springmvc（3）——使用注解實作springmvc，@Controller、@RequestMapping

1.springmvc的配置檔案中添加注解支援

<?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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--自動掃描包，讓指定包下的注解生效，由ICO容器統一管理-->
    <context:component-scan base-package="com.lixv.controller"/>
    <!--讓SpringMVC不處理靜态資源-->
    <mvc:default-servlet-handler/>
    <!--注解支援-->
    <mvc:annotation-driven/>
    
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

           

2.通過注解寫controller

package com.lixv.controller;

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

@Controller
@RequestMapping("/aaa")
public class HelloController01 {
    @RequestMapping("/a1")
    public String a1(Model model){
        model.addAttribute("msg","hello,SpringMVCAnnotation");
        return "test";
    }
}

           

1. @Controller将此類作為controller傳入springmvc中管理
2. @RequestMapping注解的值為請求路徑，如圖a1方法對應的請求路徑為/aaa/a1

3. model.addAttribute

   相當于

   request.setAttribute

4. return的字元串内容傳入InternalResourceViewResolver的bean中進行加工，變成傳回的頁面的路徑