springMVC配置文件方式

一、web.xml

• 配置tomcat启动时加载DispatcherServlet
• 配置spring配置文件的路径和名称

<web-app version="4.0"

      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_4_0.xsd">

      <servlet>

            <servlet-name>springmvc</servlet-name>

            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

            <!-- 修改配置文件路径和名称 -->

            <init-param>

                  <param-name>contextConfigLocation</param-name>

                  <param-value>classpath:springmvc.xml</param-value>

            </init-param>

            <!-- 自启动，tomcat启动时加载，否则第一次访问时加载 -->

            <load-on-startup>1</load-on-startup>

      </servlet>

      <servlet-mapping>

            <servlet-name>springmvc</servlet-name>

            <url-pattern>/</url-pattern>

      </servlet-mapping>

  <display-name>Archetype Created Web Application</display-name>

</web-app>

 

二、springmvc.xml

• 配置HandlerMapping

<?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:aop="http://www.springframework.org/schema/aop"

      xmlns:context="http://www.springframework.org/schema/context"

      xsi:schemaLocation="http://www.springframework.org/schema/beans

        https://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/aop

        https://www.springframework.org/schema/aop/spring-aop.xsd

        http://www.springframework.org/schema/context

         https://www.springframework.org/schema/context/spring-context.xsd">

        

    <bean id="demo123" class="top.woldcn.controller.Controller"></bean>

    <bean  class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

       <property name="urlMap">

             <map>

                   <!-- 解析出来的控制器 -->

                   <entry key="demo" value-ref="demo123"></entry>

             </map>

       </property>

    </bean>

       

</beans>

 

三、controller.java

package top.woldcn.controller;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;

public class Controller implements  org.springframework.web.servlet.mvc.Controller{

      @Override

      public ModelAndView handleRequest(HttpServletRequest request,  HttpServletResponse response) throws Exception {

            PrintWriter out=response.getWriter();

            out.write("hello");

            out.flush();

            out.close();

            return null;

      }

}