Java：如何将控制台输出保存到文本文件？
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Java: How to save console output to a text file?
提问by JDL Wahaha
For example, in the code, I have: System.out.println("Hello World");
例如，在代码中，我有： System.out.println("Hello World");
The console will print: Hello World
控制台将打印： Hello World
So, I want to save the console output into a text file. Can anyone please hint me through this?
所以，我想将控制台输出保存到一个文本文件中。任何人都可以通过这个提示我吗？
采纳答案by Subhrajyoti Majumder
System class provide you a way to dump output in different stream which is System#setOut(PrintStream out)
System 类为您提供了一种在不同流中转储输出的方法 System#setOut(PrintStream out)
Using this method you can pass you FileInputstream to System.setOutand you can save the console output.
使用此方法，您可以将 FileInputstream 传递给System.setOut并保存控制台输出。
PrintStream printStream = new PrintStream(new FileOutputStream(file));
System.setOut(printStream);
One interesting part of this question is though outis declared as final in System class but still you reassign this by System#setOut.
这个问题的一个有趣的部分是虽然out在 System 类中被声明为 final ，但你仍然通过System#setOut.
回答by Abimaran Kugathasan
Create a file, and set as the out of the System class.
创建一个文件，并设置为系统类的out。
File file = new File("out.txt"); //Your file
FileOutputStream fos = new FileOutputStream(file);
PrintStream ps = new PrintStream(fos);
System.setOut(ps);
System.out.println("This goes to out.txt");
