SpringBoot 2.x 学习笔记（1）：入门实例（IntelliJ IDEA）

程裕强

发布于 2022-05-06 20:44:46

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发布于 2022-05-06 20:44:46

文章被收录于专栏：大数据学习笔记大数据学习笔记

（1）创建新项目

（2）Spring Initializr

（3）输入项目元数据

（4）选择依赖包

（5）项目存放路径

（6）默认生成的pom.xml

<?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>cn.hadron</groupId>
	<artifactId>springboot</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>springboot</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.3.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

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

		<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>

注意，为了加快相关jar下载速度，可以在pom.xml中添加国内的阿里Maven镜像，在<properties>...</properties>元素后添加如下元素即可

 <repositories>
    <repository>
      <id>nexus-aliyun</id>
      <name>Nexus aliyun</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public</url>
    </repository>
  </repositories>

（7）等待项目创建完成

（8）生成的默认SpringbootApplication

package cn.hadron.springboot;

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

@SpringBootApplication
public class SpringbootApplication {

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

（9）新建控制器

package cn.hadron.springboot.controller;
import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.ResponseBody; 
@Controller 
public class HelloController {    
	@RequestMapping("/hello")    
	@ResponseBody    
	public String hello() {
	        return "Hello，Spring Boot 2.0 ！";    
    } 
}

package cn.hadron.springboot.controller;
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 
@RestController 
public class HiController {    
	@RequestMapping("/hi")    
	public String hi() {
	        return "Hi，Spring Boot 2.0 ！";    
    } 
}

（10）运行单击绿色的三角按钮，运行程序

/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* "C:\Program Files\Java\jdk1.8.0_112\bin\java" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=50042 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2017.2.5\lib\idea_rt.jar=50043:C:\Program Files\JetBrains\IntelliJ IDEA 2017.2.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_112\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_112\jre\lib\rt.jar;D:\IdeaProjects\springboot\target\classes;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.0.3.RELEASE\spring-boot-starter-web-2.0.3.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter\2.0.3.RELEASE\spring-boot-starter-2.0.3.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot\2.0.3.RELEASE\spring-boot-2.0.3.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.0.3.RELEASE\spring-boot-autoconfigure-2.0.3.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.0.3.RELEASE\spring-boot-starter-logging-2.0.3.RELEASE.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.10.0\log4j-to-slf4j-2.10.0.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-api\2.10.0\log4j-api-2.10.0.jar;C:\Users\Administrator\.m2\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;C:\Users\Administrator\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\Administrator\.m2\repository\org\yaml\snakeyaml\1.19\snakeyaml-1.19.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.0.3.RELEASE\spring-boot-starter-json-2.0.3.RELEASE.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.6\jackson-databind-2.9.6.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.6\jackson-core-2.9.6.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.6\jackson-datatype-jdk8-2.9.6.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.6\jackson-datatype-jsr310-2.9.6.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.6\jackson-module-parameter-names-2.9.6.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.0.3.RELEASE\spring-boot-starter-tomcat-2.0.3.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\8.5.31\tomcat-embed-core-8.5.31.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\8.5.31\tomcat-embed-el-8.5.31.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\8.5.31\tomcat-embed-websocket-8.5.31.jar;C:\Users\Administrator\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.10.Final\hibernate-validator-6.0.10.Final.jar;C:\Users\Administrator\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\Administrator\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\classmate\1.3.4\classmate-1.3.4.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-web\5.0.7.RELEASE\spring-web-5.0.7.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-beans\5.0.7.RELEASE\spring-beans-5.0.7.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-webmvc\5.0.7.RELEASE\spring-webmvc-5.0.7.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-aop\5.0.7.RELEASE\spring-aop-5.0.7.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-context\5.0.7.RELEASE\spring-context-5.0.7.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-expression\5.0.7.RELEASE\spring-expression-5.0.7.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-core\5.0.7.RELEASE\spring-core-5.0.7.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-jcl\5.0.7.RELEASE\spring-jcl-5.0.7.RELEASE.jar" cn.hadron.springboot.SpringbootApplication
*/

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.3.RELEASE)

2018-07-17 23:29:19.749  INFO 2388 --- [           main] c.h.springboot.SpringbootApplication     : Starting SpringbootApplication on Win7 with PID 2388 (D:\IdeaProjects\springboot\target\classes started by Administrator in D:\IdeaProjects\springboot)
2018-07-17 23:29:19.765  INFO 2388 --- [           main] c.h.springboot.SpringbootApplication     : No active profile set, falling back to default profiles: default
2018-07-17 23:29:19.812  INFO 2388 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@2145433b: startup date [Tue Jul 17 23:29:19 CST 2018]; root of context hierarchy
2018-07-17 23:29:21.278  INFO 2388 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-07-17 23:29:21.325  INFO 2388 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-07-17 23:29:21.325  INFO 2388 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.31
2018-07-17 23:29:21.340  INFO 2388 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jdk1.8.0_112\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Java\jdk1.8.0_112\bin;C:\Program Files (x86)\Common Files\NetSarang;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Git\cmd;D:\hadoop-2.7.3\bin;D:\apache-maven-3.5.0\bin;C:\Program Files (x86)\Common Files\Thunder Network\KanKan\Codecs;C:\Users\Administrator\AppData\Local\Programs\Python\Python35-32\Scripts\;C:\Users\Administrator\AppData\Local\Programs\Python\Python35-32\;.]
2018-07-17 23:29:21.530  INFO 2388 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-07-17 23:29:21.530  INFO 2388 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1718 ms
2018-07-17 23:29:21.670  INFO 2388 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2018-07-17 23:29:21.670  INFO 2388 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-07-17 23:29:21.670  INFO 2388 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-07-17 23:29:21.670  INFO 2388 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-07-17 23:29:21.670  INFO 2388 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-07-17 23:29:21.810  INFO 2388 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-17 23:29:22.029  INFO 2388 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@2145433b: startup date [Tue Jul 17 23:29:19 CST 2018]; root of context hierarchy
2018-07-17 23:29:22.076  INFO 2388 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String cn.hadron.springboot.controller.HelloController.hello()
2018-07-17 23:29:22.076  INFO 2388 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hi]}" onto public java.lang.String cn.hadron.springboot.controller.HiController.hi()
2018-07-17 23:29:22.093  INFO 2388 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-07-17 23:29:22.093  INFO 2388 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-07-17 23:29:22.109  INFO 2388 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-17 23:29:22.109  INFO 2388 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-17 23:29:22.280  INFO 2388 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-07-17 23:29:22.358  INFO 2388 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-07-17 23:29:22.374  INFO 2388 --- [           main] c.h.springboot.SpringbootApplication     : Started SpringbootApplication in 3.202 seconds (JVM running for 6.423)