通过套接字进行文件传输 - 空文件

Question

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，文件被创建，但它是空的。请注意，当我从客户端发送到服务器时，它可以正常工作。有时候我也会在长fileLength = dis.readLong（）和String fileName = dis.readUTF（）的时候得到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); 
} 

Answer 1

我认为问题出在不冲水的输出流。像这样：

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

    dos.flush(); 

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