SpringMVC核心机制环境搭建

1.SpringMVC执行流程

1.基础流程图

2.详细流程图

2.安装Tomcat

1.下载

2.解压到任意目录即可

3.IDEA配置Tomcat

1.配置Deloyment

2.配置Server

3.创建maven项目

1.创建sun-springmvc模块（webapp）

2.查看是否被父模块管理

3.pom.xml引入依赖

<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/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.sunxiansheng</groupId><artifactId>core_mechanisms</artifactId><version>1.0-SNAPSHOT</version></parent><artifactId>sun-springmvc</artifactId><packaging>war</packaging><name>sun-springmvc Maven Webapp</name><url>http://maven.apache.org</url><dependencies><!-- servlet依赖 --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><!-- 作用范围表示在打包放到生产环境时不需要带上这个依赖，因为tomcat本身有 --><scope>provided</scope></dependency><!-- dom4j解析xml --><dependency><groupId>dom4j</groupId><artifactId>dom4j</artifactId><version>1.6.1</version></dependency><!-- commons-lang3 --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.5</version></dependency><!-- 引入日志 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId><version>2.4.2</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency></dependencies><build><finalName>sun-springmvc</finalName></build>
</project>

4.目录

5.SunDispatcherServlet.java

package com.sunxiansheng.springmvc.servlet;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;/*** Description: 中央控制器（本质是一个Servlet）* @Author sun* @Create 2024/8/6 15:33* @Version 1.0*/
public class SunDispatcherServlet extends HttpServlet {// 日志private static final Logger log = LoggerFactory.getLogger(SunDispatcherServlet.class);@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {log.info("SunDispatcherServlet doGet");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {log.info("SunDispatcherServlet doPost");}}

6.web.xml 配置中央控制器

<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><display-name>Archetype Created Web Application</display-name><!-- 配置中央控制器 --><servlet><servlet-name>SunDispatcherServlet</servlet-name><servlet-class>com.sunxiansheng.springmvc.servlet.SunDispatcherServlet</servlet-class><!-- 读取sunspringmvc.xml文件 --><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:sunspringmvc.xml</param-value></init-param><!-- 在Tomcat启动时就自动加载 --><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>SunDispatcherServlet</servlet-name><!-- 拦截所有请求（因为是中央控制器） --><url-pattern>/</url-pattern></servlet-mapping></web-app>

7.启动Tomcat测试访问