[Java] For a summary of some use java.util.logging

Copyright: hard code word, when you reprint remember to tell me https://blog.csdn.net/dxyinme/article/details/90216764

This is a built-in log java class

Using logs do not forget to import these two

import java.util.logging.*;
import static java.util.logging.Logger.getLogger;

1. Create a class corresponding to the current logger

static final Logger logger = getLogger(CommandInfoReader.class.getName());

2. If you want to save the file logger
because of problems reading and writing files, this handler could lead to open conflict duplicate files, but it does not matter ...
as long as that information at the end of all extra and can be in a file inside.

FileHandler filehandler = new FileHandler(fileName, true);
logger.addHandler(filehandler);//绑定文件
logger.removeHandler(filehandler);//解除绑定

3.logger several levels
(Anyway, I used these three, a warning / information / in good condition)

logger.warning(xxx);
logger.info(xxx);
logger.fine(xxx);