6.SpringBoot入门程序

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SpringBoot入门程序

1. 环境要求

  1. JDK1.8
  2. maven3.x
  3. spring tools suite3.9
  4. springboot2.x版本
  5. spring5

2. 创建项目

2.1 方式1

https://start.spring.io/

再导入

2.2 方式2

3. 项目目录说明

resource/static/: 存放web的静态资源文件，如images, css, js等
resources/templates: 存放模板引擎的文件，类比于WEB项目的WEB-INF
application.properties: SpringBoot的核心配置文件
test/java/ApplicationTests.java: 测试文件

4. 项目依赖说明

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<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<!-- parent -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.4.1</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<!-- current project -->
	<groupId>com.example</groupId>
	<artifactId>demo</artifactId>
	<version>1.0</version>
	<name>demo</name>
	<description>Spring Boot demo</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!-- SpringBoot SpringWeb -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<!-- SpringBoot test -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

5. 创建Controller

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package com.example.demo.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloWorldController {

	@RequestMapping("hello")
	public String sayHello() {
		return "Hello World!";
	}
}

6. 启动项目

SpringBoot启动类右键->Run as->Java Application或者Spring Boot App

项目右键->Run as->Spring Boot App

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mvn package
java -jar demo-1.0.jar

查看结果:

http://localhost:8080/hello

7. banner的修改

spring Boot启动的时候会有一个默认的启动图案。如下: 

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  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.4.1)

(1)在src/main/resources路径下新建一个banner.txt文件，并输入想要的内容即可。

(2)在线生成图案的网站http://www.network-science.de/ascii/

将生成的图案粘贴进banner.txt文件，并启动

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 ____             _             ____              _   
/ ___| _ __  _ __(_)_ __   __ _| __ )  ___   ___ | |_ 
\___ \| '_ \| '__| | '_ \ / _` |  _ \ / _ \ / _ \| __|
 ___) | |_) | |  | | | | | (_| | |_) | (_) | (_) | |_ 
|____/| .__/|_|  |_|_| |_|\__, |____/ \___/ \___/ \__|
      |_|                 |___/                       
      
2021-01-10 19:23:16.503  INFO 12036 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 1.8.0_271 on DESKTOP-IOB28AF with PID 12036 (E:\SpringToolSuite\project\demo-4.8.1\demo\target\classes started by Tom in E:\SpringToolSuite\project\demo-4.8.1\demo)
2021-01-10 19:23:16.505  INFO 12036 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2021-01-10 19:23:17.317  INFO 12036 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-01-10 19:23:17.326  INFO 12036 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-01-10 19:23:17.326  INFO 12036 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.41]
2021-01-10 19:23:17.375  INFO 12036 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-01-10 19:23:17.375  INFO 12036 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 836 ms
2021-01-10 19:23:17.519  INFO 12036 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-01-10 19:23:17.660  INFO 12036 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-01-10 19:23:17.669  INFO 12036 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.439 seconds (JVM running for 1.759)

也可以关闭banner

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package com.example.demo;

import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

	public static void main(String[] args) {
		// SpringApplication.run(DemoApplication.class, args);
		SpringApplication springApplication = new SpringApplication(DemoApplication.class);
		springApplication.setBannerMode(Banner.Mode.OFF);
		springApplication.run(args);
		
	}

}