Android客户端和服务器端数据交互的第二种方法

水深无声 2022-08-06 11:03 149阅读 0赞

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繁杂，对于初学者来说这是不利的，现在介绍几种代码简单、逻辑清晰的交互例子，本篇博客介绍第二种：

一、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=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();
    	}
    }

代码2：修改名为“web.xml”的文件

<?xml version="1.0" encoding="UTF-8"?>
    <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>

二、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();
    		}
    	};
    }

代码2：添加名为“android\_client.xml”的文件

【[0分下载该Demo][0_Demo]】

[0_Demo]: http://download.csdn.net/download/wangshuxuncom/8364613