SpringMVC_第一个程序

一、基本代码的完成

补充

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1、在myeclipse中 WEB-INF下放的资源和WebRoot下的资源区别：

WEB-INF下放到资源是不能通过浏览器直接访问的，是比较安全的，只能是后台服务端程序进行跳转的时候跳转过去，所以不能重定向到WEB-INF.

2、在使用EL表达式的jsp页面

<%@page isELIgnored="false" %>

3、SpringMVC最全约束

<?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:tx="http://www.springframework.org/schema/tx"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        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">
</beans>

public class MyController implements Controller {
 
    public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        // TODO Auto-generated method stub
        ModelAndView mv= new ModelAndView();
        mv.addObject("message","hello SpringMVC World!");
        mv.setViewName("/WEB-INF/welcome.jsp");
        return mv;
    }
 
}

MyController

注册处理器

 <?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:tx="http://www.springframework.org/schema/tx"
         xmlns:mvc="http://www.springframework.org/schema/mvc"
         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">
 
 <!-- 注册处理器 -->
 <bean id="/my.do" class="com.jmu.handlers.MyController"></bean>
 </beans>

springmvc.xml

二、注册中央调度器

在web.xml中

<!--  注册中央调度器 -->
 <servlet>
   <servlet-name>reyco</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 </servlet>
<servlet-mapping>
  <servlet-name>reyco</servlet-name>
  <url-pattern>*.do</url-pattern>
</servlet-mapping>

三、指定SpringMVC配置文件

添加修改

 <servlet>
   <servlet-name>reyco</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     
     <init-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>classpath:springMVC.xml</param-value>
   </init-param>
 </servlet>

四、springMVC执行流程

五、使用servletloadOnStartup

目的：在Tomcat启动时直接创建当前Servlet

在web.xml中添加

 <load-on-startup>1</load-on-startup>

即添加修改

!--  注册中央调度器 -->
 <servlet>
   <servlet-name>springMVC</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <!-- 指定springMVC配置文件的位置及文件名 -->
   <init-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>classpath:springMVC.xml</param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
 </servlet>
<servlet-mapping>
  <servlet-name>springMVC</servlet-name>
  <url-pattern>*.do</url-pattern>
</servlet-mapping>

五、使用视图解析器

修改MyController

    mv.setViewName("welcome");//welcome为逻辑视图

welcome逻辑视图名通过内部资源适配器InternalResourceViewResolver转换成物理视图

修改springmvc.xml

<!-- 注册视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
 <property name="prefix" value="/WEB-INF/jsp/"></property>
  <property name="suffix" value=".jsp"></property>
</bean>

六、整理

 public class MyController implements Controller {
 
     public ModelAndView handleRequest(HttpServletRequest request,
             HttpServletResponse response) throws Exception {
         // TODO Auto-generated method stub
         ModelAndView mv= new ModelAndView();
         mv.addObject("message","hello SpringMVC World!");
         mv.setViewName("welcome");//welcome为逻辑视图
         return mv;
     }
 
 }

MyController

 <?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:tx="http://www.springframework.org/schema/tx"
         xmlns:mvc="http://www.springframework.org/schema/mvc"
         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">
 <!-- 注册视图解析器 -->
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="prefix" value="/WEB-INF/jsp/"></property>
   <property name="suffix" value=".jsp"></property>
 </bean>
 <!-- 注册处理器 -->
 <bean id="/my.do" class="com.jmu.handlers.MyController"></bean>
 </beans>

springmvc.xml

 <?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"
     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>01-springmvc-primary</display-name>
 
     <!-- 注册中央调度器 -->
     <servlet>
         <servlet-name>springMVC</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <!-- 指定springMVC配置文件的位置及文件名 -->
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath:springmvc.xml</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
     </servlet>
     <servlet-mapping>
         <servlet-name>springMVC</servlet-name>
         <url-pattern>*.do</url-pattern>
     </servlet-mapping>
 
     <welcome-file-list>
         <welcome-file>index.jsp</welcome-file>
     </welcome-file-list>
 
 </web-app>

web.xml

七、DispatcherServlet默认配置