用Java程序如何穿透带有密码验证的代理

java sample codes that access outer internet through proxy which require username and password

use inner instead of extends is the most different

网上也有一些文章但是大多数涉及带有授权验证的proxy都有问题，主要问题就是出在对 Authenticator.setDefault的使用，以及base64编码的问题上代码是最没有二义性的文档，实现原理不再解释，请看代码去体会。

  
   [email protected]
   

   
package org.chimae.net;
   

   
import java.io.BufferedReader;
   
import java.io.IOException;
   
import java.io.InputStream;
   
import java.io.InputStreamReader;
   
import java.net.Authenticator;
   
import java.net.HttpURLConnection;
   
import java.net.PasswordAuthentication;
   
import java.net.URL;
   

   
/**
   
* @author [email protected]
   
*/
   
public class ProxyConnTest {
   
public static void initProxy(String host, int port, final String username,
   
final String password) {
   
Authenticator.setDefault(new Authenticator() {
   
protected PasswordAuthentication getPasswordAuthentication() {
   
return new PasswordAuthentication(username,
   
new String(password).toCharArray());
   
}
   
});
   

   
System.setProperty(/”http.proxyType/”, /”4/”);
   
System.setProperty(/”http.proxyPort/”, Integer.toString(port));
   
System.setProperty(/”http.proxyHost/”, host);
   
System.setProperty(/”http.proxySet/”, /”true/”);
   
}
   
public static void main(String[] args) throws IOException {
   
String url = /”http://java.sun.com//”;
   
String proxy = /”yourProxy/”;
   
int port =8080;
   
String username =/”username/”;
   
String password =/”password/”;
   
String curLine = /”/”;
   
String content = /”/”; 
   
URL server = new URL(url);
   
initProxy(proxy,port,username,password);
   
HttpURLConnection connection = (HttpURLConnection)server.openConnection();
   
connection.connect();
   
InputStream is = connection.getInputStream();
   
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
   
while ((curLine = reader.readLine()) != null) {
   
content += curLine;
   
}
   

   
System.out.println(/”content= /” + content);
   
is.close();
   
}
   

   
}