idea+maven+tomcat+spring 创建一个jsp项目

概述：我真服了，这个垃圾学校还在教jsp，这种技术我虽然早会了，但是之前搞的大多都是springboot web类型的，这里我就复习一下，避免以后忘记这种垃圾技术

第一步：创建maven项目

第二步：添加依赖

pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<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>org.cyl</groupId>
    <artifactId>demo001</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>9.0.19</version>
        </dependency>
    </dependencies>

</project>

第三步：开始配置tomcat

第四步：开始配置项目

然后点击apply即可

将依赖全部引入WEB-INF下的lib里面（在idea里面的目录是不会显示的）

第五步：写点jsp文件

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	登录页面！
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	注册页面！
</body>
</html>

项目结构：

第六步：编写controller文件

package org.cyl.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/**“@Controller”表示IndexController的实例是一个控制器
 * @Controller相当于@Controller("indexController")
 * 或@Controller(value = "indexController")
 */
@Controller
@RequestMapping("/index")
public class IndexController {
	@RequestMapping("/login")
	public String login() {
		/**login代表逻辑视图名称，需要根据Spring MVC配置
		 * 文件中internalResourceViewResolver的前缀和后缀找到对应的物理视图
		 */
		return "login";
	}
	@RequestMapping("/register")
	public String register() {
		return "register";
	}
}

第七步：编写配置文件

package org.cyl.config;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration.Dynamic;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;
public class WebConfig implements WebApplicationInitializer{
	@Override
	public void onStartup(ServletContext arg0) throws ServletException {
		AnnotationConfigWebApplicationContext ctx 
		= new AnnotationConfigWebApplicationContext();
		ctx.register(SpringMVCConfig.class);//注册Spring MVC的Java配置类SpringMVCConfig
		ctx.setServletContext(arg0);//和当前ServletContext关联
		/**
		 * 注册Spring MVC的DispatcherServlet
		 */
		Dynamic servlet = arg0.addServlet("dispatcher", new DispatcherServlet(ctx));
		servlet.addMapping("/");
		servlet.setLoadOnStartup(1);
	}
}

package org.cyl.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@EnableWebMvc
@ComponentScan("org.cyl.controller")
public class SpringMVCConfig implements WebMvcConfigurer {
	/**
	 * 配置视图解析器
	 */
	@Bean
	public InternalResourceViewResolver getViewResolver() {
		InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
		viewResolver.setPrefix("/WEB-INF/jsp/");
		viewResolver.setSuffix(".jsp");
		return viewResolver;
	}
	/**
	 * 配置静态资源
	 */
	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {
		registry.addResourceHandler("/html/**").addResourceLocations("/html/");
	}
}