网上有很多例子来演示Android客户端和服务器端数据如何实现交互不过这些例子大多比较复杂，对初学者来讲这是不利的，现在介绍几种代码简单、逻辑清晰的交互例子，本篇博客介绍第2种：
1、服务器端：
代码1：添加名为“AndroidServerServlet.java”的文件
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=UTF⑻");
request.setCharacterEncoding("UTF⑻");
System.err.println(request.getParameter("clientData"));
PrintWriter printWriter = response.getWriter();
printWriter.print("您好Android客户端！");
printWriter.flush();
printWriter.close();
}
}
代码2：修改名为“web.xml”的文件
<?xml version="1.0" encoding="UTF⑻"?>
<web-app version="2.5" 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
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<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>
2、Android手机客户端：
代码1：添加名为“AndroidClientActivity.java”的文件
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));//设置要求参数项
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(httpRequest);//履行要求返回响应
if(httpResponse.getStatusLine().getStatusCode() == 200){//判断是不是要求成功
bundle.putString("msg", EntityUtils.toString(httpResponse.getEntity()));
}else{
bundle.putString("msg", "没有获得到Android
服务器真个响应！");
}
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();
}
};
}
代码2：添加名为“android_client.xml”的文件
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/send_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/hello_server" />
</RelativeLayout>
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