springmvc入门

1配置坐标

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>

2配置springmvc前端控制器

    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup><!--启动时就开始加载 默认为第一次访问时在加载-->
    </servlet>

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

3编写controller层代码和映射试图界面 并配置好

package com.jc.controller;

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

@Controller
public class UserController {
    @RequestMapping("/quick")//映射地址
    public String save(){
        System.out.println("control is runing");
        return "success.jsp";
    }
}

4组件扫描

<?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"

       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">
<!--    mvc组件扫描-->
    <context:component-scan base-package="com.jc.controller">

    </context:component-scan>
</beans>

@RequestMapping(value = "/user",method = RequestMethod.POST,params = {"username"})//映射地址 这里加一行 访问时地址为路径/user/quick

params代表必须要有的参数 可以是表达式 类型为数组