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：

 1 package com.jiao.socketdemo;
 2
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.IOException;
 6 import java.io.InputStreamReader;
 7 import java.io.OutputStreamWriter;
 8 import java.net.ServerSocket;
 9 import java.net.Socket;
10
11 public class ChatServer extends Thread {
12     private ServerSocket server = null;
13     private static final int PORT = 5550;
14     private BufferedWriter writer;
15     private BufferedReader reader;
16
17     public ChatServer() throws IOException {
18
19         CreateSocket();//初始化socket
20     }
21
22     @Override
23     public void run() {
24
25         Socket client;
26         String txt;
27
28         try {
29             while (true) {
30                 // 获取应答消息
31                 client = ResponseSocket();
32                 while (true) {
33                     // 接受客户端信息
34                     txt = ReceiveMsg(client);
35
36                     System.out.println("客户端发来的消息：" + txt);
37
38                     SendMsg(client, txt);
39
40                     if (true)
41                         break;
42                 }
43                 CloseSocket(client);
44             }
45         } catch (Exception e) {
46             // TODO: handle exception
47         }
48
49     }
50
51     //关闭连接
52     private void CloseSocket(Socket client) throws IOException {
53         reader.close();
54         writer.close();
55         client.close();
56
57     }
58
59     //封装发送消息的方法
60     private void SendMsg(Socket socket, String Msg) throws IOException {
61         writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
62         writer.write(Msg + "\n");
63         writer.flush();
64     }
65
66     //封装接受消息的方法
67     private String ReceiveMsg(Socket socket) throws IOException {
68         reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
69         String txt = reader.readLine();
70         return txt;
71     }
72
73     //接受消息
74     private Socket ResponseSocket() throws IOException {
75         Socket client = server.accept();
76         return client;
77     }
78
79     //初始化socket
80     private void CreateSocket() throws IOException {
81         server = new ServerSocket(PORT, 100);
82     }
83
84 }

启动服务端的代码如下：

1 // 创建聊天服务器
2         ChatServer chatserver = new ChatServer();
3         // 检测服务器是否已经启动，如果没有则启动服务器
4         if (chatserver != null) {
5             chatserver.start();
6         }

以下是客户端的代码：

 1 package com.example.socketclient;
 2
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.IOException;
 6 import java.io.InputStreamReader;
 7 import java.io.OutputStreamWriter;
 8 import java.net.Socket;
 9 import java.net.UnknownHostException;
10 import android.app.Activity;
11 import android.os.Bundle;
12
13 public class MainActivity extends Activity {
14     public static int SERVER_PORT = 5550;
15
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.activity_main);
20
21         new Thread() {
22             public void run() {
23                 message();
24             }
25         }.start();
26     }
27
28     private void message() {
29         try {
30             Socket client = RequestSocket("这里是服务器的IP", SERVER_PORT);
31             SendMsg(client, "client send");
32             String txt = ReceiveMsg(client);
33             System.out.println("服务端返回数据：" + txt);
34         } catch (Exception e) {
35
36         }
37     };
38
39     // 客户端获取消息类
40     private Socket RequestSocket(String host, int port)throws UnknownHostException, IOException {
41         Socket socket = new Socket(host, port);
42         return socket;
43     }
44
45     // 客户端发送消息类
46     private void SendMsg(Socket socket, String msg) throws IOException {
47         // 将要发送的消息写入Buffer 中
48         BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
49         // 格式转换
50         writer.write(msg.replace("\n", " ") + "\n");
51         // 刷新，发送
52         writer.flush();
53     }
54
55     // 客户端接收消息
56     private String ReceiveMsg(Socket socket) throws IOException {
57         // 写入读Buffer 中// 获取接收的消息到数据流中
58         BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
59         // 读取消息到字符串中
60         String Msg = reader.readLine();
61         // 以字符串的方式返回消息
62         return Msg;
63     }
64
65 }