概述：

基于Sun自带lib进行图片的操作，此处主要展示图片的缩放和图片剪裁

实现：

图片缩放：

/** * 图片伸缩，不破坏图片 *  * @param srcFile 原图片路径 * @param dstFile 目标图片路径 * @param dstWidth 目标宽度 * @param dstHeight 目标高度 * @date 2013-11-1 */public static void scale(String srcFile, String dstFile, int dstWidth, int dstHeight) {	try {		ImageInputStream iis = ImageIO.createImageInputStream(new File(srcFile));		Iterator
    
      iterator = ImageIO.getImageReaders(iis);		ImageReader reader = (ImageReader) iterator.next();		reader.setInput(iis, true);		BufferedImage source = reader.read(0);		BufferedImage tag = new BufferedImage(dstWidth, dstHeight, source.getType());		tag.getGraphics().drawImage(source, 0, 0, dstWidth, dstHeight, null);		File file = new File(dstFile);		ImageIO.write(tag, reader.getFormatName(), file);	} catch (Exception e) {		e.printStackTrace();	}}
    

图片剪裁：

/** * 图片剪裁，基于起始坐标(x,y)和范围[widthRange,heightRange] *  * @param srcFile 原图片路径 * @param dstFile 目标图片路径 * @param x 起始X * @param y 起始Y * @param widthRange 范围width * @param heightRange 范围height * @date 2013-11-1 */public static void cut(String srcFile, String dstFile, int x, int y, int widthRange,	int heightRange) {	try {		ImageInputStream iis = ImageIO.createImageInputStream(new File(srcFile));		Iterator
    
      iterator = ImageIO.getImageReaders(iis);		ImageReader reader = (ImageReader) iterator.next();		reader.setInput(iis, true);		ImageReadParam param = reader.getDefaultReadParam();		Rectangle rectangle = new Rectangle(x, y, widthRange, heightRange);		param.setSourceRegion(rectangle);		BufferedImage bi = reader.read(0, param);		File file = new File(dstFile);		ImageIO.write(bi, reader.getFormatName(), file);	} catch (Exception e) {		e.printStackTrace();	}}
    

测试：

public static void main(String[] args) {	String srcFile = "G:/1.jpg";	String dstFile = "G:/test.jpg";	int width = 120;	int height = 12000;	cut(srcFile, dstFile, 10, 10, width, height);	scale(srcFile, dstFile, width, height);}

评价：

效率很低