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java-log4j-xml配置 category、logger、boot 标签使用

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2023-12-01


java-log4j-xml配置 category、logger、boot 标签使用

一、节点说明:

root:基础日志配置、包括使用的输出器、日志级别等;
logger:自定义输出配置;
category:自定义输出配置;


logger、category 用法一致,可以配置通过 additivity 属性标记是否集成 root 配置;


二、maven 依赖:
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>






log4j 配置:demo/src/main/resources/core/log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>


    <!-- 控制台输出 -->
    <appender name="stdout" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %p [%c] - %m%n"/>
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <!--最小级别-->
            <param name="LevelMin" value="INFO"/>
        </filter>
    </appender>


    <!-- 系统启动日志输出文件 -->
    <appender name="fileAppender" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="Encoding" value="UTF-8"/>
        <param name="File" value="/logs/test_log4j_logs/system.log"/>
        <param name="DatePattern" value="'.'yyyy-MM-dd"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %p [%c] - %m%n"/>
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <!--最小级别-->
            <param name="LevelMin" value="INFO"/>
        </filter>
    </appender>


    <!-- 测试 category 配置节 -->
    <appender name="testCategoryAppender" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="/logs/test_log4j_logs/test_category_logs.log"/>
        <param name="DatePattern"  value="'.'yyyy-MM-dd-HH'.log'" />
        <layout  class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %p [%c] - %m%n"/>
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <!--最小级别-->
            <param name="LevelMin" value="INFO" />
        </filter>
    </appender>


    <!-- 测试 logger 配置节 -->
    <appender name="testAppender" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="/logs/test_log4j_logs/test_logger_logs.log"/>
        <param name="DatePattern"  value="'.'yyyy-MM-dd-HH'.log'" />
        <layout  class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %p [%c] - %m%n"/>
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <!--最小级别,小于 error 级别错误将不输出-->
            <param name="LevelMin" value="ERROR" />
        </filter>
    </appender>


    <!--自定义日志输出配置,additivity=是否继承 root 配置-->
    <category name="testCategoryLogger" additivity="false">
        <level value="INFO"></level>
        <appender-ref ref="testCategoryAppender"></appender-ref>
        <appender-ref ref="stdout"></appender-ref>
    </category>
    <!--自定义日志输出配置,additivity=是否继承 root 配置-->
    <logger name="testLogger" additivity="false">
        <!--级别-->
        <level value="INFO"></level>
        <!--输出器-->
        <appender-ref ref="testAppender"></appender-ref>
        <appender-ref ref="stdout"></appender-ref>
    </logger>


    <!--基础日志输出配置-->
    <root>
        <level value="INFO"/>
        <!--输出器-->
        <appender-ref ref="stdout"/>
        <appender-ref ref="fileAppender"/>
    </root>


</log4j:configuration>





三、测试代码:demo/src/test/java/com/example/demo/TestLog4j.java
package com.example.demo;


import org.apache.log4j.Logger;
import org.junit.Before;
import org.junit.Test;
import org.springframework.util.Log4jConfigurer;


import java.io.FileNotFoundException;


/**
 * @author xiaojing.xie
 * @create 2017-09-18
 **/
public class TestLog4j {
    @Before
    public void before(){
        try {
            Log4jConfigurer.initLogging("classpath:core/log4j.xml");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
    @Test
    public void test3(){
        Logger log = Logger.getLogger("testLogger");
        log.info("info");
        log.debug("debug");
        log.error("error");
        log.warn("warn");
        log.trace("trace");
    }
    @Test
    public void test2(){
        Logger log = Logger.getLogger("testCategoryLogger");
        log.info("info");
        log.debug("debug");
        log.error("error");
        log.warn("warn");
        log.trace("trace");
    }
    @Test
    public void test1(){
        Logger log = Logger.getLogger("testAppender");
        log.info("info");
        log.debug("debug");
        log.error("error");
        log.warn("warn");
        log.trace("trace");
    }
}



四、测试说明:

主要观察 /logs/test_log4j_logs/ 路径下system.log、test_category_logs.log、test_logger_logs.log 三个文件的内容写入。





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