Log4J简单应用代码

深碍√TFBOYSˉ_ 2021-11-27 00:32 265阅读 0赞

### 1、所需jar包 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIyMDQ5Nzcz_size_16_color_FFFFFF_t_70][]

### 2、log4j.properties ###

#log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    #log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    #log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
    #log4j.logger.com.ibatis=debug
    #log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug
    #log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug
    #log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug
    #log4j.logger.java.sql.Connection=debug
    #log4j.logger.java.sql.Statement=debug
    #log4j.logger.java.sql.PreparedStatement=debug,stdout 
    
    root = level name1  name2
    log4j.rootLogger = ERROR,R,CONSOLE,stdout
    
    log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
    log4j.appender.R.File=${catalina.base}/logs/onlyCode.log
    log4j.appender.R.append=true
    log4j.appender.R.datePattern='.'yyyy-MM-dd'.txt'
    log4j.appender.R.Threshold = INFO
    log4j.appender.R.layout=org.apache.log4j.PatternLayout
    log4j.appender.R.layout.ConversionPattern=[%-4p][%d{yyyy-MM-dd HH\:mm\:ss}][%l]%m%n
    
    
    log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
    log4j.appender.CONSOLE.Threshold=ERROR
    log4j.appender.CONSOLE.Target=System.out
    log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
    log4j.appender.CONSOLE.layout.ConversionPattern= [%-4p][%d{yyyy-MM-dd HH\:mm\:ss}][%l]%m%n
    
    
    
    log4j.logger.com.opensymphony=INFO
    log4j.logger.org.apache.struts2=ERROR
    log4j.logger.com.ibatis=ERROR
    log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=ERROR
    log4j.logger.com.ibatis.common.jdbc.ScriptRunner=ERROR
    log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=ERROR
    #log4j.logger.java.sql.Connection=ERROR
    #log4j.logger.java.sql.Statement=ERROR
    #log4j.logger.java.sql.PreparedStatement=ERROR,stdout 
    
    
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

### 3、web.xml中添加上下文加载项 ###

![20190723132319811.png][]

<context-param>
    	<param-name>log4jConfigLocation</param-name>
    	<param-value>classpath:log4j.properties</param-value>
    </context-param>

### 4、代码应用 ###

package com.memcache.pool;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class Testtt {
    
    	private static final Logger LOG = LoggerFactory.getLogger(Testtt.class);
    
    	public static void main(String[] args) {
    		
    		try {
    			int i=1/0;
    		} catch (Exception e) {
    			LOG.error("memcached get exception: " + "myerror", e);
    		}
    	}
    
    }

![20190723134155486.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIyMDQ5Nzcz_size_16_color_FFFFFF_t_70]: /images/20211126/6a5231d266174f328c52619b4901c898.png
[20190723132319811.png]: /images/20211126/7979c9c4de5e4ff1a2bdedffa901ee57.png
[20190723134155486.png]: /images/20211126/71de07a82c0d4a959ef6fe1401cfcf0b.png