无法在Java中通过套接字发送大文件

本文介绍了无法在Java中通过套接字发送大文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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.