图片的切割和缩略
package com.supben.util;import java.awt.Dimension;import java.awt.Image;import java.awt.Point;import java.awt.Rectangle;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;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;import org.apache.log4j.Logger;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class ImageUtil {private static final Logger log = Logger.getLogger(ImageUtil.class);/** * 切割图片 * @param x 截点横坐标 (从左开始计数) * @param y 截点纵坐标 (从上开始计数) * @param width 截取的宽度 * @param height 截取的长度 * @param oldpath 图片位置 * @param newpath 新生成的图片位置 */public static void cutImage(int x, int y, int width, int height, String oldpath, String newpath) {FileInputStream is = null;ImageInputStream iis = null;//这个是获取图片扩展名的方法，比如：jpg。我这里有现成的，如果没有，自己实现String imgType = StringUtil.getExt(oldpath);try {is = new FileInputStream(oldpath);Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(imgType);ImageReader reader = it.next();iis = ImageIO.createImageInputStream(is);reader.setInput(iis, true);ImageReadParam param = reader.getDefaultReadParam();Point p = new Point();p.setLocation(x, y);Dimension d = new Dimension();d.setSize(width, height);Rectangle rect = new Rectangle(p, d);param.setSourceRegion(rect);BufferedImage bi = reader.read(0, param);ImageIO.write(bi, imgType, new File(newpath));is.close();iis.close();} catch (Exception e) {log.error(e);}}/** * 缩略图片 * @param oldpath 原图片 * @param newpath 新生成的图片存放地址 * @param wdith 缩略后的宽 * @param height缩略后的高 */public static void scaleImage(String oldpath, String newpath, int wdith, int height) {// 获取老的图片File oldimg = new File(oldpath);try {BufferedImage bi = ImageIO.read(oldimg);Image Itemp = bi.getScaledInstance(wdith, height, BufferedImage.SCALE_SMOOTH);BufferedImage thumbnail = new BufferedImage(wdith, height, BufferedImage.TYPE_INT_RGB);thumbnail.getGraphics().drawImage(Itemp, 0, 0, null);// 缩略后的图片路径File newimg = new File(newpath);FileOutputStream out = new FileOutputStream(newimg);// 绘图JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbnail);param.setQuality(1.0f, false);encoder.encode(thumbnail);out.close();bi.flush();bi = null;} catch (IOException e) {log.error(e);}}public static void main(String[] args) {scaleImage("D:/2.jpg", "D:/3.jpg", 50, 50);}}
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