Android手机 (客户端)和PCweb 端(服务端)的socket通信

实例：手机端登录，把登录名和密码发送到服务端，服务端在接收到用户名密码之后返回一个”ok”给客户端，客户端进行打印/判断

手机客户端代码：

package com.example.registerlogin;import java.io.BufferedReader;import java.io.DataInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;public class MainActivity extends Activity implements OnClickListener {private String url = "192.168.111.111";// ip地址，这里是指服务端所在的机器的ip地址private int port = 8008;// 端口号，不要写你本机其他 程序已经占用的端口号，其他随便取，这个端口号也是服务端需要监听的端口号private EditText usernameET, passwordET;// 输入用户名和密码private Button registerBT, loginBT;// 注册和登录按钮private String username, password;private Socket socket;private PrintWriter printWriter; //写private BufferedReader bufR;//读@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);usernameET = (EditText) findViewById(R.id.usernameET);passwordET = (EditText) findViewById(R.id.passwordET);savePassCB = (CheckBox) findViewById(R.id.savePassCB);autoLoginCB = (CheckBox) findViewById(R.id.autoLoginCB);registerBT = (Button) findViewById(R.id.registerBT);loginBT = (Button) findViewById(R.id.loginBT);registerBT.setOnClickListener(this);loginBT.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.registerBT:Intent intent = new Intent();intent.setClass(MainActivity.this, RegisterActivity.class);startActivity(intent);break;case R.id.loginBT:// 这里需要开启另一个线程，因为联网操作是一个耗时的操作，如果在主线程中联网容易造成activity的假死现象new Thread(new LoginThread()).start();System.out.println("username : ---------" + username);System.out.println("password : ==============" + password);break;}}class LoginThread implements Runnable {@Overridepublic void run() {try {socket = new Socket(url, port);//new socket对象，指定ip和端口号printWriter = new PrintWriter(socket.getOutputStream(), true);//建议使用这个类进行写， readLine()和read()是一个阻塞式方法，readLine()如果没有读到换行，则一直在等待不会终止，read() 是读到-1，所以选择缓冲流读取的话，则printWriter能够在末尾写入换行让读取到一行的时候能够停止。当然也可以只读一行，但是如果没有读到换行符，readLine()同样会阻塞在那里，这时候就需要在写(源)的时候自己写上换行符。true：自动刷新。使用缓冲流写的时候也需要刷新。bufR = new BufferedReader(new InputStreamReader(socket.getInputStream()));String logic = "<LOGIC>"; //给登录信息加上头部，让客户端接收的时候能够判断是登录还是注册username = usernameET.getText().toString();password = passwordET.getText().toString();String msgOut = logic + username + "|" + password;printWriter.println(msgOut);//写数据，并且带上了换行符String line = null;while((line = bufR.readLine()) != null){System.out.println(line);if ("ok".equals(line)) {// 登录成功System.out.println("登录成功");}}} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {try {if (bufR != null)bufR.close();} catch (IOException e1) {e1.printStackTrace();}try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

web服务端代码：

新建一个web工程。首先得在配置文件中监听一个端口号(即客户端指定的端口号)，并指定一个监听类。

web.xml

<context-param><param-name>socketPort</param-name><param-value>8008</param-value></context-param><listener><description>Socket 服务随web 启动而启动</description><listener-class>com.bafengte.ServerSocketListener</listener-class></listener>

在web工程src下新建一个ServerSocketListener类：

import javax.servlet.ServletContext;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class ServerSocketListener implements ServletContextListener {private SocketThread socketThread;public void contextDestroyed(ServletContextEvent e) {//当Servlet 容器终止Web 应用时调用该方法// TODO Auto-generated method stubif (socketThread != null && !socketThread.isInterrupted()) {socketThread.closeServerSocket();socketThread.interrupt();}}public void contextInitialized(ServletContextEvent e) {//当Servlet 容器启动Web 应用时调用该方法。// TODO Auto-generated method stubServletContext servletContext = e.getServletContext();if (socketThread == null) {socketThread = new SocketThread(servletContext, null);socketThread.start(); // servlet上下文初始化时启动socket服务端线程}}}

在web工程src下新建一个SocketThread类：

import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;import javax.servlet.ServletContext;public class SocketThread extends Thread {private ServletContext servletContext;private ServerSocket serverSocket;public SocketThread(ServletContext servletContext, ServerSocket serverSocket) {this.servletContext = servletContext;// 从web.xml中context-param节点获取socket端口String port = this.servletContext.getInitParameter("socketPort");if (serverSocket == null) {try {this.serverSocket = new ServerSocket(port);//服务器端核心代码1} catch (IOException e) {e.printStackTrace();}}}public void run() {while (!this.isInterrupted()) { // 线程未中断执行循环try {Socket socket = serverSocket.accept();//服务器端核心代码2if (socket != null)new ProcessSocketData(socket, this.servletContext).start();} catch (IOException e) {e.printStackTrace();}}}public void closeServerSocket() {try {if (serverSocket != null && !serverSocket.isClosed())serverSocket.close();} catch (IOException e) {e.printStackTrace();}}}

在web工程src下新建一个ProcessSocketData类：

import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import javax.servlet.ServletContext;public class ProcessSocketData extends Thread {private Socket socket;private ServletContext servletContext;public ProcessSocketData() {super();}public ProcessSocketData(Socket socket, ServletContext servletContext) {this.socket = socket;this.servletContext = servletContext;}public void run() {try {BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));//服务器端核心代码，以下都是PrintWriter printWriter = new PrintWriter(socket.getOutputStream(),true);String line = null;while((line = br.readLine()) != null){System.out.println("接收到的数据 ------" + line);printWriter.println("ok");}} catch (IOException e) {e.printStackTrace();}}}