Java如何实现缩略图和裁剪图制作？

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Java 缩略图，裁剪图，原图处理：javaBufferedImage src=ImageIO.read(new File(d:/a.jpg));int sw=src.getWidth();int sh=src.getHeight();

// 新的目标缩略图int w=100;int h=100; // 宽度固定，高度按比例缩放

// 裁剪原图到指定尺寸BufferedImage target=new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);Graphics2D g=target.createGraphics();g.drawImage(src, 0, 0, w, h, null);g.dispose();

// 原图 BufferedImage src = ImageIO.read(new File("d:/a.jpg")); int sw = src.getWidth(); int sh = src.getHeight(); // 新的目标缩略图 //指定尺寸 int w = 100; int h = 100; //宽度固定，高度按比例 w = 300; h = (int)(sh * ((float)w/sw)); BufferedImage dst = new BufferedImage(w, h, 1); Graphics2D g = (Graphics2D) dst.getGraphics(); g.drawImage(src, 0, 0, w, h, null); ImageIO.write(dst, "jpg", new File("d:/a_s.jpg")); //裁剪 public static void crop(String[] args) throws IOException { // 原图 BufferedImage src = ImageIO.read(new File("d:/o.jpg")); int sw = src.getWidth(); int sh = src.getHeight(); //裁剪新图片 int w = 150; int h = 150; BufferedImage dst = new BufferedImage(w, h, 1); Graphics2D g = (Graphics2D) dst.getGraphics(); int x = 300; int y = 180; int xx = x+w; int yy = y+h; g.drawImage(src,0,0,w,h,x,y,xx,yy,null); ImageIO.write(dst, "jpg", new File("d:/ooo.jpg")); }