Java文件传输文件到服务器 [英] Java file transfer file to server

问题描述

我是Java网络新手，已经找了一段时间解决我的问题了，我想为什么不在这个问题上向一些更有资格的人提出一些建议呢？

I am new to Java networking, and having looked for a resolution for my problem for a while now, I figured why not ask some advice from some more qualified people on this matter?

我目前已经制作了一个管理我的服务器的小工具，以及另一个小客户端工具。我的目标是使该工具能够从客户端向服务器计算机发送命令。这样我就可以在另一台机器上对服务器计算机执行某些操作，包括发送带有更新文件的zip存档。

I currently have made a small tool which manages a server of mine, and another small client tool. My goal is for the tool to be able to send commands from the client to the server computer. This way I can perform certain actions on the server computer from another machine, including sending a zip archive with updated files.

我有基本设置：发送的TCP连接从客户端到服务器的命令（服务器回复确认）然后我希望发生所谓的操作。我现在的问题是：

I have the basics setup: a TCP connection that sends a command from client to server (server replies with a confirmation) and then I would like the supposed action to take place. My question now is this:

当从客户端向服务器发送文件（.zip）时，我应该通过TCP发送它还是使用类似FTP的东西？我不仅希望将文件发送到服务器，还要将文件发送到提取并替换现有文件。

When sending a file (.zip) from the client to server, should I send it over TCP or use something like FTP? I would not only like to send the file to the server, but also when it arrived to extract and replace the existing files.

亲切的问候，Alex

Kind regards, Alex

编辑：这是我用来将文件从客户端传输到服务器，但是文件没有以完整大小到达目的地.D：

This is what I used for transferring a file from the client to server, however the file doesn't reach the destination in full size.. D:

服务器

package server.control.net.impl;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Update implements Runnable {

    private final static int serverPort = 5555;
    private final static String fileInput = "C:\\Users\\Alexander\\Documents\\update.zip";

    public static void main(String args[]) throws IOException{
        ServerSocket servsock = new ServerSocket(serverPort);
        File myFile = new File(fileInput);
        while (true) {
          Socket sock = servsock.accept();
          byte[] mybytearray = new byte[(int) myFile.length()];
          BufferedInputStream bis = new BufferedInputStream(new FileInputStream(myFile));
          bis.read(mybytearray, 0, mybytearray.length);
          OutputStream os = sock.getOutputStream();
          os.write(mybytearray, 0, mybytearray.length);
          os.flush();
          sock.close();
        }
    }

    public static void start(){
        Update upd = new Update();  
        Thread tupd = new Thread(upd);  
        tupd.start(); 
    }

    @Override
    public void run() {

    }
}

客户

package server.control.net;

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class TCPClient {

    private final static String serverIP = "127.0.0.1";
    private final static int serverPort = 5555;
    private final static String fileOutput = "C:\\Users\\Alexander\\Documents\\updateoutput.zip";

    public static void main(String args[]) throws UnknownHostException, IOException {
        Socket sock = new Socket(serverIP, serverPort);
        byte[] mybytearray = new byte[1024];
        InputStream is = sock.getInputStream();
        FileOutputStream fos = new FileOutputStream(fileOutput);
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        int bytesRead = is.read(mybytearray, 0, mybytearray.length);
        bos.write(mybytearray, 0, bytesRead);
        bos.close();
        sock.close();
    }
}

推荐答案

你在 serverSocket.accept（）之后，没有从套接字获取 InputStream 。在套接字上打开 InputStream 。

You did not get InputStream from the socket after serverSocket.accept(). Open InputStream on the socket.

    clientSocket = serverSocket.accept();

    InputStream in = clientSocket.getInputStream();

    // Writing the file to disk
    // Instantiating a new output stream object
    OutputStream output = new FileOutputStream("YourFile.zip");

    byte[] buffer = new byte[1024];
    while ((bytesRead = in.read(buffer)) != -1) {
        output.write(buffer, 0, bytesRead);
    }
    // Closing the FileOutputStream handle
    output.close();

请参阅以下工作示例：通过套接字写入和读取文件

Refer to working example at : Write and Read File over Socket

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