Java中带套接字的多线程服务器和客户端
我正在尝试为一个大学项目创建一个服务器/从机/客户端项目。 服务器应打开2个端口,一个端口用于连接从机,另一个端口用于连接客户端Java中带套接字的多线程服务器和客户端,java,multithreading,client-server,Java,Multithreading,Client Server,我正在尝试为一个大学项目创建一个服务器/从机/客户端项目。 服务器应打开2个端口,一个端口用于连接从机,另一个端口用于连接客户端 public class Client { private static final int NUMBERS = 50; private static final int AMPLITUDE = 100; private static int masterPort; public Client(int port) { this.masterPort = po
public class Client {
private static final int NUMBERS = 50;
private static final int AMPLITUDE = 100;
private static int masterPort;
public Client(int port) {
this.masterPort = port;
}
public static void main(String[] args) throws IOException{
String serverHostname = "127.0.0.1";
System.out.println("Αναμονή για σύνδεση στον σέρβερ " + serverHostname + " στην πόρτα 30091.");
Socket echoSocket = null;
BufferedReader in = null;
try {
echoSocket = new Socket(serverHostname, 18889);
in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Δεν μπορεί να πραγματοποιηθεί σύνδεση με τον σέρβερ: " + serverHostname);
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: " + serverHostname);
System.exit(1);
}
ClientOut clientOut = new ClientOut(echoSocket);
clientOut.start();
ClientIn clientIn = new ClientIn(in);
clientIn.start();
in.close();
echoSocket.close();
}
public static class ClientOut extends Thread {
private PrintWriter out;
public ClientOut(Socket echoSocket) throws IOException {
this.out = new PrintWriter(echoSocket.getOutputStream(), true);
}
@Override
public void run() {
System.out.println("Ο client συνδέθηκε!");
Random rnd = new Random();
try {
for (int i=0; i<NUMBERS; i++) {
int num = rnd.nextInt(AMPLITUDE);
System.out.println(num);
out.println(num);
TimeUnit.SECONDS.sleep(1);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
out.close();
}
}
public static class ClientIn extends Thread {
private BufferedReader in;
public ClientIn(BufferedReader in) {
this.in = in;
}
@Override
public void run() {
}
}
}
public class Master {
private int slavePort;
private int clientPort;
private SlaveThread slaveThread;
private ClientThread clientThread;
private boolean running = false;
public static int slaveConnected; // Slave connection counter
public Master(int slavePort, int clientPort) {
this.slavePort = slavePort;
this.clientPort = clientPort;
this.slaveConnected = 0;
public void startServer() {
try {
this.slaveThread = new SlaveThread(slavePort);
this.clientThread = new ClientThread(clientPort);
System.out.println( "Αναμονή για σύνδεση client / slave" );
slaveThread.start();
clientThread.start();
} catch (IOException e) {
e.printStackTrace();
}
}
public void stopServer() {
running = false;
this.slaveThread.interrupt();
this.clientThread.interrupt();
}
class SlaveThread extends Thread {
private ServerSocket slaveSocket;
SlaveThread(int slavePort) throws IOException {
this.slaveSocket = new ServerSocket(slavePort);
}
@Override
public void run() {
running = true;
while (running) {
try {
// Call accept() to receive the next connection
Socket slSocket = slaveSocket.accept();
System.out.println("Δημιουργήθηκε μια νέα σύνδεση Slave");
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
class ClientThread extends Thread {
private ServerSocket clientSocket;
ClientThread(int clientPort) throws IOException {
this.clientSocket = new ServerSocket(clientPort);
}
@Override
public void run() {
running = true;
while (running) {
try {
Socket clSocket = clientSocket.accept();
BufferedReader in = new BufferedReader(new InputStreamReader(clSocket.getInputStream()));
System.out.println("Δημιουργήθηκε μια νέα σύνδεση Client");
String inputLine;
while ((inputLine = in.readLine()) != null) {
System.out.println("Client: " + inputLine);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
Master server = new Master( 30091, 18889);
server.startServer();
// Automatically shutdown in 1 minute
try {
Thread.sleep( 60000 );
} catch(Exception e) {
e.printStackTrace();
}
server.stopServer();
}
我设置了两个线程,一个用于客户端,另一个用于从机。客户端应向服务器发送随机数,服务器应将这些随机数转发给从属实例。从属服务器应检查其列表中是否存在当前号码,以及是否无法存储该号码,否则应向服务器发送一条消息,说明该号码已存在
然后我创建了客户端线程,它由两个线程组成,一个用于向服务器发送数字,另一个用于读取来自服务器的消息。
PrintWriter的代码有问题,当代码在线程中时,我无法将数字发送到服务器。如果我移动主线程上的代码并取消线程,消息将被发送而不会出现任何问题。
这会是什么问题
下面是服务器主机和客户端的当前代码
public class Client {
private static final int NUMBERS = 50;
private static final int AMPLITUDE = 100;
private static int masterPort;
public Client(int port) {
this.masterPort = port;
}
public static void main(String[] args) throws IOException{
String serverHostname = "127.0.0.1";
System.out.println("Αναμονή για σύνδεση στον σέρβερ " + serverHostname + " στην πόρτα 30091.");
Socket echoSocket = null;
BufferedReader in = null;
try {
echoSocket = new Socket(serverHostname, 18889);
in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Δεν μπορεί να πραγματοποιηθεί σύνδεση με τον σέρβερ: " + serverHostname);
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: " + serverHostname);
System.exit(1);
}
ClientOut clientOut = new ClientOut(echoSocket);
clientOut.start();
ClientIn clientIn = new ClientIn(in);
clientIn.start();
in.close();
echoSocket.close();
}
public static class ClientOut extends Thread {
private PrintWriter out;
public ClientOut(Socket echoSocket) throws IOException {
this.out = new PrintWriter(echoSocket.getOutputStream(), true);
}
@Override
public void run() {
System.out.println("Ο client συνδέθηκε!");
Random rnd = new Random();
try {
for (int i=0; i<NUMBERS; i++) {
int num = rnd.nextInt(AMPLITUDE);
System.out.println(num);
out.println(num);
TimeUnit.SECONDS.sleep(1);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
out.close();
}
}
public static class ClientIn extends Thread {
private BufferedReader in;
public ClientIn(BufferedReader in) {
this.in = in;
}
@Override
public void run() {
}
}
}
public class Master {
private int slavePort;
private int clientPort;
private SlaveThread slaveThread;
private ClientThread clientThread;
private boolean running = false;
public static int slaveConnected; // Slave connection counter
public Master(int slavePort, int clientPort) {
this.slavePort = slavePort;
this.clientPort = clientPort;
this.slaveConnected = 0;
public void startServer() {
try {
this.slaveThread = new SlaveThread(slavePort);
this.clientThread = new ClientThread(clientPort);
System.out.println( "Αναμονή για σύνδεση client / slave" );
slaveThread.start();
clientThread.start();
} catch (IOException e) {
e.printStackTrace();
}
}
public void stopServer() {
running = false;
this.slaveThread.interrupt();
this.clientThread.interrupt();
}
class SlaveThread extends Thread {
private ServerSocket slaveSocket;
SlaveThread(int slavePort) throws IOException {
this.slaveSocket = new ServerSocket(slavePort);
}
@Override
public void run() {
running = true;
while (running) {
try {
// Call accept() to receive the next connection
Socket slSocket = slaveSocket.accept();
System.out.println("Δημιουργήθηκε μια νέα σύνδεση Slave");
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
class ClientThread extends Thread {
private ServerSocket clientSocket;
ClientThread(int clientPort) throws IOException {
this.clientSocket = new ServerSocket(clientPort);
}
@Override
public void run() {
running = true;
while (running) {
try {
Socket clSocket = clientSocket.accept();
BufferedReader in = new BufferedReader(new InputStreamReader(clSocket.getInputStream()));
System.out.println("Δημιουργήθηκε μια νέα σύνδεση Client");
String inputLine;
while ((inputLine = in.readLine()) != null) {
System.out.println("Client: " + inputLine);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
Master server = new Master( 30091, 18889);
server.startServer();
// Automatically shutdown in 1 minute
try {
Thread.sleep( 60000 );
} catch(Exception e) {
e.printStackTrace();
}
server.stopServer();
}
我找到了解决办法。
套接字应该在客户端线程构造函数上创建,而不是作为引用传递。
所以客户应该
public class Client {
private static final int NUMBERS = 50;
private static final int AMPLITUDE = 100;
private static int masterPort;
public Client(int port) {
this.masterPort = port;
}
public static void main(String[] args) throws IOException{
String serverHostname = "127.0.0.1"; //Ορίζουμε την διεύθυνση που είναι ο σέρβερ
System.out.println("Αναμονή για σύνδεση στον σέρβερ " + serverHostname + " στην πόρτα 30091.");
ClientOut clientOut = new ClientOut(serverHostname);
clientOut.start();
ClientIn clientIn = new ClientIn(serverHostname);
clientIn.start();
}
public static class ClientOut extends Thread {
private Socket echoSocket;
private PrintWriter writer;
ClientOut(String serverHostname) throws IOException {
this.echoSocket = new Socket(serverHostname, 18889);
this.writer = new PrintWriter(echoSocket.getOutputStream(), true);;
}
@Override
public void run() {
System.out.println("Ο client συνδέθηκε!");
Random rnd = new Random();
try {
for (int i=0; i<NUMBERS; i++) {
int num = rnd.nextInt(AMPLITUDE);
System.out.println(num);
writer.println(num);
TimeUnit.SECONDS.sleep(1);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
writer.close();
}
}
您调用了“out.close”,因此套接字服务器已顺利关闭。在将随机数从客户端发送到服务器后,是否要接收相同的数字?out.close在for循环之外,因为我将它保留在for循环内进行了许多更改。但这并不是问题的根源。在最好的情况下,我只从服务器获得第一个号码。我在调试器上注意到的是,PrintWriter有一个标志问题,这是真的,我不知道是什么导致了这种更改。您是否会提交代码并推送到GitHub,然后共享地址?我认为我们最好讨论一下代码和逻辑。你可以在关闭套接字时检查它,而线程仍在运行。解决方法:不要。当接收到流结束时,在读取线程中关闭它。这不是问题所在。现在,您正在浪费时间为每个逻辑连接创建两个套接字。我甚至尝试不关闭连接,只有在线程内创建套接字时,我才设法解决它。怎么可能解决呢?四天前,我已经在你的问题下的评论中告诉你了。