package com.proj.net; //導入編碼的jar文件 import it.sauronsoftware.base64.Base64; import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; /** * 很多公司會對網上進行限制，要通過代理http://www.vxbq.cn/server/和口令才能連接外網。<br> * 這類方式有很多好處：<br> * 1、安全，代理http://www.vxbq.cn/server/像1層過濾層；<br> * 2、節省本錢，只需要分配很少的IP地址便可；<br> * 3、對員工上網可以個性化配置，避免有人下載大量數據而造成網絡擁堵不堪。<br> * * 本文通過1個小案例來介紹如何在程序里跨過局域網訪問外網。<br> * 對弄網絡開發的人來講，不值1提；但對做JAVA EE利用開發的人來講，可以參考。<br> * * @author 王1洋 * * 2014⑴0⑶0 * */ public class Test { public static void main(String[] args) { try { //兩種方式設置代理http://www.vxbq.cn/server/ //設置代理1 //Proxy proxy = new Proxy(Proxy.Type.HTTP,new InetSocketAddress("", 80)); //設置代理2 System.getProperties().setProperty( "http.proxyHost", ""); System.getProperties().setProperty( "http.proxyPort", "" ); String urlString = "http://blog.csdn.net/"; URL url = new URL(urlString); //對應第1種設置方式 //HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(proxy); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setRequestMethod("GET"); urlConnection.setConnectTimeout(1000); //設置User Agent urlConnection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); //設置訪問的用戶名和密碼 urlConnection.setRequestProperty( "Proxy-Authorization", "Basic" + Base64.encode("username:password") ); urlConnection.connect(); System.out.print(urlConnection.getResponseCode()); BufferedInputStream bis = new BufferedInputStream(urlConnection.getInputStream()); InputStreamReader isr = new InputStreamReader(bis,"UTF⑻"); BufferedReader bufferedReader = new BufferedReader(isr); String str = ""; StringBuffer buffer = new StringBuffer(""); while((str = bufferedReader.readLine())!=null){ buffer.append(str+" "); } System.out.println(buffer); } catch (Exception e) { e.printStackTrace(); } } }