Android与服务器http连接模块代码

 package com.example.httpdemo2;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
 import java.util.List;

 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.NameValuePair;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.entity.UrlEncodedFormEntity;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.message.BasicNameValuePair;

 import android.os.Bundle;
 import android.app.Activity;
 import android.util.Log;
 import android.view.Menu;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;

 public class HttpDemo2Activity extends Activity
 {
     private String TAG = "http";
     private EditText mNameText = null;
     private EditText mAgeText = null;

     private Button getButton = null;
     private Button postButton = null;

     private TextView mResult = null;

     // 基本地址：服务器ip地址：端口号/Web项目逻辑地址+目标页面（Servlet）的url-pattern
     private String baseURL = "http://192.168.11.6:8080/HelloWeb/servlet/WelcomeUserServlet";

     @Override
     protected void onCreate(Bundle savedInstanceState)
     {
         Log.i(TAG, "onCreate");
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_http_demo2);

         mNameText = (EditText) findViewById(R.id.name);
         mAgeText = (EditText) findViewById(R.id.age);
         mResult = (TextView) findViewById(R.id.result);

         getButton = (Button) findViewById(R.id.submit_get);
         getButton.setOnClickListener(mGetClickListener);
         postButton = (Button) findViewById(R.id.submit_post);
         postButton.setOnClickListener(mPostClickListener);
     }

     private OnClickListener mGetClickListener = new View.OnClickListener()
     {

         @Override
         public void onClick(View v)
         {
             Log.i(TAG, "GET request");
             // 先获取用户名和年龄
             String name = mNameText.getText().toString();
             String age = mAgeText.getText().toString();

             // 使用GET方法发送请求,需要把参数加在URL后面，用？连接，参数之间用&分隔
             String url = baseURL + "?username=" + name + "&age=" + age;

             // 生成请求对象
             HttpGet httpGet = new HttpGet(url);
             HttpClient httpClient = new DefaultHttpClient();

             // 发送请求
             try
             {

                 HttpResponse response = httpClient.execute(httpGet);

                 // 显示响应
                 showResponseResult(response);// 一个私有方法，将响应结果显示出来

             }
             catch (Exception e)
             {
                 e.printStackTrace();
             }

         }
     };

     private OnClickListener mPostClickListener = new View.OnClickListener()
     {

         @Override
         public void onClick(View v)
         {
             Log.i(TAG, "POST request");
             // 先获取用户名和年龄
             String name = mNameText.getText().toString();
             String age = mAgeText.getText().toString();

             NameValuePair pair1 = new BasicNameValuePair("username", name);
             NameValuePair pair2 = new BasicNameValuePair("age", age);

             List<NameValuePair> pairList = new ArrayList<NameValuePair>();
             pairList.add(pair1);
             pairList.add(pair2);

             try
             {
                 HttpEntity requestHttpEntity = new UrlEncodedFormEntity(
                         pairList);
                 // URL使用基本URL即可，其中不需要加参数
                 HttpPost httpPost = new HttpPost(baseURL);
                 // 将请求体内容加入请求中
                 httpPost.setEntity(requestHttpEntity);
                 // 需要客户端对象来发送请求
                 HttpClient httpClient = new DefaultHttpClient();
                 // 发送请求
                 HttpResponse response = httpClient.execute(httpPost);
                 // 显示响应
                 showResponseResult(response);
             }
             catch (Exception e)
             {
                 e.printStackTrace();
             }

         }
     };

     /**
      * 显示响应结果到命令行和TextView
      * @param response
      */
     private void showResponseResult(HttpResponse response)
     {
         if (null == response)
         {
             return;
         }

         HttpEntity httpEntity = response.getEntity();
         try
         {
             InputStream inputStream = httpEntity.getContent();
             BufferedReader reader = new BufferedReader(new InputStreamReader(
                     inputStream));
             String result = "";
             String line = "";
             while (null != (line = reader.readLine()))
             {
                 result += line;

             }

             System.out.println(result);
             mResult.setText("Response Content from server: " + result);
         }
         catch (Exception e)
         {
             e.printStackTrace();
         }

     }

 }

布局文件：

<LinearLayout 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"
android:orientation="vertical" >

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Username:" />

<EditText
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="text" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="User Age:" />

<EditText
android:id="@+id/age"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />

<Button
android:id="@+id/submit_get"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Submit using GET" />

<Button
android:id="@+id/submit_post"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Submit using POST" />

<TextView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#0000FF"
android:textSize="14sp" >
</TextView>

</LinearLayout>

须在androidMenifest中配置联网权限；