java实现切图并且判断图片是不是纯色/彩色图片

/**
   * 图片剪裁
   * @param x 距离左上角的x轴距离
   * @param y 距离左上角的y轴距离
   * @param width 宽度
   * @param height 高度
   * @param sourcePath 图片源
   * @param descpath 目标位置
   */
  public static void imageCut(int x, int y, int width, int height, String sourcePath, String descpath) { 
    FileInputStream is = null; 
    ImageInputStream iis = null; 
    try { 
      is = new FileInputStream(sourcePath); 
      String fileSuffix = sourcePath.substring(sourcePath.lastIndexOf(".") + 1); 
      Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(fileSuffix); 
      ImageReader reader = it.next(); 
      iis = ImageIO.createImageInputStream(is); 
      reader.setInput(iis, true); 
      ImageReadParam param = reader.getDefaultReadParam(); 
      Rectangle rect = new Rectangle(x, y, width, height); 
      param.setSourceRegion(rect); 
      BufferedImage bi = reader.read(0, param); 
      ImageIO.write(bi, fileSuffix, new File(descpath)); 
    } catch (Exception ex) { 
      ex.printStackTrace(); 
    } finally { 
      if (is != null) { 
        try { 
          is.close(); 
        } catch (IOException e) { 
          e.printStackTrace(); 
        } 
        is = null; 
      } 
      if (iis != null) { 
        try { 
          iis.close(); 
        } catch (IOException e) { 
          e.printStackTrace(); 
        } 
        iis = null; 
      } 
    } 
  }

/**
   * 判断是否为纯色
   * @param imgPath 图片源
   * @param percent 纯色百分比，即大于此百分比为同一种颜色则判定为纯色,范围[0-1]
   * @return
   * @throws IOException
   */
  public static boolean isSimpleColorImg(String imgPath,float percent) throws IOException{
    BufferedImage src=ImageIO.read(new File(imgPath));
    int height=src.getHeight();
    int width=src.getWidth();
    int count=0,pixTemp=0,pixel=0;
    for(int i=0;i<width;i++){
      for(int j=0;j<height;j++){
        pixel=src.getRGB(i, j);
        if(pixel==pixTemp) //如果上一个像素点和这个像素点颜色一样的话，就判定为同一种颜色
          count++;
        else
          count=0;
        if((float)count/(height*width)>=percent) //如果连续相同的像素点大于设定的百分比的话，就判定为是纯色的图片 
          return true;
        pixTemp=pixel;
      }
    }
    return false;
  }