HttpURLConnection设置代理服务器

1、设置系统数据

java  -Dhttp.proxyHost=proxy.com  -Dhttp.proxyPort=80 MyJavaApp

或者

System.setProperty("http.proxyHost", "proxy.com");
System.setProperty("http.proxyPort", "80");

其他可设置的属性
http://docs.oracle.com/javase/6/docs/technotes/guides/net/properties.html

从1.5起可以通过Proxy类来打开链接

Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("176.93.133.144", 8080));
URL url = new URL("http://www.google.com.hk");
HttpURLConnection uc = (HttpURLConnection)url.openConnection(proxy);
uc.connect();

设置代理服务器的用户名和密码

System.setProperty("http.proxyHost", "proxy.com");
System.setProperty("http.proxyPort", "80");
URL url=new URL("http://someserver/somepage");
URLConnection uc = url.openConnection ();
String encoded = new String
      (Base64.base64Encode(new String("username:password").getBytes()));
uc.setRequestProperty("Proxy-Authorization", "Basic " + encoded);
uc.connect();