纯手写springboot实现javam046266503的博客-

<dependencies> <!-- Java语言操作tomcat --> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-core</artifactId> <version>8.5.28</version> </dependency> <!-- spring-web --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.0.4.RELEASE</version> <scope>compile</scope> </dependency> <!-- spring-mvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.0.4.RELEASE</version> <scope>compile</scope> </dependency> <!-- tomcat对jsp支持 --> <dependency> <groupId>org.apache.tomcat</groupId> <artifactId>tomcat-jasper</artifactId> <version>8.5.28</version> </dependency> </dependencies> 

SplittrWebAppInitializer

package com.itmayiedu.config; import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer; /**  * 加载springmvc的dispatcherservlet  * @author yb  *这个类实现web.xml功能  */ //AbstractAnnotationConfigDispatcherServletInitializer初始化DispatcherServlet public class SplittrWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { //加载根配置信息  spring核心 @Override protected Class<?>[] getRootConfigClasses() { return new Class[] {RootConfig.class}; } //springmvc加载配置信息 @Override protected Class<?>[] getServletConfigClasses() { return new Class[] {WebConfig.class}; } //springmvc 拦截url映射  "/"表示拦截所有请求 @Override protected String[] getServletMappings() { return new String[] {"/"}; } } 

RootConfig

package com.itmayiedu.config; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; /**  * 根配置  * @author yb  *这个类实现spring.xml功能，即spring核心  */ @Configuration @ComponentScan("com.itmayiedu") public class RootConfig { } 

WebConfig

package com.itmayiedu.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.ViewResolver; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import org.springframework.web.servlet.view.InternalResourceViewResolver; /**  * springmvc配置信息  * @author yb  *这个类实现springmvc.xml功能  */ //WebMvcConfigurerAdapter表示可以配置一些springmvc配置信息 @Configuration//加载配置文件 @EnableWebMvc//开启springmvc功能,如扫包、视图展示器等 @ComponentScan(basePackages = {"com.itmayiedu.controller"}) public class WebConfig extends WebMvcConfigurerAdapter{ //需要配置视图转换器 @Bean public ViewResolver viewResolver() {   InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();   viewResolver.setPrefix("/WEB-INF/views/");   viewResolver.setSuffix(".jsp"); //可以在jsp页面中通过${}访问beans   viewResolver.setExposeContextBeansAsAttributes(true); return viewResolver; } } 

IndexController

package com.itmayiedu.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.itmayiedu.service.UserService; @RestController public class IndexController { @Autowired private UserService userservice; @RequestMapping(value="/index",produces = "text/html;charset=UTF-8") public String index() { return userservice.index(); } } 

UserController

package com.itmayiedu.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class UserController { @RequestMapping("/pageIndex") public String pageIndex() { return "pageIndex"; } } 

UserService

package com.itmayiedu.service; import org.springframework.stereotype.Service; @Service public class UserService { public String index() { return "springBoot 2.0 yb finsh"; } } 

启动类AppTomcat

package com.itmayiedu; import java.io.File; import javax.servlet.ServletException; import org.apache.catalina.LifecycleException; import org.apache.catalina.WebResourceRoot; import org.apache.catalina.core.StandardContext; import org.apache.catalina.startup.Tomcat; import org.apache.catalina.startup.Tomcat.FixContextListener; import org.apache.catalina.webresources.DirResourceSet; import org.apache.catalina.webresources.StandardRoot; public class AppTomcat { public static void main(String[] args) throws ServletException, LifecycleException { //使用Java内置Tomcat运行SpringMVC框架 //原理:springmvc注解方式启动，就会创建springmvc容器 //创建tomcat服务器   Tomcat tomcatServer = new Tomcat(); //指定端口号   tomcatServer.setPort(9090); //是否设置自动部署  false表示不设置 //  tomcatServer.getHost().setAutoDeploy(false); //读取项目路径   加载静态资源   StandardContext ctx = (StandardContext)tomcatServer.addWebapp("/",new File("src/main").getAbsolutePath()); //禁止重新载入   ctx.setReloadable(false); //class文件读取地址   File additionWebInfClasses = new File("target/classes"); //创建WebRoot   WebResourceRoot resources = new StandardRoot(ctx); //tomcat内部读取Class执行   resources.addPreResources(new DirResourceSet(resources,"/WEB-INF/classes",additionWebInfClasses.getAbsolutePath(),"/"));   tomcatServer.start();   System.out.println("tomcat服务器启动了"); //异步进行接收请求   tomcatServer.getServer().await(); } } 

pgeIdex.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"     pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "https://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>yb</title> </head> <body> <h1>纯手写springboot框架整合jsp</h1> </body> </html>