如何使用Java中的Sockets访问Client-Server体系结构中的文件？

本文介绍了如何使用Java中的Sockets访问Client-Server体系结构中的文件？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要读取放置在我的计算机上的虚拟机上的bdd.txt文件。我在Java做了一个客户端/服务器系统。我的Server.java是在我的VM（Ubuntu）与一个数据库（在同一文件夹中的bdd.txt文件），我的Client.java是在我的Windows 7。

I need to read a "bdd.txt" file placed on a Virtual Machine on my computer. I made a client/server system in Java. My Server.java is on my VM (Ubuntu) with a "database" (the bdd.txt file in the same folder), and my Client.java is on my Windows 7.

到目前为止，我已经将我的代码拆分为两个不同的文件（服务器/客户端），我建立了我的Windows 7和我的VMware Player的Ubuntu之间的连接。当我在我的VM上启动我的服务器，它侦听端口号x，然后我回到我的Windows并运行我的客户端。它要求建立连接，然后，回到我的VM，我打印一条消息连接已经建立，我的应用程序正在运行。所以现在我可以在他们之间沟通。我刚刚使用socket = new Socket（我的VM的IP地址，portNumber）;它的工作原理。但现在，我不知道如何适应我的代码，以达到我在我的虚拟机上移动的bdd.txt文件。

So far I have split my code into 2 different files (Server/Client) and I made the connexion between my Windows 7 and my VMware Player's Ubuntu. When I start my server on my VM, it listens on a port number x, then I go back on my Windows and run my client. It asks to make the connexion and then, back on my VM, I print a message "The connexion is made" and my app is running. So now I can communicate between them. I have just used socket = new Socket("my VM ip address",portNumber); and it works. But now, I have no idea how to adapt my code to reach my bdd.txt file I moved on my VM.

我现在如何读取bdd .txt文件，有权访问pin码？
为什么我的新客户端（）从未在我的程序中调用？

How can I now read the bdd.txt file, to have access to the pin codes ?Why is my new Client() never called in my program?

is Client.java：

Here is Client.java :

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
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 {

        int pinSize = 0;

          //set up server communication
          Socket clientSocket = new Socket(InetAddress.getLocalHost(),1234);
          BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
          PrintWriter out = new PrintWriter(clientSocket.getOutputStream());

          Scanner scanner = new Scanner(System.in);
          System.out.println("Enter pin : ");
          String password = scanner.next();
          pinSize = password.length();

          //send PIN to server
          out.println(password);

          if (pinSize != 4) { 
      System.out.println("Pin must be 4 digits");
    } else {
      System.out.println("Checking...");
    }

          out.flush();

          //get response from server
          String response = in.readLine();
          System.out.println(response);

          in.close();
          out.close();
          clientSocket.close();
        }
}

这里是Server.java bdd.txt）：

Here is Server.java (in the same folder as bdd.txt):

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;


public class Server {

    private static ServerSocket server;

    public static void main(String[] args) throws Exception {

          server = new ServerSocket(1234);
          Socket socket = server.accept();      
          BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
          PrintWriter out = new PrintWriter(socket.getOutputStream());

          //Listen for client requests:
          String request;
          while ((request = in.readLine()) != null) {

            //check PIN, send result
            boolean pinCorrect = checkPin(request);
            out.println(pinCorrect ? "yes" : "no");
            out.flush();
          }

          out.close();
          in.close();
          socket.close();
        }

        /**
         * Check if PIN is in bdd.txt
         * @throws IOException 
         */
        private static boolean checkPin(String pin) throws IOException {
          boolean result = false;
          File file = new File("bdd.txt");
          BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
          String line;
          while ((line = in.readLine()) != null) {
            result |= (line.equals(pin));
          }
          in.close();
          return result;
        }
}

推荐答案

以下是应该发生的情况：

Here's what should happen:

客户端：

用户输入一个号码

客户端将用户号码发送到服务器

客户端从服务器接收响应并显示

服务器端：

服务器侦听客户端连接

服务器从客户端接收号码

服务器检查文件 bbd.txt

如果文件中存在数字，则返回 yes else return no

Server listens for client connection
Server receives number from client
Server checks number against file bbd.txt
If number exists in file, return yes else return no

我写了一些简单的代码，不包括UI内容：

I have written some simple code to show you, excluding UI stuff:

Client.java：

Client.java:

public static void main(String[] args) {

  //set up server communication
  Socket clientSocket = new Socket("ip.address",1234);
  BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
  PrintWriter out = new PrintWriter(socket.getOutputStream());


  //send PIN to server
  out.println("9.8.7.6");
  out.flush;

  //get response from server
  String response = in.readLine();
  System.out.println(response);

  in.close();
  out.close();
  clientSocket.close();
}

Server.java：

Server.java:

public static void main(String[] args) throws Exception {

  //Set up client communication
  ServerSocket server = new ServerSocket(1234);
  Socket socket = server.accept();      
  BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
  PrintWriter out = new PrintWriter(socket.getOutputStream());

  //Listen for client requests:
  String request;
  while ((request = in.readLine()) != null) {

    //check PIN, send result
    boolean pinCorrect = checkPin(request);
    out.println(pinCorrect ? "yes" : "no");
    out.flush();
  }

  out.close();
  in.close();
  socket.close();
}

/**
 * Check if PIN is in bdd.txt
 */
private static boolean checkPin(String pin) {
  boolean result = false;
  File file = new File("bdd.txt");
  BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
  String line;
  while ((line = in.readLine()) != null) {
    result |= (line.equals(pin));
  }
  in.close();
  return result;
}

这篇关于如何使用Java中的Sockets访问Client-Server体系结构中的文件？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！