<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     tools:context="com.xh.tx.postget.MainActivity" >

   <EditText

       android:id="@+id/et_username"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:hint="请输入用户名"

       />

   <EditText

       android:id="@+id/et_password"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:layout_below="@id/et_username"

       android:hint="请输入密码"

       />

   <Button

       android:id="@+id/bt_get"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:layout_below="@id/et_password"

       android:text="GET提交"

       />

     <Button

       android:id="@+id/bt_post"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:layout_below="@id/bt_get"

       android:text="POST提交"

       />

 </RelativeLayout>

 package com.xh.tx.netUtils;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.OutputStream;

 import java.net.HttpURLConnection;

 import java.net.ProtocolException;

 import java.net.URL;

 import java.net.URLEncoder;

 public class NetUtils

 {

     public static String getSubmit(String username,String password,String uri)

     {

         uri = uri +"?username=" + username + "&password=" + password;

         HttpURLConnection conn =  getHttpURLConnection(uri);

         // http://localhost:8080/TestServlet?username=zs&password=123

         try {

             conn.setConnectTimeout(30000);

             conn.setReadTimeout(30000);

             conn.setRequestMethod("GET");

             conn.connect(); //连接 连接的时候是否要传递参数过去

             //先判断一下状态是否为200,如果为200则将in流转换为字符串

             if(conn.getResponseCode() == 200)

             {

                 String content = getStringFromInputStream(conn.getInputStream());

                 return content;

             }

         } catch (ProtocolException e) {

             e.printStackTrace();

         } catch (IOException e) {

             e.printStackTrace();

         }

         return null;

     }

     private static String getStringFromInputStream(InputStream inputStream) throws IOException

     {

         byte[] buffer = new byte[1024];

         ByteArrayOutputStream bytearray = new ByteArrayOutputStream();

         int len = 0;

         while((len = inputStream.read(buffer, 0, 1024)) != -1)

         {

             bytearray.write(buffer);

         }

     //    String content = new String(bytearray.toByteArray(),"GBK");

         return bytearray.toString();

     }

     public static String postSubmit(String username,String password, String uri)

     {

         HttpURLConnection conn =  getHttpURLConnection(uri);

         try {

             conn.setConnectTimeout(30000);

             conn.setReadTimeout(30000);

             conn.setRequestMethod("POST");

             //如果你要兼容2.3版本，那么你必须添加一下这句话

             conn.setDoInput(true);

             //参数传递

             OutputStream out = conn.getOutputStream();

             conn.connect();

             out.write(("username="+username + "&password=" + password).getBytes());

             if(conn.getResponseCode() == 200)

             {

                 String content = getStringFromInputStream(conn.getInputStream());

                 return content;

             }

         } catch (ProtocolException e) {

             e.printStackTrace();

         } catch (IOException e) {

             e.printStackTrace();

         }

         return null;

     }

     public static HttpURLConnection getHttpURLConnection(String uri)

     {

         try {

             URL url = new URL(uri);

             HttpURLConnection conn = (HttpURLConnection) url.openConnection();

             return conn;

         } catch (IOException e) {

             e.printStackTrace();

         }

         return null;

     }

 }

 package com.xh.tx.postget;

 import com.xh.tx.netUtils.NetUtils;

 import android.app.Activity;

 import android.os.Bundle;

 import android.view.Menu;

 import android.view.MenuItem;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.EditText;

 import android.widget.Toast;

 public class MainActivity extends Activity implements OnClickListener {

     EditText et_username;

     EditText et_password;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         et_username = (EditText) findViewById(R.id.et_username);

         et_password = (EditText) findViewById(R.id.et_password);

         findViewById(R.id.bt_get).setOnClickListener(this);

         findViewById(R.id.bt_post).setOnClickListener(this);

     }

     @Override

     public void onClick(View v)

     {

         final String username = et_username.getText().toString();

         final String password = et_password.getText().toString();

         switch (v.getId()) {

         case R.id.bt_get:

             new Thread(new Runnable()

             {

                 @Override

                 public void run()

                 {

                     final String status = NetUtils.getSubmit(username, password,"http://10.0.2.2:8080/baidu/LoginServelt");

                     runOnUiThread(new Runnable() {

                         @Override

                         public void run()

                         {

                             Toast.makeText(MainActivity.this, "返回的状态为:" + status, 0).show();

                         }

                     });

                 }

             }).start();

             break;

         case R.id.bt_post:

             new Thread(new Runnable()

             {

                 @Override

                 public void run()

                 {

                     final String status = NetUtils.postSubmit(username, password,"http://10.0.2.2:8080/baidu/LoginServelt");

                     runOnUiThread(new Runnable() {

                         @Override

                         public void run()

                         {

                             Toast.makeText(MainActivity.this, "返回的状态为:" + status, 0).show();

                         }

                     });

                 }

             }).start();

             break;

         default:

             break;

         }

     }

 }