JAVA日志框架之JUL、JDK原生日志框架详解

package com.eryi;

import com.sun.scenario.effect.impl.sw.sse.SSEBlend_SRC_OUTPeer;

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

public class Test {
    @org.junit.Test
    public void test1() {
    	//级别由低到高，默认输出info以上级别
        Logger logger = Logger.getLogger("abc");
        logger.log(Level.FINEST,"FINEST level");
        logger.log(Level.FINER,"FINER level");
        logger.log(Level.FINE,"FINE level");
        logger.log(Level.CONFIG,"CONFIG level");
        logger.log(Level.INFO,"INFO level");
        logger.log(Level.WARNING,"WARNING level");
        logger.log(Level.SEVERE,"SEVERE level");
        logger.log(Level.FINEST,"FINEST level");
        System.out.println("hello");
    }
}

public static void main(String[] args) {
        // 获取根记录器
        Logger rootLogger = Logger.getLogger("");

        // 移除默认处理器
        rootLogger.setUseParentHandlers(false);

        // 创建控制台处理器
        ConsoleHandler consoleHandler = new ConsoleHandler();
        
        // 设置级别
        consoleHandler.setLevel(Level.INFO);

        // 设置自定义格式器
        consoleHandler.setFormatter(new SimpleFormatter());

        // 设置自定义过滤器
        consoleHandler.setFilter(new CustomFilter());

        // 将处理器添加到根记录器
        rootLogger.addHandler(consoleHandler);

        // 输出日志
        Logger logger = Logger.getLogger(JULConfigExample.class.getName());
        logger.severe("Severe message");
        logger.warning("Warning message");
        logger.info("Info message");
        logger.config("Config message");
        logger.fine("Fine message");
        logger.finer("Finer message");
        logger.finest("Finest message");
    }

    // 自定义格式器
    static class SimpleFormatter extends Formatter {
        @Override
        public String format(LogRecord record) {
            return "[" + record.getLevel() + "] - " + record.getMessage() + "\n";
        }
    }

    // 自定义过滤器
    static class CustomFilter implements Filter {
        @Override
        public boolean isLoggable(LogRecord record) {
            // 在这里可以添加自定义的过滤逻辑
            return record.getLevel().intValue() >= Level.INFO.intValue();
        }
    }

#默认配置
handlers= java.util.logging.ConsoleHandler
.level= FINEST

#file hander配置
java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter

#console handler配置
java.util.logging.ConsoleHandler.level = FINEST
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

# 具体包路径下的日志级别
com.eryi.level = FINEST

Logger a = Logger.getLogger("a");
Logger b = Logger.getLogger("b");
System.out.println(a.getParent());
System.out.println(b.getParent());

Logger a = Logger.getLogger("a");
Logger b = Logger.getLogger("a.b");
System.out.println(a.getParent());
System.out.println(b.getParent()==a);