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SpringMVC_RequestMapping注解之属性.md

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SpringMVC_RequestMapping注解之属性

一、RequestMapping注解的属性解析

  • 1、拥有属性：（value、method、params、headers）

    • 1>value(默认即为value)//请求路径

      eg:

      @RequestMapping("/hello")
@RequestMapping(value = "/hello")

//请求方式：http://localhost:8080/springmvc_demo/hello

    • 2>method//请求方式

      • RequestMethod.GET

      • RequestMethod.POST

      • RequestMethod.DELETE

      • RequestMethod.HEAD

      • RequestMethod.OPTIONS

      • RequestMethod.PATCH

      • RequestMethod.PUT

      • RequestMethod.TRACE

      eg:

      @RequestMapping(value = "/hello")
@RequestMapping(value = "/hello",method = RequestMethod.GET)
@RequestMapping(value = "/hello",method = RequestMethod.POST)

//请求方式：http://localhost:8080/springmvc_demo/hello

    • 3>params//请求须带的参数

      eg:

      params = {"name","age=2"})//请求后跟name和age参数，且age=2(name的值随意，age必须为2)
@RequestMapping(value = "/hello",method = RequestMethod.GET,params = {"name","age=2"})

//请求方式：http://localhost:8080/springmvc_demo/hello?name=asd&age=2

    • 4>headers

      eg:

        //可以访问，因为浏览器会自己传Connection=keep-alive请求头
  @RequestMapping(value = "/hello",method = RequestMethod.GET,
       params = {"name","age=2"},headers = "Connection=keep-alive")
  
  //不可以访问，因为浏览器没有Connection=keep-alive2请求头，需要直接封装请求头
  @RequestMapping(value = "/hello",method = RequestMethod.GET,
       params = {"name","age=2"},headers = "Connection=keep-alive2")
  
  
  //请求方式：http://localhost:8080/springmvc_demo/hello?name=asd&age=2

  • 2、方法限制(method)

    eg：

    @RequestMapping(value="/hello",method=RequestMethod.GET) --请求地址是/hello，而且必须是get请求

@RequestMapping(value="/hello",method=RequestMethod.POST) --请求地址是/hello，而且必须是post请求

  • 3、参数限制|请求头限制(了解)：

    eg:

    @RequestMapping(value = "/hello",params = {"name=1","age"},headers ="Connection=keep-alive" )

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;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller//控制层
public class HelloController {

    /**
     * 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
     */
    //请求后跟name和age参数，且age=2
    @RequestMapping(value = "/hello",method = RequestMethod.GET,params = {"name","age=2"},
            headers = "Connection=keep-alive")
    public String run(){
        System.out.println("hello SpringMVC!");
        return "success";
    }
}

  • 在/WEB-INF/views下新建success.jsp