关于JPEGImageEncoder的有关问题

关于JPEGImageEncoder的问题
我在网上下载了如下代码,在myeclipse中运行时,它提示如下错误:

Access restriction: The type JPEGImageEncoder is not accessible due to restriction on required library C:\Java\jre1.6.0_07\lib\rt.jar
Access restriction: The type JPEGCodec is not accessible due to restriction on required library C:\Java\jre1.6.0_07\lib\rt.jar
Access restriction: The method createJPEGEncoder(OutputStream) from the type JPEGCodec is not accessible due to restriction on required library C:\Java\jre1.6.0_07\lib\rt.jar
Access restriction: The method encode(BufferedImage) from the type JPEGImageEncoder is not accessible due to restriction on required library C:\Java\jre1.6.0_07\lib\rt.jar

但C:\Java\jre1.6.0_07\lib\rt.jar是存在的啊,麻烦哪位给你指明一下?


//缩略图实现，将图片(jpg,gif,bmp等等)真实的变成想要的大小  
import java.io.*;  
import java.util.*;  
import com.sun.image.codec.jpeg.*;  
import java.awt.image.*;  
import java.awt.*;  
import java.net.*;  
import java.applet.*;  
import java.sql.*;  
//缩略图类，  
//本java类能将jpg图片文件，进行等比或非等比的大小转换。  
//具体使用方法  
//s_pic(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 thumbs{  
  String InputDir; //输入图路径  
  String OutputDir; //输出图路径  
  String InputFileName; //输入图文件名  
  String OutputFileName; //输出图文件名  
  int OutputWidth = 80; //默认输出图片宽  
  int OutputHeight = 80; //默认输出图片高  
  int rate = 0;  
  boolean proportion = true; //是否等比缩放标记(默认为等比缩放)  
   
  public thumbs() {  
  //初始化变量  
  InputDir = "";  
  OutputDir = "";  
  InputFileName = "";  
  OutputFileName = "";  
  OutputWidth = 80;  
  OutputHeight = 80;  
  rate = 0;  
  }  
   
  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 setW_H(int width, int height) {  
  this.OutputWidth = width;  
  this.OutputHeight = height;  
  }  
   
  public String s_pic() {  
  BufferedImage image;  
  String NewFileName;  
//建立输出文件对象  
  File file = new File(OutputDir + OutputFileName);  
  FileOutputStream tempout = null;  
  try {  
  tempout = new FileOutputStream(file);  
  }  
  catch (Exception ex) {  
  System.out.println(ex.toString());  
  }  
  Image img = null;  
  Toolkit tk = Toolkit.getDefaultToolkit();