1  new Thread(){
 2             @Override
 3             public void run() {
 4                 try {
 5                     //1.有了网络地址，得到URL
 6                     String urlPath = "http://192.168.35.10:8080/login/login?username=" + username + "&pwd=" + pwd;
 7                     URL url = new URL(urlPath);
 8                     //2.打开Http连接
 9                     HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
10                     //3.设置请求方式
11                     conn.setRequestMethod("GET");
12                     //4.判断响应码
13                     if(conn.getResponseCode() == 200){
14                         //5.读取输入流
15                         InputStream is = conn.getInputStream();
16                         BufferedReader reader = new BufferedReader(new InputStreamReader(is));
17                         final String result = reader.readLine();
18                         runOnUiThread(new Runnable() {
19                             @Override
20                             public void run() {
21                                 Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();
22                             }
23                         });
24                     }
25                 } catch (Exception e) {
26                     e.printStackTrace();
27                 }
28             }
29         }.start();

 _______________________________________________________________________________________________________________

new Thread(){
            @Override
            public void run() {
                try {
                    //1.有了网络地址，得到URL
                    String urlPath = "http://192.168.35.10:8080/loginPost/login";
                    URL url = new URL(urlPath);
                    //2.打开Http连接
                    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
                    //3.设置请求方式
                    conn.setRequestMethod("POST");
                    //这里有两个请求头
                    //1.告诉服务器 我们是一个form表单
                    //计算参数的字符串的长度
                    String params = "username=" + username + "&pwd=" + pwd;
                    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                    conn.setRequestProperty("Content-Length", params.length() + "");

                    //********向服务器提交数据OutputStream********
                    //安卓下HtttpURLConnection的输出流开关默认是关闭的
                    conn.setDoOutput(true);
                    conn.getOutputStream().write(params.getBytes());
                    //****************

                    //4.判断响应码
                    if(conn.getResponseCode() == 200){
                        //5.读取输入流
                        InputStream is = conn.getInputStream();
                        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                        final String result = reader.readLine();
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();
                            }
                        });
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }.start();