[英]Java - Client and Server communication issues
我正在尝试创建一个简单的Java聊天应用程序,但是遇到了一些问题。
这是下面两个类的代码:
Serveur.java:
import java.io.*;
import java.net.*;
class Serveur{
private String msgClient, msgServeur;
private ServerSocket serverSocket;
private DataOutputStream out;
private Socket socket;
private int port;
private BufferedReader in;
public Serveur() throws IOException{
System.out.println("Serveur OK...");
this.port = 21;
this.serverSocket = new ServerSocket(this.port);
while(true){
this.socket = serverSocket.accept();
this.in = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
this.out = new DataOutputStream(this.socket.getOutputStream());
this.msgClient = this.in.readLine();
System.out.println("Received: " + this.msgClient);
this.msgServeur = this.msgClient.toUpperCase() + '\n';
send(this.msgServeur);
}
}
public void send(String msg) throws IOException{
this.out.writeBytes(msg);
}
public static void main(String argv[]) throws Exception {
Serveur serveur = new Serveur();
}
}
Client.java:
import java.io.*;
import java.net.*;
class Client{
private String sentence;
private String modifiedSentence;
private int port;
private BufferedReader inUser;
private BufferedReader inServeur;
private Socket socket;
private DataOutputStream out;
public Client() throws UnknownHostException, IOException{
this.sentence = "";
this.modifiedSentence = "";
this.port = 21;
this.inUser = new BufferedReader(new InputStreamReader(System.in));
this.socket = new Socket("localhost", this.port);
this.out = new DataOutputStream(this.socket.getOutputStream());
this.inServeur = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
sentence = this.inUser.readLine();
this.out.writeBytes(sentence + '\n');
modifiedSentence = this.inServeur.readLine();
System.out.println("FROM SERVER: " + modifiedSentence);
this.socket.close();
}
public static void main(String argv[]) throws Exception{
Client client = new Client();
}
}
我有2个问题:
-客户端发送一条消息,服务器以大写形式返回相同的消息。 如何允许客户端发送消息而无需立即关闭其套接字连接?
-服务器看起来不错,但是当我有多个客户端时,有多个连接的客户端会发生什么变化吗? 我如何向特定的客户广播消息和消息?
客户端发送一条消息,服务器以大写形式返回相同的消息。 我如何允许客户端发送无限消息,并且在发送第一条消息后不破坏自身?
只是让客户使用循环
boolean quit = false;
while (!quit) {
sentence = this.inUser.readLine();
quit = sentence.trim().equals("quit");
this.out.writeBytes(sentence + '\n');
modifiedSentence = this.inServeur.readLine();
System.out.println("FROM SERVER: " + modifiedSentence);
}
this.socket.close();
服务器看起来还可以,但是当我有多个客户端时,多个客户端之间会有区别吗? 我该如何播放? 向重点客户发送消息?
是的,该服务器阻止读取第一个客户端,因此任何其他客户端都必须等待。 您可能希望将用于阻塞的代码放在单独的线程中,或将其提交给ExecutiveService。 而且,特定于客户端的所有变量都不能位于单个服务器类中,因为您需要为每个客户端设置一组变量。
while (true) {
final Socket socket = serverSocket.accept();
new Thread(() -> {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
boolean quit = false;
while (!quit) {
String msgClient = in.readLine();
quit = msgClient.trim().equals("quit");
System.out.println("Received: " + msgClient);
String msgServeur = msgClient.toUpperCase() + '\n';
out.writeBytes(msgServeur);
}
} catch (IOException e) {
e.printStackTrace();
}
}).start();
}
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