首页 > 代码库 > SpringMVC

SpringMVC

Spring Web MVC需要使用SpringIOC功能

用于开发MVC结构的web程序。

1.MVC思想

将程序组件分为模型,视图,控制器三部分

 技术分享

注意:

    dispatcherServlet:接受指定的请求,类似一个大的主控制器(大boss)

    HanlerMapping:根据不同请求类型找寻Controller

    ViewResolver:寻找视图,生成详细信息

 

 

2.SpringMVC编写程序的具体流程

/hello.do
--->DispatcherServlet(配置)
--->HandlerMapping(配置)
--->HelloController(编写+配置)
--->ViewResolver(配置)
--->/WEB-INF/hello.jsp(编写)

 

3.Spring Web MVC简单程序实现

实例:一个SpringMVC的helloword案例

(1)搭建Spring Web MVC开发环境,引入IOC,webmvc开发包,在src下添加applicationContext.xml

(2)编写HelloController实现

package com.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

public class HelloController implements Controller{

    public ModelAndView handleRequest(HttpServletRequest request, 
                                      HttpServletResponse response) throws Exception {
            ModelAndView mav=new ModelAndView();
            mav.setViewName("hello");//设置视图名字
            mav.getModel().put("msg", "模型数据");//等价于request.setAttribute("msg","模型数据");
            
        return mav;
    }
    

}

(3)在web.xml配置DispatcherServlet(配置)

<!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>exam</servlet-name>
          <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
          <init-param>
              <param-name>contextConfigLocation</param-name>
              <param-value>classpath:applicationContext.xml</param-value>
          </init-param>
          <!-- 启动服务器的时候,优先级是1 -->
          <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>exam</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

(4)在applicationContext.xml中配置相关组件

A.定义Handlermapping(配置)

<!-- 配置handlermapping --> 
   <bean id="handlermapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
           <!-- 指定请求和controller对应关系 -->
           <property name="mappings">
               <props>
                   <prop key="/hello.do">helloController</prop>
                   <prop key="/login.do">loginController</prop>
               </props>
           </property>
   </bean>
   

B.Controller配置、

<!-- 配置Controller -->
   <bean id="helloController" class="com.controller.HelloController">
   </bean>
   <bean id="loginController" class="com.controller.LoginController"></bean>

C.配置ViewResolver

<!-- 配置ViewResolver -->
   <bean id="viewresolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
           <property name="prefix" value="/WEB-INF/"></property>
           <property name="suffix" value=".jsp"></property>
   </bean>

 

SpringMVC