SpringMVC 入门项目，非注解

非注解基础项目

1.创建一个maven项目 目录结构是这样的

2.需要加入的jar

<dependencies>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-webmvc</artifactId>      <version>4.3.6.RELEASE</version>    </dependency>    <dependency>      <groupId>jstl</groupId>      <artifactId>jstl</artifactId>      <version>1.2</version>    </dependency>    <dependency>      <groupId>javax.servlet</groupId>      <artifactId>javax.servlet-api</artifactId>      <version>3.1.0</version>    </dependency>  </dependencies>

3.web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">  <listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <context-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath:spring.xml</param-value>  </context-param>  <!-- POST中文乱码过滤器 -->  <filter>    <filter-name>CharacterEncodingFilter</filter-name>    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>    <init-param>      <param-name>encoding</param-name>      <param-value>utf-8</param-value>    </init-param>  </filter>  <filter-mapping>    <filter-name>CharacterEncodingFilter</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping>  <servlet>    <servlet-name>SpringMVC</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：表示启动容器时初始化该Servlet；-->    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>SpringMVC</servlet-name>    <!--url-pattern：表示哪些请求交给Spring Web MVC处理， “/” 是用来定义默认    servlet映射的。也可以如“*.html”表示拦截所有以html为扩展名的请求。-->    <url-pattern>/</url-pattern>  </servlet-mapping></web-app>

4.spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">    <!-- HandlerMapping 映射处理器-->    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>    <!-- HandlerAdapter:处理类中的核心方法的 -->    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>    <!-- ViewResolver :视图解析器-->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>        <property name="prefix" value="/WEB-INF/jsp/"/>        <property name="suffix" value=".jsp"/>    </bean>    <!--映射的controller类-->    <bean name="/base" class="com.lyf.controller.BaseController"/></beans>

4.spring.xml文件

<?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:p="http://www.springframework.org/schema/p"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xsi:schemaLocation="     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd        http://www.springframework.org/schema/mvc        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">    <mvc:default-servlet-handler/><!-- 只针对静态页，jsp可不用  --></beans>

servlet在找页面时，走的是dispatcherServlet路线。找不到的时候会报404
加上这个默认的servlet时候，servlet在找不到的时候会去找静态的内容。
5.BaseController

package com.lyf.controller;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Created by fangjiejie on 2017/6/1. */public class BaseController implements Controller {    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {        ModelAndView modelAndView=new ModelAndView();        System.out.println("找到BaseController");        //添加模型数据 可以是任意的POJO对象        modelAndView.addObject("A","大家好");        //设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面        modelAndView.setViewName("show");        //httpServletRequest        return modelAndView;    }}

6.index.html

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title></head><body><a href="base"><h3>第一个Springmvc</h3></a></body></html>

7.show.jsp

<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><html><body><h2>Hello World!</h2>${A}<%--表示显示由处理器传过来的模型数据。--%></body></html>