java版图片压缩方法

package com.cnblogs.zxub.util.framework.common;  

    

 import java.awt.Color;  

 import java.awt.Graphics2D;  

 import java.awt.Image;  

 import java.awt.image.BufferedImage;  

 import java.awt.image.ConvolveOp;  

 import java.awt.image.Kernel;  

 import java.io.File;  

 import java.io.FileOutputStream;  

 import java.io.InputStream;  

    

 import org.apache.commons.fileupload.FileItem;  

 import org.apache.log4j.Logger;      

 import com.sun.image.codec.jpeg.JPEGCodec;