file-online-preview/jodconverter-web/src/main/java/cn/keking/web/controller/OnlinePreviewController.java

package cn.keking.web.controller;

import cn.keking.config.ConfigConstants;
import cn.keking.model.FileAttribute;
import cn.keking.service.FilePreview;
import cn.keking.service.FilePreviewFactory;

import cn.keking.service.cache.CacheService;
import cn.keking.utils.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.*;
import java.util.Arrays;
import java.util.Base64;
import java.util.List;

/**
 * @author yudian-it
 */
@Controller
public class OnlinePreviewController {

    private static final Logger LOGGER = LoggerFactory.getLogger(OnlinePreviewController.class);

    @Autowired
    FilePreviewFactory previewFactory;

    @Autowired
    CacheService cacheService;

    @Autowired
    private FileUtils fileUtils;

    private String fileDir = ConfigConstants.getFileDir();

    /**
     * @param url
     * @param model
     * @return
     */
    @RequestMapping(value = "onlinePreview", method = RequestMethod.GET)
    public String onlinePreview(String url, Model model, HttpServletRequest req) {
        FileAttribute fileAttribute = fileUtils.getFileAttribute(url);
        req.setAttribute("fileKey", req.getParameter("fileKey"));
        model.addAttribute("officePreviewType", req.getParameter("officePreviewType"));
        model.addAttribute("originUrl", req.getRequestURL().toString());
        FilePreview filePreview = previewFactory.get(fileAttribute);
        return filePreview.filePreviewHandle(url, model, fileAttribute);
    }

    /**
     * 多图片切换预览
     *
     * @param model
     * @param req
     * @return
     * @throws UnsupportedEncodingException
     */
    @RequestMapping(value = "picturesPreview", method = RequestMethod.GET)
    public String picturesPreview(String urls, String currentUrl, Model model, HttpServletRequest req) throws UnsupportedEncodingException {
        // 路径转码
        String decodedUrl = URLDecoder.decode(urls, "utf-8");
        String decodedCurrentUrl = URLDecoder.decode(currentUrl, "utf-8");
        // 抽取文件并返回文件列表
        String[] imgs = decodedUrl.split("\\|");
        List imgurls = Arrays.asList(imgs);
        model.addAttribute("imgurls", imgurls);
        model.addAttribute("currentUrl",decodedCurrentUrl);
        return "picture";
    }

    @RequestMapping(value = "picturesPreview", method = RequestMethod.POST)
    public String picturesPreview(Model model, HttpServletRequest req) throws UnsupportedEncodingException {
        String urls = req.getParameter("urls");
        String currentUrl = req.getParameter("currentUrl");
        // 路径转码
        String decodedUrl = URLDecoder.decode(urls, "utf-8");
        String decodedCurrentUrl = URLDecoder.decode(currentUrl, "utf-8");
        // 抽取文件并返回文件列表
        String[] imgs = decodedUrl.split("\\|");
        List imgurls = Arrays.asList(imgs);
        model.addAttribute("imgurls", imgurls);
        model.addAttribute("currentUrl",decodedCurrentUrl);
        return "picture";
    }
    /**
     * 根据url获取文件内容
     * 当pdfjs读取存在跨域问题的文件时将通过此接口读取
     *
     * @param urlPath
     * @param resp
     */
    @RequestMapping(value = "/getCorsFile", method = RequestMethod.GET)
    public void getCorsFile(String urlPath, HttpServletResponse resp) {
        InputStream inputStream = null;
        try {
            String strUrl = urlPath.trim();
            URL url = new URL(new URI(strUrl).toASCIIString());
            //打开请求连接
            URLConnection connection = url.openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
            httpURLConnection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            inputStream = httpURLConnection.getInputStream();
            byte[] bs = new byte[1024];
            int len;
            while (-1 != (len = inputStream.read(bs))) {
                resp.getOutputStream().write(bs, 0, len);
            }
        } catch (IOException | URISyntaxException e) {
            LOGGER.error("下载pdf文件失败", e);
        } finally {
            if (inputStream != null) {
                IOUtils.closeQuietly(inputStream);
            }
        }
    }


    @RequestMapping(value = "/getPDFImage", method = RequestMethod.GET)
    @ResponseBody
    public String getPDFImage(String urlPath, Integer dpi, Integer page) {
        FileAttribute fileAttribute = fileUtils.getFileAttribute(urlPath);
        String fileName = fileAttribute.getName();
        String fullFileName = fileDir + fileName;
        String result = "";
        InputStream is = null;
        try {
            File dirFile = new File(fileDir);
            if (!dirFile.exists()) {
                dirFile.mkdirs();
            }
            String strUrl = urlPath.trim();
            URL url = new URL(new URI(strUrl).toASCIIString());
            //打开请求连接
            URLConnection connection = url.openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
            httpURLConnection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            is = httpURLConnection.getInputStream();
            FileOutputStream os = new FileOutputStream(fullFileName);
            byte[] buffer = new byte[4 * 1024];
            int read;
            while ((read = is.read(buffer)) > 0) {
                os.write(buffer, 0, read);
            }
            os.close();

            try {
                String imageFileSuffix = ".jpg";
                File pdfFile = new File(fullFileName);
                PDDocument doc = PDDocument.load(pdfFile);
                int pageCount = doc.getNumberOfPages();
                if (page >= pageCount) {
                    return result;
                }
                PDFRenderer pdfRenderer = new PDFRenderer(doc);

                int index = fullFileName.lastIndexOf(".");
                String folder = fullFileName.substring(0, index);

                File path = new File(folder);
                if (!path.exists()) {
                    path.mkdirs();
                }
                String imageFilePath;

                imageFilePath = folder + File.separator + page + imageFileSuffix;
                BufferedImage image = pdfRenderer.renderImageWithDPI(page, dpi, ImageType.RGB);
                ImageIOUtil.writeImage(image, imageFilePath, dpi);
                File imgFile = new File(imageFilePath);
                FileInputStream in = new FileInputStream(imgFile);
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                byte[] b = new byte[1024];
                int i = 0;
                while ((i = in.read(b)) != -1) {
                    out.write(b, 0, b.length);
                }
                out.close();
                in.close();
                String base64Image = "data:image/jpeg;base64," + Base64.getEncoder().encodeToString(out.toByteArray());
                out.close();
                result = base64Image;

                doc.close();
            } catch (IOException e) {
                LOGGER.error("Convert pdf to jpg exception", e);
            }

        } catch (IOException | URISyntaxException e) {
            LOGGER.error("下载pdf文件失败", e);
        } finally {
            if (is != null) {
                IOUtils.closeQuietly(is);
            }
        }
        return result;
    }

    /**
     * 通过api接口入队
     * @param url 请编码后在入队
     */
    @GetMapping("/addTask")
    @ResponseBody
    public String addQueueTask(String url) {
        cacheService.addQueueTask(url);
        return "success";
    }

}