springMVC基础工程搭建

1、配置springMVC，构建简单springMVC程序，需要先导入以下包，首先，需要导入springContext，springMVC也是基于spring。然后导入spring-webmvc，这是springMVC的核心依赖包，然后需要导入Servlet-api,这是因为springMVC需要配置一个dispathServlet，需要引入servlet依赖，需要使用前端资源，导入jsp依赖。

    <!-- spring   -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.9.RELEASE</version>
    </dependency>
    <!--    springMvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
    <!-- servlet configuration-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <!--jsp-->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
    </dependency>

2、web.xml的配置，主要是配置dispatcherServlet，dispatcherServlet本质上是一个Servlet，需先配置Servlet，再配置Servlet-mapping。在Servlet配置中需配置springmvc.xml的位置。Servlet-mapping中需配置要拦截什么资源。

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
         xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
         http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <!--配置解决中问乱码问题的过滤器-->
  <filter>
    <filter-name>encodingFilter</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>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--配置springMVC前端控制器 dispatcherServlet-->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--加载配置文件-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <!--    加载时机,启动时立即加载-->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <!--映射 dispatcherServlet-->
  <servlet-mapping>
    <!---->
    <servlet-name>dispatcherServlet</servlet-name>
    <!--拦截所有资源，不包括jsp-->
    <url-pattern>/</url-pattern>
    <!-- 拦截素有资源，包括Jsp     -->
    <!--<url-pattern>/*</url-pattern>-->
  </servlet-mapping>
</web-app>

3、配置SpringMVC.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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置注解扫描包-->
    <context:component-scan base-package="com.wang"></context:component-scan>

    <!--开启springmvc注解 相当于配置了处理器映射器以及处理器适配器 -->
    <mvc:annotation-driven></mvc:annotation-driven>

    <!-- 视图解析器 -->
    <bean name="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp"></property>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>