优化：（内部）移除为pdf文档提供base64缩略图

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

@@ -8,10 +8,6 @@ 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;
@@ -24,11 +20,9 @@ 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;
 
 /**
@@ -132,86 +126,6 @@ public class OnlinePreviewController {
         }
     }
 
-
-    @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