传输层socket通讯之java实现

使用流套接字来示例一个客户/服务器的应用。客户端的应用连接到服务器上面，服务端的应用发送数据到客户端，然后客户将收到的数据显示出来。

服务端代码：

package socket;

import java.awt.Event;
import java.awt.Frame;
import java.awt.TextArea;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server extends Frame {
    TextArea display;

    public Server() {
        super("Server");
        display = new TextArea(20, 5);
        add("Center", display);
        resize(300, 150);
        show();
    }
public void runServer(){
    ServerSocket server;
    Socket connection;
    OutputStream output;
    PrintWriter pw = null;
    try {
        /*建立一个ServerSocket，第一个参数是端口port，第二个参数是是队列长度queueLength，即规定了服务器能够处理的
        等待连接的客户数目，如果满了，将自动拒绝客户的请求
        */
        server = new ServerSocket(5000,100);
        //等待请求,此方法会一直阻塞,直到获得请求才往下走
        connection  = server.accept();
        display.setText("connection received...\n");
        display.setText("Sending data...\n");
        //获得和Socket相关联的OutputStream的一个引用
        output = connection.getOutputStream();
        pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(connection.getOutputStream())),true);
        String s = new String("Connection successful\n");
//        //逐个字符发送
//        for(int i = 0;i<s.length();i++){
//            //进行单一字节或字节组合的发送和接收
//            output.write((int)s.charAt(i));
//        }
        pw.println(s);
        display.appendText("Transmission complete. Closing socket.\n");
        //关闭socket
        connection.close();
        pw.flush();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
//保证用户在应用结束的时候关闭相应的窗口
    public boolean handleEvent(Event e){
        if(e.id == Event.WINDOW_DESTROY){
            hide();
            dispose();
            System.exit(0);
        }
        return super.handleEvent(e);
    }
    public static void main(String args[]){
        Server s = new Server();
        s.runServer();
    }
}

客户端代码：

package socket;

import java.awt.Event;
import java.awt.Frame;
import java.awt.TextArea;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client extends Frame{
    TextArea display;
    public Client() {
        super("Client");
        display = new TextArea(20, 10);
        add("Center", display);
        resize(300, 150);
        show();
    }
    public void runClient(){
        Socket client;
        InputStream input;
        BufferedReader br = null;
        try {
            client = new Socket(InetAddress.getLocalHost(),5000);
            display.appendText("Created Socket\n");
            input = client.getInputStream();
             br = new BufferedReader(new InputStreamReader(
                        client.getInputStream()));
            display.appendText("Created input stream\n");
            display.appendText("The text from the server is:\n\t");
            char c;
            //逐个字符读取数据
//            while((c = (char)input.read())!='\n'){
//                display.appendText(String.valueOf(c));
//            }
            String str = br.readLine();
            display.appendText(str);
            client.close();
            br.close();
        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
     public boolean handleEvent(Event e){
            if(e.id == Event.WINDOW_DESTROY){
                hide();
                dispose();
                System.exit(0);
            }
            return super.handleEvent(e);
        }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Client c = new Client();
        c.runClient();
    }

}