springmvc執行原理
阿新 • • 發佈:2020-11-23
1.確定 maven lib 匯入正確
2.配置web.xml , 註冊DispatcherServlet
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <!--1.註冊DispatcherServlet--> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!--關聯一個springmvc的配置檔案:【servlet-name】-servlet.xml--> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> <!--啟動級別-1 和伺服器一起啟動--> <load-on-startup>1</load-on-startup> </servlet> <!--/ 匹配所有的請求;(不包括.jsp)--> <!--/* 匹配所有的請求;(包括.jsp)--> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app> ```java ##3.編寫SpringMVC 的 配置檔案!名稱:springmvc-servlet.xml : [servletname]-servlet.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> </beans>
4.、新增
處理對映器 檢視解析器 <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/> 處理器介面卡 <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/> <!--檢視解析器:DispatcherServlet給他的ModelAndView--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver"> <!--字首--> <property name="prefix" value="/WEB-INF/jsp/"/> <!--字尾--> <property name="suffix" value=".jsp"/> </bean>
實現Controller介面 註釋也能實現
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { //ModelAndView 模型和檢視 ModelAndView mv = new ModelAndView(); //封裝物件,放在ModelAndView中。Model mv.addObject("msg","HelloSpringMVC!"); //封裝要跳轉的檢視,放在ModelAndView中 mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp return mv; }
將自己的類交給SpringIOC容器,註冊bean
<!--Handler-->
<bean id="/hello" class="com.kuang.controller.HelloController"/>
寫要跳轉的jsp頁面,顯示ModelandView存放的資料,以及我們的正常頁面;
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Kuangshen</title>
</head>
<body>
${msg}
</body>