java聊天对话代码 java简单聊天程序代码

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月光倾城美 2024-08-14 22:54:20

文章标签 java聊天对话代码 java 操作系统网络套接字 文章分类 Java 后端开发

socket

Socket通常用来实现客户方和服务方的连接，一个Socket由一个IP地址和一个端口号唯一确定

socket编程步骤

创建Socket；
打开连接到Socket的输入/出流；
按照一定的协议对Socket进行读/写操作；
关闭Socket

tcp套接字编程

当服务器运行时，客户机进程向服务器发起一个tcp连接，在客户机中通过创建一个套接字来完成。客户机创建套接字的时候指定服务器ip地址和端口号。客户机生成套接字之后客户机tcp和服务器tcp发起三次握手并创建一个tcp连接。三次握手期间，客户机进程与服务器套接字进行交互，服务器套接字创建一个新的连接套接字与客户机提供服务。tcp连接是客户机套接字与服务器连接套接字的一个直接虚拟管道。客户机进程向客户机端的套接字发送数据，tcp连接保证服务器端进程通过连接套接字按发送的顺序收到数据。tcp在客户机和服务器进程之间提供了可靠的字节流服务。

UDP套接字编程

udp没有管道，一个进程向另外一个进程发送数据需要附加目的地进程ip地址和端口号。udp提供不可靠面向报文的服务。

tcp套接字与udp套接字的不同

1、udp没有进行初始握手，不需要创建欢迎套接字；

2、udp没有流与套接字联系

3、udp发送主机将ip地址和端口号与它发送的字节绑定生成分组

4、udp接收进程必须拆开分组

基于tcp socket的聊天程序

1、客户端创建连接 public void connect()，创建套接字，指定输入输出流

2、设置监听事件，输入文字按回车之后 public void actionPerformed，将文字发送到与套接字对应的输出流

3、另外创建一个线程 Thread tRecv = new Thread(new RecvThread()); tRecv.start(); 当连接没有中断时候 while(bConnected) ，从与套接字对应的输入流中读取信息，并显示到聊天窗口中

4、点击关闭按钮时，关闭输入输出流，关闭套接字，退出用户界面

客户端代码

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class ChatClient extends Frame {
	Socket s = null;
	DataOutputStream dos = null;
	DataInputStream dis = null;
	private boolean bConnected = false;

	TextField tfTxt = new TextField();

	TextArea taContent = new TextArea();
	
	Thread tRecv = new Thread(new RecvThread()); 
	
	public static void main(String[] args) {
		new ChatClient().launchFrame(); 
	}

	public void launchFrame() {
		setLocation(400, 300);
		this.setSize(300, 300);
		add(tfTxt, BorderLayout.SOUTH);
		add(taContent, BorderLayout.NORTH);
		pack();
		this.addWindowListener(new WindowAdapter() {

			@Override
			public void windowClosing(WindowEvent arg0) {
				disconnect();
				System.exit(0);
			}
			
		});
		tfTxt.addActionListener(new TFListener());
		setVisible(true);
		connect();
		
		tRecv.start();
	}
	
	public void connect() {
		try {
			s = new Socket("127.0.0.1", 8888);
			dos = new DataOutputStream(s.getOutputStream());
			dis = new DataInputStream(s.getInputStream());
			System.out.println("connected!");
			bConnected = true;
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	public void disconnect() {
		try {
			dos.close();
			dis.close();
			s.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	private class TFListener implements ActionListener {

		public void actionPerformed(ActionEvent e) {
			String str = tfTxt.getText().trim();
			tfTxt.setText("");
			
			try {
				dos.writeUTF(str);
				dos.flush();
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			
		}
		
	}
	
	private class RecvThread implements Runnable {

		public void run() {
			try {
				while(bConnected) {
					String str = dis.readUTF();
					taContent.setText(taContent.getText() + str + '\n');
				}
			} catch (SocketException e) {
				System.out.println("退出了，bye!");
			} catch (EOFException e) {
				System.out.println("退出了，bye!");
			} catch (IOException e) {
				e.printStackTrace();
			} 
			
		}
		
	}
}
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class ChatClient extends Frame {
	Socket s = null;
	DataOutputStream dos = null;
	DataInputStream dis = null;
	private boolean bConnected = false;

	TextField tfTxt = new TextField();

	TextArea taContent = new TextArea();
	
	Thread tRecv = new Thread(new RecvThread()); 
	
	public static void main(String[] args) {
		new ChatClient().launchFrame(); 
	}

	public void launchFrame() {
		setLocation(400, 300);
		this.setSize(300, 300);
		add(tfTxt, BorderLayout.SOUTH);
		add(taContent, BorderLayout.NORTH);
		pack();
		this.addWindowListener(new WindowAdapter() {

			@Override
			public void windowClosing(WindowEvent arg0) {
				disconnect();
				System.exit(0);
			}
			
		});
		tfTxt.addActionListener(new TFListener());
		setVisible(true);
		connect();
		
		tRecv.start();
	}
	
	public void connect() {
		try {
			s = new Socket("127.0.0.1", 8888);
			dos = new DataOutputStream(s.getOutputStream());
			dis = new DataInputStream(s.getInputStream());
			System.out.println("connected!");
			bConnected = true;
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	public void disconnect() {
		try {
			dos.close();
			dis.close();
			s.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	private class TFListener implements ActionListener {

		public void actionPerformed(ActionEvent e) {
			String str = tfTxt.getText().trim();
			tfTxt.setText("");
			
			try {
				dos.writeUTF(str);
				dos.flush();
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			
		}
		
	}
	
	private class RecvThread implements Runnable {

		public void run() {
			try {
				while(bConnected) {
					String str = dis.readUTF();
					taContent.setText(taContent.getText() + str + '\n');
				}
			} catch (SocketException e) {
				System.out.println("退出了，bye!");
			} catch (EOFException e) {
				System.out.println("退出了，bye!");
			} catch (IOException e) {
				e.printStackTrace();
			} 
			
		}
		
	}
}

服务端程序

1、创建ServerSocket，ss = new ServerSocket(8888);

2、在ServerSocket运行的时候 while (started)，侦听从客户端发来的请求并创建连接连接套接字 Socket s = ss.accept();

3、创建于连接套接字相关的输入输出流

4、实现runnable接口的run方法，当连接的时候 while (bConnected)，从与套接字相关的输入流中读取数据，然后传递给线程列表数组中的每一个线程，每一个线程使用与之相关联的连接套接字的输出向线程发送消息传递给客户端进行处理。

import java.io.*;
import java.net.*;
import java.util.*;

public class ChatServer {
	boolean started = false;
	ServerSocket ss = null;

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

	public static void main(String[] args) {
		new ChatServer().start();
	}

	public void start() {
		try {
			ss = new ServerSocket(8888);
			started = true;
			System.out.println("端口已开启,占用8888端口号....");
		} catch (BindException e) {
			System.out.println("端口使用中....");
			System.out.println("请关掉相关程序并重新运行服务器！");
			System.exit(0);
		} catch (IOException e) {
			e.printStackTrace();
		}

		try {

			while (started) {
				Socket s = ss.accept();
				Client c = new Client(s);
				System.out.println("a client connected!");
				new Thread(c).start();
				clients.add(c);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				ss.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	class Client implements Runnable {
		private Socket s;
		private DataInputStream dis = null;
		private DataOutputStream dos = null;
		private boolean bConnected = false;

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

		public void send(String str) {
			try {
				dos.writeUTF(str);
			} catch (IOException e) {
				clients.remove(this);
				System.out.println("对方退出了！我从List里面去掉了！");
			}
		}

		public void run() {
			try {
				while (bConnected) {
					String str = dis.readUTF();
					System.out.println(str);
					for (int i = 0; i < clients.size(); i++) {
						Client c = clients.get(i);
						c.send(str);
					}
				}
			} catch (EOFException e) {
				System.out.println("Client closed!");
			} catch (IOException e) {
				e.printStackTrace();
			} finally {
				try {
					if (dis != null)
						dis.close();
					if (dos != null)
						dos.close();
					if (s != null) {
						s.close();
					}

				} catch (IOException e1) {
					e1.printStackTrace();
				}

			}
		}

	}
}
import java.io.*;
import java.net.*;
import java.util.*;

public class ChatServer {
	boolean started = false;
	ServerSocket ss = null;

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

	public static void main(String[] args) {
		new ChatServer().start();
	}

	public void start() {
		try {
			ss = new ServerSocket(8888);
			started = true;
			System.out.println("端口已开启,占用8888端口号....");
		} catch (BindException e) {
			System.out.println("端口使用中....");
			System.out.println("请关掉相关程序并重新运行服务器！");
			System.exit(0);
		} catch (IOException e) {
			e.printStackTrace();
		}

		try {

			while (started) {
				Socket s = ss.accept();
				Client c = new Client(s);
				System.out.println("a client connected!");
				new Thread(c).start();
				clients.add(c);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				ss.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	class Client implements Runnable {
		private Socket s;
		private DataInputStream dis = null;
		private DataOutputStream dos = null;
		private boolean bConnected = false;

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

		public void send(String str) {
			try {
				dos.writeUTF(str);
			} catch (IOException e) {
				clients.remove(this);
				System.out.println("对方退出了！我从List里面去掉了！");
			}
		}

		public void run() {
			try {
				while (bConnected) {
					String str = dis.readUTF();
					System.out.println(str);
					for (int i = 0; i < clients.size(); i++) {
						Client c = clients.get(i);
						c.send(str);
					}
				}
			} catch (EOFException e) {
				System.out.println("Client closed!");
			} catch (IOException e) {
				e.printStackTrace();
			} finally {
				try {
					if (dis != null)
						dis.close();
					if (dos != null)
						dos.close();
					if (s != null) {
						s.close();
					}

				} catch (IOException e1) {
					e1.printStackTrace();
				}

			}
		}

	}
}

运行效果

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