1
我想编写一个程序,允许用户发送消息到服务器并接收该消息的修改版本。出于某种原因,程序的流程停在了下面的某一行,我已经指出了这一点。任何人都可以解释为什么这不起作用吗?谢谢。Java客户端/服务器应用程序不会readLine()
服务器端
import java.net.*;
import java.io.*;
public class Server{
public final static int port = 1025;
public static void main (String[] args){
ServerSocket serverSocket;
Socket client;
PrintWriter output;
try{
serverSocket = new ServerSocket(port);
try{
while(true){
client = serverSocket.accept();
InputStream is = client.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String message = br.readLine();
System.out.println("Message received from client is " + message);
String returnMessage = message + message;
OutputStream os = client.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
bw.write(returnMessage);
System.out.println("Message sent to the client is " + returnMessage);
bw.flush();
}
} catch(IOException e){
serverSocket.close();
System.err.println(e);
}
} catch(IOException e){
System.err.println(e);
}
}
}
客户端
import java.util.Scanner;
import java.net.*;
import java.io.*;
class Client{
public void getService(String destination, int port){
try{
while(true)
{
Scanner in = new Scanner(System.in);
System.out.println("Send a message to the server: ");
String message = in.nextLine();
Socket server = new Socket(destination, port);
OutputStream os = server.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
String sendMessage = message + "\n";
bw.write(sendMessage);
bw.flush();
System.out.println("Message sent to the server : "+ sendMessage);
InputStream is = server.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String message2 = br.readLine(); // I have determined that the program's flow proceeds no further than this line
System.out.println("Message received from the server : " + message2);
}
} catch(IOException e){
e.printStackTrace();
}
}
public static void main(String[] args){
String serverAddress = args[0];
System.out.println(serverAddress);
Client client = new Client();
client.getService(serverAddress, 1025);
}
}