无法通过局域网将文件从服务器发送到客户端 [英] Can't send file from server to client over LAN

问题描述

这是服务器端和客户端的代码段，用户可以通过这些代码段向服务器请求文件.服务器将发送文件.

Here is a code snippet of both server side and client side through which a user can request a file from server. The server will send the file.

有两个问题:

• 服务器端发送空文件.
• 当尝试在局域网中运行代码时，会给出ioexception

我不明白为什么服务器发送空文件，请帮忙.

I don't understand why sever is sending empty file, please help.

服务器端代码:

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
 package ftpserverclient.FileClientServer;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 *
 * @author Arnab
 */
public class FileServer {

public static void main(String args[])throws IOException
         { 
             ServerSocket ss=null;
             try
             {  
                 ss=new ServerSocket(8085);
             }
             catch(IOException e)
             { 
                 System.out.println("couldn't listen");
                 System.exit(0);
             }
             Socket cs=null;
             try
             { 
                 cs=ss.accept();
                 System.out.println("Connection established"+cs);
             }
             catch(Exception e)
             { 
                 System.out.println("Accept failed");
                 System.exit(1);
             } 
             PrintWriter put=new PrintWriter(cs.getOutputStream(),true);
             BufferedReader st=new BufferedReader(new InputStreamReader(cs.getInputStream()));
             String s=st.readLine();


             String path = s ; 
             System.out.println("The requested file is path: "+path);
             System.out.println("The requested file is : "+s);
             File f=new File(path);
             if(f.isFile())
             { 
                 BufferedReader d=new BufferedReader(new FileReader(f));
                 String line;
                 while((line=d.readLine())!=null)
                 {
                     put.write(line);
                     put.flush();
                 }
                 d.close();
                 System.out.println("File transfered");
                 cs.close();
                 ss.close();
             } 
         }

}

客户侧代码:

package ftpserverclient.FileClientServer;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

/**
 *
 * @author Arnab
 */
public class FileClient {

public static void main(String srgs[])throws IOException
{
    Socket s=null;
    BufferedReader get=null;
    PrintWriter put=null;
    try
    { 
        s=new Socket("127.0.0.1",8085);
        get=new BufferedReader(new InputStreamReader(s.getInputStream()));
        put=new PrintWriter(s.getOutputStream(),true);

        String u,f;
        System.out.println("Enter the file name to transfer from server:");
        DataInputStream dis=new DataInputStream(System.in);
        f=dis.readLine();
        put.println(f);

        File f1=new File(f);



        FileOutputStream  fs=new FileOutputStream(new File("C:\\PictureDestination\\a.jpg"));


        while((u=get.readLine())!=null)
        { 
            System.out.println(u);
            byte jj[]=u.getBytes();
            fs.write(jj);
        } 
        fs.close();
        System.out.println("File received");
        s.close();
    }catch(Exception e)
    {
        e.printStackTrace();
        System.exit(0);
    }
}       

}

推荐答案

最后，我发现这东西可以正常工作.

Finally i found this this thing working .

这是更改.

将String u,f;更改为String f; int u;和while((u=get.readLine())!=null) { System.out.println(u); byte jj[]=u.getBytes(); fs.write(jj); } 进入 while((u=get.read(jj,0,1024))!=-1) { fs.write(jj,0,u); } fs.close();

changing String u,f; to String f; int u; and while((u=get.readLine())!=null) { System.out.println(u); byte jj[]=u.getBytes(); fs.write(jj); } into while((u=get.read(jj,0,1024))!=-1) { fs.write(jj,0,u); } fs.close();

，但是1个问题仍然存在.它不能在局域网上工作.

but 1 problem still exists. It is not working ON LAN.

这篇关于无法通过局域网将文件从服务器发送到客户端的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！