Spring MVC的配置文件(XML)的几个经典案列

1.既然是配置文件版的,那配置文件自然是必不可少,且应该会很复杂,那我们就以一个一个的来慢慢分析这些个经典案列吧!

01.实现Controller

/*
 * 控制器
 */
public class MyController implements Controller{

    /*
     * 返回视图
     * (non-Javadoc)
     * @see org.springframework.web.servlet.mvc.Controller#handleRequest(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        ModelAndView mv=new ModelAndView();
        mv.addObject("msg", "happy");
        mv.setViewName("jd");
        return mv;
    }

}

    <!-- 外部资源 -->
    <!--<bean id="jd" class="org.springframework.web.servlet.view.RedirectView">
     <property name="url" value="http://www.jd.com"></property>
    </bean>-->

    <!-- 内部资源 -->
     <!--<bean id="internal" class="org.springframework.web.servlet.view.JstlView">
     <property name="url" value="/WEB-INFO/jsp/happy.jsp"></property>
    </bean>-->

    <!-- 引用外部资源 即将上面的外部与内部资源放到外面的配置文件中去-->
    <bean class="org.springframework.web.servlet.view.XmlViewResolver">
     <property name="location" value="classpath:MyView.xml"></property>
    </bean>

   <bean id="/hello.do" class="cn.happy.controller.MyController"></bean>

  外部配置文件

<?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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:tx="http://www.springframework.org/schema/tx"
     xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 外部资源 -->
    <bean id="jd" class="org.springframework.web.servlet.view.RedirectView">
     <property name="url" value="http://www.jd.com"></property>
    </bean>

    <!-- 内部资源 -->
     <bean id="internal" class="org.springframework.web.servlet.view.JstlView">
     <property name="url" value="/WEB-INFO/jsp/happy.jsp"></property>
    </bean>

</beans>

02.处理 配置为"/"解决的三种方法

<!-- 配置中央调度器 -->
   <servlet>
     <servlet-name>springmvc</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <!--指定配置文件applicationContext的路径  -->
    <init-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>classpath:applicationContext.xml</param-value>
    </init-param>

    <!--Tomcat启动的时候，Servlet对象已经到内存！！！！ >0数字    0或者是负数，和你没有设置是一样的  -->
     <load-on-startup>1</load-on-startup>
   </servlet>

   <!-- 代替带调度器 -->
   <servlet-mapping>
     <servlet-name>springmvc</servlet-name>
     <url-pattern>/</url-pattern>
  </servlet-mapping>

01.web.xml配置文件中书写

<!--处理 配置为"/"解决的第一种 -->
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.JPG</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.png</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.css</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>

ApplicationContext.xml文件中

        <!-- 第二种 -->
       <!--<mvc:default-servlet-handler/>-->

      <!-- 第三种 -->
      <!--<mvc:resources location="/images/" mapping="/images/**"></mvc:resources>-->
    

 03.继承AbstractController

      跟模版方法很相似,在handleRequest的方法基础上新添加自己的handleRequestInternal方法

public class MyAbstract extends AbstractController{

@Override
protected ModelAndView handleRequestInternal(
HttpServletRequest httpservletrequest,
HttpServletResponse httpservletresponse) throws Exception {
ModelAndView mv=new ModelAndView();
mv.addObject("msg", "明天放假一天，不上课");
//处理一道
mv.setViewName("WEB-INF/jsp/happy.jsp");
return mv;
}

}

并且可以控制请求的方式、例如post或者get等

<bean id="/hello.do" class="cn.happy.controller.MyAbstract">
      <property name="supportedMethods" value="POST,GET,"></property>
    </bean>

     04.继承MultiActionController(可以创建多个方法)

public class MyMutilAction extends MultiActionController{

    public ModelAndView doFirst(HttpServletRequest request,
            HttpServletResponse response) throws Exception {

        ModelAndView mv=new ModelAndView();
        mv.addObject("msg", "我是doFrist");//reqeuset.setAttribute("key","value");
        mv.setViewName("WEB-INF/jsp/happy.jsp");
        return mv;
    }

    public ModelAndView doSecond(HttpServletRequest request,
            HttpServletResponse response) throws Exception {

        ModelAndView mv=new ModelAndView();
        mv.addObject("msg", "我是doSecond");
        mv.setViewName("WEB-INF/jsp/happy.jsp");
        return mv;
    }
}

可以自定义出外界访问的*.do

<!--  适配器 -->
     <!--<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
            <property name="mappings">
               <props>
                 <prop key="/hello.do">firstController</prop>
               </props>
            </property>
         </bean>-->

     <!-- 配置处理器 -->
     <!--<bean id="firstController" class="cn.happy.controller.MyMutilAction">
          <property name="methodNameResolver" ref="nameResolver"></property>
     </bean>-->

     <!--<bean id="nameResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
      <property name="paramName" value="actionName"></property>
     </bean>-->