log4j2.xml和log4j.properties的指定配置路径方法
对于默认直接把配置文件放任classpath下面，这种henjiandan
首先说下log4j的配置，有两种方法：
1、在web.xml中配置（推荐）：
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<context-param>
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<param-name>webAppRootKey
param-name>
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<param-value>webapp.devportal
param-value>
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context-param>
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<context-param>
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<param-name>log4jConfigLocation
param-name>
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<param-value>file:/opt/config/open_portal/opendev/appconfig/log4j.properties
param-value>
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context-param>
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<context-param>
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<param-name>log4jRefreshInterval
param-name>
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<param-value>60000
param-value>
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context-param>
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<listener>
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<listener-class>org.springframework.web.util.Log4jConfigListener
listener-class>
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listener>
2、代码配置（耦合性强）：
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package com.cmcc.open.devportal.omae.util;
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import org.apache.log4j.Logger;
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import org.apache.log4j.PropertyConfigurator;
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import com.cmcc.open.base.utils.ConfigurationUtil;
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public
class Log4jConfig {
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private
boolean reload =
true;
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private
int interval =
60000;
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private
static Logger log = Logger.getLogger(ConfigurationUtil.class);
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public Log4jConfig(boolean reload, int interval) {
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this.reload = reload;
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this.interval = interval;
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this.loadConfig();
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}
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public void loadConfig() {
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try {
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String log4jPath =
"/opt/config/open_portal/opendev/appconfig/log4j.properties"+
"";
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//InputStream logis =new BufferedInputStream(new FileInputStream("D:/home/jk/platform/dev/webconfig/log4j.properties"));
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// 间隔特定时间，检测文件是否修改，自动重新读取配置
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//PropertyConfigurator.configure(logis);
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PropertyConfigurator.configureAndWatch(log4jPath,
this.interval);
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log.debug(
"log4j file path: " + log4jPath);
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}
catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
配置spring文件：
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<bean class="com.cmcc.open.utils.Log4jConfig">
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<constructor-arg name="reload" value="true"/>
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<constructor-arg name="interval" value="60000"/>
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bean>
再说下log4j2.xml的配置方法，这是log4j的2版本的日志，与1.x不同，也有两种方法：
1、可运行的jar中指定（未尝试）：
import
org.apache.logging.log4j.LogManager;
import
org.apache.logging.log4j.core.LoggerContext;
..........
//省略
LoggerContext logContext = (LoggerContext) LogManager.getContext(
false
);
File conFile =
new
File(
"conf/logs/log4j2.xml"
);
logContext.setConfigLocation(conFile.toURI());
logContext.reconfigure();
logger.debug(
"hello world...{}"
,
"How are you"
);
........
//省略
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<context-param>
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<description>日志配置文件的路径
description>
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<param-name>log4jConfigLocation
param-name>
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<param-value>file:/opt/config/open_portal/openapi/appconfig/log4j2.xml
param-value>
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context-param>
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<listener>
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<listener-class>com.cmcc.open.common.Log4j2ConfigListener
listener-class>
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listener>
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package com.cmcc.open.common;
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import java.util.Enumeration;
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import javax.servlet.ServletContextEvent;
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import javax.servlet.ServletContextListener;
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import org.apache.logging.log4j.core.config.Configurator;
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public
class Log4j2ConfigListener implements ServletContextListener{
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private
static
final String KEY =
"log4jConfigLocation";
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@Override
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public void contextDestroyed(ServletContextEvent arg0) {
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}
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@Override
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public void contextInitialized(ServletContextEvent arg0) {
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String fileName = getContextParam(arg0);
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Configurator.initialize(
"Log4j2", fileName);
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}
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private String getContextParam(ServletContextEvent event) {
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Enumeration
names = event.getServletContext().getInitParameterNames();
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while (names.hasMoreElements()){
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String name = names.nextElement();
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String value = event.getServletContext().getInitParameter(name);
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if(name.trim().equals(KEY)){
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return value;
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}
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}
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return
null;
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}
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}