Tomcat + spring 使用站外的配置文件

对于配置文件我们原来使用spring的applicationContext.xml来配置

        <bean

  class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

  <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />

  <property name="ignoreResourceNotFound" value="true" />

  <property name="locations">

   <list>

    <!-- standard configuration -->

    <value>classpath*:/application.properties</value>

    <!-- local dev configuration -->

    <value>classpath*:/application.local.properties</value>

    <!-- production server configuration -->

    <value>classpath*:application.server.properties</value>

    <   </list>

  </property>

 </bean>

原来的配置文件是放在src/main/resources/application.properties 下面的, 但在生产/测试服务器中部署的话经常要要改动该配置文件, 先解包然后再改于是客户提出要求把配置文件放到站外.

修改如下

value>file:/var/myapp/application.server.properties</value>

但客户要求不能硬编码外部配置文件的路径, 并把这个路径放在tomcat的配置里面. 于是想改成

<value>file:${yourpath}/application.server.properties</value>

这种形式, 但这样要求yourpath为系统变量. 最后的解决方案是在tomcat的<tomcatHome>/conf/context.xml中添加一个环境变量, 然后重写了一个ContextLoaderListener

最后的配置为

<tomcatHome>/conf/context.xml

<Environment name="yourConfigPath" value="E:/"

type="java.lang.String" override="false" />

applicationContext.xml

...

<bean

class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />

<property name="ignoreResourceNotFound" value="true" />

<property name="locations">

<list>

<!-- standard configuration -->

<value>classpath*:/application.properties</value>

<!-- local dev configuration -->

<value>classpath*:/application.local.properties</value>

<!-- production server configuration -->

<value>file:${yourConfigPath}/application.properties</value>

</list>

</property>

</bean>

...

web.xml

        <context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:applicationContext.xml</param-value>

</context-param>

<!-- use our listener to replace the spring listen -->

<listener>

<listener-class>com.barry.listener.ContextLoaderListener</listener-class>

</listener>

<!--

<listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

-->

ContextLoaderListener.java

packagecom.barry.listener;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import org.springframework.web.context.ContextLoader;

/**

* Bootstrap listener to start up Spring's root {@link WebApplicationContext}.

* Simply delegates to {@link ContextLoader}.

*

*

* @author barry.diao

*/

public class ContextLoaderListener implements ServletContextListener

{

private ContextLoader contextLoader;

/**

* Initialize the root web application context.

* @param event ServletContextEvent

*/

public void contextInitialized(ServletContextEvent event)

{

Context initCtx;

try

{

initCtx = new InitialContext();

Context envCtx = (Context) initCtx.lookup("java:comp/env");

String config = null;

config = (String) envCtx.lookup("yourConfigPath");

System.setProperty("yourConfigPath", config);

envCtx.close();

initCtx.close();

}

catch (NamingException e)

{

// e.printStackTrace();

System.setProperty("yourConfigPath", "");

}

catch (Exception ex)

{

// ex.printStackTrace();

System.setProperty("yourConfigPath", "");

}

this.contextLoader = createContextLoader();

this.contextLoader.initWebApplicationContext(event.getServletContext());

}

/**

* Create the ContextLoader to use. Can be overridden in subclasses.

*

* @return the new ContextLoader

*/

protected ContextLoader createContextLoader()

{

return new ContextLoader();

}

/**

* Return the ContextLoader used by this listener.

*

* @return the current ContextLoader

*/

public ContextLoader getContextLoader()

{

return this.contextLoader;

}

/**

* Close the root web application context.

* @param event ServletContextEvent

*/

public void contextDestroyed(ServletContextEvent event)

{

if (this.contextLoader != null)

{

this.contextLoader.closeWebApplicationContext(event.getServletContext());

}

}

}