01-spring MVC Overview and Configuration Dispatcherservlet

1.Spring MVC is based on MODEL2 implementation, the overall framework process such as (image from Baidu):

　　

The ①web container receives an HTTP request, and if it matches the Dispatcherservlet request mapping Path (Web. xml), the container is given dispatcherservlet processing.

The ②dispatcherservlet finds the handler to process the request based on the requested information and the configuration of the handlermapping (similar to the routing feature).

③handler adapter encapsulates the Handler and calls the Handler method using a uniform method

After the ④ processor completes the business logic, it returns a Modelandview to Dispatcherservlet,modelandview that contains the view logical name and the model data information.

⑤modelandview contains the logical view name, Dispatcherservlet the parsing of the logical view to the real view by Viewresolver

⑥ The View object is real, Dispatcherservlet uses this view object to render the view of the model data in Modelandview.

The ⑦ client eventually gets HTML or PDF, and so on.

2. Configure Dispatcherservlet

    <Context-param>        <Param-name>Contextconfiglocation</Param-name>        <Param-value>Classpath:/conf/applicationcontext.xml</Param-value>    </Context-param>    <Listener>        <Listener-class>Org.springframework.web.context.ContextLoaderListener</Listener-class>    </Listener>    <servlet>        <Servlet-name>Viewspace</Servlet-name>        <Servlet-class>Org.springframework.web.servlet.DispatcherServlet</Servlet-class>        <Load-on-startup>1</Load-on-startup>    </servlet>    <servlet-mapping>        <Servlet-name>Viewspace</Servlet-name>        <Url-pattern>*.html</Url-pattern>    </servlet-mapping>

Note: Configuring Dispatcherservlet, named Viewspace, automatically loads the <servlet-name>-servlet.xml configuration file by default.

A Web. XML can be configured with multiple Dispatcherservlet to handle different requests through servlet-mapping.

If you do not want to load the default <servlet-name>-servlet.xml, you can also display the specified:

    <!--Spring MVC Servlet -    <servlet>        <Servlet-name>Springservlet</Servlet-name>        <Servlet-class>Org.springframework.web.servlet.DispatcherServlet</Servlet-class>        <Init-param>            <Param-name>Contextconfiglocation</Param-name>            <Param-value>/web-inf/spring-mvc.xml</Param-value>        </Init-param>        <Load-on-startup>1</Load-on-startup>    </servlet>

01-spring MVC Overview and Configuration Dispatcherservlet