使用log4j-web.jar

时间:2016-07-23 08:25:22

标签: java maven web log4j2

我正在尝试通过以下教程在我的webapplication中配置log4j2。我正在使用glassfish 4.1.1服务器和servlet版本3.1。我可以使用以下配置配置日志记录功能:

log4j.properties

     # Root logger option
     log4j.rootLogger=INFO, consoleAppender, fileAppender

     # debug level logger
     log4j.logger.kumar.suraj.college.administration.login=DEBUG

     # Redirect log messages to console
     log4j.appender.consoleAppender=org.apache.log4j.ConsoleAppender
     log4j.appender.consoleAppender.Target=System.out
     log4j.appender.consoleAppender.layout=org.apache.log4j.PatternLayout
     log4j.appender.consoleAppender.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

     # Redirect log messages to a log file, support file rolling.
     log4j.appender.fileAppender=org.apache.log4j.DailyRollingFileAppender
     log4j.appender.fileAppender.File=E:\\DEVELOPMENT\\JAVA\\web-logs\\web-college-administration\\applicationLogs.log
     log4j.appender.fileAppender.layout=org.apache.log4j.PatternLayout
     log4j.appender.fileAppender.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

属性文件放在src / main / resources文件夹中

的web.xml

        <?xml version="1.0" encoding="UTF-8"?>
        <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee   http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID"   version="3.1">
       <display-name>College Administration</display-name>
       <!--     <context-param>
                    <param-name>log4jConfiguration</param-name>
                    <param-value>/log4j.properties</param-value>
                </context-param>is it required
         -->
       <!--from where is this class referenced in dependency without web -->
       <listener>
            <listener-class>org.apache.logging.log4j.web.Log4jServletContextListener</listener-class>
       </listener>
      <servlet>
          <servlet-name>loginServlet</servlet-name>
          <servlet-class>kumar.suraj.college.administration.login.LoginServlet</servlet-class>
      </servlet>
      <servlet-mapping>
          <servlet-name>loginServlet</servlet-name>
          <url-pattern>/login</url-pattern>
      </servlet-mapping>

      </web-app>

定义文件位置的上下文参数被注释掉。可能log4j默认查找名为log4j.properties的文件。但是,只是想知道它是否是指定文件位置的正确方法。

此外,我不确定哪个jar是org.apache.logging.log4j.web.Log4jServletContextListener被引用。我搜索了所有jar文件但找不到这个类。

LoginServlet.java

   package kumar.suraj.college.administration.login;

   import java.io.IOException;
   import javax.servlet.ServletException;
   import javax.servlet.http.HttpServlet;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   import org.apache.log4j.Logger;

   import kumar.suraj.college.administration.adduser.AddUserServlet;

   public class LoginServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;

        // final static Logger logger = LogManager.getLogger(LoginServlet.class);
        final static Logger logger = Logger.getLogger(LoginServlet.class);

        public LoginServlet() {
           super();
        }

        @Override
        protected void doGet(final HttpServletRequest request, final     HttpServletResponse response)
        throws ServletException, IOException {
           LoginServlet.logger.debug("debug level logging supported");              response.getWriter().append("Servedat:").append(request.getContextPath());
    response.getWriter().append("Hello Suraj");
}

       @Override
       protected void doPost(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
               LoginServlet.logger.debug("debug level logging supported");
               this.doGet(request, response);
       }
  }

log4j的pom.xml依赖

    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>

所有这一切都很好,我在控制台和文件中都可以获得日志。但是当我尝试按照以下链接更改配置时:

https://logging.apache.org/log4j/2.x/manual/webapp.html#Servlet-3.0 https://logging.apache.org/log4j/2.x/maven-artifacts.html

与之前指定的依赖性不同,我转而使用

        <dependency>
           <groupId>org.apache.logging.log4j</groupId>
           <artifactId>log4j-web</artifactId>
           <version>2.6.2</version>
        </dependency>

log4j-api和log4j-core作为传递依赖项添加到log4j-web.jar

我在LoginServlet.java中做的其他更改是由于我在切换到log4j-web.jar后得到的编译时错误,如下所示:

     import org.apache.logging.log4j.LogManager;
     import org.apache.logging.log4j.Logger;


     public class LoginServlet extends HttpServlet {
         private static final long serialVersionUID = 1L;
         final static Logger logger = LogManager.getLogger(LoginServlet.class);
         // final static Logger logger = Logger.getLogger(LoginServlet.class);

主要的变化是logger变量和两个导入的初始化。休息所有配置保持原样。此外,我能够在log4j-web.jar中找到web.xml中指定的侦听器类。仍然记录不适用于此配置。

有人可以帮助我,或者告诉我这里我做错了什么?

1 个答案:

答案 0 :(得分:3)

好的,经过一些研究并重新阅读我之前提到的链接后,我终于设法在我的Web应用程序中配置log4j2,现在我按预期获取日志。现在想提一下我做错了什么。

如链接https://logging.apache.org/log4j/2.x/manual/webapp.html

中所述

如果我使用servlet 3.0或更高版本,我不需要在部署描述符中注册Log4jServletContextListener类,它只需要在servlet 2.5及更低版本中注册。如果我遵守log4j2的命名约定,我也不需要提供文件位置。

另一个更改而不是log4j2.properties现在我使用log4j2.xml,因为log4j2中属性文件的格式与log4j1中使用的格式不同。感谢下面链接中给出的答案,这些答案帮助我解决了这个问题。 Log4j 2 doesn't support log4j.properties file anymore?

对于支持的当前格式,请参阅链接https://logging.apache.org/log4j/2.0/manual/configuration.html#Properties

以下是我的部署描述符和log4j configuartion文件现在的样子:

的web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
   <display-name>College Administration</display-name>
  <servlet>
      <servlet-name>loginServlet</servlet-name>
      <servlet-class>kumar.suraj.college.administration.login.LoginServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>loginServlet</servlet-name>
      <url-pattern>/login</url-pattern>
  </servlet-mapping>

  </web-app>

log4j2.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE xml>
    <Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
           <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
        </Console>
        <File name="File" fileName="E:\\DEVELOPMENT\\JAVA\\web-logs\\web-college-administration\\applicationLogs.log">
           <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>    
        </File>
     </Appenders>
     <Loggers>
     <Root level="debug">
         <AppenderRef ref="Console"/>
         <AppenderRef ref="File"/>
     </Root>
     </Loggers>
     </Configuration>