springmvc笔记01

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commons-logging-1.1.3.jarjstl.jarspring-aop-3.2.0.RELEASE.jarspring-aspects-3.2.0.RELEASE.jarspring-beans-3.2.0.RELEASE.jarspring-context-3.2.0.RELEASE.jarspring-context-support-3.2.0.RELEASE.jarspring-core-3.2.0.RELEASE.jarspring-expression-3.2.0.RELEASE.jarspring-jdbc-3.2.0.RELEASE.jarspring-orm-3.2.0.RELEASE.jarspring-test-3.2.0.RELEASE.jarspring-web-3.2.0.RELEASE.jarspring-webmvc-3.2.0.RELEASE.jarstandard.jar

 <!-- springMVC前端控制器 -->  <servlet>     <servlet-name>springmvc</servlet-name>     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>     <!-- contextConfigLocation配置springmvc加载的配置文件（处理器映射，适配器） -->     <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>   </servlet-mapping>

<!-- 处理器映射器 -->    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>    <!-- 处理器适配器 -->     <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>    <!-- 视图解析器 -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/>

4.springmvc.xml

<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:p="http://www.springframework.org/schema/p"       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/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            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">

5.非注解的映射器

org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping

另一个映射器

org.springframework.web.servlet.handler.SimpleUrlHandlerMapping

<!-- 简单的URL映射 -->    <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">       <property name="mappings">          <props>             <prop key="/items1.action">itemsController</prop>             <prop key="/items2.action">itemsController</prop>          </props>       </property>    </bean>

1.多个映射器可以并存。

6.非注解的适配器和映射器

org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter

1.要求编写handler实现controller接口

@Overridepublic ModelAndView handleRequest(HttpServletRequest request,HttpServletResponse response) throws Exception {// TODO Auto-generated method stub//调用service查找数据库，查询商品列表，这里使用静态数据模拟List<Items> items=new ArrayList<>();Items i1=new Items();i1.setName("香蕉");i1.setPrice(12.6f);i1.setDatail("好吃营养");i1.setCreatetime(new Date());Items i2=new Items();i2.setName("苹果");i2.setPrice(1.6f);i2.setDatail("好吃营养");i2.setCreatetime(new Date());items.add(i1);items.add(i2);//返回ModelAndViewModelAndView andView=new ModelAndView();andView.addObject("itemsList", items);//指定视图andView.setViewName("/WEB-INF/jsp/items/itemsList.jsp");return andView;}

另一个适配器

org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter

1.要求编写handler实现httpRequestHandler接口

@Overridepublic void handleRequest(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// TODO Auto-generated method stub//调用service查找数据库，查询商品列表，这里使用静态数据模拟List<Items> items=new ArrayList<>();Items i1=new Items();i1.setName("香蕉");i1.setPrice(12.6f);i1.setDatail("好吃营养");i1.setCreatetime(new Date());Items i2=new Items();i2.setName("苹果");i2.setPrice(1.6f);i2.setDatail("好吃营养");i2.setCreatetime(new Date());items.add(i1);items.add(i2);//设置模型数据request.setAttribute("itemsList", items);//设置转发视图request.getRequestDispatcher("/WEB-INF/jsp/items/itemsList.jsp").forward(request, response);//此方法可以通过修改response,设置响应数据格式，比如：josn}

7.注解适配器和映射器

1.在spring3.1前使用 org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping 注解映射器

2.在spring3.1后使用 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping 注解映射器

3.在spring3.1前使用 org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter注解适配器

4.在spring3.1后使用 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter注解适配器

<!-- 代替注解适配器和映射器配置，           默认加载很多绑定方法：json转换解析器 。        实际开发使用。     -->    <mvc:annotation-driven></mvc:annotation-driven>

6.注解开发handler

/** * @描述:注解 实现controller接口的处理器 * @version 创建时间: 2016-10-31:下午5:37:58 * @E-mail 邮箱: ***@126.com * @author 作者:  *** */@Controllerpublic class ItemsController3{/** *  * @version 创建时间: 2016-11-1:下午3:22:38 * @author 作者: *** * @描述:将url与方法写成一样。 * @requestmapping实现对方法和url进行映射（注解映射器），一个方法一个url. */@RequestMapping("/queryItems")public ModelAndView queryItems()throws Exception{List<Items> items=new ArrayList<>();Items i1=new Items();i1.setName("香蕉");i1.setPrice(12.6f);i1.setDatail("好吃营养");i1.setCreatetime(new Date());Items i2=new Items();i2.setName("苹果");i2.setPrice(1.6f);i2.setDatail("好吃营养");i2.setCreatetime(new Date());items.add(i1);items.add(i2);//返回ModelAndViewModelAndView andView=new ModelAndView();andView.addObject("itemsList", items);//指定视图andView.setViewName("/WEB-INF/jsp/items/itemsList.jsp");return andView;}}

7.配置handler

 <!-- 对于注解的handler可以单个配置       实际开发中使用组件扫描：    -->    <bean class="cn.lanz.ssm.controller.ItemsController3"/>    <context:component-scan base-package="扫描包">          </context:component-scan>

8.源码分析：

通过前端控制器源码分析springMVC的执行过程

1.前端控制器接收请求。

调用doDispatch

protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {HttpServletRequest processedRequest = request;HandlerExecutionChain mappedHandler = null;boolean multipartRequestParsed = false;

2.前端控制器去调用映射器查找handler.

返回执行器的链接

protected HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {

for (HandlerMapping hm : this.handlerMappings) {if (logger.isTraceEnabled()) {logger.trace("Testing handler map [" + hm + "] in DispatcherServlet with name '" + getServletName() + "'");}HandlerExecutionChain handler = hm.getHandler(request);if (handler != null) {return handler;}}return null;}

3.调用适配器执行handler得到执行结果modelandview

// Actually invoke the handler.mv = ha.handle(processedRequest, response, mappedHandler.getHandler());

4.视图渲染

视图解析

// We need to resolve the view name.

view = resolveViewName(mv.getViewName(), mv.getModelInternal(), locale, request);

9.视图解析器前缀、后缀。

//指定视图andView.setViewName("/WEB-INF/jsp/items/itemsList.jsp");//在视图里已经配置好前缀和后缀//andView.setViewName("items/itemsList");

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

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