java对图片的裁剪（包括来自网络的图片）

 import java.awt.Rectangle;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.Iterator;
 import java.util.Random;

 import javax.imageio.ImageIO;
 import javax.imageio.ImageReadParam;
 import javax.imageio.ImageReader;
 import javax.imageio.stream.ImageInputStream;

 /**
  * 剪裁图片(从网络上获取图片)  * @description
  * @time  2013-2-24下午02:07:00  * @version
  */
 public class CutImageUtil {

     private static final String DESTIMAGEPATH = "e://";
     private static final String BASE_IMAGE_URL="http://pimages3.tianjimedia.com/resources/product/";
     /**剪切点X坐标*/
     private static int x=16;
     /**剪切点Y坐标*/
     private static int y=22;
     /**剪切点宽度*/
     private static int width=784;
     /**剪切点高度*/
     private static int height=560;

     /**
      *
      * @Description: 剪切网络图片
      * String
      */
     public static String cutFromUrl(String imageUrl) {
         String suffix=imageUrl.substring(imageUrl.lastIndexOf("."));
         String fileName="";
         String fileNameAndPath="";
         InputStream is = null;
         ImageInputStream iis = null;
         String result=null;
         try {
             /**读取图片*/
             Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("jpg");
             ImageReader reader = it.next();
             /**获取图片流*/
             URL url = new URL(imageUrl);
             HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
             /**设置请求方式为"GET"*/
             httpConn.setRequestMethod("GET");
             /**超时响应时间为5秒*/
             httpConn.setConnectTimeout(5 * 1000);
             httpConn.connect();
             is = httpConn.getInputStream();

             iis = ImageIO.createImageInputStream(is);
             reader.setInput(iis, true);

             ImageReadParam param = reader.getDefaultReadParam();
             Rectangle rect = new Rectangle(x, y, width, height);
             param.setSourceRegion(rect);
             BufferedImage bi = reader.read(0, param);

             fileName=GlobalMethodUtil.createFileName(suffix);
             fileNameAndPath=GlobalMethodUtil.createDir("/home/tmp/resources/product/")+fileName;
             if(fileNameAndPath==null||fileNameAndPath.equals("")){
                 result="";
             }else{
                 result=BASE_IMAGE_URL+fileNameAndPath.substring(fileNameAndPath.indexOf("product/")+8);
             }
             ImageIO.write(bi, "jpg", new File(fileNameAndPath));
         } catch (Exception ex) {
             ex.printStackTrace();
         } finally {
             try {
                 if (is != null) {
                     is.close();
                 }
                 if (iis != null) {
                     iis.close();
                 }
             } catch (Exception ex) {
                 ex.printStackTrace();
             }
         }
         return result;
     }

     /**
      *
      * @Description: 剪切本地图片
      *  @param imagePath
      * String
      */
     public static String cutLocalImage(String imagePath) {
         String fileName="";
         String fileNameAndPath="";
         FileInputStream fis = null;
         ImageInputStream iis = null;
         try {
             /**读取图片*/
             Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("jpg");
             ImageReader reader = it.next();
             /**获取图片流*/
             fis = new FileInputStream(imagePath);
             iis = ImageIO.createImageInputStream(fis);
             reader.setInput(iis, true);

             ImageReadParam param = reader.getDefaultReadParam();
             Rectangle rect = new Rectangle(x, y, width, height);
             param.setSourceRegion(rect);
             BufferedImage bi = reader.read(0, param);

             fileName=GlobalMethodUtil.createFileName("jpg");
             fileNameAndPath=GlobalMethodUtil.createDir("/home/tmp/qicheInfo/resources/product/")+fileName;
             ImageIO.write(bi, "jpg", new File(DESTIMAGEPATH + new Date().getTime() + "." + "jpg"));
         } catch (Exception ex) {
             ex.printStackTrace();
         } finally {
             try {
                 if (fis != null) {
                     fis.close();
                 }
                 if (iis != null) {
                     iis.close();
                 }
             } catch (Exception ex) {
                 ex.printStackTrace();
             }
         }
         return BASE_IMAGE_URL+fileNameAndPath.substring(fileNameAndPath.indexOf("product/")+8);
     }

     private static class GlobalMethodUtil {

         /**
          * 返回文件名(file)
          * @Description:
          * @return
          */
         public static String createFileName(String suffix) {
             /**结合目录和文件名 生成唯一标识符*/
             Calendar c = Calendar.getInstance();
             /**利用小时分钟毫秒和源文件的文件名生成新文件名+文件后缀*/
             String name = c.get(Calendar.HOUR) + "" + c.get(Calendar.MINUTE) + "" + c.get(Calendar.SECOND)
                     + c.get(Calendar.MILLISECOND) + randStr()
                     + suffix;
             return name;
         }

         /**
          * 利用26个字母生成随机字母组合
          * @Description:
          * @return
          */
         public static String randStr() {
             String[] rands = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "k", "o", "p", "q",
                     "r", "s", "t", "u", "v", "w", "x", "y", "z"};
             String randstr = "";
             /**生成8个随机字母组合*/
             for (int i = 0; i < 8; i++) {
                 randstr += rands[new Random().nextInt(26)];
             }
             return randstr;
         }

         /**
          * 创建文件目录
          * @Description:
          * @return 文件目录路径
          */
         public static String createDir(String path) {
             Calendar c = Calendar.getInstance();
             String dir = path;
             dir += c.get(Calendar.YEAR) + "" + ((c.get(Calendar.MONTH) + 1)<10?"0"+(c.get(Calendar.MONTH) + 1):(c.get(Calendar.MONTH) + 1)) + "" + (c.get(Calendar.DATE)<10?"0"+c.get(Calendar.DATE):c.get(Calendar.DATE)) + "/";
             File tempDir = new File(dir);
             /**判断文件路径是否存在*/
             if (!tempDir.exists()) {
                 /**不存在就创建文件目录*/
                 tempDir.mkdirs();
             }
             return dir;
         }

         /**
          *
          * @Description: 获取分页的总页数
          *  @param count 数据总量
          *  @param size 每页分页数量
          *  @return
          * int
          */
         public static int getPageSize(int count,int size){
             return count%size!=0?(count/size+1):(count/size);
         }

     }
 }