实例介绍,如何在开发中将各层日志归类输出.

最近开发的模块中,日志文件的输出很郁闷,基于xml配置的,先不说好坏,至少个人很不适应那种配置方式,所以今天谈一下日志分层控制输出.

在开发中,大多都基于一定的框架模式,框架模式降低了模块间的耦合性、提高了代码的重用性、部署快、成本低，而且代码的维护性高. 例如Java中常用的mvc框架模式.

实例中结合mvc框架模式, 谈谈如何将程序中各个层的日志归类输出.

步骤一: 创建spring项目,在web.xml文件中添加日志文件的配置监听

    <!-- 日志文件 -->
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/context/log4j.properties</param-value>
    </context-param>
    
    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>3000</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

第二步: 日志的属性文件配置

#log4j.rootLogger=INFO,console,file
log4j.rootLogger=INFO,console,file
#用logger时给它一个自定义的名字(如这里的"ctrlLog"),程序中public final static Logger job=Logger.getLogger("ctrlLog");
#然后在log4j.properties中做出相应配置即可,example:log4j.appender.ctrl=org.apache.log4j.DailyRollingFileAppender 
log4j.logger.ctrlLog=INFO,ctrl
log4j.logger.serviceLog=INFO,service
log4j.logger.daoLog=INFO,dao
log4j.logger.indexLog=INFO,index
log4j.logger.jobLog=INFO,job
log4j.logger.searchLog=INFO,search

#定义console输出到控制台
log4j.appender.console=org.apache.log4j.ConsoleAppender
#定义console控制台的布局模式为PaternLayout
log4j.appender.console.layout=org.apache.log4j.PatternLayout
#定义console控制台的输出格式
log4j.appender.console.layout.ConversionPattern=%p %d{HH:mm:ss.SSS} [%X{ip}] - %l %m%n


#定义file输出到文件
log4j.appender.file=org.apache.log4j.RollingFileAppender
#定义file输出到哪个文件
log4j.appender.file.File=/var/log/vms/vms.log
#定义file输出文件的最大长度
log4j.appender.file.MaxFileSize = 1024KB
#定义file的备份文件数
log4j.appender.file.MaxBackupIndex = 3
#定义file的布局模式为PatternLayout
log4j.appender.file.layout=org.apache.log4j.PatternLayout
#定义file的输出模式
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd hh:mm:ss}:%p %t %c - %m%n

#mybatis操作日志配置  
log4j.logger.com.ibatis=ERROR
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=ERROR
log4j.logger.com.ibatis.sqlmap.engine.cache.CacheModel=ERROR
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientImpl=ERROR
log4j.logger.com.ibatis.sqlmap.engine.builder.xml.SqlMapParser=ERROR
log4j.logger.com.ibatis.common.util.StopWatch=ERROR
log4j.logger.java.sql.Connection=ERROR
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG

#将控制层的日志打印到controller.log文件中
log4j.appender.ctrl=org.apache.log4j.DailyRollingFileAppender 
log4j.appender.ctrl.File=/var/log/vms/controller.log 
log4j.appender.ctrl.layout=org.apache.log4j.PatternLayout
log4j.appender.ctrl.DatePattern='_'yyyy-MM-dd
log4j.appender.ctrl.layout.ConversionPattern=[%d{yyyy-MM-dd HH:mm:ss}]:%X{ip} [%-5p] %m%n


#将业务层的日志打印到service.log文件中
log4j.appender.service=org.apache.log4j.DailyRollingFileAppender 
log4j.appender.service.File=/var/log/vms/service.log 
log4j.appender.service.layout=org.apache.log4j.PatternLayout
log4j.appender.service.DatePattern='_'yyyy-MM-dd
log4j.appender.service.layout.ConversionPattern=[%d{yyyy-MM-dd HH:mm:ss}]:%X{ip} [%-5p] %m%n


#将持久层的日志打印到dao.log文件中
log4j.appender.dao=org.apache.log4j.DailyRollingFileAppender 
log4j.appender.dao.File=/var/log/vms/dao.log 
log4j.appender.dao.layout=org.apache.log4j.PatternLayout
log4j.appender.dao.DatePattern='_'yyyy-MM-dd
log4j.appender.dao.layout.ConversionPattern=[%d{yyyy-MM-dd HH:mm:ss}]:%X{ip} [%-5p] %m%n

#将定时作业的日志打印到job.log文件中
log4j.appender.job=org.apache.log4j.DailyRollingFileAppender
log4j.appender.job.File=/var/log/vms/job.log 
log4j.appender.job.layout=org.apache.log4j.PatternLayout
log4j.appender.job.DatePattern='_'yyyy-MM-dd
log4j.appender.job.layout.ConversionPattern=[%d{yyyy-MM-dd HH\:mm\:ss}] [%-5p] %m%n


#将索引的日志打印到index.log文件中
log4j.appender.index=org.apache.log4j.DailyRollingFileAppender 
log4j.appender.index.File=/var/log/vms/index.log 
log4j.appender.index.layout=org.apache.log4j.PatternLayout
log4j.appender.index.DatePattern='_'yyyy-MM-dd
log4j.appender.index.layout.ConversionPattern=[%d{yyyy-MM-dd HH:mm:ss}]:%X{ip} [%-5p] %m%n

#将搜索操作日志打印到search.log文件中
log4j.appender.search=org.apache.log4j.DailyRollingFileAppender 
log4j.appender.search.File=/var/log/vms/search.log 
log4j.appender.search.layout=org.apache.log4j.PatternLayout
log4j.appender.search.DatePattern='_'yyyy-MM-dd
log4j.appender.search.layout.ConversionPattern=[%d{yyyy-MM-dd HH\:mm\:ss}]\:%X{ip} [%-5p] %m%n

日志文件根据需要配置其输出级别,实例中配置的为INFO级别,正式环境下可配置为ERROR级别,因为大量的INFO日志记录会耗费不必要的磁盘空间.

关于日志文件的配置,可以参看这篇: http://www.cnblogs.com/dennisit/archive/2013/01/01/2841603.html

第三步: 程序中分离各层输出控制

package com.bae.vms.util;

import java.io.PrintWriter;
import java.io.StringWriter;

import org.apache.log4j.Logger;


/**
 * description:
 *
 * @author <a href='mailto:dennisit@163.com'> Cn.pudp (En.dennisit)</a> Copy Right since 2013-12-20 
 *
 * com.bae.vms.util.LogUtil.java
 *
 */

public class LogUtil {


    /**
     * 一般日志log
     */
    public final static Logger log=Logger.getLogger(LogUtil.class);
    
    public static void logDebug(String s){
        log.debug(s);
    } 
    public static void logInfo(String s){
        log.info(s);
    } 
    public static void logError(String s){
        log.error(s);
    }
    public static void logError(String s,Exception e){
        log.error(s,e);
    }
    
    
    /**
     * 索引日志
     */
    public final static Logger indexLog=Logger.getLogger("indexLog");
    
    public static void indexLogDebug(String s){
        indexLog.debug(s);
    } 
    public static void indexLogInfo(String s){
        indexLog.info(s);
    } 
    public static void indexLogError(String s){
        indexLog.error(s);
    }
    public static void indexLogError(String s,Exception e){
        indexLog.error(s,e);
    }
    /**
     * controller日志
     */
    public final static Logger ctrl=Logger.getLogger("ctrlLog");
    
    public static void ctrlLogDebug(String s){
        ctrl.debug(s);
    } 
    public static void ctrlLogInfo(String s){
        ctrl.info(s);
    } 
    public static void ctrlLogError(String s){
        ctrl.error(s);
    } 
    public static void ctrlLogError(String s,Exception e){
        ctrl.error(s,e);
    } 
    
    /**
     * 业务逻辑层日志
     */
    public final static Logger service=Logger.getLogger("serviceLog");

    public static void serviceLogDebug(String s){
        service.debug(s);
    } 
    public static void serviceLogInfo(String s){
        service.info(s);
    } 
    public static void serviceLogError(String s){
        service.error(s);
    } 
    public static void serviceLogError(String s,Exception e){
        service.error(s,e);
    } 
    /**
     * 数据操作层日志
     */
    public final static Logger dao=Logger.getLogger("daoLog");
    
    public static void daoLogDebug(String s){
        dao.debug(s);
    } 
    public static void daoLogInfo(String s){
        dao.info(s);
    } 
    public static void daoLogError(String s){
        dao.error(s);
    } 
    public static void daoLogError(String s,Exception e){
        dao.error(s,e);
    } 
    /**
     * 数据操作层日志
     */
    public final static Logger job=Logger.getLogger("jobLog");
    
    public static void jobLogDebug(String s){
        job.debug(s);
    } 
    public static void jobLogInfo(String s){
        job.info(s);
    } 
    public static void jobLogError(String s){
        job.error(s);
    } 
    public static void jobLogError(String s,Exception e){
        job.error(s,e);
    } 
    
    /**
     * 搜索操作层日志
     */
    public final static Logger search=Logger.getLogger("searchLog");
    
    public static void searchLogDebug(String s){
        search.debug(s);
    } 
    public static void searchLogInfo(String s){
        search.info(s);
    } 
    public static void searchLogError(String s){
        search.error(s);
    } 
    public static void searchLogError(String s,Exception e){
        search.error(s,e);
    } 
    
    /**
     * 
     * @param logger
     * @param s
     * @param e
     */
    public static void error(Logger logger,String s,Exception e){
        logger.error(s,e);
    } 
    /** 
     * 获取异常的堆栈信息 
     *  
     * @param t 
     * @return 
     */  
    public static void getStackTrace(Throwable t){  
        StringWriter sw = new StringWriter();  
        PrintWriter pw = new PrintWriter(sw);  
        try{  
            t.printStackTrace(pw);  
            log.error(sw.toString());  
        }finally{  
            pw.close();  
        }  
    }

}

第四步:各层控制输出

dao层日志捕获

    @Override
    public Page<AdvPosition> find(Integer pageNum, Integer pageSize,
            String where, Object[] queryParams, Map<String, String> orderBy)throws ServiceException {
        try {
            LogUtil.dao.info("AdvPositionDao.find(...) finished.");
            return this.advPositionDao.find(pageNum, pageSize, where, queryParams, orderBy);
        } catch (DaoException e) {
            LogUtil.dao.error("AdvPositionDao.find(...)" + e.getMessage(),e);
            e.printStackTrace();
        }
        return null;
    }

业务层日志捕获

    /**
     * 分页展示广告位置列表
     *
     * @author <a href='mailto:dennisit@163.com'>Cn.Pudp(En.dennisit)</a> Copy Right since 2014-1-30 下午01:07:40
     *                
     * @param request
     * @param response
     * @param pageNum
     * @return
     */
    @RequestMapping(value={"/advinfoes.html","/advinfoes"},method={RequestMethod.GET,RequestMethod.POST})
    public ModelAndView advInfoList(HttpServletRequest request, HttpServletResponse response){
        Map<String,Object> map = new HashMap<String,Object>();
        Map<String,String> orderBy = new HashMap<String, String>();
        orderBy.put("id", "desc");                //按照id降序排列
        try {
            //查找所有的广告位置列表,查询10条,按照Id降序排列
            Page<AdvInfo> page = this.advInfoService.find(1, BaseMultiController.DEFAULT_PAGE_SIZE, orderBy);
            map.put("page", page);
            LogUtil.ctrl.info("AdvInfoService.find(..) info：" + page);
        } catch (ServiceException e) {
            LogUtil.service.error("AdvInfoService.find(..) error：" + e.getMessage());
            e.printStackTrace();
        }
        return toView("vms/adv_info_list", map);
    }

这样就可以将各层日志输出到各层对应的日志文件记录中了.输出位置可以通过properties文件配置.

转载请注明出处:[http://www.cnblogs.com/dennisit/p/3619549.html]