Android 网络编程基础之简单聊天程序

前一篇讲了Android的网络编程基础，今天写了一个简单的聊天程序分享一下

首先是服务端代码：

 package com.jiao.socketdemo;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.net.ServerSocket;
 import java.net.Socket;

 public class ChatServer extends Thread {
     private ServerSocket server = null;
     private static final int PORT = 5550;
     private BufferedWriter writer;
     private BufferedReader reader;

     public ChatServer() throws IOException {

         CreateSocket();//初始化socket
     }

     @Override
     public void run() {

         Socket client;
         String txt;

         try {
             while (true) {
                 // 获取应答消息
                 client = ResponseSocket();
                 while (true) {
                     // 接受客户端信息
                     txt = ReceiveMsg(client);

                     System.out.println("客户端发来的消息：" + txt);

                     SendMsg(client, txt);

                     if (true)
                         break;
                 }
                 CloseSocket(client);
             }
         } catch (Exception e) {
             // TODO: handle exception
         }

     }

     //关闭连接
     private void CloseSocket(Socket client) throws IOException {
         reader.close();
         writer.close();
         client.close();

     }

     //封装发送消息的方法
     private void SendMsg(Socket socket, String Msg) throws IOException {
         writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
         writer.write(Msg + "\n");
         writer.flush();
     }

     //封装接受消息的方法
     private String ReceiveMsg(Socket socket) throws IOException {
         reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
         String txt = reader.readLine();
         return txt;
     }

     //接受消息
     private Socket ResponseSocket() throws IOException {
         Socket client = server.accept();
         return client;
     }

     //初始化socket
     private void CreateSocket() throws IOException {
         server = new ServerSocket(PORT, 100);
     }

 }

启动服务端的代码如下：

 // 创建聊天服务器
         ChatServer chatserver = new ChatServer();
         // 检测服务器是否已经启动，如果没有则启动服务器
         if (chatserver != null) {
             chatserver.start();
         }

以下是客户端的代码：

 package com.example.socketclient;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.net.Socket;
 import java.net.UnknownHostException;
 import android.app.Activity;
 import android.os.Bundle;

 public class MainActivity extends Activity {
     public static int SERVER_PORT = 5550;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         new Thread() {
             public void run() {
                 message();
             }
         }.start();
     }

     private void message() {
         try {
             Socket client = RequestSocket("这里是服务器的IP", SERVER_PORT);
             SendMsg(client, "client send");
             String txt = ReceiveMsg(client);
             System.out.println("服务端返回数据：" + txt);
         } catch (Exception e) {

         }
     };

     // 客户端获取消息类
     private Socket RequestSocket(String host, int port)throws UnknownHostException, IOException {
         Socket socket = new Socket(host, port);
         return socket;
     }

     // 客户端发送消息类
     private void SendMsg(Socket socket, String msg) throws IOException {
         // 将要发送的消息写入Buffer 中
         BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
         // 格式转换
         writer.write(msg.replace("\n", " ") + "\n");
         // 刷新，发送
         writer.flush();
     }

     // 客户端接收消息
     private String ReceiveMsg(Socket socket) throws IOException {
         // 写入读Buffer 中// 获取接收的消息到数据流中
         BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
         // 读取消息到字符串中
         String Msg = reader.readLine();
         // 以字符串的方式返回消息
         return Msg;
     }

 }