Log4j简单配置

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2024-08-02 13:51:51 222人阅读

Log4j是一组强大的日志组件，在项目中时常需要用它提供一些信息，这两天学习了一下它的简单配置。

第一步，我们需要导入log4j-1.2.14.jar到lib目录下

第二步，在src下建立log4j.properties文件。添加如下内容

 1 log4j.properties 2 log4j.rootLogger =INFO,stdout 3 log4j.logger.sedion=INFO,db 4 log4j.logger.W=WARN,W 5 log4j.logger.E=ERROR,E 6  7 #输出到控制台 8 log4j.appender.stdout = org.apache.log4j.ConsoleAppender 9 log4j.appender.stdout.Target = System.out10 log4j.appender.stdout.layout = org.apache.log4j.PatternLayout11 log4j.appender.stdout.layout.ConversionPattern =  %d{ABSOLUTE} %5p %c{1}:%L - %m%n12 13 #输出WARN级别日志14 log4j.appender.W =org.apache.log4j.RollingFileAppender15 log4j.appender.W.File =${catalina.home}/logs/Test/Test_W.log16 log4j.appender.W.Append =true17 log4j.appender.W.Threshold =WARN18 log4j.appender.W.layout = org.apache.log4j.PatternLayout19 log4j.appender.W.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n20 21 #输出ERROR级别日志22 log4j.appender.E = org.apache.log4j.RollingFileAppender23 log4j.appender.E.File = ${catalina.home}/logs/Test/Test_E.log24 log4j.appender.E.Append = true25 log4j.appender.E.layout = org.apache.log4j.PatternLayout26 log4j.appender.E.layout.ConversionPattern =%-d{yyyy-MM-dd HH\:mm\:ss}  [ %t\:%r ] - [ %p ]  %m%n27  28 #######################29  30 # JDBC Appender  31  32 ####################### 33 log4j.appender.db=org.apache.log4j.jdbc.JDBCAppender34 log4j.appender.db.BufferSize=135 log4j.appender.db.driver=com.mysql.jdbc.Driver36 log4j.appender.db.URL=jdbc:mysql://localhost:3306/test37 log4j.appender.db.user=root38 log4j.appender.db.password=12339 log4j.appender.db.sql=insert into operate_log(class,method,createtime,loglevel,logmsg,username) values ("%C","%M","%d{yyyy-MM-dd HH\:mm\:ss}","%p","%m","%X{username}")

40 log4j.appender.db.layout=org.apache.log4j.PatternLayout

新建一个数据库test和一张日志表operate_log。


可以看到数据库中有个username动态字段，所以我们要写个过滤器

 1 package config.filter; 2  3 import java.io.IOException; 4  5 import javax.servlet.Filter; 6 import javax.servlet.FilterChain; 7 import javax.servlet.FilterConfig; 8 import javax.servlet.ServletException; 9 import javax.servlet.ServletRequest;10 import javax.servlet.ServletResponse;11 import javax.servlet.http.HttpServletRequest;12 13 import org.apache.log4j.MDC;14 15 16 public class Log4jFilter implements Filter17 {18     private final static int DEDAULT_USERID = 0;19     public void destroy()20     {21         22     }23 24     public void doFilter(ServletRequest req, ServletResponse rep,25             FilterChain chain) throws IOException, ServletException 26     {27         HttpServletRequest request = (HttpServletRequest)req;28         String username = request.getParameter("username");29         30         if(username == null)31         {32             MDC.put("username", DEDAULT_USERID);33         }34         else35         {                    36                 System.out.println("登陆名--"+username);37                 MDC.put("username", username);            38         }39         40         41         chain.doFilter(req, rep);42     }43 44     public void init(FilterConfig arg0) throws ServletException 45     {46         47     }48 49 50 }

然后需要在web.xml中进行log4j.properties和过滤器的配置.

<!-- log4j配置 -->    <context-param>        <param-name>log4jConfigLocation</param-name>        <param-value>classpath:log4j.properties</param-value>    </context-param>     <listener>       <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>    </listener>    <!-- 过滤器配置 -->     <filter>         <filter-name>LogResFilter</filter-name>         <filter-class>config.filter.Log4jFilter</filter-class>     </filter>    <filter-mapping>        <filter-name>LogResFilter</filter-name>        <url-pattern>*.do</url-pattern>    </filter-mapping>

第三步，至此我们配置已经全部完成，简单写个登陆来验证一下。

jsp页面很简单，代码便不列出来了.

写个登陆实现类.

package sedion.zhr.controller;import java.util.List;import javax.annotation.Resource;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.log4j.Logger;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import sedion.zhr.beans.UserBean;import sedion.zhr.service.iml.UserServiceIml;@Controller@RequestMapping("/action")public class LoginController {        private static final Logger log_w= Logger.getLogger("W");    private static final Logger log_e = Logger.getLogger("E");    private Log logger = LogFactory.getLog(this.getClass());          @Resource(name = "UserService")    private UserServiceIml serviceIml;     @RequestMapping("/login.do")    public String login(UserBean bean,HttpServletRequest request,HttpServletResponse response) throws Exception    {                 List<UserBean> beans = this.serviceIml.finduser(new String[]{bean.getUsername(),bean.getPassword()});             if(!beans.isEmpty())        {                        log_w.warn("登陆成功--");            logger.info("登陆成功");            return "/index";        }        else        {            log_e.error("登陆失败--");                        logger.error("登陆失败");            return "/login";        }          }}