Question

如何使用Socket编程将文件列表从服务器发送到客户端。我使用过DataOutputStream和PrintWriter，它们都只向Client返回一个文件名。我知道'\ n'中存在一些问题。但无法解决它。等待专家建议......谢谢。

客户端

switch (choice) {

.......

  case 2: // for viewing files in the client's directory
  Socket mysocket = new Socket("localhost", 6103);
  String user_name = username;
  DataOutputStream outToServer2= new DataOutputStream(mysocket.getOutputStream());
  outToServer2.writeBytes(user_name + '\n');
  BufferedReader inFromServer2 = new BufferedReader(newInputStreamReader(mysocket.getInputStream()));
  String list = inFromServer2.readLine();
  System.out.println("FROM SERVER - LIST OF FILES:" + list);

  break;

}

.......

服务器

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

class DirList
{
   public static void main(String argv[]) throws Exception
      {
         String clientSentence;
         String capitalizedSentence;
         ServerSocket welcomeSocket = new ServerSocket(6103);

         while(true)
         {
            Socket connectionSocket = welcomeSocket.accept();
            BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
            PrintWriter outToClient = new PrintWriter(connectionSocket.getOutputStream(),true);
            clientSentence = inFromClient.readLine();
            System.out.println("Received view files request from user: " + clientSentence);
            String path = "/home/user/Files/";
            String userdir = path + clientSentence;
            String text="";
            String capitalizedSentence1;
            File f = new File(userdir);
                File[] listOfFiles = f.listFiles();
                for (int j = 0; j < listOfFiles.length; j++) {
                        if (listOfFiles[j].isFile()) {
                                text = listOfFiles[j].getName();
                                outToClient.println(text);
                                System.out.print(text+' ');

                   }
                }


         }
      }
}

Answer 1

您需要刷新服务器的输出：

outToClient.flush();

此外，在您的客户端中，您需要将读取放在循环中以消耗所有输出：

String line = null;
while ((line = inFromServer2.readLine()) != null) {
   System.out.println(line);
}

Answer 2

尝试使用“\ r \ n”。它可能会解决您的问题。

在Java Socket编程中从Server发送文件列表到客户端 - PrintWriter无法发送？

2 个答案: