web.xml configured in load priority context-param -> listener -> filter -> servlet
1. context-param, which is used to provide ServletContext key pair, i.e., the application context information. Our listener, filter, etc. will be used in the initialization information in these contexts it is context-param first loaded .
2. Listener load
-
<listener>
-
<listener-
class>org.springframework.web.context.ContextLoaderListener</listener-class>
-
</listener>
Spring provides an implementation class ServletContentListener ContextLoaderListener listener, such as Listener used, starting Tomcat
When vessel, such action is automatically loaded ApplicationContext configuration information, and if not it will set the initial parameters contextConfigLocation
using default parameters WEB -INF application.xml file in the path. If you need to read a plurality of profiles to customize or modify the default path, can web.xml
settings:
3. filter loading
4. the servlet is loaded
-
<! - Front Controller ->
-
<servlet>
-
<! - here's the name and the name of the configuration file should front of a container, like, behind the "-servlet.xml" compiler automatically filled ->
-
<servlet-name>dispatcher</servlet-name>
-
<servlet-
class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
-
<load-on-startup>1</load-on-startup>
-
</servlet>
web.xml Configuration
-
<?xml version=
"1.0" encoding=
"UTF-8"?>
-
<web-app xmlns=
"http://xmlns.jcp.org/xml/ns/javaee"
-
xmlns:xsi=
"http://www.w3.org/2001/XMLSchema-instance"
-
xsi:schemaLocation=
"http://xmlns.jcp.org/xml/ns/javaee
-
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
-
version=
"3.1"
-
metadata-complete=
"true">
-
<! - Listener ->
-
<listener>
-
<listener-
class>org.springframework.web.context.ContextLoaderListener</listener-class>
-
</listener>
-
<! - Root container / context container ->
-
<context-param>
-
<param-name>contextConfigLocation</param-name>
-
<param-value>/WEB-INF/applicationContext.xml</param-value>
-
</context-param>
-
<! - Front Controller ->
-
<servlet>
-
<! - here's the name and the name of the configuration file should front of a container, like, behind "- the servlet . Xml " compiler automatically filled ->
-
<servlet-name>dispatcher</servlet-name>
-
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
-
<load-on-startup>1</load-on-startup>
-
</servlet>
-
<servlet-mapping>
-
<servlet-name>dispatcher</servlet-name>
-
<url-pattern>/</url-pattern>
-
</servlet-mapping>
-
-
</web-app>
-
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web.xml configured in load priority context-param -> listener -> filter -> servlet