package jtest;import java.awt.Graphics;import java.awt.Image;import java.awt.Toolkit;import java.awt.image.BufferedImage;import java.awt.image.CropImageFilter;import java.awt.image.FilteredImageSource;import java.awt.image.ImageFilter;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;/*** @author anquan* @desc: 根据图片URL裁切并生成缩略图* @date 2015-3-21 下午7:16:37*/public class CopyOfImgTest {/*** 根据图片URL裁切并生成缩略图* @param imgUrl 上传的图片的URL* @param destDir 存放目录* @param width 图片宽* @param height 图片高* @throws IOException*/public void resizeImage(String imgUrl, String destDir, Integer width, Integer height) throws IOException {HttpURLConnection httpUrl = null;InputStream fis = null;FileOutputStream fos = null;URL url = null;try {url = new URL(imgUrl);httpUrl = (HttpURLConnection) url.openConnection();httpUrl.connect();fis = httpUrl.getInputStream();BufferedImage bi = ImageIO.read(fis);int src_w = bi.getWidth();int src_h = bi.getHeight();if (width == null || width <= 0 ) {width = src_w;}if (height == null || height <= 0) {height = src_h;}//(1)图片长大于宽,去掉长的左右两边//(2)图片长小于宽,去掉宽上面的三分之一，去掉宽下面的三分之二int top = 0;//左int left = 0;//左if(src_w > src_h){left = (src_w – src_h)/2;src_w = src_h;}else{top = (src_h – src_w)/3;src_h = src_w;}// 裁切图片ImageFilter cropFilter = new CropImageFilter(left, top, src_w, src_h);Image cutImage = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(bi.getSource(), cropFilter));Image image_s = cutImage.getScaledInstance(width, height,Image.SCALE_DEFAULT);//获取缩放后的图片大小//图片缩小处理BufferedImage tag_s = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics g_s = tag_s.getGraphics();g_s.drawImage(image_s, 0, 0, null); // 绘制缩小后的图g_s.dispose();// 输出为文件fos = new FileOutputStream(destDir);JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);encoder.encode(tag_s);} catch (Exception e) {e.printStackTrace();}finally{fos.flush();fis.close();fos.close();}}public static void main(String[] args) {CopyOfImgTest dw = new CopyOfImgTest();String destUrl1 = ":8080/wedding/resources/upload/ushop/1//album//20150321230218658.jpg";String destUrl2 = ":8080/wedding/resources/upload/ushop/1//album//20150315002308968.jpg";try {dw.resizeImage(destUrl1, "f://b1.gif", 300, 300);dw.resizeImage(destUrl2, "f://b2.gif", 300, 300);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
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