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;  }