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tif 优化多线程转换方法

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高雄
2026-01-09 17:36:37 +08:00
parent 595f3f55f2
commit b5579ae890
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server/src/main/java/cn/keking/utils/ConvertPicUtil.java
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package cn.keking.utils;
import cn.keking.config.ConfigConstants;
import cn.keking.service.FileHandlerService;
import cn.keking.web.filter.BaseUrlFilter;
import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.io.FileChannelRandomAccessSource;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.RandomAccessFileOrArray;
import com.itextpdf.text.pdf.codec.TiffImage;
import org.apache.commons.imaging.Imaging;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.List;
public class ConvertPicUtil {
private static final int FIT_WIDTH = 500;
private static final int FIT_HEIGHT = 900;
private final static Logger logger = LoggerFactory.getLogger(ConvertPicUtil.class);
private final static String fileDir = ConfigConstants.getFileDir();
/**
* Tif 转 JPG。
*
* @param strInputFile 输入文件的路径和文件名
* @param strOutputFile 输出文件的路径和文件名
* @return boolean 是否转换成功
*/
public static List<String> convertTif2Jpg(String strInputFile, String strOutputFile, boolean forceUpdatedCache) throws Exception {
List<String> listImageFiles = new ArrayList<>();
String baseUrl = BaseUrlFilter.getBaseUrl();
strOutputFile = strOutputFile.substring(0, strOutputFile.lastIndexOf('.'));
File tiffFile = new File(strInputFile);
if (!tiffFile.exists()) {
logger.info("找不到文件【{}】", strInputFile);
return null;
}
File outputDir = new File(strOutputFile);
if (!outputDir.exists() && !outputDir.mkdirs()) {
throw new IOException("创建目录失败: " + strOutputFile);
}
List<BufferedImage> images;
try {
images = Imaging.getAllBufferedImages(tiffFile);
for (int i = 0; i < images.size(); i++) {
String fileName = strOutputFile + File.separator + i + ".jpg";
File outputFile = new File(fileName);
// 如果需要强制更新缓存或者文件不存在，则转换
if (forceUpdatedCache || !outputFile.exists()) {
BufferedImage image = images.get(i);
// 写入JPG格式
boolean success = ImageIO.write(image, "png", outputFile);
if (!success) {
throw new IOException("无法写入JPG格式图片: " + fileName);
}
logger.debug("转换图片: {}", fileName);
} else {
logger.debug("使用缓存图片: {}", fileName);
}
// 构建URL
String relativePath = fileName.replace(fileDir, "");
String url = baseUrl + WebUtils.encodeFileName(relativePath);
listImageFiles.add(url);
}
} catch (IOException e) {
if (!e.getMessage().contains("Only sequential, baseline JPEGs are supported at the moment")) {
logger.error("TIF转JPG异常，文件路径：{}", strInputFile, e);
}
throw new Exception(e);
}
return listImageFiles;
}
/**
* 将Jpg图片转换为Pdf文件
*
* @param strJpgFile 输入的jpg的路径和文件名
* @param strPdfFile 输出的pdf的路径和文件名
*/
public static String convertJpg2Pdf(String strJpgFile, String strPdfFile) throws Exception {
Document document = new Document();
RandomAccessFileOrArray rafa = null;
FileOutputStream outputStream = null;
try {
RandomAccessFile aFile = new RandomAccessFile(strJpgFile, "r");
FileChannel inChannel = aFile.getChannel();
FileChannelRandomAccessSource fcra = new FileChannelRandomAccessSource(inChannel);
rafa = new RandomAccessFileOrArray(fcra);
int pages = TiffImage.getNumberOfPages(rafa);
outputStream = new FileOutputStream(strPdfFile);
PdfWriter.getInstance(document, outputStream);
document.open();
Image image;
for (int i = 1; i <= pages; i++) {
image = TiffImage.getTiffImage(rafa, i);
image.scaleToFit(FIT_WIDTH, FIT_HEIGHT);
document.add(image);
}
} catch (IOException e) {
if (!e.getMessage().contains("Bad endianness tag (not 0x4949 or 0x4d4d)") ) {
logger.error("TIF转JPG异常，文件路径：" + strPdfFile, e);
}
throw new Exception(e);
} finally {
if (document != null) {
document.close();
}
if (rafa != null) {
rafa.close();
}
if (outputStream != null) {
outputStream.close();
}
}
return strPdfFile;
}
}