package util;import java.awt.Rectangle;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.util.Iterator;import javax.imageio.ImageIO;import javax.imageio.ImageReadParam;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;public class ImgCut {  public void readUsingImageReader(String src, String dest, int w, int h)   throws Exception {  // 取得图片读入器  Iterator readers = ImageIO.getImageReadersByFormatName("jpg");  ImageReader reader = (ImageReader) readers.next();  // 取得图片读入流  InputStream source = new FileInputStream(src);  ImageInputStream iis = ImageIO.createImageInputStream(source);  reader.setInput(iis, true);  // 图片参数  ImageReadParam param = reader.getDefaultReadParam();  // 100，200是左上起始位置，300就是取宽度为300的，就是从100开始取300宽，就是横向100~400，同理纵向200~350的区域就取高度150  // Rectangle rect = new Rectangle(100, 200, 300, 150);//  int hh = 0;  if (h > 100)  hh = (h - 100) / 3;  Rectangle rect = new Rectangle(0, hh, 227, 100);  param.setSourceRegion(rect);  BufferedImage bi = reader.read(0, param);  ImageIO.write(bi, "jpg", new File(dest)); } public static void main(String[] args) throws Exception { // main方法测试用  ImgCut t = new ImgCut();  t.readUsingImageReader("d://2.jpg", "d://3.jpg", 227, 163); }}