[英]Trouble with simple java socket and thread program
我正在尝试学习如何在Java中与套接字一起使用线程。 我有一个非常简单的程序。 它的功能是让用户输入一个字符串,并使套接字在线程内部运行的服务器接收并打印该消息。 我得到它打印出“建立连接!” 并接受用户的输入,但它们似乎从未打印出来。 为什么没有将收到的消息不打印到控制台的某些原因?
这是Client类:
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;
public class Client {
public static void main(String[] args) throws IOException {
InetAddress host = InetAddress.getLocalHost();
TCPServer newServer = new TCPServer(5001);
Thread thread = new Thread(newServer);
thread.start();
Socket socket = new Socket(host,5001);
String outgoing_message = "";
Scanner scan = new Scanner(System.in);
PrintWriter printer = new PrintWriter(socket.getOutputStream());
while(!outgoing_message.equals("close")) {
System.out.print("Enter message: ");
outgoing_message = scan.nextLine();
printer.println(outgoing_message);
}
socket.close();
}
}
这是TCPServer类:
package Package_Two;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
public class TCPServer implements Runnable{
private Socket socket;
private ServerSocket serverSocket;
public TCPServer(int port) throws IOException{
this.serverSocket = new ServerSocket(port);
}
@Override
public void run(){
try {
this.socket = serverSocket.accept();
System.out.println("Connection established!");
Scanner scan = new Scanner(socket.getInputStream());
String incoming_message = "";
while(!incoming_message.equals("close")){
incoming_message = scan.nextLine();
System.out.println("Received message: " + incoming_message);
}
socket.close();
}
catch(IOException iex){
iex.printStackTrace();
}
}
}
如果看一下您使用的PrintWriter
构造函数的源代码,您会发现它使用autoFlush = false
调用了另一个构造函数。
我想,您应该将其更改为:
PrintWriter printer = new PrintWriter(socket.getOutputStream(), true);
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