无法在Java中通过套接字发送大文件 [英] Can't send large files over socket in Java

问题描述

我得到了服务器和客户端应用程序，它们在发送小文件时工作得很好，但是当我尝试发送例如700mb的电影文件时，它给了我

I got working server and client applications, they work perfect while sending small files, but when I try to send for example movie file that is 700mb over socket it gives me

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space

我搜索了互联网，发现了一些关于发送大文件的教程，但是对它们不太了解，但我认为我的问题是写文件。

I searched the internet and found some tutorials on sending large files, but couldn't quite understand them, but I think my porblem is in writing file.

这是服务器用来编写我的文件的代码：

This is the code that server uses to write my file:

output = new FileOutputStream(directory + "/" + fileName);
            long size = clientData.readLong();
            byte[] buffer = new byte[1024];

            while (size > 0 && (bytesRead = clientData.read(buffer, 0, (int) Math.min(buffer.length, size))) != -1) {
                output.write(buffer, 0, bytesRead);
                size -= bytesRead;
            }
            output.close();

以下是我的客户用来发送文件的代码：

And here is the code that my client uses to send a file:

byte[] fileLength = new byte[(int) file.length()];  

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

        DataInputStream dis = new DataInputStream(bis);     
        dis.readFully(fileLength, 0, fileLength.length);  

        OutputStream os = socket.getOutputStream();  

        //Sending size of file.
        DataOutputStream dos = new DataOutputStream(os);   
        dos.writeLong(fileLength.length);
        dos.write(fileLength, 0, fileLength.length);     
        dos.flush();  

        socket.close();  

推荐答案

它为您提供 OutOfMemoryError 因为您在发送之前尝试将整个文件读入内存。这是完全100％完全没必要的。只需读取和写入块，就像在接收代码中一样。

It gives you OutOfMemoryError because you are trying to read the entire file into memory before sending it. This is 100% completely and utterly unnecessary. Just read and write chunks, much as you are doing in the receiving code.

这篇关于无法在Java中通过套接字发送大文件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！