我一直在尝试从服务器向客户端发送文件时遇到了一些麻烦。我似乎无法将相同的文件从服务器发送到客户端到两个SEPERATE文件。相反，它只是附加到第一个文件的末尾！任何帮助，将不胜感激。Java - 无法写入第二个文件

编辑：我修改了代码。我已经将文件发送和接收任务模块化为2个函数'sendfile'和'recievefile'。我现在得到的错误是，在第二次调用之后，套接字在sendfile和recievefile函数处关闭。但是我所关闭的只是文件和输出流和输入流！也许关闭这些流将关闭套接字...？无论如何，我已经试过不关闭输入和输出流，会发生什么 - 1)什么都不会传输到目标文件。所以我只是在服务器端得到一个空白创建的文件。 2)第二个文件甚至没有创建。大。

像往常一样，任何帮助将被赞赏。

服务器：

package com.http.server;

import java.io.*;

import java.net.*;

public class Server

{

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

{

System.out.println("Server running...");

/* Listen on port 5555 */

ServerSocket server = new ServerSocket(5555);

/* Accept the sk */

Socket sk = server.accept();

System.out.println("Server accepted client");

BufferedReader inReader = new BufferedReader(new InputStreamReader(sk.getInputStream()));

BufferedWriter outReader = new BufferedWriter(new OutputStreamWriter(sk.getOutputStream()));

/* Read the filename */

String serverlocation = "C:/Users/Arjun/Desktop/CNW model/HTTP Website/";

String filename = serverlocation + inReader.readLine();

if (!filename.equals("")){

/* Reply back to client with READY status */

outReader.write("READY\n");

outReader.flush();

}

sendfile(sk, filename);

sendfile(sk, filename);

outReader.close();

inReader.close();

sk.close();

server.close();

}

public static void sendfile(Socket sk, String filename)

{

try{

OutputStream output = sk.getOutputStream();

FileInputStream file = new FileInputStream(filename);

byte[] buffer = new byte[sk.getSendBufferSize()];

int bytesRead = 0;

while((bytesRead = file.read(buffer))>0)

{

output.write(buffer,0,bytesRead);

}

file.close();

output.close();

}

catch (Exception ex){

System.out.println(ex);

}

}

}

客户：

package com.http.client;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.net.*;

import java.io.*;

public class Client extends JFrame implements ActionListener {

/**

*

*/

private static final long serialVersionUID = 1L;

private JTextField txtFile;

public static void main(String args[]){

/* Create and display the client form */

Client clientForm = new Client();

clientForm.Display();

}

public void Display(){

JFrame frame = new JFrame();

frame.setTitle("Client");

FlowLayout layout = new FlowLayout();

layout.setAlignment(FlowLayout.LEFT);

JLabel lblFile = new JLabel("URL:");

txtFile = new JTextField();

txtFile.setPreferredSize(new Dimension(150,30));

JButton btnTransfer = new JButton("Get");

btnTransfer.addActionListener(this);

JPanel mainPanel = new JPanel();

mainPanel.setLayout(layout);

mainPanel.add(lblFile);

mainPanel.add(txtFile);

mainPanel.add(btnTransfer);

frame.getContentPane().add(mainPanel);

frame.pack();

frame.setVisible(true);

}

public void actionPerformed(ActionEvent e) {

/* File Open Dialog box allows the user to select a file */

String filename=txtFile.getText();

try{

/* Try to connect to the server on localhost, port 5555 */

Socket sk = new Socket("localhost", 5555);

/* Send filename to server */

OutputStreamWriter outreader = new OutputStreamWriter(sk.getOutputStream());

outreader.write(filename + "\n");

outreader.flush();

/* Get response from server */

BufferedReader inReader = new BufferedReader(new InputStreamReader(sk.getInputStream()));

String serverStatus = inReader.readLine(); // Read the first line

/* If server is ready, receive the file */

while (!serverStatus.equals("READY")){}

/* Create a new file in the tmp directory using the filename */

recievefile(sk,filename);

recievefile(sk,"xx"+filename);

JOptionPane.showMessageDialog(this, "Transfer complete");

inReader.close();

outreader.close();

sk.close();

}

catch (Exception ex){

/* Catch any errors */

JOptionPane.showMessageDialog(this, ex.getMessage());

System.out.println(ex);

}

}

public void recievefile(Socket sk, String filename)

{

try{

InputStream input = sk.getInputStream();

FileOutputStream wr = new FileOutputStream(new File("C:/tmp/" + new File(filename).getName()));

byte[] buffer = new byte[sk.getReceiveBufferSize()];

int bytesReceived = 0;

while((bytesReceived = input.read(buffer))>0)

{

/* Write to the file */

wr.write(buffer,0,bytesReceived);

}

wr.close();

input.close();

}

catch (Exception ex){

/* Catch any errors */

JOptionPane.showMessageDialog(this, ex.getMessage());

System.out.println(ex);

}

}

}

+1

您正在打开一个新文件，但不是新流。 我想你是沿着相同的流发送这两个文件，所以客户端永远不会到达文件的末尾。 –

+0

你确定文件名实际上不是“blah.htm”？ –

+0

文件名确实不是“blah.htm”。此代码的目的是从服务器传输请求的文件。但我转移了两次。一旦到了适当的文件和一次到一个虚拟文件a.k.a blah.htm –