通过 URL类获取带密码验证资源文件的处理方法

package com.test;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;

public class Test{

 /**
  * @param args
  */
 public static void main(String[] args) {

  String imageurl="http://www.baidu.com/img/logo-yy.gif";
  URL url;
  
  String theUsername="test";
  String thePassword="test";
  
  try {
   url = new URL (imageurl);
   
   String userPassword = theUsername + ":" + thePassword;
   String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());
   
   //实际上URL的openConnection的返回值就是一个URLConnection
      URLConnection c;
   try {
    c = url.openConnection();
    c.setRequestProperty ("Authorization", "Basic " + encoding);
    
       //用URLConnection的connect()方法建立连接
       c.connect();                            //*
       // 显示该连接的相关信息，这些都是URLConnection的方法
       System.out.println("内容类型: "+c.getContentType());
       System.out.println("内容长度: "+c.getContentLength());
       System.out.println("创建日期: "+new Date(c.getDate()));
       System.out.println("最后修改日期: "+new Date(c.getLastModified()));
       System.out.println("终止日期: "+new Date(c.getExpiration()));
      
       InputStream in=c.getInputStream();
      
    String pathName = saveTempFile(in,"test.jpg");
    System.out.println(pathName);
    
    
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } //*
  
   
   
   
   
  } catch (MalformedURLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }
 
 private static String saveTempFile(InputStream inputStream,String fllename) {
  String pathName = getTempFileName(fllename);  
  File tmpFile = new File(pathName);
  OutputStream out = null;
  try {
   out = new BufferedOutputStream(new FileOutputStream(tmpFile));

   int length = 1024 * 1024;

   byte[] buffer = new byte[length];

   while ((length = inputStream.read(buffer)) > 0) {
    out.write(buffer, 0, length);
   }
  } catch (Exception e) {
   e.printStackTrace();
   //Global.logger.error("save temp file exception!");
  } finally {
   ResourceMgr.closeQuietly(out);
  }
  return pathName;
 }
 
 private static String getTempFileName(String filename) {
  //return System.getProperty("user.dir")+ File.separator+System.currentTimeMillis() + ".gif";
  return System.getProperty("user.dir")+ File.separator + filename;
 }

}

注意 关键：

   String userPassword = theUsername + ":" + thePassword;
   String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());

    c.setRequestProperty ("Authorization", "Basic " + encoding);