1.start.spring.io

简单的web例子

打开IDE中的项目，并在src/main/java/com/example/demo文件夹中找到DemoApplication.java文件。现在通过添加额外的方法和注释来更改文件的内容

2.例子的Demo1Application.java

package com.example.demo1;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class Demo1Application {

    public static void main(String[] args) {
        SpringApplication.run(Demo1Application.class, args);
    }

    @GetMapping("/hello")
    public String hello(@RequestParam(value = "name", defaultValue = "keny88888") String name) {
        return String.format("Hello %s!", name);
    }
}

3.运行mvnw spring-root:run

. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.5.RELEASE)

2020-02-28 20:00:18.506 INFO 9964 --- [ main] com.example.demo1.Demo1Application : Starting Demo1Application on kenychen-PC with PID 9964 (D:\IdeaProjects\demo1\target\classes started by kenychen in D:\IdeaProjects\demo1)
2020-02-28 20:00:18.513 INFO 9964 --- [ main] com.example.demo1.Demo1Application : No active profile set, falling back to default profiles: default
2020-02-28 20:00:21.453 INFO 9964 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-02-28 20:00:21.482 INFO 9964 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-02-28 20:00:21.483 INFO 9964 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.31]
2020-02-28 20:00:21.730 INFO 9964 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-02-28 20:00:21.731 INFO 9964 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3037 ms
2020-02-28 20:00:22.122 INFO 9964 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-02-28 20:00:22.390 WARN 9964 --- [ main] ion$DefaultTemplateResolverConfiguration : Cannot find template location: classpath:/templates/ (please add some templates or check your Thymeleaf configuration)
2020-02-28 20:00:22.863 INFO 9964 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-02-28 20:00:22.906 INFO 9964 --- [ main] com.example.demo1.Demo1Application : Started Demo1Application in 6.473 seconds (JVM running for 9.176)
2020-02-28 20:00:57.201 INFO 9964 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-02-28 20:00:57.201 INFO 9964 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-02-28 20:00:57.214 INFO 9964 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 13 ms