无法让我的 Java 服务器接受来自我的客户端的文件传输 [英] Can't get my java server to accept a file transfer from my client

问题描述

我有两个文件:一个聊天服务器和一个聊天客户端.聊天客户端应该说它想将文件上传到服务器.然后它上传.但是，现在，所有消息都被正确发送/接收，但是当我尝试进行文件传输时，我唯一得到的是一个 0 字节的文件(位于我在服务器类中指定的路径中).

I have two files: a chat server and a chat client. The chat client is supposed to say that it wants to upload a file to the server. And then it uploads. However, right now, all of the messages are being sent / received properly, but when I try to get the file transfer, the only thing I get is a file with 0 bytes (which is at the path I specify inside of the server class.

chatclient 类的损坏部分:

Broken part of the chatclient class:

/**
 * Sends a broadcast to the server
 */
public static void broadcast() throws IOException {

    if (UserInput.getText() == "/upload") {

        File myFile = new File (FILE_TO_SEND);
        byte [] mybytearray  = new byte [(int)myFile.length()];
        fis = new FileInputStream(myFile);
        bis = new BufferedInputStream(fis);
        bis.read(mybytearray,0,mybytearray.length);
        os = Socket.getOutputStream();
        System.out.println("Sending " + FILE_TO_SEND + "(" + mybytearray.length + " bytes)");
        os.write(mybytearray,0,mybytearray.length);
        os.flush();
        System.out.println("Done.");
    }

    System.out.println("" + UserInput.getText());

    outputStream.println(UserInput.getText());
    outputStream.flush();
}

服务器类的损坏部分:

if (input.contains("/upload")) {
    byte [] mybytearray  = new byte [FILE_SIZE];
    InputStream is = csocket.getInputStream();
    fos = new FileOutputStream(FILE_TO_RECEIVED);
    bos = new BufferedOutputStream(fos);
    bytesRead = is.read(mybytearray,0,mybytearray.length);
    current = bytesRead;

    do {
        bytesRead =  is.read(mybytearray, current, (mybytearray.length-current));
        if (bytesRead >= 0) current += bytesRead;
    } 
    while(bytesRead > -1);

    bos.write(mybytearray, 0 , current);
    bos.flush();
    System.out.println("File " + FILE_TO_RECEIVED + " downloaded (" + current + " bytes read)");
}

推荐答案

你的复制循环是无稽之谈.在 Java 中复制流的规范方法如下:

Your copy loop is nonsense. The canonical way to copy a stream in Java is as follows:

while ((count = in.read(buffer)) > 0)
{
    out.write(buffer, 0, count);
}

其中 'count' 是一个整数，'buffer' 是一个长度 > 0 的 byte[] 数组.我通常使用 8192.

where 'count' is an int, and 'buffer' is a byte[] array of length > 0. I usually use 8192.

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