JAVA HTTP连接（HttpURLConnection）中使用代理（Proxy）及其验证(Authentication)

public static void main(String[] args) {
// TODO Auto-generated method stub
try {
URL url = new URL("http://www.baidu.com");
// 创建代理服务器
InetSocketAddress addr = new InetSocketAddress("172.21.1.8",80);
Proxy proxy = new Proxy(Proxy.Type.HTTP, addr); // http 代理
URLConnection conn = url.openConnection(proxy);

//以下三行是在需要验证时，输入帐号密码信息
String headerkey = "Proxy-Authorization";
String headerValue = "Basic "+Base64.encodeToString("atco:atco".getBytes(), false); //帐号密码用:隔开，base64加密方式
conn.setRequestProperty(headerkey, headerValue);

InputStream in = conn.getInputStream();
// InputStream in = url.openStream();
String s = IOUtils.toString(in, "utf-8");
System.out.println(s);
} catch (Exception e) {
e.printStackTrace();
}
}