JavaSE小练习(简单的聊天器)

为了巩固JavaSE的知识，练习一哈，大神绕道。下面贴一下代码。

Client端代码

package GUI;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ChatClient extends JFrame {

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    JTextField tfTxt = new JTextField();

    JTextArea taContent = new JTextArea();

    Socket s = null;

    DataOutputStream dos = null;

    DataInputStream dis = null;

    Thread TRecv = new Thread(new RecvThread());

    private boolean bConnected = true;

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new ChatClient().lauchFrame();
    }

    public void lauchFrame(){
        //主窗口设置
        this.setTitle("弱智交流平台？");
        this.setSize(500, 500);
        this.setLocationRelativeTo(null);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent arg0){
                disconnect();
                System.exit(0);
            }
        });
        //设置布局
        this.setLayout(new BorderLayout());
        this.add(taContent, BorderLayout.NORTH);
        this.add(tfTxt, BorderLayout.SOUTH);
        //设置组件大小
        tfTxt.setPreferredSize(new Dimension(500, 50));
        taContent.setPreferredSize(new Dimension(500, 400));
        //文本域内容自动换行
        taContent.setLineWrap(true);
        //字体设置
        Font font1 = new Font("宋体",Font.BOLD,24);
        taContent.setFont(font1);
        Font font2 = new Font("宋体",Font.BOLD,18);
        tfTxt.setFont(font2);
        //将文本框的内容写入文本域的事件
        tfTxt.addActionListener(new TFListener());

        this.setVisible(true);

        //连接服务端
        connect();
        //启动线程接受信息
        TRecv.start();
    }

    private class TFListener implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
            // TODO Auto-generated method stub
            //将文本框内容写入文本域
            String str = tfTxt.getText().trim();
            tfTxt.setText("");

            //将文本框内容写入服务端
            try{
                dos.writeUTF(str);
                dos.flush();
            }catch(IOException e3){
                e3.printStackTrace();
            }
        }

    }

    public void connect(){
        try{
            s = new Socket("127.0.0.1", 7777);
            dos = new DataOutputStream(s.getOutputStream());
            dis = new DataInputStream(s.getInputStream());
            System.out.println("已经连上服务端！");
        }catch(UnknownHostException e1){
            e1.printStackTrace();
        }catch(IOException e2){
            e2.printStackTrace();
        }

    }

    public void disconnect(){
        try{
            dos.close();
            dis.close();
            s.close();
        }catch(IOException e){
            e.printStackTrace();
        }

    }

    private class RecvThread implements Runnable{

        @Override
        public void run() {
            // TODO Auto-generated method stub
            while(bConnected){
                String str;
                try {
                    str = dis.readUTF();
                    taContent.setText(taContent.getText()+str+"\n");
                }catch(SocketException e){
                    System.out.println("退出了！");
                    bConnected = false;
                }catch(EOFException e){
                    bConnected = false;
                    System.out.println("退出了！");
                }catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

    }

}

Server端

package GUI;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.List;

public class ChatServer {

    List<Client> clients = new ArrayList<Client>();

    ServerSocket ss = null;

    public static void main(String[] args) {

        new ChatServer().start();

    }

    public void start(){
        try{
            ss = new ServerSocket(7777);
        }catch(IOException e){
            e.printStackTrace();
        }
        try{
            //服务器不止连接一个客户端
            while(true){
                Socket s = ss.accept();
                System.out.println("连接一个客户端！");
                Client c = new Client(s);
                clients.add(c);
                new Thread(c).start();
            }
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try {
                ss.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    private class Client implements Runnable{

        private Socket s;

        private DataInputStream dis;

        private DataOutputStream dos;

        public Client(Socket s){
            this.s = s;
            try{
                dis = new DataInputStream(s.getInputStream());
                dos = new DataOutputStream(s.getOutputStream());
            }catch(IOException e){
                e.printStackTrace();
            }
        }

        public void sent(String s){
            try {
                dos.writeUTF(s);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        @Override
        public void run() {
            Client c = null;
            try{
                while(true){
                    String str = dis.readUTF();
                    System.out.println(str);
                    for(int i=0; i<clients.size();i++){
                        c = clients.get(i);
                        c.sent(str);
                    }
                }
            }catch(SocketException e){
                if(c != null){
                    clients.remove(this);
                }
            }catch(EOFException e){
                System.out.println("客户端断开连接！");
            }catch(IOException e){
                e.printStackTrace();
            }finally{
                try{
                    if(dis != null){
                        dis.close();
                    }
                    if(dos != null){
                        dos.close();
                    }
                    if(s != null){
                        s.close();
                    }
                }catch(IOException e){
                    e.printStackTrace();
                }
            }
        }
    }
}

初学Java到现在，第一次把所学的一些知识，联系起来，虽然是个很小的程序，但是也是有收获的，希望自己继续努力！

原文地址：https://www.cnblogs.com/Vamps0911/p/10743812.html