<EditText 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/et_main_name" 
    android:hint="请输入用户名" 
    /> 
  <EditText 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/et_main_pwd" 
    android:hint="请输入用户名" 
    /> 
  <Button 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
    android:text="登录GET" 
    android:onClick="getdata" 
  /> 
  <Button 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="登录POST" 
    android:onClick="postdata" 
    /> 

public class MainActivity extends AppCompatActivity { 
 
  private EditText et_main_name; 
  private EditText et_main_pwd; 
  private HttpURLConnection httpURLConnection; 
  private URL url; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    et_main_name = (EditText) findViewById(R.id.et_main_name); 
    et_main_pwd = (EditText) findViewById(R.id.et_main_pwd); 
  } 
  //获取GET提交数据的点击事件 
  public void getdata(View view){ 
    String name=et_main_name.getText().toString(); 
    String pwds=et_main_pwd.getText().toString(); 
    String path="http://192.168.43.143:8080/login/login.xhtml"; 
    new myTask().execute(name,pwds,path,"GET"); 
 
  } 
  //写一个异步任务类继承AsyncTask，重写它的两个方法 
  class myTask extends AsyncTask{ 
    @Override 
    protected Object doInBackground(Object[] params) { 
      //获取参数的值 
      String name = params[0].toString(); 
      String pwds = params[1].toString(); 
      String path = params[2].toString(); 
      String type = params[3].toString(); 
      String s = "uname=" + name + "&pwd=" + pwds; 
 
      //判断提交数据的类型1、get 2、post 
      try { 
        if ("GET".equals(type)) {//用get方式提交 
          path = path + "?" + s; 
          url = new URL(path); 
          httpURLConnection = (HttpURLConnection) url.openConnection(); 
          httpURLConnection.setRequestMethod("GET"); 
        } else if ("POST".equals(type)) {//用post方式提交 
           
        } 
        httpURLConnection.setConnectTimeout(5000); 
      if (httpURLConnection.getResponseCode() == 200) { 
        InputStream inputStream = httpURLConnection.getInputStream(); 
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); 
        String result = bufferedReader.readLine(); 
        return result; 
      } 
    } catch (MalformedURLException e) { 
          e.printStackTrace(); 
      }catch (ProtocolException e) { 
        e.printStackTrace(); 
      } catch (IOException e) { 
        e.printStackTrace(); 
      } 
      return null; 
    } 
    @Override 
    protected void onPostExecute(Object o) { 
      String str= (String) o; 
      Toast.makeText(MainActivity.this,str,Toast.LENGTH_SHORT).show(); 
      super.onPostExecute(o); 
    } 
  } 
} 

public class MainActivity extends AppCompatActivity { 
 
  private EditText et_main_name; 
  private EditText et_main_pwd; 
  private HttpURLConnection httpURLConnection; 
  private URL url; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    et_main_name = (EditText) findViewById(R.id.et_main_name); 
    et_main_pwd = (EditText) findViewById(R.id.et_main_pwd); 
  } 
  
  //获取POST提交数据的点击事件 
  public void postdata(View view){ 
    String name=et_main_name.getText().toString(); 
    String pwds=et_main_pwd.getText().toString(); 
    String path="http://192.168.43.143:8080/login/login.xhtml"; 
    new myTask().execute(name,pwds,path,"POST"); 
 
  } 
   
  //写一个异步任务类继承AsyncTask，重写它的两个方法 
  class myTask extends AsyncTask{ 
    @Override 
    protected Object doInBackground(Object[] params) { 
      //获取参数的值 
      String name = params[0].toString(); 
      String pwds = params[1].toString(); 
      String path = params[2].toString(); 
      String type = params[3].toString(); 
      String s = "uname=" + name + "&pwd=" + pwds; 
 
      //判断提交数据的类型1、get 2、post 
      try { 
        if ("GET".equals(type)) {//用get方式提交 
          
        } else if ("POST".equals(type)) {//用post方式提交 
          url = new URL(path);//得到请求的路径 
          httpURLConnection = (HttpURLConnection) url.openConnection(); 
          //设置Content-Length Content-Type 
          httpURLConnection.setRequestProperty("Content-Length", s.length() + ""); 
          httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
          //设置允许对外输出数据 
          httpURLConnection.setDoOutput(true); 
          //将用户名密码以流的形式对外输出 
          httpURLConnection.getOutputStream().write(s.getBytes()); 
          httpURLConnection.setRequestMethod("POST");//数据提交的类型 
        } 
        httpURLConnection.setConnectTimeout(5000); 
      if (httpURLConnection.getResponseCode() == 200) {//判断响应码 
        InputStream inputStream = httpURLConnection.getInputStream(); 
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); 
        String result = bufferedReader.readLine(); 
        return result; 
      } 
    } catch (MalformedURLException e) { 
          e.printStackTrace(); 
      }catch (ProtocolException e) { 
        e.printStackTrace(); 
      } catch (IOException e) { 
        e.printStackTrace(); 
      } 
      return null; 
    } 
    @Override 
    protected void onPostExecute(Object o) { 
      String str= (String) o; 
      Toast.makeText(MainActivity.this,str,Toast.LENGTH_SHORT).show(); 
      super.onPostExecute(o); 
    } 
  } 
} 

<uses-permission android:name="android.permission.INTERNET" /> 

//设置Content-Length Content-Type 
httpURLConnection.setRequestProperty("Content-Length", s.length() + ""); 
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");