spring mvc入门

要学习使用spring mvc有几个简单的要领，spring mvc的架构很简单地想是透过一个共通的入口DispatcherServlet来接受所有的request，接着依request要求的页面透过handler转送给Controller处理；待Controller处理完毕后，再将结果丢让View呈页出来。大致上的示意图如下(ps. 俺不会uml只是常看大家这样用, 有错的话和我说一声啊。):



身为library user的我们，只需要在每一个流程中贡献一点心力。就能让spring mvc跑了起来

DispatcherServlet

DispathcerServlet

的角色就好像是一个任意门，他位于spring mvc的"入口"想到那跟他说就对了。但是要使用任意门，您必需先安上他。要怎么按上呢? DispatcherServlet本身其实是一个Servlet，所以我们要做的事就是在web.xml中布署他。就如同一般Servlet布署的方式一样，描述servlet的名字和类别，再给他一个mapping描述适用的网页。

<? xml version = " 1.0 "  encoding = " UTF-8 " ?>
<! DOCTYPE web - app PUBLIC  ' -//Sun Microsystems, Inc.//DTD Web Application 2.3//EN '' http://java.sun.com/dtd/web-app_2_3.dtd ' >
 
< web - app >
  < servlet >
     < 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 >* .htm </ url - pattern >
  </ servlet - mapping >
</ web - app >

 

<? xml version = " 1.0 "  encoding = " UTF-8 " ?>
<! DOCTYPE beans PUBLIC  " -//SPRING//DTD BEAN//EN "" http://www.springframework.org/dtd/spring-beans.dtd " >
 
<!--
  -  Application context definition  for " dispatcher "  DispatcherServlet.
  -->
 
< beans >
     < bean id = " helloController "   class = " HelloController " />

     < bean id = " urlMapping "   class = " org.springframework.web.servlet.handler.SimpleUrlHandlerMapping " >
         < property name = " mappings " >
             < props >
                 < prop key = " /hello.htm " > helloController </ prop >
             </ props >
         </ property >
     </ bean >

     < bean id = " viewResolver "   class = " org.springframework.web.servlet.view.UrlBasedViewResolver " >
         < property name = " viewClass " >< value > org.springframework.web.servlet.view.JstlView </ value ></ property >
         < property name = " prefix " >< value >/ WEB - INF / jsp /</ value ></ property >
         < property name = " suffix " >< value > .jsp </ value ></ property >
     </ bean >

</ beans >