爲了適應目前框架的插件啓動機制(同一平臺不同項目加載不同插件和配置文件),不得不想辦法讓插件來選擇性的加載spring配置文件,我是通過重寫spring監聽器來實現加載自定義配置文件。
一、首先,重寫類的主要代碼(主要在中文註釋處):
public class ShineContextLoaderListener extends ContextLoaderListener{
private ContextLoader contextLoader;
@Override
protected WebApplicationContext createWebApplicationContext(ServletContext sc, ApplicationContext parent) {
// return super.createWebApplicationContext(sc, parent);
Class<?> contextClass = determineContextClass(sc);
if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) {
throw new ApplicationContextException("Custom context class [" + contextClass.getName() +
"] is not of type [" + ConfigurableWebApplicationContext.class.getName() + "]");
}
ConfigurableWebApplicationContext wac =
(ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass);
// Assign the best possible id value.
if (sc.getMajorVersion() == 2 && sc.getMinorVersion() < 5) {
// Servlet <= 2.4: resort to name specified in web.xml, if any.
String servletContextName = sc.getServletContextName();
wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
ObjectUtils.getDisplayString(servletContextName));
}
else {
// Servlet 2.5's getContextPath available!
try {
String contextPath = (String) ServletContext.class.getMethod("getContextPath").invoke(sc);
wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
ObjectUtils.getDisplayString(contextPath));
}
catch (Exception ex) {
throw new IllegalStateException("Failed to invoke Servlet 2.5 getContextPath method", ex);
}
}
//將默認的spring配置文件與插件注入的配置文件融合
String configLocation = sc.getInitParameter(CONFIG_LOCATION_PARAM); //這裏獲取到web.xml中通過param配置的spring配置文件路徑
String fusionConfigLocation = ConfigFactory.getFactory().fusionSpringXml(configLocation, "Spring"); //將動態加載的spring配置文件和默認的配置文件拼接在一起
/* 這裏拼出結果類似:classpath:com/shine/docs/config/dbSpring.xml,classpath:com/shine/jbpm/config/jbpmSpring.xml */
wac.setParent(parent);
wac.setServletContext(sc);
wac.setConfigLocation(fusionConfigLocation); //設置配置文件路徑爲拼接後的值
customizeContext(sc, wac);
wac.refresh();
return wac;
}
/**
* Initialize the root web application context.
*/
public void contextInitialized(ServletContextEvent event) {
//初始化系統配置,將啓動時需要的配置文件加載到系統全局變量中
ConfigFactory.getFactory().init(event.getServletContext());
this.contextLoader = createContextLoader();
if (this.contextLoader == null) {
this.contextLoader = this;
}
this.contextLoader.initWebApplicationContext(event.getServletContext());
}
}
二、將web.xml中的配置的spring監聽器改成重寫後的類
<!--
Spring監聽器,原class:org.springframework.web.context.ContextLoaderListener
contextConfigLocation值已改成通過插件加載,在此處保留的話不要與插件中加載的衝突
如果同時使用SpringMvc則注意不要重複加載
-->
<listener>
<listener-class>com.shine.spring.ShineContextLoaderListener</listener-class>
</listener>
<!--
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
-->
OK,主要就是這樣。