java - 简单的Java文件传输程序问题

Question

我正在尝试从服务器到客户端进行简单的文件传输。

它需要像这样:

Client asks for file.

Server sends the file to client.

现在在代码中(下面)(这是我找到的唯一代码，很难找到) 它只向我发送一个文本文件“好”(甚至只在客户端中显示一行)。 如果我尝试发送任何其他文件类型(如图像或 rar 文件)，它就会损坏。

所以，有人可以帮我找到一些可以发送和接收所有类型文件的工作代码(Java 语言)，或者向我解释这段代码的问题是什么。

服务器端:

public class FileServer {   
    public static void main(String args[])throws IOException
    { 
        ServerSocket ss=null;
        try
        {  
            ss=new ServerSocket(8081);
        }
        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();
        System.out.println("The requested file is : "+s);
        File f=new File(s);
        if(f.exists())
        { 
            BufferedReader d=new BufferedReader(new FileReader(s));
            String line;
            while((line=d.readLine())!=null)
            {
                put.write(line);
                put.flush();
            }
            d.close();
            System.out.println("File transfered");
            cs.close();
            ss.close();
        }  
    }  
}

客户端:

class MyClient {
    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",8081);
            get=new BufferedReader(new InputStreamReader(s.getInputStream()));
            put=new PrintWriter(s.getOutputStream(),true);
        }  
        catch(Exception e)
        {
            System.exit(0);
        }
        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("c:\\output");
        FileOutputStream  fs=new FileOutputStream(f1);
        while((u=get.readLine())!=null)
        { 
            byte jj[]=u.getBytes();
            fs.write(jj);
        }
        fs.close();
        System.out.println("File received");
        s.close();
    }
}

是的ssssssssssssssssssssssssssssssssssssssssssssssssss 终于……

这是变化

客户端。

class MyClient {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",8081);
        get=new BufferedReader(new InputStreamReader(s.getInputStream()));
        put=new PrintWriter(s.getOutputStream(),true);        
    }  
    catch(Exception e)
    {
        System.exit(0);
    }
    InputStreamReader get2=new InputStreamReader(s.getInputStream());
    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("c:\\output");
    FileOutputStream  fs=new FileOutputStream(f1);

    BufferedInputStream d=new BufferedInputStream(s.getInputStream());
    BufferedOutputStream outStream = new BufferedOutputStream(new             FileOutputStream(f1));
    byte buffer[] = new byte[1024];
    int read;
    while((read = d.read(buffer))!=-1)
    {
        outStream.write(buffer, 0, read);
        outStream.flush();
    }

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

服务器端。

public class FileServer {   
    public static void main(String args[])throws IOException
    { 
        ServerSocket ss=null;
        try
        {  
            ss=new ServerSocket(8081);
        }
        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();
        System.out.println("The requested file is : "+s);
        File f=new File(s);
        if(f.exists())
        { 
            BufferedInputStream d=new BufferedInputStream(new FileInputStream(s));
            BufferedOutputStream outStream = new BufferedOutputStream(cs.getOutputStream());
            byte buffer[] = new byte[1024];
            int read;
            while((read = d.read(buffer))!=-1)
            {
                outStream.write(buffer, 0, read);
                outStream.flush();
            }
            d.close();
            System.out.println("File transfered");
            cs.close();
            ss.close();
        }  
    }  
}

非常感谢大家...

Answer 1

在这种情况下，您不应该使用阅读器。当您读/写字符数据(文本)而不是二进制时，读者应该处理。使用某种 InputStream

http://download.oracle.com/javase/tutorial/i18n/text/stream.html

更新: 在 f.exist() 之后的服务器部分:

BufferedInputStream d=new BufferedInputStream(new FileInputStream(s));
BufferedOutputStream outStream = new BufferedOutputStream(cs.getOutputStream());
byte buffer[] = new byte[1024];
int read;
while((read = d.read(buffer))!=-1)
{
    outStream.write(buffer, 0, read);
    outStream.flush();
}
d.close();
System.out.println("File transfered");
cs.close();
ss.close();