SpringBoot2-HelloWorld

参考官方文档：

Getting Started

创建maven工程 

引入依赖

<?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>org.example</groupId>
    <artifactId>com.shu</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
    </parent>


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

    </dependencies>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

</project>

创建主程序

package com.zs.boot;

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

/**
 * 主程序类
 * @SpringBootApplication：这是一个SpringBoot应用
 */
@SpringBootApplication
public class MainApplication {
    public static void main(String[] args) {
        SpringApplication.run(MainApplication.class,args);
    }
}

编写业务

package com.zs.boot.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

/*@Controller
@ResponseBody*/
@RestController
public class HelloController {
    @RequestMapping("/hello")
    public String handle01(){
        return "Hello spring boot2";
    }
}

直接运行main方法

C:\Java\jdk1.8.0_241\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always "-javaagent:C:\IntelliJ IDEA 2021.1.1\lib\idea_rt.jar=12964:C:\IntelliJ IDEA 2021.1.1\bin" -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath C:\Java\jdk1.8.0_241\jre\lib\charsets.jar;C:\Java\jdk1.8.0_241\jre\lib\deploy.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\access-bridge-64.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\cldrdata.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\dnsns.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\jaccess.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\jfxrt.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\localedata.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\nashorn.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\sunec.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\sunjce_provider.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\sunmscapi.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\sunpkcs11.jar;C:\Java\jdk1.8.0_241\jre\lib\ext\zipfs.jar;C:\Java\jdk1.8.0_241\jre\lib\javaws.jar;C:\Java\jdk1.8.0_241\jre\lib\jce.jar;C:\Java\jdk1.8.0_241\jre\lib\jfr.jar;C:\Java\jdk1.8.0_241\jre\lib\jfxswt.jar;C:\Java\jdk1.8.0_241\jre\lib\jsse.jar;C:\Java\jdk1.8.0_241\jre\lib\management-agent.jar;C:\Java\jdk1.8.0_241\jre\lib\plugin.jar;C:\Java\jdk1.8.0_241\jre\lib\resources.jar;C:\Java\jdk1.8.0_241\jre\lib\rt.jar;D:\com.shu\target\classes;D:\repository\org\springframework\boot\spring-boot-starter-web\2.3.4.RELEASE\spring-boot-starter-web-2.3.4.RELEASE.jar;D:\repository\org\springframework\boot\spring-boot-starter\2.3.4.RELEASE\spring-boot-starter-2.3.4.RELEASE.jar;D:\repository\org\springframework\boot\spring-boot\2.3.4.RELEASE\spring-boot-2.3.4.RELEASE.jar;D:\repository\org\springframework\boot\spring-boot-autoconfigure\2.3.4.RELEASE\spring-boot-autoconfigure-2.3.4.RELEASE.jar;D:\repository\org\springframework\boot\spring-boot-starter-logging\2.3.4.RELEASE\spring-boot-starter-logging-2.3.4.RELEASE.jar;D:\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\repository\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.jar;D:\repository\org\apache\logging\log4j\log4j-to-slf4j\2.13.3\log4j-to-slf4j-2.13.3.jar;D:\repository\org\apache\logging\log4j\log4j-api\2.13.3\log4j-api-2.13.3.jar;D:\repository\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;D:\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\repository\org\springframework\spring-core\5.2.9.RELEASE\spring-core-5.2.9.RELEASE.jar;D:\repository\org\springframework\spring-jcl\5.2.9.RELEASE\spring-jcl-5.2.9.RELEASE.jar;D:\repository\org\yaml\snakeyaml\1.26\snakeyaml-1.26.jar;D:\repository\org\springframework\boot\spring-boot-starter-json\2.3.4.RELEASE\spring-boot-starter-json-2.3.4.RELEASE.jar;D:\repository\com\fasterxml\jackson\core\jackson-databind\2.11.2\jackson-databind-2.11.2.jar;D:\repository\com\fasterxml\jackson\core\jackson-annotations\2.11.2\jackson-annotations-2.11.2.jar;D:\repository\com\fasterxml\jackson\core\jackson-core\2.11.2\jackson-core-2.11.2.jar;D:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.11.2\jackson-datatype-jdk8-2.11.2.jar;D:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.11.2\jackson-datatype-jsr310-2.11.2.jar;D:\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.11.2\jackson-module-parameter-names-2.11.2.jar;D:\repository\org\springframework\boot\spring-boot-starter-tomcat\2.3.4.RELEASE\spring-boot-starter-tomcat-2.3.4.RELEASE.jar;D:\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.38\tomcat-embed-core-9.0.38.jar;D:\repository\org\glassfish\jakarta.el\3.0.3\jakarta.el-3.0.3.jar;D:\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.38\tomcat-embed-websocket-9.0.38.jar;D:\repository\org\springframework\spring-web\5.2.9.RELEASE\spring-web-5.2.9.RELEASE.jar;D:\repository\org\springframework\spring-beans\5.2.9.RELEASE\spring-beans-5.2.9.RELEASE.jar;D:\repository\org\springframework\spring-webmvc\5.2.9.RELEASE\spring-webmvc-5.2.9.RELEASE.jar;D:\repository\org\springframework\spring-aop\5.2.9.RELEASE\spring-aop-5.2.9.RELEASE.jar;D:\repository\org\springframework\spring-context\5.2.9.RELEASE\spring-context-5.2.9.RELEASE.jar;D:\repository\org\springframework\spring-expression\5.2.9.RELEASE\spring-expression-5.2.9.RELEASE.jar com.zs.boot.MainApplication

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.4.RELEASE)

2021-11-01 22:23:07.326  INFO 7008 --- [           main] com.zs.boot.MainApplication              : Starting MainApplication on ZHOU-PC with PID 7008 (D:\com.shu\target\classes started by ZHOU in D:\com.shu)
2021-11-01 22:23:07.339  INFO 7008 --- [           main] com.zs.boot.MainApplication              : No active profile set, falling back to default profiles: default
2021-11-01 22:23:10.969  INFO 7008 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-11-01 22:23:10.996  INFO 7008 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-11-01 22:23:10.997  INFO 7008 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.38]
2021-11-01 22:23:11.243  INFO 7008 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-11-01 22:23:11.243  INFO 7008 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3518 ms
2021-11-01 22:23:11.834  INFO 7008 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-11-01 22:23:12.457  INFO 7008 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-11-01 22:23:12.519  INFO 7008 --- [           main] com.zs.boot.MainApplication              : Started MainApplication in 7.153 seconds (JVM running for 16.251)

浏览器访问

---

简化配置

以后所有的配置都可以在这里写，例如：端口号修改为8888

---

简化部署

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

打jar包