springmvc 初学笔记（一）

简单工程布局如下

1.配置前端控制器
在web.xml中配置DispatcherServlet（前端控制器）本质上是一个servlet
所以配置与servlet有相似之处

<servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 配置默认加载路径 为classpath:springmvc.xml  -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.action</url-pattern><!-- 匹配以.action为结尾的路径-->
    </servlet-mapping>

2.在springmvc.xml中配置

配置handler※
1.name=”/queryItems.action” 访问时在地址栏写的地址为”/queryItems.action”
以.action结尾，上文前端控制器中servlet mapping中匹配相同
2.class=”test.ssm.controller.ItemsController” 写的controller全路径 –>

<?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"
    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">

<!--配置handler-->
    <bean name="/queryItems.action" class="test.ssm.controller.ItemsController"></bean>

<!-- 处理器映射器 将bean的name作为url进行查找 需要在配置handler时指定beanname（url） -->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping.class"></bean>


<!-- 处理器适配器
     所有的适配器处理器都实现 HandlerAdapter -->
     <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>

    <!-- 处理器解析器 
     配置解析jsp的解析器
    写的是jsp页面 所以配置的是jsp页面显示 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/></beans>

controller的Java文件代码如下
返回的是一个ModelAndView值

package test.ssm.controller;
public class ItemsController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {

        List<String> li=new ArrayList<String>();
        li.add("百度");
        li.add("搜狐");
        li.add("新浪");

        ModelAndView MAV=new ModelAndView();
        MAV.addObject("info",li);//类似于servlet中的setAttrivute方法
        MAV.setViewName("/show.jsp");//作用到哪个jsp页面

        return MAV;
    }
}

注解方式实现简洁明了

注解方式工程结构

web.xml文件如下

<servlet>
        <servlet-name>springmvc2</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置默认加载文件 
        contextConfigLocation 配置springmvc加载的配置文件 -->
        <!--不配置 则默认加载的是/WEB-INF/servlet名称-servlet.xml（springmvc-servlet-class）  -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc2.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc2</servlet-name>
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>

springmvc2.xml如下

<?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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
    <!--自动配置映射器和注解器 实际中使用 方便操作-->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!--指定扫描的包-->
    <context:component-scan base-package="test.ssm.controller2"></context:component-scan>

<!--自动配置jsp视图控制器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" />
</beans>

springmvc 初学笔记（一）

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