Servlet gets ApplicationContext

In general, the injection is done using spring, and in the service or SPRINGMVC, the spring's injected spring bean can be fetched in the form of annotations as shown below:

@Resource (name = "Userinfomapper")
Private Userinfomapper Userinfomapper;

But there are situations like how to get the object in a servlet, because SPRINGMVC is servlet-based, and all requests are processed first through a default servlet- Org.springframework.web.servlet.DispatcherServlet (this option must be configured when configuring SPRINGMVC in Web. xml), the manually created servlet cannot automatically get the injected bean. Need to get through ApplicationContext ApplicationContext:

This.xmlpacker = ((ixmlpacker) This.applicationContext.getBean ("Xmlpacker"));

The ApplicationContext method is to add a listener, which is initialized when the context is complete, and is implemented in the following way:

Inherit Servletcontextlistener, rewrite contextinitialized, assign value to Webctx.

Package com.casic.servlet;

Import javax.servlet.ServletContextEvent;
Import Javax.servlet.ServletContextListener;
Import Org.springframework.context.ApplicationContext;
Import Org.springframework.web.context.support.WebApplicationContextUtils;

public class Applicationcontextinit implements Servletcontextlistener {
private static ApplicationContext webctx = null;

public void contextdestroyed (Servletcontextevent event) {
}

public void contextinitialized (Servletcontextevent event) {
Webctx = Webapplicationcontextutils.getwebapplicationcontext (Event.getservletcontext ());
}

public static ApplicationContext Getwebapplicationcontext () {
return webctx;
}

public static void Setwebctx (ApplicationContext webctx) {
Webctx = Webctx;
}
}

adding listeners to Web. xml

<listener>

<listener-class>com.casic.servlet.ApplicationContextInit</listener-class>
</listener>

The servlet uses Applicationcontextinit.getwebapplicationcontext () in the Init () function to obtain

public void Init () throws Servletexception {
if (This.applicationcontext = = null) {
This.applicationcontext = Applicationcontextinit.getwebapplicationcontext ();
This.xmlpacker = ((ixmlpacker) This.applicationContext.getBean ("Xmlpacker"));
}
}

Servlet gets ApplicationContext