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_2_5.xsd"
version="2.5">
<!-- 学习前置条件 -->
<!-- 问题1：web.xml中servelet、filter、listener、context-param加载顺序 -->
<!-- 问题2：load-on-startup标签的作用，影响了Servlet对象创建的时机 -->
<!-- 问题3：url-pattern:标签的配置方式有四种：/dispatcherServlet、/servlet/*、*.do、/ 以上四种配置-->
<!-- 问题4：url-pattern标签的配置为什么配置/就不拦截jsp请求，而配置/*，就会拦截jsp请求 -->
<!-- 问题4原因：标签配置为/*报错，因为它拦截了jsp请求，但是又不能处理jsp请求。 -->
<!-- 问题5：配置了springmvc去读取spring配置文件之后，就产生了spring父子容器的问题 -->
<!-- 配置前端控制器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 设置spring配置文件路径 -->
<!-- 如果不设置初始化参数，那么DispatcherServlet会读取默认路径下的配置文件 -->
<!-- 默认配置文件路径：/WEB-INF/springmvc-servlet.xml -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!-- 指定初始化时机，设置为2，表示Tomcat启动时，它会跟随着启动，DispatcherServlet会跟随着初始化 -->
<!-- 如果没有指定初始化时机，DispatcherServlet就会在第一次被请求的时候，才会初始化，而且只会被初始化一次(单例模式) -->
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<!-- url-pattern的设置 -->
<!-- 不要配置为/*，否则报错 -->
<!-- 通俗解释：会拦截整个项目中的资源访问，包含JSP和静态资源的访问,对于JS的访问，springmvc提供了默认Handler处理器 -->
<!-- 但是对于JSP来讲，springmvc没有提供默认的处理器，我们也没有手动编写对应的处理器，此时按照springmvc的处理流程分析得知，它down了 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 处理器类的扫描 -->
<context:component-scan
base-package="com.cyb.springmvc.controller"></context:component-scan>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.cyb</groupId>
<artifactId>springmvc-demo01</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<!-- spring ioc组件需要的依赖包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.2.1.RELEASE</version>
</dependency>
<!-- 基于AspectJ的aop依赖 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<!-- spring MVC依赖包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.2.1.RELEASE</version>
</dependency>
<!-- jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<!-- 配置Maven的JDK编译级别 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<port>8080</port>
</configuration>
</plugin>
<!-- tomcat依赖包 -->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
</plugin>
</plugins>
</build>
</project>项目案例
链接: https://pan.baidu.com/s/1kzcrGlmhWzZeWuJ2FmLriA 密码: g64h
