springMVC-02-注解开发

注解开发

相对于快速开发,只是改变了springmvc-cnfig.xml配置

<?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 http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tool http://www.springframework.org/schema/tool/spring-tool.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--注解扫描-->
    <context:component-scan base-package="com.huangxin.order.controller"/>
    <!--注解驱动-->
    <!--可以自动加载映射器和适配器-->
    <mvc:annotation-driven/>
    <!--视图解析器-->
    <!--可以解析jsp-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--自动解析-->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

最后只剩下这三个核心配置

controller.java也改变了

package com.huangxin.order.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller//表示是一个后端控制器
public class HelloAnnotationController {
    @RequestMapping("/a")
    public String hello(Model model) {
        model.addAttribute("hello", "Hello SpringMVC");
        return "helloAnnotation";
    }
}

注意

1) @RequestMapping("/a")表示访问的地址,也就是http://localhost:8080/a来访问这个地址
2) @Controller让其注册为Bean
3) 返回资源地址也就是/WEB-INF/jsp/helloAnnotation.jsp文件