This article is just a simple introduction to spring MVC.
Environment and jar package preparation
1. ide-eclipse3.7
2. Spring:
3.2.3 is a newer version of spring. Currently, the highest version is 4.0.0.
Why are the addresses of two versions provided here?
The reason is:
Spring requires support from other dependent packages, such as log4j and jstl,
In the spring version release, some versions have released dependency packages synchronously, but some have not. Versions 3.0.2 and 3.2.3 are available. (It may be because the dependent package has not been changed)
If you only want to learn, you can download version 3.0.2. If you want to use the latest version of spring for development, you can use the latest version of spring and the old version of the dependent package.
The example here is very simple. Spring MVC is used to switch from an index. jsp page to a login page (login. jsp ).
Procedure1. Create a dynamic web project under eclipse.
(The project name is springweb ")
2. Copy the downloaded spring package and dependency package to the project's webcontent/WEB-INF/lib.
3. Modify the Web. xml file under the WEB-INF
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>springweb</display-name> <servlet> <servlet-name>spring-dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:com/oscar999/resource/spring-dispather.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring-dispatcher</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
The core controller is configured here to intercept *. Do requests and submit them to spring for processing,
The processing is based on the spring-dispather.xml document.
The configuration method of this file is: classpath *: COM/oscar999/resource/spring-dispather.xml, that is, the path of the configuration XML file, under the com. oscar999.resource package of javasrc.
4. Add index. jsp
Add index. jsp in the webcontent path
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">It is easy to import directly to the logon page after entering the home page.
Note that the page here is not login. jsp, but login. Do
5. added the xml configuration file required by the IOC container.
That is the spring-dispather.xml file mentioned above. The file name and path can be specified or not.
If no path or name is specified: only spring will automatically go to the/WEB-INF directory to find the file named <servlet-Name>-servlet. xml.
Specify the path and name as described above.
Add a package for com. oscar999.resource under Java SRC. Add a spring-dispather.xml with the following content:
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util-3.1.xsdhttp://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="login.do">loginController</prop> </props> </property> </bean> <bean id="loginController" class="org.springframework.web.servlet.mvc.ParameterizableViewController"> <property name="viewName" value="login" /> </bean> <bean class="org.springframework.web.servlet.view.UrlBasedViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> </beans>An action and controller are defined here,
When the action is "login. Do", use logincontroller to find that the viewname is "login", and then use urlbasedviewresolver.
Finally, the JSP processing this action is =>/WEB-INF/JSP/login. jsp
6. Create login. jsp
The content here does not matter;
<% @ Page Language = "Java" contenttype = "text/html; charset = UTF-8" pageencoding = "UTF-8" %> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en" "http://www.w3.org/TR/html4/loose.dtd"> <HTML>Summary
In this example, we only use *. Do to replace *. jsp.
Then configure the *. Do action in XML to use which JSP.
It seems that C and V are separated.
More advantages of spring require deep learning ....
Additional1.
Above
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="login.do">loginController</prop> </props> </property> </bean> <bean id="loginController" class="org.springframework.web.servlet.mvc.ParameterizableViewController"> <property name="viewName" value="login" /> </bean>Can be replaced by the following methods or
<bean name="/login.do" class="org.springframework.web.servlet.mvc.ParameterizableViewController"> <property name="viewName" value="login" /> </bean>2.Urlfilenameviewcontroller
The Controller parses XXX. Do into XXX. jsp.
3.Parameterizableviewcontroller: Create a controller with a parameterized View
You can configure the property of viewname to configure the view name.
The preceding example can be login or login2. You can create a corresponding JSP.
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