[英]Multithreaded client server chat application in java
我正在尝试用Java编写多线程客户端服务器聊天应用程序。 我只想创建两个线程，从每个线程发送一些数字，然后从服务器获取相同的数字。 但是出了点问题。 客户端仅从一个线程发送数字，而服务器不返回所有数字
这是客户代码
import java.io.*;
import java.net.*;
public class Client implements Runnable{
private Socket clientSocket = null;
private DataInputStream input = null;
private PrintStream output = null;
private DataInputStream inputLine = null;
private int id;
public Client(int id){
this.id = id;
}
public static void main(String[] args) throws IOException, InterruptedException {
System.out.println("The client started. Type any text. To quit it type 'Ok'.");
Client a = new Client(1);
Thread one = new Thread(a);
Client b = new Client(2);
Thread two = new Thread(b);
one.start();
two.start();
one.join();
two.join();
}
public void run() {
System.out.println("hi from thread" + id);
try {
clientSocket = new Socket("localhost", 4444);
output = new PrintStream(clientSocket.getOutputStream());
input = new DataInputStream(clientSocket.getInputStream());
inputLine = new DataInputStream(new BufferedInputStream(System.in));
}
catch( IOException e){
System.out.println(e);
}
String responseLine;
try{
for(int i = 0; i < 10; i++){
output.println( id + " " + i);
System.out.println("sended:" + id + " " + i);
responseLine = input.readLine();
System.out.println("received: " + responseLine);
}
}
catch (IOException e) {
System.out.println(e);
}
}
}
和服务器代码
import java.io.*;
import java.net.*;
public class Server implements Runnable{
private static ServerSocket MyService = null;
private DataInputStream input = null;
private PrintStream output = null;
private String line;
private static Socket serviceSocket = null;
public static void main(String[] args) throws IOException {
try{
MyService = new ServerSocket(4444);
if(args.length > 0){
MyService = new ServerSocket(Integer.parseInt(args[0]));
}
}
catch( IOException e){
System.out.println("Couldn't linputten to port " + (args.length > 0 ? Integer.parseInt(args[0]) : 4444));
}
System.out.println("The server started. To stop it press <CTRL><C>.");
while(true){
try {
serviceSocket = MyService.accept();
new Thread(new Server()).start();
System.out.println("CREATED");
}
catch (IOException e) {
System.out.println("can't accept");
}
}
}
public void run(){
try {
input = new DataInputStream(serviceSocket.getInputStream());
output = new PrintStream(serviceSocket.getOutputStream());
while (true) {
line = input.readLine();
System.out.println("from client:" + line+"\n");
output.println("From server: " + line+"\n");
}
}
catch(IOException e) {
System.out.println(e);
}
}
}
每个新客户端都应位于服务器端的单独Thread上，您要为serviceSocket分配一个new Socket ，这样您就基本上会忽略以前连接的客户端。
您启动一个new Server而不是为刚刚连接的客户端启动一个Thread 。 您应该为每个连接的客户端创建一个new Socket ，并在连接客户端后在不启动new Server的new Thread上运行它。
UPDATE
这是基本的多客户端服务器的示例：
服务器代码由几个类组成：
// Server.java
public class Server {
private ServerSocket socket;
private ConnectionListener connectionListener;
// temp
private List<Client> clientList = new ArrayList<Client>();
// temp end
public Server(int port) {
try {
socket = new ServerSocket(port);
} catch (IOException e) {
e.printStackTrace();
}
connectionListener = new ConnectionListener(this);
}
public void start() throws IOException {
connectionListener.start();
// temp will move to a Thread later
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
String input;
while (((input = stdIn.readLine()) != null) && connectionListener.isAlive()) {
if (input.equalsIgnoreCase("exit")) {
break;
} else {
for (int i = 0; i < input.length(); i++)
System.out.print("\b");
System.out.println("Admin: " + input);
for (Client c : clientList) {
c.send("Admin: " + input);
}
}
}
stop();
// temp end
}
public void stop() {
connectionListener.stop();
for (Client c : clientList) {
c.closeSession();
}
System.out.println("Server terminated!");
}
public synchronized void addConnection(Connection connection) {
Client c = new Client(connection, clientList);
clientList.add(c);
c.startSession();
System.out.println("Client connected");
}
public ServerSocket getSocket() {
return socket;
}
public static void main(String[] args) throws IOException {
int port;
if (args.length > 0)
port = Integer.parseInt(args[0]);
else
port = 4444;
Server s = new Server(port);
s.start();
}
}
// ConnectionListener.java
public class ConnectionListener implements Runnable {
private Server server;
private ServerSocket socket;
private boolean running;
private Thread t;
public ConnectionListener(Server server) {
this.server = server;
this.socket = server.getSocket();
running = false;
}
public synchronized void start() {
if (running)
return;
running = true;
t = new Thread(this);
t.start();
}
public synchronized void stop() {
if (!running)
return;
System.out.print("Terminating connection listener on:" + socket.getLocalSocketAddress() + "...");
running = false;
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
t.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("TERMINATED!");
}
@Override
public void run() {
System.out.println("Listening for connections on: " + socket.getLocalSocketAddress());
try {
while (running) {
Socket request = socket.accept();
Connection connection = new Connection(request);
server.addConnection(connection);
}
} catch (IOException e) {
//e.printStackTrace();
}
}
public boolean isAlive() {
return running;
}
}
// Connection.java
public class Connection {
private Socket socket;
private BufferedReader in;
private BufferedWriter out;
private boolean alive;
public Connection(Socket socket) {
this.socket = socket;
try {
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
} catch (IOException e) {
e.printStackTrace();
}
alive = true;
}
public String read() {
try {
if (in.ready()) {
return in.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public void write(String data) {
try {
out.write(data);
} catch (IOException e) {
e.printStackTrace();
}
}
public void flush() {
try {
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
public boolean close() {
boolean result = true;
try {
in.close();
out.close();
socket.close();
alive = false;
} catch (IOException e) {
e.printStackTrace();
result = false;
}
return result;
}
public boolean isAlive() {
return alive;
}
}
// Client.java
/*
* This is still server side, that is the handler for the connected clients
*/
public class Client implements Runnable {
public static final long IDLE_TIME = 10;
private Connection connection;
private boolean alive;
private Thread t;
private List<Client> clientList;
public Client(Connection connection, List<Client> clientList) {
this.connection = connection;
this.clientList = clientList;
alive = false;
}
public synchronized void startSession() {
if (alive)
return;
alive = true;
t = new Thread(this);
t.start();
}
public synchronized void closeSession() {
if (!alive)
return;
alive = false;
try {
connection.close();
t.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void run() {
while (connection.isAlive()) {
String in = connection.read();
if (in != null) {
System.out.println(in);
for (Client c : clientList) {
c.send(in);
}
} else {
try {
Thread.sleep(IDLE_TIME);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public void send(String msg) {
connection.write(msg + "\n");
connection.flush();
}
}
和客户端示例：
// Client.java
public class Client {
public static void main(String[] args) {
String host;
if (args.length > 0)
host = args[0];
else
host = "localhost";
int port;
if (args.length > 1)
port = Integer.parseInt(args[1]);
else
port = 4444;
try (Socket socket = new Socket(host, port);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in))) {
Thread input = new Thread(() -> {
String msg;
try {
while ((msg = in.readLine()) != null) {
System.out.println(msg);
}
} catch (Exception e) {
e.printStackTrace();
}
});
input.start();
String userName = "User" + ((int) (Math.random() * 200));
String msg;
try {
while ((msg = stdIn.readLine()) != null) {
for (int i = 0; i < msg.length(); i++)
System.out.print("\b");
out.write(userName + ": " + msg + "\n");
out.flush();
}
} catch (Exception e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
这不是最好的例子，但我希望您可以使用它并根据需要进行调整。
寻找带有数据库教程的 Java 多线程客户端-服务器聊天应用程序
[英]Looking for Java Multithreaded Client-Server chat application with database tutorial
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