Java 编写点对点聊天系统时遇到问题
这是我得到的问题陈述: 设计一个协议,其中一个服务器负责匹配两个chatt客户端。服务器在TCP端口上侦听即将到来的连接。 如果尚未将任何客户端连接到要配对的服务器,则服务器将接受连接的客户端,并使其等待另一个客户端。为此,它向连接客户端发送一条消息等待。接收此命令时,客户端构造另一个服务器套接字实例以侦听端口。然后,客户端向服务器发送一个MESAGE,其中包含新创建的服务器侦听的端口号。 当另一个客户端C2在C1等待时寻求与服务器的连接时,服务器通过向C2发送消息“PEER_LOC$h:$p”通知C2存在C1,其中$h是C1的主机名(或IP地址),而$p是C1等待的端口号。C2收到此消息后,它使用获得的信息寻找到C1的连接。客户端从用户处获取消息。然后,这两个客户端交换消息,直到任何一方发送流的末尾”(Linux中的Ctrl-D)。然后终止它们的保存。复杂的方法可能会使用多个线程、超时等,在这个问题中不需要 我的问题是将两个客户端连接到我的服务器。我运行我的服务器程序,然后运行另外两个客户机类,它们彼此重复,只是名称不同。我只能连接到其中一个,而另一个似乎永远在等待 这些是我的课程,我运行 服务器:Java 编写点对点聊天系统时遇到问题,java,multithreading,sockets,Java,Multithreading,Sockets,这是我得到的问题陈述: 设计一个协议,其中一个服务器负责匹配两个chatt客户端。服务器在TCP端口上侦听即将到来的连接。 如果尚未将任何客户端连接到要配对的服务器,则服务器将接受连接的客户端,并使其等待另一个客户端。为此,它向连接客户端发送一条消息等待。接收此命令时,客户端构造另一个服务器套接字实例以侦听端口。然后,客户端向服务器发送一个MESAGE,其中包含新创建的服务器侦听的端口号。 当另一个客户端C2在C1等待时寻求与服务器的连接时,服务器通过向C2发送消息“PEER_LOC$h:$p”
package chatserver2;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
// import all the class that you will need for functionailty
// extends jframe to develop gui's in java
public class Server {
private static ObjectOutputStream output; // stream data out
private static ObjectInputStream input; // stream data in
private static ServerSocket server;
private static Socket connection; // socket means set up connetion between 2 computers
private static int n;
//Constructor
public static void main(String[] args) throws IOException {
Server obj = new Server();
obj.RunServer();
try {
while (true) {
Handler obj2 = new Handler();
obj2.start();
System.out.println("Accepted connection from "
+ connection.getInetAddress() + " at port "
+ connection.getPort());
n++;
System.out.println("Count " + n);
}
} finally {
connection.close();
}
}
public Server() {
}
// run the server after gui created
public void RunServer() {
try {
server = new ServerSocket(6789); // 1st number is port number where the application is located on the server, 2nd number is the amount of people aloud to connect
while (true) {
try {
waitForConnection(); // wait for a connection between 2 computers
setupStreams(); // set up a stream connection between 2 computers to communicate
whileChatting(); // send message to each other
// connect with someone and have a conversation
} catch (EOFException eofException) {
}
}
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
//Wait for a connection then display connection information
private void waitForConnection() {
try {
connection = server.accept();
} catch (IOException ioexception) {
ioexception.printStackTrace();
}
}
// stream function to send and recive data
private void setupStreams() throws IOException {
output = new ObjectOutputStream(connection.getOutputStream()); // set up pathway to send data out
output.flush(); // move data away from your machine
input = new ObjectInputStream(connection.getInputStream()); // set up pathway to allow data in
}
// this code while run during chat conversions
private void whileChatting() throws IOException {
String message = "WAIT ";
sendMessage(message);
do {
try {
message = (String) input.readObject(); // stores input object message in a string variable
System.out.println("Message from Client " + message);
} catch (ClassNotFoundException classnotfoundException) {
}
} while (!message.equals("CLIENT - END"));// if user types end program stops
}
private void closeChat() {
try {
output.close();
input.close();
connection.close();
} catch (IOException ioexception) {
ioexception.printStackTrace();
}
}
// send message to the client
private void sendMessage(String message) {
try {
output.writeObject(message);
output.flush();
System.out.println("Message to client " + message);
} catch (IOException ioexception) {
}
}
public static class Handler extends Thread {
private Socket connection;
public Handler() {
String message = "WAIT";
}
public void run() {
System.out.println("Connect" + Server.connection);
while (true) {
try {
waitForConnection();
setupStreams();
whileChatting();
} catch (IOException ex) {
Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
private void waitForConnection() {
System.out.println("server" + server);
try {
connection = server.accept();
} catch (IOException ioexception) {
ioexception.printStackTrace();
}
System.out.println("Connection" + connection);
}
private void setupStreams() throws IOException {
output = new ObjectOutputStream(connection.getOutputStream()); // set up pathway to send data out
output.flush(); // move data away from your machine
input = new ObjectInputStream(connection.getInputStream()); // set up pathway to allow data in
}
private void whileChatting() throws IOException {
String message = " You are now connected ";
sendMessage(message);
do {
try {
message = (String) input.readObject();
} catch (ClassNotFoundException classnotfoundException) {
}
} while (!message.equals("CLIENT - END"));
}
private void closeChat() {
try {
output.close();
input.close();
connection.close();
} catch (IOException ioexception) {
ioexception.printStackTrace();
}
}
static private void sendMessage(String message) {
try {
output.writeObject(message);
output.flush();
} catch (IOException ioexception) {
}
}
}
}
和一个重复的客户端类别C1或C2:
package chatserver2;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
// import all the class that you will need for functionailty
// extends jframe to develop gui's in java
public class Client1 extends JFrame {
private JTextField userInput; //
private JTextArea theChatWindow; //
private ObjectOutputStream output; // stream data out
private ObjectInputStream input; // stream data in
private Socket connection; // socket means set up connetion between 2 computers
//Constructor
public Client1() {
}
// run the server after gui created
public void RunClient() {
try {
connection = new Socket("localhost", 6789);// 1st number is port number where the application is located on the server, 2nd number is the amount of people aloud to connect
while (true) {
try {
// wait for a connection between 2 computers
setupStreams(); // set up a stream connection between 2 computers to communicate
whileChatting(); // send message to each other
// connect with someone and have a conversation
} catch (EOFException eofException) {
} finally {
closeChat();
}
}
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
//Wait for a connection then display connection information
// stream function to send and recive data
private void setupStreams() throws IOException {
output = new ObjectOutputStream(connection.getOutputStream()); // set up pathway to send data out
output.flush(); // move data away from your machine
input = new ObjectInputStream(connection.getInputStream()); // set up pathway to allow data in
}
// this code while run during chat conversions
private void whileChatting() throws IOException {
String message = "";
do {
// have conversion while the client does not type end
try {
message = (String) input.readObject(); // stores input object message in a string variable
System.out.println("message " + message);
if (message.equals("WAIT")) {
ServerSocket server2 = new ServerSocket(5000);
System.out.println("Hello");
message = "5000";
sendMessage(message);
}
System.out.println("From server " + message);
} catch (ClassNotFoundException classnotfoundException) {
}
} while (!message.equals("CLIENT - END"));// if user types end program stops
}
private void closeChat() {
try {
output.close(); // close output stream
input.close(); // close input stream
connection.close(); // close the main socket connection
} catch (IOException ioexception) {
ioexception.printStackTrace();
}
}
// send message to the client
private void sendMessage(String message) {
try {
output.writeObject(" - " + message);
output.flush(); // send all data out
} catch (IOException ioexception) {
theChatWindow.append("\n ERROR: Message cant send");
}
}
//
//
public static void main(String[] args) {
Client1 obj = new Client1();
obj.RunClient();
}
}
我可以连接到我运行的第一个客户端,第二个客户端将永远等待。
如果您有任何建议或意见,我们将不胜感激。您正在阻止服务器循环。您应该为客户端的每个连接启动新线程。我会在
RunServer
方法中将waitForConnection()
与服务器循环中的下游代码分离。因此,您的while循环应该如下所示:
public static void RunClient() {
...
while (true) {
try {
final Server srv = waitForConnection(); // wait for a connection between 2 computers
new Thread(new Runnable() {
public void run() {
try {
srv.setupStreams(); // set up a stream connection between 2 computers to communicate
srv.whileChatting(); // send message to each other
// connect with someone and have a conversation
} catch (EOFException ex) {
// ex.printStackTrace();
}
}
}).start();
} catch (EOFException eofException) {
}
}
在这种情况下,您必须为每个客户端创建服务器实例,并且您的服务器声明应包含与客户端相关的非静态道具,如:
public class Server {
private ObjectOutputStream output; // stream data out
private ObjectInputStream input; // stream data in
private static ServerSocket server;
private Socket connection; // socket means set up connetion between 2 computers
...
服务器的创建应该在waitForConnection()内部进行,比如:
private static Server waitForConnection() {
try {
Socket connection = server.accept();
return new Server(connection);
} catch (IOException ioexception) {
ioexception.printStackTrace();
}
}
这不是唯一的方法。您可以保留负责在同一实例中运行主循环的服务器类。但在本例中,我将创建一些与来自特定客户端的连接(连接、输入、输出)相关的附加类处理属性。您正在阻止服务器循环。您应该为客户端的每个连接启动新线程。我会在RunServer
方法中将waitForConnection()
与服务器循环中的下游代码分离。因此,您的while循环应该如下所示:
public static void RunClient() {
...
while (true) {
try {
final Server srv = waitForConnection(); // wait for a connection between 2 computers
new Thread(new Runnable() {
public void run() {
try {
srv.setupStreams(); // set up a stream connection between 2 computers to communicate
srv.whileChatting(); // send message to each other
// connect with someone and have a conversation
} catch (EOFException ex) {
// ex.printStackTrace();
}
}
}).start();
} catch (EOFException eofException) {
}
}
在这种情况下,您必须为每个客户端创建服务器实例,并且您的服务器声明应包含与客户端相关的非静态道具,如:
public class Server {
private ObjectOutputStream output; // stream data out
private ObjectInputStream input; // stream data in
private static ServerSocket server;
private Socket connection; // socket means set up connetion between 2 computers
...
服务器的创建应该在waitForConnection()内部进行,比如:
private static Server waitForConnection() {
try {
Socket connection = server.accept();
return new Server(connection);
} catch (IOException ioexception) {
ioexception.printStackTrace();
}
}
这不是唯一的方法。您可以保留负责在同一实例中运行主循环的服务器类。但在本例中,我将创建一些与特定客户机的连接(连接、输入、输出)相关的附加类处理属性。这可能有助于您理解其本质,也可能没有,我真的不知道
我
这可能有助于你把它带到本质上来,也可能没有,我真的不知道
我
更改静态成员会破坏代码。我在main方法中引用了连接变量。您的第一个建议是,在客户端或服务器中,RunClient在客户端类中?我是否必须以任何方式更改嵌套的内部类处理程序?我很新,这是正确的方法吗?更改静态成员会破坏我的代码。我在main方法中引用了连接变量。您的第一个建议是,在客户端或服务器中,RunClient在客户端类中?我是否必须以任何方式更改嵌套的内部类处理程序?我很新,这是正确的方法吗?主类看起来会是什么样?我必须更改这么多。在我的服务器类中,我有一个内部类,这是必要的吗?主类看起来会是什么样子?我必须改变这么多。在我的服务器类中,我有一个内部类,这是必要的吗?