为什么我的日志未写入文件？

Question

I'm trying write my logs in file, but file is empty and logs print in console. File is placed in resource folder project. Why is problem?

import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;

private Logger logger = Logger.getLogger(MyClass.class.getName());
private FileHandler fileHandler;

public String book(){
        try {
            fileHandler = new FileHandler("super.txt", 100000, 1, true);
            SimpleFormatter formatter = new SimpleFormatter();
            fileHandler.setFormatter(formatter);
            logger.addHandler(fileHandler);
            logger.setLevel(Level.INFO);
            logger.log(Level.INFO, "INFO");
        } catch (IOException e) {
            e.printStackTrace();
        }
        logger.log(Level.WARNING, "WARN");
        return "log is save or not )";
    }

Answer 1

Have you tried with "resource/super.txt" instead of "super.txt" ? Also, don't forget to close your fileHandler when you have finished with it.

Answer 2

I tried your code and it works. It creates a log file in the "current directory" that is the project root directory. You can pass a calculated absolute path as file name to get it logging where you want.

Logging to console can be disabled by adding this :

logger.setUseParentHandlers(false);