java实现的图片裁剪功能示例

package Tsets;import java.awt.Rectangle;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.util.Iterator;import javax.imageio.ImageIO;import javax.imageio.ImageReadParam;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;public class PicCut {  public void cut(int x,int y,int width,int height,String srcpath,String subpath) throws IOException {//裁剪方法    FileInputStream is = null;    ImageInputStream iis = null;    try {      is = new FileInputStream(srcpath); //读取原始图片      Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("jpg"); //ImageReader声称能够解码指定格式      ImageReader reader = it.next();      iis = ImageIO.createImageInputStream(is); //获取图片流      reader.setInput(iis, true); //将iis标记为true（只向前搜索）意味着包含在输入源中的图像将只按顺序读取      ImageReadParam param = reader.getDefaultReadParam(); //指定如何在输入时从 Java Image I/O框架的上下文中的流转换一幅图像或一组图像      Rectangle rect = new Rectangle(x, y, width, height); //定义空间中的一个区域      param.setSourceRegion(rect); //提供一个 BufferedImage，将其用作解码像素数据的目标。      BufferedImage bi = reader.read(0, param); //读取索引imageIndex指定的对象      ImageIO.write(bi, "jpg", new File(subpath)); //保存新图片    } finally {      if (is != null)        is.close();      if (iis != null)        iis.close();    }  }  public static void main(String[] args) throws Exception {      PicCut pc = new PicCut();    pc.cut(20, 20, 100, 100,"D://1.jpg","D://11.jpg");    System.out.println("ok");  }}