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private static class EncryptedPdfCache {
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private final long cacheTime;
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private final int pageCount;
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private final String outputFolder;
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EncryptedPdfCache(int pageCount, String outputFolder) {
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this.cacheTime = System.currentTimeMillis();
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this.pageCount = pageCount;
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this.outputFolder = outputFolder;
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}
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int pageCount() { return pageCount; }
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String outputFolder() { return outputFolder; }
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boolean isExpired(long expireTimeMillis) {
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return System.currentTimeMillis() - cacheTime > expireTimeMillis;
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}
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}
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public PdfToJpgService(FileHandlerService fileHandlerService) {
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// JDK 21: 创建使用虚拟线程的调度器
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this.fileHandlerService = fileHandlerService;
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this.virtualCacheCleanupScheduler = Executors.newSingleThreadScheduledExecutor(
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Thread.ofVirtual().name("pdf-cache-cleaner-", 0).factory()
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);
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// 设置最大并发任务数为50（可根据配置调整）
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int maxConcurrentTasks = ConfigConstants.getPdfMaxThreads();
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this.concurrentTaskSemaphore = new Semaphore(maxConcurrentTasks);
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}
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@PostConstruct
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public void init() {
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int maxThreads = ConfigConstants.getPdfMaxThreads();
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// 使用固定大小的虚拟线程池
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this.virtualThreadExecutor = Executors.newFixedThreadPool(maxThreads,
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Thread.ofVirtual().name("pdf-converter-", 0).factory());
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logger.info("PDF转换虚拟线程池初始化完成，最大线程数: {}", maxThreads);
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// 启动缓存清理任务
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scheduleCacheCleanup();
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}
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@PreDestroy
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public void shutdown() {
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logger.info("开始关闭PDF转换服务...");
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try {
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// 1. 取消所有运行中的任务
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cancelAllRunningTasks();
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// 2. 先清理内存缓存（这时执行器还可用）
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clearAllMemoryCaches();
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// 3. 并行关闭调度器和执行器
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List<CompletableFuture<Void>> shutdownFutures = new ArrayList<>();
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shutdownFutures.add(CompletableFuture.runAsync(this::shutdownCacheCleanupScheduler));
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shutdownFutures.add(CompletableFuture.runAsync(this::shutdownVirtualThreadExecutor));
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// 等待所有关闭操作完成（最多30秒）
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CompletableFuture.allOf(shutdownFutures.toArray(new CompletableFuture[0]))
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.get(30, TimeUnit.SECONDS);
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} catch (TimeoutException e) {
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logger.warn("PDF转换服务关闭超时，强制关闭剩余资源");
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forceShutdown();
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} catch (Exception e) {
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logger.error("关闭PDF转换服务时发生异常", e);
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forceShutdown();
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}
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logger.info("PDF转换服务已完全关闭");
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}
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/**
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* 取消所有运行中的任务
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*/
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private void cancelAllRunningTasks() {
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int cancelledCount = 0;
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// 使用keySet的快照，避免并发修改
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Set<String> taskNames = new HashSet<>(runningTasks.keySet());
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for (String taskName : taskNames) {
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Future<?> future = runningTasks.get(taskName);
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if (future != null) {
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try {
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if (future.cancel(true)) {
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cancelledCount++;
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logger.debug("已取消任务: {}", taskName);
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}
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} catch (Exception e) {
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logger.warn("取消任务失败: {}", taskName, e);
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}
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}
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}
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runningTasks.clear();
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logger.info("已取消 {} 个运行中的PDF转换任务", cancelledCount);
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}
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/**
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* 关闭缓存清理调度器
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*/
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private void shutdownCacheCleanupScheduler() {
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virtualCacheCleanupScheduler.shutdown();
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try {
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if (!virtualCacheCleanupScheduler.awaitTermination(10, TimeUnit.SECONDS)) {
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virtualCacheCleanupScheduler.shutdownNow();
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if (!virtualCacheCleanupScheduler.awaitTermination(5, TimeUnit.SECONDS)) {
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logger.warn("缓存清理调度器未完全关闭");
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}
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}
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} catch (InterruptedException e) {
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virtualCacheCleanupScheduler.shutdownNow();
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Thread.currentThread().interrupt();
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}
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}
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/**
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* 关闭虚拟线程池
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*/
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private void shutdownVirtualThreadExecutor() {
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if (virtualThreadExecutor != null && !virtualThreadExecutor.isShutdown()) {
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virtualThreadExecutor.shutdown();
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try {
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if (!virtualThreadExecutor.awaitTermination(30, TimeUnit.SECONDS)) {
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virtualThreadExecutor.shutdownNow();
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if (!virtualThreadExecutor.awaitTermination(10, TimeUnit.SECONDS)) {
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logger.warn("虚拟线程池未完全关闭");
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}
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}
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} catch (InterruptedException e) {
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virtualThreadExecutor.shutdownNow();
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Thread.currentThread().interrupt();
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}
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}
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}
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/**
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* 强制关闭（当优雅关闭失败时使用）
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*/
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private void forceShutdown() {
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// 先清理缓存（同步方式）
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try {
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if (!encryptedPdfCacheMap.isEmpty()) {
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logger.info("强制关闭时同步清理 {} 个缓存", encryptedPdfCacheMap.size());
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for (EncryptedPdfCache cache : encryptedPdfCacheMap.values()) {
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try {
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deleteCacheFolder(cache.outputFolder());
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} catch (Exception e) {
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logger.warn("清理缓存目录失败: {}", cache.outputFolder(), e);
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}
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}
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encryptedPdfCacheMap.clear();
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}
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} catch (Exception e) {
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logger.error("强制关闭时清理缓存失败", e);
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}
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// 关闭执行器
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if (virtualCacheCleanupScheduler != null && !virtualCacheCleanupScheduler.isShutdown()) {
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virtualCacheCleanupScheduler.shutdownNow();
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}
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if (virtualThreadExecutor != null && !virtualThreadExecutor.isShutdown()) {
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virtualThreadExecutor.shutdownNow();
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}
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runningTasks.clear();
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}
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/**
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* 清理所有内存缓存
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*/
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private void clearAllMemoryCaches() {
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try {
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int cacheCount = encryptedPdfCacheMap.size();
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if (cacheCount > 0) {
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// 检查执行器是否可用
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if (virtualThreadExecutor == null || virtualThreadExecutor.isShutdown() || virtualThreadExecutor.isTerminated()) {
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logger.warn("执行器已关闭，同步清理缓存目录");
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for (EncryptedPdfCache cache : encryptedPdfCacheMap.values()) {
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deleteCacheFolder(cache.outputFolder());
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}
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encryptedPdfCacheMap.clear();
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logger.info("同步清理了 {} 个内存缓存", cacheCount);
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} else {
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// 并行清理所有缓存目录
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List<CompletableFuture<Void>> cleanupFutures = new ArrayList<>();
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for (EncryptedPdfCache cache : encryptedPdfCacheMap.values()) {
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cleanupFutures.add(CompletableFuture.runAsync(() ->
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deleteCacheFolder(cache.outputFolder()), virtualThreadExecutor));
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}
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CompletableFuture.allOf(cleanupFutures.toArray(new CompletableFuture[0]))
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.get(60, TimeUnit.SECONDS);
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encryptedPdfCacheMap.clear();
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logger.info("清理了 {} 个内存缓存", cacheCount);
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}
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}
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} catch (Exception e) {
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logger.error("清理内存缓存时发生异常", e);
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// 即使出错，也要确保清理缓存条目
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encryptedPdfCacheMap.clear();
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}
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}
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/**
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* 调度缓存清理
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*/
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private void scheduleCacheCleanup() {
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// 每5分钟执行一次缓存清理
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virtualCacheCleanupScheduler.scheduleAtFixedRate(() -> {
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try {
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cleanupExpiredEncryptedCache();
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monitorCacheStatistics();
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} catch (Exception e) {
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logger.error("缓存清理任务执行失败", e);
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}
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}, 1, 5, TimeUnit.MINUTES); // 首次延迟1分钟，然后每5分钟执行一次
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logger.info("缓存清理任务已启动（每5分钟执行一次）");
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}
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/**
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* 监控缓存统计信息
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*/
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private void monitorCacheStatistics() {
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try {
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int totalCaches = encryptedPdfCacheMap.size();
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if (totalCaches > 0) {
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// 统计过期缓存
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long expireTime = 10 * 60 * 1000L; // 10分钟
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int expiredCount = 0;
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for (EncryptedPdfCache cache : encryptedPdfCacheMap.values()) {
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if (cache.isExpired(expireTime)) {
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expiredCount++;
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}
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}
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if (expiredCount > 0) {
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logger.debug("缓存监控: 总数={}, 已过期={}, 过期比例={}%",
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totalCaches, expiredCount, (expiredCount * 100 / totalCaches));
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}
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}
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} catch (Exception e) {
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logger.error("监控缓存统计时发生异常", e);
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}
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}
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/**
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* 优化的缓存清理方法（使用虚拟线程并行处理）
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*/
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private void cleanupExpiredEncryptedCache() {
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long startTime = System.currentTimeMillis();
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try {
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long expireTimeMillis = 10 * 60 * 1000L; // 10分钟过期
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// 收集过期的键
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List<String> expiredKeys = new ArrayList<>();
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for (Map.Entry<String, EncryptedPdfCache> entry : encryptedPdfCacheMap.entrySet()) {
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if (entry.getValue().isExpired(expireTimeMillis)) {
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expiredKeys.add(entry.getKey());
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}
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}
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int cleanedCount = expiredKeys.size();
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if (cleanedCount > 0) {
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logger.info("开始清理 {} 个过期的加密PDF缓存...", cleanedCount);
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// 并行删除文件和清理缓存
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List<CompletableFuture<Void>> deletionFutures = new ArrayList<>();
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for (String cacheKey : expiredKeys) {
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EncryptedPdfCache cache = encryptedPdfCacheMap.get(cacheKey);
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if (cache == null) {
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continue;
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}
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CompletableFuture<Void> future = CompletableFuture.runAsync(() -> {
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// 原子移除，如果已经被其他线程移除，则返回null
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EncryptedPdfCache removed = encryptedPdfCacheMap.remove(cacheKey);
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if (removed != null) {
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// 删除文件目录
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deleteCacheFolderConcurrent(removed.outputFolder());
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}
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}, virtualThreadExecutor);
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deletionFutures.add(future);
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}
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// 等待所有删除任务完成
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try {
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CompletableFuture.allOf(deletionFutures.toArray(new CompletableFuture[0]))
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.get(5, TimeUnit.MINUTES);
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} catch (TimeoutException e) {
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logger.warn("缓存清理任务执行超时");
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} catch (Exception e) {
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logger.error("缓存清理任务失败", e);
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}
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long elapsedTime = System.currentTimeMillis() - startTime;
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logger.info("清理了 {} 个过期的加密PDF缓存，耗时 {}ms", cleanedCount, elapsedTime);
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}
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} catch (Exception e) {
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logger.error("清理加密PDF缓存时发生异常", e);
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}
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}
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/**
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* 并发安全的目录删除
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*/
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private void deleteCacheFolderConcurrent(String folderPath) {
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try {
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Path path = Paths.get(folderPath);
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if (Files.exists(path)) {
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// JDK 21: 使用 Files.walk 流式删除
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try (var paths = Files.walk(path)) {
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paths.sorted(Comparator.reverseOrder())
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.forEach(p -> {
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try {
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Files.deleteIfExists(p);
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} catch (IOException e) {
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logger.debug("删除文件失败: {}", p, e);
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}
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});
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}
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logger.debug("已删除缓存目录: {}", folderPath);
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}
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} catch (Exception e) {
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logger.error("删除缓存目录失败: {}", folderPath, e);
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throw new RuntimeException("删除目录失败: " + folderPath, e);
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}
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}
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/**
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* 目录删除方法
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*/
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private void deleteCacheFolder(String folderPath) {
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deleteCacheFolderConcurrent(folderPath);
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}
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/**
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* 添加加密PDF缓存记录
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*/
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private void addEncryptedPdfCache(String pdfFilePath, int pageCount, String outputFolder) {
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EncryptedPdfCache cache = new EncryptedPdfCache(pageCount, outputFolder);
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encryptedPdfCacheMap.put(pdfFilePath, cache);
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if (logger.isDebugEnabled()) {
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logger.debug("加密PDF缓存已添加: {}, 页数: {}", pdfFilePath, pageCount);
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}
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}
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/**
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* 获取加密PDF的缓存（如果存在且未过期）
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* @param pdfFilePath PDF文件路径（缓存键）
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* @return 图片URL列表，如果缓存不存在或过期则返回null
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*/
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public List<String> getEncryptedPdfCache(String pdfFilePath) {
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Integer cachedPageCount = loadEncryptedPdfCache(pdfFilePath);
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if (cachedPageCount != null) {
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return generateImageUrlsFromCache(pdfFilePath, cachedPageCount);
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}
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return null;
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}
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/**
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* 检查加密PDF缓存是否存在且有效（简版）
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* @param outFilePath PDF输出文件路径
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* @return 如果缓存存在返回true，否则返回false
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*/
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public boolean hasEncryptedPdfCacheSimple(String outFilePath) {
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try {
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List<String> cache = getEncryptedPdfCache(outFilePath);
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return cache != null && !cache.isEmpty();
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} catch (Exception e) {
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logger.warn("检查加密PDF缓存失败: {}", outFilePath, e);
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return false;
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}
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}
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/**
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* 加载加密PDF缓存
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*/
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private Integer loadEncryptedPdfCache(String pdfFilePath) {
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EncryptedPdfCache cache = encryptedPdfCacheMap.get(pdfFilePath);
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if (cache != null) {
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// 检查是否过期（10分钟）
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if (cache.isExpired(10 * 60 * 1000L)) {
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// 立即移除过期缓存
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encryptedPdfCacheMap.remove(pdfFilePath);
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logger.debug("移除过期缓存: {}", pdfFilePath);
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return null;
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}
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logger.debug("从缓存加载加密PDF: {}, 页数: {}", pdfFilePath, cache.pageCount());
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return cache.pageCount();
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}
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return null;
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}
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/**
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* 从缓存目录生成图片URL列表
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*/
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private List<String> generateImageUrlsFromCache(String pdfFilePath, int pageCount) {
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List<String> imageUrls = new ArrayList<>(pageCount);
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for (int i = 0; i < pageCount; i++) {
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String imageUrl = fileHandlerService.getPdf2jpgUrl(pdfFilePath, i);
|
||
imageUrls.add(imageUrl);
|
||
}
|
||
logger.debug("从加密PDF缓存生成 {} 个图片URL: {}", pageCount, pdfFilePath);
|
||
return imageUrls;
|
||
}
|
||
|
||
/**
|
||
* PDF转JPG - 高性能主方法
|
||
*/
|
||
public List<String> pdf2jpg(String fileNameFilePath, String pdfFilePath,
|
||
FileAttribute fileAttribute) throws Exception {
|
||
boolean forceUpdatedCache = fileAttribute.forceUpdatedCache();
|
||
boolean usePasswordCache = fileAttribute.getUsePasswordCache();
|
||
String filePassword = fileAttribute.getFilePassword();
|
||
boolean semaphoreAcquired = false;
|
||
// 添加信号量控制
|
||
try {
|
||
if (!concurrentTaskSemaphore.tryAcquire()) {
|
||
throw new RejectedExecutionException("系统繁忙，请稍后再试");
|
||
}
|
||
semaphoreAcquired = true;
|
||
// 检查缓存 - 区分加密和非加密文件
|
||
if (!forceUpdatedCache) {
|
||
if (ObjectUtils.isEmpty(filePassword) || usePasswordCache) {
|
||
// 非加密文件：使用原有的缓存机制
|
||
List<String> cacheResult = fileHandlerService.loadPdf2jpgCache(pdfFilePath);
|
||
if (!CollectionUtils.isEmpty(cacheResult)) {
|
||
return cacheResult;
|
||
}
|
||
} else {
|
||
// 加密文件：使用内存缓存（10分钟有效期）
|
||
Integer cachedPageCount = loadEncryptedPdfCache(pdfFilePath);
|
||
if (cachedPageCount != null) {
|
||
// 从缓存目录加载图片URL
|
||
return generateImageUrlsFromCache(pdfFilePath, cachedPageCount);
|
||
}
|
||
}
|
||
}
|
||
ReentrantLock fileLock = fileLocks.computeIfAbsent(pdfFilePath, k -> new ReentrantLock());
|
||
fileLock.lock();
|
||
|
||
try {
|
||
// 验证文件存在
|
||
File pdfFile = new File(fileNameFilePath);
|
||
if (!pdfFile.exists()) {
|
||
logger.error("PDF文件不存在: {}", fileNameFilePath);
|
||
return null;
|
||
}
|
||
|
||
// 创建输出目录
|
||
int index = pdfFilePath.lastIndexOf(".");
|
||
String folder = pdfFilePath.substring(0, index);
|
||
File path = new File(folder);
|
||
if (!path.exists() && !path.mkdirs()) {
|
||
logger.error("创建转换文件目录失败: {}", folder);
|
||
throw new IOException("无法创建输出目录");
|
||
}
|
||
|
||
// 加载PDF文档获取页数
|
||
int pageCount;
|
||
try (PDDocument tempDoc = Loader.loadPDF(pdfFile, filePassword)) {
|
||
pageCount = tempDoc.getNumberOfPages();
|
||
} catch (IOException e) {
|
||
handlePdfLoadException(e, pdfFilePath);
|
||
throw new Exception("PDF文件加载失败", e);
|
||
}
|
||
|
||
// 根据页数选择最佳转换策略
|
||
List<String> imageUrls;
|
||
long startTime = System.currentTimeMillis();
|
||
|
||
// 根据页数选择不同的转换策略
|
||
if (pageCount <= PARALLEL_BATCH_THRESHOLD) {
|
||
imageUrls = convertOptimizedParallelVirtual(pdfFile, filePassword, pdfFilePath, folder, pageCount);
|
||
} else {
|
||
imageUrls = convertHighPerformanceVirtual(pdfFile, filePassword, pdfFilePath, folder, pageCount);
|
||
}
|
||
|
||
long elapsedTime = System.currentTimeMillis() - startTime;
|
||
|
||
// 缓存结果 - 区分加密和非加密文件
|
||
if (ObjectUtils.isEmpty(filePassword) ||usePasswordCache) {
|
||
// 非加密文件：使用原有的缓存机制
|
||
fileHandlerService.addPdf2jpgCache(pdfFilePath, pageCount);
|
||
} else{
|
||
// 加密文件：使用内存缓存（10分钟有效期）
|
||
addEncryptedPdfCache(pdfFilePath, pageCount, folder);
|
||
}
|
||
|
||
// 性能统计
|
||
logger.info("PDF转换完成: 总页数={}, 耗时={}ms, DPI={}, 文件: {}, 活动任务: {}",
|
||
pageCount, elapsedTime, ConfigConstants.getOptimizedDpi(pageCount),
|
||
pdfFilePath, activeTaskCount.get());
|
||
|
||
return imageUrls;
|
||
} finally {
|
||
fileLock.unlock();
|
||
// 可选：清理长时间不用的锁
|
||
cleanupStaleFileLock(pdfFilePath, fileLock);
|
||
}
|
||
} finally {
|
||
if (semaphoreAcquired) {
|
||
concurrentTaskSemaphore.release();
|
||
}
|
||
}
|
||
}
|
||
|
||
private void cleanupStaleFileLock(String pdfFilePath, ReentrantLock lock) {
|
||
// 如果锁没有被持有且没有等待线程，则清理
|
||
if (!lock.isLocked() && lock.getQueueLength() == 0) {
|
||
fileLocks.remove(pdfFilePath, lock);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 高性能并行转换 - 使用虚拟线程
|
||
*/
|
||
private List<String> convertHighPerformanceVirtual(File pdfFile, String filePassword,
|
||
String pdfFilePath, String folder, int pageCount) {
|
||
List<String> imageUrls = Collections.synchronizedList(new ArrayList<>(pageCount));
|
||
AtomicInteger successCount = new AtomicInteger(0);
|
||
int batchCount = (pageCount + BATCH_SIZE - 1) / BATCH_SIZE;
|
||
int dpi = ConfigConstants.getOptimizedDpi(pageCount);
|
||
|
||
logger.info("使用虚拟线程高性能并行转换，总页数: {}, 批次数: {}, DPI: {}, 超时: {}秒",
|
||
pageCount, batchCount, dpi, calculateTimeoutByPageCount(pageCount));
|
||
|
||
// 使用虚拟线程执行批次任务
|
||
List<CompletableFuture<List<String>>> batchFutures = new ArrayList<>();
|
||
|
||
for (int batchIndex = 0; batchIndex < batchCount; batchIndex++) {
|
||
final int batchStart = batchIndex * BATCH_SIZE;
|
||
final int batchEnd = Math.min(batchStart + BATCH_SIZE, pageCount);
|
||
final int currentBatch = batchIndex;
|
||
|
||
CompletableFuture<List<String>> batchFuture = CompletableFuture.supplyAsync(() -> {
|
||
activeTaskCount.incrementAndGet();
|
||
List<String> batchUrls = new ArrayList<>();
|
||
|
||
try {
|
||
// 每个批次独立加载PDF文档
|
||
try (PDDocument batchDoc = Loader.loadPDF(pdfFile, filePassword)) {
|
||
batchDoc.setResourceCache(new NotResourceCache());
|
||
PDFRenderer renderer = new PDFRenderer(batchDoc);
|
||
renderer.setSubsamplingAllowed(true);
|
||
|
||
for (int pageIndex = batchStart; pageIndex < batchEnd; pageIndex++) {
|
||
try {
|
||
String imageFilePath = folder + File.separator + pageIndex + PDF2JPG_IMAGE_FORMAT;
|
||
BufferedImage image = renderer.renderImageWithDPI(
|
||
pageIndex,
|
||
dpi,
|
||
ImageType.RGB
|
||
);
|
||
|
||
ImageIOUtil.writeImage(image, imageFilePath, dpi);
|
||
image.flush();
|
||
|
||
String imageUrl = fileHandlerService.getPdf2jpgUrl(pdfFilePath, pageIndex);
|
||
batchUrls.add(imageUrl);
|
||
successCount.incrementAndGet();
|
||
|
||
} catch (Exception e) {
|
||
logger.error("转换页 {} 失败: {}", pageIndex, e.getMessage());
|
||
// 添加占位符URL
|
||
String placeholderUrl = fileHandlerService.getPdf2jpgUrl(pdfFilePath, pageIndex);
|
||
batchUrls.add(placeholderUrl);
|
||
}
|
||
}
|
||
|
||
if (logger.isDebugEnabled()) {
|
||
logger.debug("批次{}完成: 转换{}页", currentBatch, batchUrls.size());
|
||
}
|
||
}
|
||
} catch (Exception e) {
|
||
logger.error("批次{}处理失败: {}", currentBatch, e.getMessage());
|
||
// 为整个批次添加占位符URL
|
||
for (int pageIndex = batchStart; pageIndex < batchEnd; pageIndex++) {
|
||
batchUrls.add(fileHandlerService.getPdf2jpgUrl(pdfFilePath, pageIndex));
|
||
}
|
||
} finally {
|
||
activeTaskCount.decrementAndGet();
|
||
totalCompletedTasks.incrementAndGet();
|
||
}
|
||
|
||
return batchUrls;
|
||
}, virtualThreadExecutor);
|
||
|
||
batchFutures.add(batchFuture);
|
||
}
|
||
|
||
// 等待所有任务完成
|
||
int timeout = calculateTimeoutByPageCount(pageCount);
|
||
try {
|
||
CompletableFuture<Void> allBatches = CompletableFuture.allOf(
|
||
batchFutures.toArray(new CompletableFuture[0])
|
||
);
|
||
allBatches.get(timeout, TimeUnit.SECONDS);
|
||
|
||
// 收集结果
|
||
for (CompletableFuture<List<String>> future : batchFutures) {
|
||
try {
|
||
List<String> batchUrls = future.getNow(null);
|
||
if (batchUrls != null) {
|
||
imageUrls.addAll(batchUrls);
|
||
}
|
||
} catch (Exception e) {
|
||
logger.warn("获取批次结果失败", e);
|
||
}
|
||
}
|
||
} catch (TimeoutException e) {
|
||
logger.warn("PDF转换超时，已转换页数: {}，超时时间: {}秒", successCount.get(),
|
||
calculateTimeoutByPageCount(pageCount));
|
||
} catch (Exception e) {
|
||
logger.error("批量转换失败", e);
|
||
}
|
||
|
||
logger.info("虚拟线程转换完成: 成功转换 {} 页", successCount.get());
|
||
return sortImageUrls(imageUrls);
|
||
}
|
||
|
||
/**
|
||
* 优化并行转换 - 使用虚拟线程（针对100页以内的文件）
|
||
*/
|
||
private List<String> convertOptimizedParallelVirtual(File pdfFile, String filePassword,
|
||
String pdfFilePath, String folder, int pageCount) {
|
||
int dpi = ConfigConstants.getOptimizedDpi(pageCount);
|
||
|
||
logger.info("使用虚拟线程批处理并行转换，总页数: {}, DPI: {}, 超时: {}秒",
|
||
pageCount, dpi, calculateTimeoutByPageCount(pageCount));
|
||
|
||
// 按CPU核心数划分批次
|
||
int optimalBatchSize = Math.max(1, Math.min(pageCount / 4, 10)); // 每批最多10页
|
||
|
||
logger.debug("推荐批次大小: {}", optimalBatchSize);
|
||
|
||
List<String> allImageUrls = Collections.synchronizedList(new ArrayList<>(pageCount));
|
||
AtomicInteger successCount = new AtomicInteger(0);
|
||
|
||
// 创建并提交所有批次任务
|
||
List<CompletableFuture<Void>> batchFutures = new ArrayList<>();
|
||
|
||
for (int batchStart = 0; batchStart < pageCount; batchStart += optimalBatchSize) {
|
||
final int startPage = batchStart;
|
||
final int endPage = Math.min(batchStart + optimalBatchSize, pageCount);
|
||
|
||
CompletableFuture<Void> batchFuture = CompletableFuture.runAsync(() -> {
|
||
activeTaskCount.incrementAndGet();
|
||
|
||
try {
|
||
// 每个批次独立加载PDF
|
||
try (PDDocument batchDoc = Loader.loadPDF(pdfFile, filePassword)) {
|
||
batchDoc.setResourceCache(new NotResourceCache());
|
||
PDFRenderer renderer = new PDFRenderer(batchDoc);
|
||
renderer.setSubsamplingAllowed(true);
|
||
|
||
for (int pageIndex = startPage; pageIndex < endPage; pageIndex++) {
|
||
try {
|
||
String imageFilePath = folder + File.separator + pageIndex + PDF2JPG_IMAGE_FORMAT;
|
||
BufferedImage image = renderer.renderImageWithDPI(
|
||
pageIndex,
|
||
dpi,
|
||
ImageType.RGB
|
||
);
|
||
|
||
ImageIOUtil.writeImage(image, imageFilePath, dpi);
|
||
image.flush();
|
||
|
||
String imageUrl = fileHandlerService.getPdf2jpgUrl(pdfFilePath, pageIndex);
|
||
synchronized (allImageUrls) {
|
||
allImageUrls.add(imageUrl);
|
||
}
|
||
|
||
successCount.incrementAndGet();
|
||
|
||
} catch (Exception e) {
|
||
logger.error("转换页 {} 失败: {}", pageIndex, e.getMessage());
|
||
// 添加占位符
|
||
String placeholderUrl = fileHandlerService.getPdf2jpgUrl(pdfFilePath, pageIndex);
|
||
synchronized (allImageUrls) {
|
||
allImageUrls.add(placeholderUrl);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (logger.isDebugEnabled()) {
|
||
logger.debug("批次 {}-{} 完成，转换 {} 页",
|
||
startPage, endPage - 1, (endPage - startPage));
|
||
}
|
||
}
|
||
} catch (Exception e) {
|
||
logger.error("批次 {}-{} 加载失败: {}", startPage, endPage - 1, e.getMessage());
|
||
// 为整个批次添加占位符
|
||
for (int pageIndex = startPage; pageIndex < endPage; pageIndex++) {
|
||
synchronized (allImageUrls) {
|
||
allImageUrls.add(fileHandlerService.getPdf2jpgUrl(pdfFilePath, pageIndex));
|
||
}
|
||
}
|
||
} finally {
|
||
activeTaskCount.decrementAndGet();
|
||
totalCompletedTasks.incrementAndGet();
|
||
}
|
||
}, virtualThreadExecutor);
|
||
|
||
batchFutures.add(batchFuture);
|
||
}
|
||
|
||
// 等待所有批次完成
|
||
int timeout = calculateTimeoutByPageCount(pageCount);
|
||
try {
|
||
CompletableFuture<Void> allBatches = CompletableFuture.allOf(
|
||
batchFutures.toArray(new CompletableFuture[0])
|
||
);
|
||
allBatches.get(timeout, TimeUnit.SECONDS);
|
||
} catch (TimeoutException e) {
|
||
logger.warn("优化转换超时，已转换页数: {}，超时时间: {}秒", successCount.get(),
|
||
calculateTimeoutByPageCount(pageCount));
|
||
} catch (Exception e) {
|
||
logger.error("优化并行转换异常", e);
|
||
}
|
||
|
||
logger.debug("优化并行转换完成: 成功转换 {} 页", successCount.get());
|
||
return sortImageUrls(allImageUrls);
|
||
}
|
||
|
||
/**
|
||
* 处理PDF加载异常
|
||
*/
|
||
private void handlePdfLoadException(Exception e, String pdfFilePath) throws Exception {
|
||
Throwable[] throwableArray = ExceptionUtils.getThrowables(e);
|
||
for (Throwable throwable : throwableArray) {
|
||
if (throwable instanceof IOException || throwable instanceof EncryptedDocumentException) {
|
||
if (e.getMessage().toLowerCase().contains(PDF_PASSWORD_MSG)) {
|
||
logger.info("PDF文件需要密码: {}", pdfFilePath);
|
||
throw new Exception(PDF_PASSWORD_MSG, e);
|
||
}
|
||
}
|
||
}
|
||
logger.error("加载PDF文件异常, pdfFilePath：{}", pdfFilePath, e);
|
||
throw new Exception("PDF文件加载失败", e);
|
||
}
|
||
|
||
/**
|
||
* 计算超时时间
|
||
*/
|
||
private int calculateTimeoutByPageCount(int pageCount) {
|
||
if (pageCount <= 50) {
|
||
return ConfigConstants.getPdfTimeoutSmall(); // 小文件：90秒
|
||
} else if (pageCount <= 200) {
|
||
return ConfigConstants.getPdfTimeoutMedium(); // 中等文件：180秒
|
||
} else if (pageCount <= 500) {
|
||
return ConfigConstants.getPdfTimeoutLarge(); // 大文件：300秒
|
||
} else {
|
||
return ConfigConstants.getPdfTimeoutXLarge(); // 超大文件：600秒
|
||
}
|
||
}
|
||
|
||
|
||
/**
|
||
* 按页码排序
|
||
*/
|
||
private List<String> sortImageUrls(List<String> imageUrls) {
|
||
List<String> sortedImageUrls = new ArrayList<>(imageUrls);
|
||
sortedImageUrls.sort((url1, url2) -> {
|
||
try {
|
||
String pageStr1 = url1.substring(url1.lastIndexOf('/') + 1, url1.lastIndexOf('.'));
|
||
String pageStr2 = url2.substring(url2.lastIndexOf('/') + 1, url2.lastIndexOf('.'));
|
||
return Integer.compare(Integer.parseInt(pageStr1), Integer.parseInt(pageStr2));
|
||
} catch (Exception e) {
|
||
return 0;
|
||
}
|
||
});
|
||
return sortedImageUrls;
|
||
}
|
||
|
||
|
||
} |