UDP群聊-编程知识

客户端


import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;public class ClientOneToMany_ClientFrame extends JFrame {private JTextArea ta_info;private JTextField tf_send;PrintWriter out;// 声明输出流对象/*** Launch the application* * @param args*/public static void main(String args[]) {EventQueue.invokeLater(new Runnable() {public void run() {try {ClientOneToMany_ClientFrame frame = new ClientOneToMany_ClientFrame();frame.setVisible(true);frame.createClientSocket();} catch (Exception e) {e.printStackTrace();}}});}public void createClientSocket() {try {Socket socket = new Socket("127.0.0.1", 1978);// 创建套接字对象out = new PrintWriter(socket.getOutputStream(), true);// 创建输出流对象new ClientThread(socket).start();// 创建并启动线程对象} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}class ClientThread extends Thread {Socket socket;public ClientThread(Socket socket) {this.socket = socket;}public void run() {try {BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));// 创建输入流对象while (true) {String info = in.readLine();// 读取信息ta_info.append(info + "\n");// 在文本域中显示信息if (info.equals("88")) {break;// 结束线程}}} catch (IOException e) {e.printStackTrace();}}}private void send() {String info = tf_send.getText();// 获得输入的信息if (info.equals("")) {return;// 如果没输入信息则返回，即不发送}if (info.equals("88")) {System.exit(0);// 如果没输入信息是88，则退出}out.println(info);// 发送信息out.flush();// 刷新输出缓冲区tf_send.setText(null);// 清空文本框}/*** Create the frame*/public ClientOneToMany_ClientFrame() {super();setTitle("客户端一对多通信——客户端程序");setBounds(100, 100, 385, 266);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);final JPanel panel = new JPanel();getContentPane().add(panel, BorderLayout.SOUTH);final JLabel label = new JLabel();label.setText("输入聊天内容：");panel.add(label);tf_send = new JTextField();tf_send.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent e) {send();// 调用方法发送信息}});tf_send.setPreferredSize(new Dimension(180, 25));panel.add(tf_send);final JButton button = new JButton();button.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent e) {send();// 调用方法发送信息}});button.setText("发  送");panel.add(button);final JScrollPane scrollPane = new JScrollPane();getContentPane().add(scrollPane, BorderLayout.CENTER);ta_info = new JTextArea();scrollPane.setViewportView(ta_info);//}}

服务端


import java.awt.BorderLayout;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;public class ClientOneToMany_ServerFrame extends JFrame {private JTextArea ta_info;private ServerSocket server; // 声明ServerSocket对象private Socket socket; // 声明Socket对象socketprivate Vector<Socket> vector = new Vector<Socket>();// 用于存储连接到服务器的客户端套接字对象public void createSocket() {try {server = new ServerSocket(1978);while (true) {ta_info.append("等待新客户连接......\n");socket = server.accept();// 创建套接字对象vector.add(socket);// 将套接字对象添加到向量对象中ta_info.append("客户端连接成功。" + socket + "\n");new ServerThread(socket).start();// 创建并启动线程对象}} catch (IOException e) {e.printStackTrace();}}class ServerThread extends Thread {Socket socket;public ServerThread(Socket socket) {this.socket = socket;}public void run() {try {BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));// 创建输入流对象while (true) {String info = in.readLine();// 读取信息for (Socket s : vector) {// 遍历所有客户端套接字对象if (s != socket) {// 如果不是发送信息的套接字对象PrintWriter out = new PrintWriter(s.getOutputStream(), true);// 创建输出流对象out.println(info);// 发送信息out.flush();// 刷新输出缓冲区}}}} catch (IOException e) {ta_info.append(socket + "已经退出。\n");vector.remove(socket);// 移除退出的客户端套接字}}}/*** Launch the application* * @param args*/public static void main(String args[]) {ClientOneToMany_ServerFrame frame = new ClientOneToMany_ServerFrame();frame.setVisible(true);frame.createSocket();}/*** Create the frame*/public ClientOneToMany_ServerFrame() {super();setTitle("客户端一对多通信——服务器端程序");setBounds(100, 100, 385, 266);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);final JScrollPane scrollPane = new JScrollPane();getContentPane().add(scrollPane, BorderLayout.CENTER);ta_info = new JTextArea();scrollPane.setViewportView(ta_info);}}

结果

第二类

服务端

 import java.io.*;
import java.net.*;
import java.util.ArrayList;
public class Server{public static ServerSocket server_socket;public static ArrayList<Socket> socketList=new ArrayList<Socket>();  public static void main(String []args){try{server_socket = new ServerSocket(5000);while(true){Socket socket = server_socket.accept();socketList.add(socket); //把sock对象加入sock集合ServerBO_Thread st=new ServerBO_Thread(socket,socketList); //初始化多线程st.start();//启动多线程}}catch(Exception ex){ex.printStackTrace();}finally{try{if(server_socket!=null){server_socket.close();}}catch(Exception ex){ex.printStackTrace();}}}public void encryptWrite(String src,DataOutputStream output)throws IOException{//将一个字符串转化为字符数组//System.out.println(src);char[] char_arr = src.toCharArray();//加密操作for(int i = 0;i<char_arr.length;i++){output.writeChar(char_arr[i]+13);}//用作结束标志符output.writeChar(2333);output.flush();}//读取并解密public String readDecrypt(DataInputStream input)throws IOException{String rtn="";while(true){int char_src =input.readChar();if(char_src!=2333){rtn=rtn+(char)(char_src-13);}else{break;}}return rtn;}
}
class ServerBO_Thread extends Thread{Socket client = null;ArrayList<Socket> clients;ServerBO_Thread(Socket s,ArrayList<Socket> ss){//初始化client=s;clients=ss; }public void run(){DataInputStream input = null;DataOutputStream output =null;try{input = new DataInputStream(client.getInputStream());Server bo = new Server();String receive=null;String send=null;while(true){//监视当前客户端有没有发来消息if(!client.isClosed()){receive=bo.readDecrypt(input);clients.trimToSize();String[] param = receive.split("&");if(")start".equals(param[1])){    //分析客户端发来的内容send = param[0]+"进入聊天室";}else{send = param[0]+"说:    "+param[1];}if(!("3333".equals(param[1]))){//3333为退出聊天室信号for(Socket socket:clients){ //遍历socke集合 //把读取到的消息发送给各个客户端  if(!socket.isClosed()){output = new DataOutputStream(socket.getOutputStream());bo.encryptWrite(send,output);}}  }else{//如果有客户端退出for(Socket socket:clients){ //遍历socke集合 if(socket!=client){//告诉其他人此人退出聊天室if(!(socket.isClosed())){output = new DataOutputStream(socket.getOutputStream());bo.encryptWrite(param[0]+"已退出聊天室",output);}}}output = new DataOutputStream(client.getOutputStream());bo.encryptWrite("3333",output);//返回信号给要退出的客户端，然后关闭线程client.close();input.close();output.close();}}else{break;}}}catch(Exception ex){ex.printStackTrace();}}
}

客户端

 
import java.io.IOException;
import java.util.Scanner;
import java.net.*;
import java.io.*;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.BufferedWriter;
import java.io.BufferedReader;
import java.io.DataOutputStream;
public class People{
//服务端ippublic  String ip = "127.0.0.1";//服务端端口public  int port = 5000;public  DataOutputStream output = null;public  Socket socket = null;public  DataInputStream input = null;public  Scanner sc =new Scanner (System.in);public  String send ;public  String receive;public  String name;public String sd = null;public static void main(String[]aa){People po = new People();po.start();}public void start(){try{System.out.println("*******欢迎使用匿名聊天室！**********");System.out.println("请输入你将要使用的昵称：");name=sc.nextLine();//获取昵称socket = new Socket(ip,port);output=new DataOutputStream(socket.getOutputStream());input = new DataInputStream(socket.getInputStream());send = name+"&)start";//把昵称发送到server 告诉所有人有新成员加入聊天室System.out.println("(如果要退出聊天室请输入“3333”！)");System.out.println("*******成功进入匿名聊天室！**********");System.out.println("");encryptWrite(send,output);Out out=new Out(output,name,input,socket);out.start();//启动发送聊天内容的多线程while(true){    String receive = readDecrypt(input);if("3333".equals(receive)){//如果收到“3333”则退出聊天室System.out.println("*******成功退出匿名聊天室！**********");input.close();output.close();socket.close();System.exit(0);}System.out.println(receive);}}catch(Exception ex){ex.printStackTrace();}finally{try{if(socket!=null) socket.close();input.close();output.close();}catch(Exception ex){ex.printStackTrace();}}    }public void encryptWrite(String src,DataOutputStream output)throws IOException{//将一个字符串转化为字符数组char[] char_arr = src.toCharArray();//加密操作for(int i = 0;i<char_arr.length;i++){output.writeChar(char_arr[i]+13);}//用作结束标志符output.writeChar(2333);output.flush();}//读取并解密public String readDecrypt(DataInputStream input)throws IOException{String rtn="";while(true){int char_src =input.readChar();if(char_src!=2333){rtn=rtn+(char)(char_src-13);}else{break;}}return rtn;}
}
class Out extends Thread {public DataOutputStream output;public DataInputStream input;public static String name;public Socket socket;public  Scanner sc =new Scanner (System.in);Out(DataOutputStream ot,String n,DataInputStream it,Socket socket){output=ot;input=it;name=n;}public void run(){People po = new People();try{while(true){String send=sc.nextLine();//获取用户输入String send2=name+"&"+send;//把聊天内容打包成约定形式po.encryptWrite(send2,output);}}catch(Exception ex){ex.printStackTrace();}finally{System.out.println("sfef");}}
}

结果