分享socket 客户端-服务器入门代码

这是从另一个论坛的代码修改的，原来有很多错误，我已经修改，供大家欣赏！

    这中间还用到了设计模式中的代理模式，还有一些jframe入门的东西

    1 客户端

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JavaClient extends JFrame implements ActionListener//以JFrame为基类，实现ActionListener接口
{
    JButton sendButton; //"发送"按钮
    JTextField inputField; // 输入框
    JTextArea outputArea; // 服务器返回框
    static ClientAgent ca;
    public JavaClient() //在建构函数中完成图形界面的初始化
    {
        inputField=new JTextField("这里输入..."); //供客户端输入的文本框
        outputArea=new JTextArea("服务器返回"); //显示服务器返回数据的文本域
        sendButton=new JButton("发送");
        JPanel panel=new JPanel(); //新建面板
        panel.setLayout(new BorderLayout()); //设置面板风格为BorderLayout
        panel.add(inputField,BorderLayout.NORTH); //放置控件
        panel.add(outputArea,BorderLayout.CENTER);
        panel.add(sendButton,BorderLayout.PAGE_END);
        sendButton.addActionListener(this);
        setTitle("Java通讯客户端");
        setContentPane(panel);
    }
    public static void main(String[] args)
    {
        JavaClient frame=new JavaClient();
        frame.pack();//注意javaClient是JFrame的派生类，调用基类方法
        frame.setVisible(true);
        ca=new ClientAgent("127.0.0.1",1001); //传递服务器名称和端口号
    }
    public void actionPerformed(ActionEvent ae)
    {
        if(ae.getSource()==sendButton) //判断事件源控件是否是"发送"按钮
        {
        try
        {
            ca.sendRequest(inputField.getText()); //发送文本框中的文本
            System.out.println("send:"+inputField.getText());
        }catch(Exception ex)
        {
            ex.printStackTrace();
        }
        outputArea.append("n"+ca.getResponse()); //接收服务器回应并写入文本域
        }
    }
}

    2客户代理端

import java.io.*;
import java.net.*;
/**
 * @author Administrator
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class ClientAgent {
    PrintStream ops; //输出流（指向服务器）
    DataInputStream ips;//输入流（来自服务器）
    BufferedReader bf;
    String cltRequest;//客户端请求
    String svrResponse;//服务器端回应

    public ClientAgent(String serverName,int port)
    {
        try
        {
        Socket clientSocket=new Socket(serverName,port ); //根据服务器名和端口号建立Socket
        ops=new PrintStream(clientSocket.getOutputStream());//获得Socket的输出流
        //ips=new DataInputStream(clientSocket.getInputStream());//获得Socket的输入流
        bf = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        }
        catch(Exception e)
        {
        System.out.println("无法连接服务器!");
        }
    }
    public void sendRequest(String request)
    {
        ops.println(request); //向Socket的输出流写入字符串
    }
    public String getResponse()
    {
        String str=new String();
        try
        {
            //str=ips.readLine(); //从Socket的输入流读入字符串

            str = bf.readLine();
            System.out.println("服务器返回："+str);
        }
        catch(IOException e){} //必须捕获错误
        return str;
    }
}

    3 服务器端

import java.io.*;
import java.net.*;
/**
 * @author Administrator
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class ServerAgent {
    ServerSocket svrSkt=null;
    Socket cltSkt=null;
    //DataInputStream input=null; //输入流，来自客户端
    BufferedReader inf=null;
    PrintStream output=null; //输出流，指向客户端

    public ServerAgent(int port) //main()函数传递监听端口号
    {
        System.out.println("服务器代理正在监听，端口："+port);
        try
        {
            svrSkt=new ServerSocket(port); //开始监听
        }catch(IOException e){System.out.println("监听端口"+port+"失败");}
        try
        {
            cltSkt=svrSkt.accept(); //接收连接请求
        }
        catch(IOException e){System.out.println("连接失败");}
        try
        {
            //input=new DataInputStream(cltSkt.getInputStream()); //获得输入流
            inf = new BufferedReader(new InputStreamReader(cltSkt.getInputStream()));
            output=new PrintStream(cltSkt.getOutputStream()); //获得输出流
        }
        catch(IOException e){}
        output.println("欢迎......");
    }
    public String getRequest()
    {
        System.out.println("Server getRequest");
        String frmClt=null;
        try
        {
            //frmClt=input.readLine();
            frmClt = inf.readLine();
            System.out.println("After Server getRequest:"+frmClt);
        }
        catch(Exception e){
            System.out.println("无法读取端口.....");
            System.exit(0);
        }
        return frmClt;
    }
    public void sendResponse(String response)
    {
        System.out.println("Server sendResponse");
        try
        {
            output.println(response);
        }
        catch(Exception e){
            System.out.println("写端口失败......");
            System.exit(0);
        }
    }
    public static void main(String[] args) throws IOException
    {
        ServerAgent sa=new ServerAgent(1001);
        while(true)
        {
            sa.sendResponse(sa.getRequest());
        }
    }

}