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SpringMVC_RequestMapping注解之注解位置.md

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SpringMVC_RequestMapping注解之注解位置

一、注解位置解析

  • 1、类上

  • 2、方法上

  • 请求的地址将会是 /项目名/类上注解/方法上注解

    eg:

    http://localhost:8080/springmvc_demo/student/list

二、项目实战

  • 需要jar包：

    • core、beans、context、expression、aop、web、web-mvc

    • commons-logging

  • 首先要在web.xml编写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_3_1.xsd"
         version="3.1">
    <!-- 配置DispatcherServlet -->
    <!--The front controller of this Spring Web application, -->
                   <!--responsible for handling all application requests-->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Map all requests to the DispatcherServlet for handling -->
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

  • 随后在resource目录下创建springmvc.xml 在xml配置包扫描和视图解析器

    <?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/mvc 
         http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
         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-4.3.xsd">

    <!-- 配置扫描包 -->
    <context:component-scan base-package="com.edu.controller"></context:component-scan>
    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

  • 新建java文件，弄成控制层：(WEB-INF是安全目录，不能直接访问，用转发的方式进去。)

    package com.edu.controller;

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

@Controller//控制层
@RequestMapping("/student")//默认是value属性
public class StudentController {
    /**
     * 1. 使用@RequestMapping注解映射请求的url
     * 2. 返回值会通过视图解析器解析为实际的物理视图
     * prefix+ return值 + suffix 得到实际的物理视图，然后转发
     * @return
     */
    @RequestMapping("/list")//默认是value属性
    public String list(){
        return "student_list";
    }
}

  • 在/WEB-INF/views下新建student_list.jsp