如何将主机名附加到log4j.xml中的日志文件 [英] How to append hostname to log file in log4j.xml

问题描述

我要在日志文件名后附加主机名和日期.因此日志文件名应类似于 app_hostname.date.log . 注意:这应该同时在 linux和Windows中运行.

I want to append hostname and date to log file name.So log file Name should be like app_hostname.date.log. Note: This should run in both linux and windows.

<appender name="applog" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="${path}/app.log" />
        <param name="MaxFileSize" value="1MB" />
        <param name="DatePattern" value=".dd-MM-yyyy" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="[%d{dd-MM-yyyy HH:mm:ss}] [%-5p] %m%n"/>
        </layout>
</appender>

以及如何基于日志模式(而不是StringMatchFilter)添加过滤器.我希望模式匹配. 预先感谢

And how to add filter based on the log pattern, not as StringMatchFilter.I want pattern to be matched. Thanks in advance

推荐答案

首先从Java代码执行此操作 然后 配置log4j 到应用程序中，

注意:在执行以下代码时处理或捕获所需的异常.

// step-1 : set hostName into System's property, which will use by log4j
System.setProperty("hostName", InetAddress.getLocalHost().getHostName()); 
//step - 2 : set currentDate into System's property, which will use by log4j
System.setProperty("currentDate", new SimpleDateFormat("dd-MMM-yyyy").format(new Date()));
//step - 3 : now configure/load log4j into Application , if it's not still loaded earlier then.
org.apache.log4j.Logger LOG = Logger.getLogger(YourJavaClassName.class); // ALERT : before this step above 2-step must needs to be execute, otherwise file-name won't appear as you required.

//LOG.debug("anything whatever programmer what to log");

已更新:

如果您的应用程序是网络应用程序， 然后需要配置在tomcat-server开始之后和任何application运行之前我们想要的属性

If your application is web-application, then need to configure property which we want here aftertomcat-server start and before any application run,

为此创建一个类ApplicationConfiguration，该类已实现ServletContextListener接口，该接口有助于在任何应用程序运行之前先运行.

for that create one class ApplicationConfiguration which has ServletContextListener interface implemented which helps here to run first before any application runs.

也这样做，

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class ApplicationConfiguration implements ServletContextListener{

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void contextInitialized(ServletContextEvent arg0) {

        try {
            // step-1 : set hostName into System's property, which will use by log4j
            System.setProperty("hostName", InetAddress.getLocalHost().getHostName());
            //step - 2 : set currentDate into System's property, which will use by log4j
            System.setProperty("currentDate", new SimpleDateFormat("dd-MMM-yyyy").format(new Date()));
        } catch (UnknownHostException e) {
            System.out.println("Error Message : " + e.getMessage());
            //e.printStackTrace();
        } 


    }


}

......

同样设置您的log4j.xml文件，

Set your log4j.xml file likewise,

<appender name="applog" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="${path}/app_${hostName}.${currentDate}.log" />
        <param name="MaxFileSize" value="1MB" />
        <param name="DatePattern" value=".dd-MM-yyyy" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="[%d{dd-MM-yyyy HH:mm:ss}] [%-5p] %m%n"/>
        </layout>
</appender>

请相应地更新web.xml文件，

please, update web.xml file accordingly,

<web-app ...>
   <listener>
    <listener-class>
             com.pck1.ApplicationConfiguration
        </listener-class>
   </listener>
</web-app>

此配置需要应用到web.xml，因为应用 启动时，通过此配置，它将像 上下文侦听器.

This configuration need to apply into web.xml because application when start, by this configuration it will follow it like Context-listener.

---

更新2:

<logger name="packageName.AAA" additivity="false" >
    <level value="INFO" />
    <appender-ref ref="applog"/>
 </logger>

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