Java IO将一个文件复制到另一个 [英] java IO to copy one File to another

问题描述

我有两个Java.io.File对象file1和file2。我想将文件1的内容复制到文件2。有没有一个标准的方法来做到这一点，而不必创建一个方法，读取file1和写入file2

解决方案

没有内置的方法来做到这一点。最接近你要完成的是来自 FileOutputStream 的 transferFrom 方法，如下所示：

  FileChannel src = new FileInputStream（file1）.getChannel（）; 
 FileChannel dest = new FileOutputStream（file2）.getChannel（）; 
 dest.transferFrom（src，0，src.size（））; 
  

不要忘记处理异常，并最终关闭 / code> block。

I have two Java.io.File objects file1 and file2. I want to copy the contents from file1 to file2. Is there an standard way to do this without me having to create a method that reads file1 and write to file2

解决方案

No, there is no built-in method to do that. The closest to what you want to accomplish is the transferFrom method from FileOutputStream, like so:

  FileChannel src = new FileInputStream(file1).getChannel();
  FileChannel dest = new FileOutputStream(file2).getChannel();
  dest.transferFrom(src, 0, src.size());

And don't forget to handle exceptions and close everything in a finally block.

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