對於預設直接把配置檔案放任classpath下面，這種henjiandan

首先說下log4j的配置，有兩種方法：

1、在web.xml中配置（推薦）：

<!-- 配置log4j日誌載入檔案 log4j.properties -->
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>webapp.devportal</param-value>
</context-param>
<context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>file:/opt/config/open_portal/opendev/appconfig/log4j.properties</param-value>
    </context-param>
    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>60000</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>
 

2、程式碼配置（耦合性強）：

package com.cmcc.open.devportal.omae.util;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import com.cmcc.open.base.utils.ConfigurationUtil;

public class Log4jConfig {
    private boolean reload = true;  
    private int interval = 60000;  
    private static Logger log = Logger.getLogger(ConfigurationUtil.class);
  
    public Log4jConfig(boolean reload, int interval) {  
        this.reload = reload;  
        this.interval = interval;  
        this.loadConfig();  
    }  
  
    public void loadConfig() {  
        try {
            String log4jPath = "/opt/config/open_portal/opendev/appconfig/log4j.properties"+"";
//InputStream logis =new BufferedInputStream(new FileInputStream("D:/home/jk/platform/dev/webconfig/log4j.properties"));
            // 間隔特定時間，檢測檔案是否修改，自動重新讀取配置  
            //PropertyConfigurator.configure(logis);
            PropertyConfigurator.configureAndWatch(log4jPath, this.interval); 
            log.debug("log4j file path: " + log4jPath);
            
        } catch (Exception e) {
            e.printStackTrace();
        }  
    }  
}
 

配置spring檔案：

<!--配置log4j自動載入日誌-->
    <bean class="com.cmcc.open.utils.Log4jConfig">
        <constructor-arg name="reload" value="true"/>
        <constructor-arg name="interval" value="60000"/>
    </bean>

再說下log4j2.xml的配置方法，這是log4j的2版本的日誌，與1.x不同，也有兩種方法：

1、可執行的jar中指定（未嘗試）：

 <!-- 系統日誌配置監聽器 -->
	<context-param>
	    <description>日誌配置檔案的路徑</description>
	    <param-name>log4jConfigLocation</param-name>
	    <param-value>file:/opt/config/open_portal/openapi/appconfig/log4j2.xml</param-value>
	</context-param>
	<listener>
	    <listener-class>com.cmcc.open.common.Log4j2ConfigListener</listener-class>
	</listener>

package com.cmcc.open.common;
import java.util.Enumeration;

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

import org.apache.logging.log4j.core.config.Configurator;
 
public class Log4j2ConfigListener implements ServletContextListener{
    
    private static final String KEY = "log4jConfigLocation";
 
    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
    }
 
    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        String fileName = getContextParam(arg0);
        Configurator.initialize("Log4j2", fileName);
    }
 
    private String getContextParam(ServletContextEvent event) {
        Enumeration<String> names = event.getServletContext().getInitParameterNames();
        while (names.hasMoreElements()){
            String name = names.nextElement();
            String value = event.getServletContext().getInitParameter(name);
            if(name.trim().equals(KEY)){
                return value;
            }
        }
        return null;
    }
}