写一个简单的SpringMvc的demo
1.引入springmvc相关的架包
2.在web.xml中配置DispatcherServlet
1 <servlet> 2 <servlet-name>springMVC</servlet-name> 3 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 4 <init-param> 5 <param-name>contextConfigLocation</param-name> 6 <param-value>classpath:springMVC-annotation.xml</param-value> 7 </init-param> 8 </servlet> 9 10 <servlet-mapping> 11 <servlet-name>springMVC</servlet-name> 12 <url-pattern>*.do</url-pattern> 13 </servlet-mapping>
3.配置springMvc的配置文件
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd"> 6 7 8 <!-- 配置一个handMappering 如果不配置系统会默认有一个HandleMapping --> 9 10 <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean> 11 <!-- 注册自己用的controller类 --> 12 <bean name="/my.do" class="com.zhiyou100.mcl.controller.MyController"></bean>
13 <!-- 配置视图解析器 --> 14 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 15 <property name="prefix" value="/WEB-INF/view/"/> 16 <property name="suffix" value=".jsp"/> 17 </bean> 18 </beans>
4.常见的HandlerMapping
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd"> 6 7 8 <!-- 配置一个handMappering 如果不配置系统会默认有一个HandleMapping --> 9 <!-- 1.根据bean名查找 --> 10 <!-- <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean> --> 11 <!-- 注册自己用的controller类 --> 12 <!-- <bean name="/my.do" class="com.zhiyou100.mcl.controller.MyController"></bean> --> 13 <!-- 2.根据id查找相对应的controller类 14 这里包含了id与url地址的映射关系 15 --> 16 <!-- <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> 17 <property name="mappings"> 18 <props> 19 <prop key="/a.do">my1</prop> 20 <prop key="/b.do">my2</prop> 21 </props> 22 </property> 23 </bean> 24 注册自己用的controller类 25 <bean id="my1" class="com.zhiyou100.mcl.controller.MyController"></bean> 26 <bean id="my2" class="com.zhiyou100.mcl.controller.MyController2"></bean> --> 27 28 <!-- 3.根据controller类的名字查找对应的Contorller类 29 类中除了Controller首字母大写，其他都小写 --> 30 <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"></bean> 31 <bean class="com.zhiyou100.mcl.controller.MyController"></bean> 32 <bean class="com.zhiyou100.mcl.controller.SecondController"></bean> 33 <!-- 配置视图解析器 --> 34 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 35 <property name="prefix" value="/WEB-INF/view/"/> 36 <property name="suffix" value=".jsp"/> 37 </bean> 38 </beans>
4.1 BeanNameUrlHandlerMapping 根据bean标签的名称找到对应的Controller类
4.2 SimpleUrlHandlerMapping 根据bean的id查找对应的Controller类。
4.3 ControllerClassNameHandlerMapping 根据controller类的名字找到对应的Controller。
5. 使用注解来替代配置信息。(比较常用)
5.1 加入额外的架包
5.2 在springmvc配置文件中加入如下代码。
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:mvc="http://www.springframework.org/schema/mvc" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context.xsd 10 http://www.springframework.org/schema/mvc 11 http://www.springframework.org/schema/mvc/spring-mvc.xsd 12 "> 13 14 <!-- 包扫描：扫描注解所在的包controller类所在的包 --> 15 <context:component-scan base-package="com.zhiyou100.mcl.controller.annotation"></context:component-scan> 16 <!-- 开启注解驱动AnnotationHandlerMapping --> 17 <mvc:annotation-driven/> 18 19 <!-- 配置视图解析器 --> 20 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 21 <property name="prefix" value="/WEB-INF/view/"/> 22 <property name="suffix" value=".jsp"/> 23 </bean> 24 25 </beans>
5.2 创建Controller类
1 package com.zhiyou100.mcl.controller.annotation; 2 3 import org.springframework.stereotype.Controller; 4 import org.springframework.web.bind.annotation.RequestMapping; 5 6 @Controller 7 public class MyController1 { 8 @RequestMapping("/list.do") //表示的是网页地址栏上的访问地址 9 public String list() { 10 System.out.println("查询所有"); 11 return "login"; 12 } 13 14 @RequestMapping("/delete.do") 15 public String delete() { 16 System.out.println("删除"); 17 return "login"; 18 } 19 20 @RequestMapping("/save.do") 21 public String save() { 22 System.out.println("保存"); 23 return "login"; 24 } 25 }
每一个请求对应着Controller中的一个方法
