SpringMVC02--利用注解实现

1、同样导入相关的jar包
2、配置web.xml文件

<?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_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <display-name>springmvc_annotation</display-name>
    <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:mvc.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>
</web-app>

3、配置spring MVC文件
因为要使用注解的方式,所以不用配置HandlerMapping和HandlerAdapter以及接受请求的相关处理器。
只需配置需要渲染的视图以及需要主动扫描的包

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    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">
    <!-- 配置HandlerMapping -->
    <!-- <bean
        class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" /> -->
    <!-- 配置HandlerAdapter -->
    <!-- <bean
        class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" /> -->
    <!-- 配置渲染器 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <!-- 返回的结果是的前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/" />
        <!-- 返回的结果视图的后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>
    <!-- 自动扫描和配置请求处理器 -->
    <context:component-scan base-package="winney.controller"></context:component-scan>
</beans>

4、编写请求处理器

package winney.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloController {
    @RequestMapping("/hello")
    public ModelAndView hello(HttpServletRequest request, HttpServletResponse response) {
        ModelAndView mv = new ModelAndView();
        // 封装数据到要显示的视图中
        mv.addObject("msg", "Hello ,Winney.I am spring MVC anotation");
        // 设置视图的名称 经过xml的配置 它会自动找到/WEB-INF/jsp/hello.jsp页面
        mv.setViewName("hello");
        return mv;
    }

}

5、编写jsp文件
jsp文件要按照spring mvc的配置文件的配置渲染视图那里的配置来放置文件。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
${msg }
</body>
</html>
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