Java 通过套接字进行文件传输-空文件

我在将文件从服务器传输到客户端时遇到问题。传输完成后，将创建文件，但其为空。请注意，当我将它从客户端发送到服务器时，它可以工作。有时，在long fileLength=dis.readLong和String fileName=dis.readUTF时也会出现EOF异常

客户：

private void sendFile(String path) throws IOException {
    BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
    DataOutputStream dos = new DataOutputStream(bos);

    File file = new File(path);

    long length = file.length();
    dos.writeLong(length);

    String name = file.getName();
    dos.writeUTF(name);

    FileInputStream fis = new FileInputStream(file);
    BufferedInputStream bis = new BufferedInputStream(fis);

    int theByte = 0;
    while((theByte = bis.read()) != -1) 
        bos.write(theByte);

    dos.close();
    bis.close();   

    displayMessage(MESSAGE_SENT);
}

private void getFile() throws IOException {     
    BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());
    DataInputStream dis = new DataInputStream(bis);

        long fileLength = dis.readLong();
    String fileName = dis.readUTF();

    File file = new File(System.getProperty("user.dir") + "/" + fileName);

    FileOutputStream fos = new FileOutputStream(file);
    BufferedOutputStream bos = new BufferedOutputStream(fos);

    int theByte = 0;
    while((theByte = bis.read()) != -1) 
        bos.write(theByte);

    bos.close();
    dis.close();
    displayMessage(MESSAGE_DOWNLOADED);
}

服务器：

private void sendFile(String path) throws IOException {     
    BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
    DataOutputStream dos = new DataOutputStream(bos);

    File file = new File(path);

    long length = file.length();
    dos.writeLong(length);

    String name = file.getName();
    dos.writeUTF(name);

    FileInputStream fis = new FileInputStream(file);
    BufferedInputStream bis = new BufferedInputStream(fis);

    int theByte = 0;
    while((theByte = bis.read()) != -1) 
        bos.write(theByte);

    dos.close();
    bis.close();

    displayMessage(MESSAGE_SENT);
}

private void getFile() throws IOException {     
    BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());
    DataInputStream dis = new DataInputStream(bis);

    long fileLength = dis.readLong();
    String fileName = dis.readUTF();

    File file = new File(System.getProperty("user.dir") + "/" + fileName);

    FileOutputStream fos = new FileOutputStream(file);
    BufferedOutputStream bos = new BufferedOutputStream(fos);

    for(int j = 0; j < fileLength; j++) 
        bos.write(bis.read());

    bos.close();
    dis.close();
    displayMessage(MESSAGE_DOWNLOADED);
}

---

我认为问题在于不刷新输出流。像这样：

 int theByte = 0;
 while((theByte = bis.read()) != -1) 
       bos.write(theByte);

    dos.flush();

    dos.close();
    bis.close();

---

不做。接近呼叫刷新？我的错。DataOutputStream是FilterOutputStream的一个子类，API也说关闭刷新。很抱歉。但是，您确实在客户端sendFile方法中显式地刷新它；p和我没有在那里调用dos.close-无论如何，我测试了它，但它不起作用：当你通过调试器进入你的客户机代码时，你能确认数据到达了并且写文件本身没有问题吗？