package com.ghj.packageofservlet;
 
import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class AndroidServerServlet extends HttpServlet {
 
 private static final long serialVersionUID = 6792396567928634227L;
 
 public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
  response.setContentType(text/plain; charset=UTF-8);
  request.setCharacterEncoding(UTF-8);
  System.err.println(request.getParameter(clientData));
  PrintWriter printWriter = response.getWriter();
  printWriter.print(您好Android客户端！);
  printWriter.flush();
  printWriter.close();
 }
}

<!--?xml version=1.0 encoding=UTF-8?-->
<web-app http:="java.sun.com=" javaee="ns=" version="2.5" web-app_2_5.xsd="xml=" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://java.sun.com/xml/ns/javaee"><servlet>
  <servlet-name>AndroidServerServlet</servlet-name>
  <servlet-class>com.ghj.packageofservlet.AndroidServerServlet</servlet-class>
 </servlet>
 
 <servlet-mapping>
  <servlet-name>AndroidServerServlet</servlet-name>
  <url-pattern>/AndroidServerServlet</url-pattern>
 </servlet-mapping>
</web-app>

package com.example.androidclient;
 
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
 
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
 
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
 
public class AndroidClientActivity extends Activity {
  
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.android_client);
 
  Button sendButton = (Button) findViewById(R.id.send_button);
  sendButton.setOnClickListener(new OnClickListener(){
   @Override
   public void onClick(View v) {
    new Thread(new Runnable(){
     @Override
     public void run() {
      HttpPost httpRequest = new HttpPost(http://172.16.99.207:8080/AndroidServer/AndroidServerServlet);
      List<namevaluepair> params = new ArrayList<namevaluepair>();
      params.add(new BasicNameValuePair(clientData, 您好服务器端！));
      try {
       Message message = new Message();
       Bundle bundle = new Bundle();
       httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));//设置请求参数项
       HttpClient httpClient = new DefaultHttpClient();
       HttpResponse httpResponse = httpClient.execute(httpRequest);//执行请求返回响应
       if(httpResponse.getStatusLine().getStatusCode() == 200){//判断是否请求成功
        bundle.putString(msg, EntityUtils.toString(httpResponse.getEntity()));
       }else{
        bundle.putString(msg, 没有获取到Android服务器端的响应！);
       }
       message.setData(bundle);
       handler.sendMessage(message);
      } catch (ClientProtocolException e) {
       e.printStackTrace();
      } catch (UnsupportedEncodingException e) {
       e.printStackTrace();
      } catch (IOException e) {
       e.printStackTrace();
      }
     }
    }).start();
   }
  });
 }
  
 private Handler handler = new Handler(){
  @Override
  public void handleMessage(Message message) {
   super.handleMessage(message);
   Bundle bundle = message.getData();
   String msg = bundle.getString(msg);
   Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
  }
 };
}