log4j的配置

1.导入log4j的jar包。log4j-1.2.16.jar。

2.新建log4j.properties，建议放在src/main/config/log4j.properties。

log4j.properties：

log4j.rootLogger=INFO,stdout,info,warn,error

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %-5p %c{1}:%L - %m%n

log4j.appender.info=org.apache.log4j.RollingFileAppender
log4j.appender.info.Threshold=INFO
log4j.appender.info.File=/home/info.log
log4j.appender.info.MaxFileSize=200MB
log4j.appender.info.MaxBackupIndex=5
log4j.appender.info.layout=org.apache.log4j.PatternLayout
log4j.appender.info.layout.ConversionPattern=%d %-5p %l - %m%n
log4j.appender.info.filter.infoFilter = org.apache.log4j.varia.LevelRangeFilter
log4j.appender.info.filter.infoFilter.LevelMin=INFO
log4j.appender.info.filter.infoFilter.LevelMax=INFO

log4j.appender.warn=org.apache.log4j.RollingFileAppender
log4j.appender.warn.Threshold=WARN
log4j.appender.warn.File=/home/warn.log
log4j.appender.warn.MaxFileSize=200MB
log4j.appender.warn.MaxBackupIndex=5
log4j.appender.warn.layout=org.apache.log4j.PatternLayout
log4j.appender.warn.layout.ConversionPattern=%d %-5p %l - %m%n
log4j.appender.warn.filter.infoFilter = org.apache.log4j.varia.LevelRangeFilter
log4j.appender.warn.filter.infoFilter.LevelMin=WARN
log4j.appender.warn.filter.infoFilter.LevelMax=WARN

log4j.appender.error=org.apache.log4j.RollingFileAppender
log4j.appender.error.Threshold=ERROR
log4j.appender.error.File=/home/error.log
log4j.appender.error.MaxFileSize=200MB
log4j.appender.error.MaxBackupIndex=5
log4j.appender.error.layout=org.apache.log4j.PatternLayout
log4j.appender.error.layout.ConversionPattern=%d %-5p %l - %m%n
log4j.appender.error.filter.infoFilter = org.apache.log4j.varia.LevelRangeFilter
log4j.appender.error.filter.infoFilter.LevelMin=ERROR
log4j.appender.error.filter.infoFilter.LevelMax=ERROR

3.在web.xml中引入： 

<!-- 配置log4j -->
<!-- 配置log4j配置文件的路径，可以是xml或 properties（此参数必须配） -->
<!-- 下面使用了classpath 参数指定log4j.properties文件的位置，这样log4j的配置文件就不用非要放到src的下面 -->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:main/config/log4j.properties</param-value>
</context-param>
<!-- 使用spring的监听器,当应用启动时来读取log4j的配置文件 -->
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

4.在controller中配置：

package main.com.lvjin.controller;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

@Controller
public class UserController2 {
private static final Log log = 	LogFactory.getLog(UserController2.class);
@RequestMapping(value ="test.do")
@ResponseBody
public String test(HttpServletRequest request, HttpServletResponse response) throws IOException {
log.info("测试log4j~~~~~");
return "SUCCESS";
}
}

 

 5.如果想要log4j打印sql语句，则需要在log4j.properties中新增下列配置。

 下列配置中，“com.XXXXXXX.myMapping”为自己项目中MyBatis的xml文件所在的包名字。
 例如：    log4j.logger.com.lvjin.mapping=DEBUG

###############Log4j 4 SQL Output start#################
log4j.logger.com.XXXXXXX.myMapping=DEBUG
log4j.logger.com.springframework=DEBUG
log4j
4000
.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
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl=DEBUG
log4j.logger.java.sql=DEBUG,CONSOLE
###############Log4j 4 SQL Output end###################