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) 21  * @description
 * @time  2013-2-24下午02:07:00 24  * @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);
        }

    }
}