Intellij创建简单Springboot项目
第一步：选择创建新项目——file-new-project
第二步：选择项目类型——Spring Initializr-next
第三步：输入项目信息——Spring Initializr-next
第四步：选择Spring组建——web-web(勾选)
第五步：修改项目名称和项目路径(默认即可)——Finish
第六步：写一个Demo Controller层（controller的代码必须和SpringbootDemoApplication.java位于同级目录或之下）
//Main方法，项目从这里iahsi启动，是项目创建时自动生成的；package com.example.springboot_demo;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class SpringbootDemoApplication { public static void main(String[] args) { SpringApplication.run(SpringbootDemoApplication.class, args); }}
//自定义Controller方法(注意@RestController的使用)package com.example.springboot_demo.controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class DemoController { @RequestMapping("/login") public String login(){ return "login success!"; }}
第七步：启动项目，并用浏览器访问项目
//启动日志输出 . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.1.0.RELEASE)2018-11-29 09:47:16.011 INFO 14668 --- [ main] c.e.s.SpringbootDemoApplication : No active profile set, falling back to default profiles: default2018-11-29 09:47:17.710 INFO 14668 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)2018-11-29 09:47:17.734 INFO 14668 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]2018-11-29 09:47:17.735 INFO 14668 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.122018-11-29 09:47:17.899 INFO 14668 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2018-11-29 09:47:17.899 INFO 14668 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1802 ms2018-11-29 09:47:17.933 INFO 14668 --- [ main] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]2018-11-29 09:47:17.939 INFO 14668 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]2018-11-29 09:47:17.940 INFO 14668 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]2018-11-29 09:47:17.940 INFO 14668 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'formContentFilter' to: [/*]2018-11-29 09:47:17.940 INFO 14668 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]2018-11-29 09:47:18.203 INFO 14668 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'2018-11-29 09:47:18.482 INFO 14668 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''2018-11-29 09:47:18.487 INFO 14668 --- [ main] c.e.s.SpringbootDemoApplication : Started SpringbootDemoApplication in 3.183 seconds (JVM running for 4.749)
备注：一开始在DemoController上用@Controller注解，发现不起效果；原来@RestController和@Controller是有区别的。
通过查看@RestController的源码发现：@RestController注解 = @ResponseBody ＋ @Controller
package org.springframework.web.bind.annotation;import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;import org.springframework.core.annotation.AliasFor;import org.springframework.stereotype.Controller;@Target({ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documented@Controller@ResponseBodypublic @interface RestController { @AliasFor( annotation = Controller.class ) String value() default "";}
参考资料：
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