问题
Possible Duplicate:
Print java output to a file
In a Java program, I have a long method, (which I don't think is important to post since it's not vital to the question) that has a large number of println statements to print status updates to the console.
Instead of having these printout to the console, I'd like them to go into a txt file where I can store them and review them later.
Is there a simple way to redirect the output without manually going through each println statement?
If not, what's the best way to go about this?
回答1:
The System class has a static method, System.setOut(PrintStream out). All you have to do is create your own PrintStream that writes to a file, stuff it into this method and you're all set.
Better less fragile solution: Don't use System.out.printFoo(...) but instead just use a logger, and change the logging levels as it suits your purposes at that time.
回答2:
I have had to do this before, it isn't very neat and I hope you aren't doing it for a final piece of code, but I did:
PrintStream ps = new PrintStream("\file.txt");
PrintStream orig = System.out;
System.setOut(ps);
//TODO: stuff with System.out.println("some output");
System.setOut(orig);
ps.close();
回答3:
- add extra parameter to the method
, PrintStream out - search&replace
System.outwithoutin your method. - done.
- (call method with a PrintStream wrapped around a FileOutputStream)
来源：https://stackoverflow.com/questions/14552342/redirect-lots-of-system-out-printlns-to-a-txt-file