/**  *   * @param srcPath 原图片地址  * @param desPath 目标图片地址  * @param desFileSize 指定图片大小,单位kb  * @param accuracy 精度,递归压缩的比率,建议小于0.9  * @return  */  public static String commPressPiCForScale(String srcPath,String desPath,  long desFileSize , double accuracy){  try {  File srcFile = new File(srcPath);  long srcFilesize = srcFile.length();  System.out.PRintln("原图片:"+srcPath + ",大小:" + srcFilesize/1024 + "kb");  //递归压缩,直到目标文件大小小于desFileSize  commpressPicCycle(desPath, desFileSize, accuracy);    File desFile = new File(desPath);  System.out.println("目标图片:" + desPath + ",大小" + desFile.length()/1024 + "kb");  System.out.println("图片压缩完成!");  } catch (Exception e) {  e.printStackTrace();  }  return desPath;  }   public static void commpressPicCycle(String desPath , long desFileSize,  double accuracy) throws IOException{  File imgFile = new File(desPath);  long fileSize = imgFile.length();  //判断大小,如果小于500k,不压缩,如果大于等于500k,压缩  if(fileSize <= desFileSize * 500){  return;  }  //计算宽高  BufferedImage bim = ImageIO.read(imgFile);  int imgWidth = bim.getWidth();  int imgHeight = bim.getHeight();  int desWidth = new BigDecimal(imgWidth).multiply(     new BigDecimal(accuracy)).intValue();   int desHeight = new BigDecimal(imgHeight).multiply(     new BigDecimal(accuracy)).intValue();   Thumbnails.of(desPath).size(desWidth, desHeight).outputQuality(accuracy).toFile(desPath);   //如果不满足要求,递归直至满足小于1M的要求   commpressPicCycle(desPath, desFileSize, accuracy);  }

 commpressPicForScale(filePath, filePath, 500, 0.8);