SpringMVC用注解写第一个程序HelloSpringMVC

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比起刚刚用xml配置开发的第一个程序HelloSpringMVC简单多了,当然在实际开发中也是用注解开发的,这里还是先给出一个HelloController,但是这里不用实现Controller接口了,而是用注解搞定

package com.zhiying.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {

    @RequestMapping("/hh")
    public String Hello(Model model) {

        model.addAttribute("msg", "Hello SpringMVC");

        //被试图解析器处理,拼接成/WEB-INF/jsp/hello.jsp
        return "hello";
    }
}

接下来是要跳转的jsp页面了


<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${msg}
</body>
</html>

紧接着是一些简单的Spring配置,看到之后,你会觉得超级爽,而且都是固定的

<?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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--        自动扫描包,让指定包下的注解生效,由IoC容器统一管理-->
    <context:component-scan base-package="com.zhiying.controller"/>
    <mvc:annotation-driven/>

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

</beans>

最后就是我们的web.xml了,也是固定的

<?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">
    <!--    注册DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--        关联一个springmvc的配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--        启动级别-->
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!--    / 匹配所有的请求,不包括.jsp-->
    <!--   /* 匹配所有的请求,包括.jsp -->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

好了,简简单单这几部,我们能看到,我们的HelloController类的东西越来越简单了