Java代码实现图片压缩上传

package com.winskysoft.controller;

import java.awt.Image;  
import java.awt.image.BufferedImage;  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import javax.imageio.ImageIO;  
import com.sun.image.codec.jpeg.JPEGCodec;  
import com.sun.image.codec.jpeg.JPEGImageEncoder;  
  
/******************************************************************************* 
 * 缩略图类（通用） 本java类能将jpg、bmp、png、gif图片文件，进行等比或非等比的大小转换。 具体使用方法 
 * compressPic(大图片路径,生成小图片路径,大图片文件名,生成小图片文名,生成小图片宽度,生成小图片高度,是否等比缩放(默认为true)) 
 */  
 public class Ceshi {   
     private File file = null; // 文件对象   
     private String inputDir; // 输入图路径  
     private String outputDir; // 输出图路径  
     private String inputFileName; // 输入图文件名  
     private String outputFileName; // 输出图文件名  
     private int outputWidth = 100; // 默认输出图片宽  
     private int outputHeight = 100; // 默认输出图片高  
     private boolean proportion = true; // 是否等比缩放标记(默认为等比缩放)  
     public Ceshi() { // 初始化变量  
         inputDir = "";   
         outputDir = "";   
         inputFileName = "";   
         outputFileName = "";   
         outputWidth = 100;   

         outputHeight = 100;   
     }   
     public void setInputDir(String inputDir) {   
         this.inputDir = inputDir;   
     }   
     public void setOutputDir(String outputDir) {   
         this.outputDir = outputDir;   
     }   
     public void setInputFileName(String inputFileName) {   
         this.inputFileName = inputFileName;  
     }   
     public void setOutputFileName(String outputFileName) {   
         this.outputFileName = outputFileName;   
     }   
     public void setOutputWidth(int outputWidth) {  
         this.outputWidth = outputWidth;   
     }   
     public void setOutputHeight(int outputHeight) {   
         this.outputHeight = outputHeight;   
     }   
     public void setWidthAndHeight(int width, int height) {   
         this.outputWidth = width;  
         this.outputHeight = height;   
     }   
       
     /*  
      * 获得图片大小  
      * 传入参数 String path ：图片路径  
      */   
     public long getPicSize(String path) {