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客户端.java

package Client;

import java.io.*;
import java.net.*;

class Client {
        /*
     To send string to server use "out.print(data)"
     To use info sent from server use "in.readLine()"
     */
    int port = 1234;
    String hostname = "localhost";
    String input,output;

    public void send(String text) {
    try {
         Socket skt = new Socket(hostname, port);           /*Connects to server*/

         BufferedReader in = new BufferedReader(new
         InputStreamReader(skt.getInputStream()));          /*Reads from server*/
         System.out.println("Server:" + in.readLine());

         PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
         out.print(text);                                   /*Writes to server*/

         skt.close();
         out.close();    /*Closes all*/
         in.close();
      }

      catch(Exception e) {
         System.out.print("Error Connecting to Server\n");
      } 
    }
   public static void main(String args[]) {
     Client c = new Client();
     c.send("Server is online");    //sends message to server
   }
}

服务器.java

package Server;

import java.io.*;
import java.net.*;

class Server {
    /*
     To send string to client use "out.print(data)"
     To use info sent from client use "in.readLine()"
     */
        int port = 1234;
    String input,output;

    public void send(String text) {
    try {
         ServerSocket srvr = new ServerSocket(port);
         Socket skt = srvr.accept();                    /*Waiting for Connection from client*/
         System.out.print("Server has connected!\n");

         PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
         out.print(text);                                                  /*Write/Send to Client*/

          BufferedReader in = new BufferedReader(new
            InputStreamReader(skt.getInputStream()));                   /*Read from Client*/
         System.out.println("Client:" + in.readLine());

         out.close();
         in.close();
         skt.close();               /*Closes all*/
         srvr.close();
      } catch( Exception e) {
         System.out.print("Error Connecting\n");
      } 
    }

   public static void main(String args[]) {
       Server s = new Server();
       s.send("Client is online");  //sends a message to client

   }
}

Server has connected! 当我从服务器和客户端发送时，为什么除了任何 事情都没有发生

s.send("X is online");

哪个应该在另一边阅读并在cmd中打印出来？

（是不是因为 bufferreader 在 printwriter 之后被激活并且没有拾取它？如果是这样我该如何解决这个问题？）

4

3 回答 3

3

BufferedReader#readLine除非您发送换行符，否则您的通话将无限期阻塞。代替

out.print(text);

和

out.println(text);

匹配BufferedReader#readLine来自客户端和服务器的调用。

于 2013-03-30T17:43:04.050 回答
2

一种可能性 - 看看这里的顺序：

 PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
 out.print(text);

 skt.close();
 out.close();

在关闭writer之前，您正在关闭套接字。这意味着如果写入器有任何缓冲数据，它就没有机会写入它。尝试切换关闭事物的顺序 -最后关闭套接字。

（通常你会把这些放在一个finally街区里，请注意......）

编辑：然后我注意到您没有在服务器端打印一行。您应该同时进行这两项更改。

于 2013-03-30T17:40:09.113 回答
1 
package client;

import java.io.*;
import java.net.*;

class Client {
        /*
     To send string to server use "out.print(data)"
     To use info sent from server use "in.readLine()"
     */
    int port = 1234;
    String hostname = "localhost";
    String input,output;

    public void send(String text) {
    try {
         Socket skt = new Socket(hostname, port);           /*Connects to server*/

         BufferedReader in = new BufferedReader(new
         InputStreamReader(skt.getInputStream()));          /*Reads from server*/
         System.out.println("Server:" + in.readLine());

         PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
         out.println(text);                                   /*Writes to server*/
         out.close();    /*Closes all*/
         in.close();
         skt.close();

      }

      catch(Exception e) {
         System.out.print("Error Connecting to Server\n");
      } 
    }
   public static void main(String args[]) {
     Client c = new Client();
     c.send("Server is online");    //sends message to server
   }
}
package server;

import java.io.*;
import java.net.*;

class Server {
    /*
     To send string to client use "out.print(data)"
     To use info sent from client use "in.readLine()"
     */
        int port = 1234;
    String input,output;

    public void send(String text) {
    try {

        ServerSocket srvr = new ServerSocket(port);
         Socket skt = srvr.accept();                    /*Waiting for Connection from client*/
         System.out.println("Server has connected!\n");

         PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
         out.println(text);                                                  /*Write/Send to Client*/

          BufferedReader in = new BufferedReader(new
            InputStreamReader(skt.getInputStream()));                   /*Read from Client*/
         System.out.println("Client:" + in.readLine());

       out.close();
         in.close();
         skt.close();              /*Closes all*/
        srvr.close();
      } catch( Exception e) {
         System.out.print("Error Connecting\n");
      } 
    }

   public static void main(String args[]) {
       Server s = new Server();
       s.send("Client is online");  //sends a message to client

   }
}

上面的代码对我有用看看你是否遗漏了什么

于 2013-03-30T18:07:07.270 回答