修改

src/main/java/com/jtyjy/pdf2pptx/converter/Pdf2Pptx.java

@@ -93,7 +93,11 @@ public class Pdf2Pptx {
                 executorService.execute(new PdfTask(allot.get(String.valueOf(i)), path));
             }
         }
-
+        try {
+            Thread.sleep(2000);
+        } catch (InterruptedException e) {
+            logger.error("错误：{}", e);
+        }
         while (exeFlag) {
             if (((ThreadPoolExecutor) executorService).getActiveCount() == 0) {
                 executorService.shutdown();
@@ -104,7 +108,12 @@ public class Pdf2Pptx {
         }
         long endTime = System.currentTimeMillis();
         logger.info("总耗时：{}ms", endTime - startTime);
-        //删除图片文件夹
+        //删除所有生成的图片文件
+        for (String dirPathName : allDirPathName) {
+            if (dirPathName.endsWith("_图片") && FileUtil.delFolder(dirPathName)) {
+                logger.info("删除文件夹：{}及其文件成功", dirPathName);
+            }
+        }
 
     }
 
@@ -138,6 +147,14 @@ public class Pdf2Pptx {
     public static void main(String[] args) {
         //读取指定文件夹下所有文件并转换为图片
 //        conver(Constant.SOURCE_PATH);
+        //删除所有生成的图片文件
+        List<String> allDirPathName = new ArrayList<>();
+        FileUtil.getAllDirPathNameRe(Constant.SOURCE_PATH, allDirPathName);
+        for (String dirPathName : allDirPathName) {
+            if (dirPathName.endsWith("_图片") && FileUtil.delFolder(dirPathName)) {
+                logger.info("删除文件夹：{}及其文件成功", dirPathName);
+            }
+        }
     }
 
 }

src/main/java/com/jtyjy/pdf2pptx/support/MyTask.java

@@ -40,7 +40,7 @@ public class MyTask implements Runnable {
                 imgFilePath.append(String.valueOf(i + 1));
                 imgFilePath.append(".png");
                 File dstFile = new File(imgFilePath.toString());
-                BufferedImage image = renderer.renderImageWithDPI(i, 300);
+                BufferedImage image = renderer.renderImageWithDPI(i, 250);
                 logger.info("线程：{} 开始转换第{}页pdf", Thread.currentThread().getName(), i);
                 ImageIO.write(image, "png", dstFile);
             }