设置ip代理

http代理：

 获取当前ip->System.getProperties().getProperty("http.proxyHost");

获取当前使用端口--> System.getProperties().getProperty("http.proxyPort");

设置ip-->System.getProperties().setProperty("http.proxyHost", "112.95.205.28");

设置端口-->System.getProperties().setProperty("http.proxyPort", "8888");

socks代理：

    String proxyHost = "20.0.1.216";
//    int proxyPort = 8788;
//    URL url = new URL("https://openapi.alipay.com");
//    HttpURLConnection conn = null;
//    Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
//    HttpsURLConnection connHttps = (HttpsURLConnection) url.openConnection(proxy);
//    if ("https".equals(url.getProtocol())) {
//       conn = connHttps;
//    } else {
//       conn = (HttpURLConnection) url.openConnection(proxy);
//    }
//    conn.connect();
//    int  state = conn.getResponseCode();
//    System.out.println(state);