[Java知识库]SpringBoot入门HelloWorld

先创建一个maven工程

pom.xml文件配置springboot需要的依赖

<?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>com.jzs</groupId>
    <artifactId>boot-01-helloworld</artifactId>
    <version>1.0-SNAPSHOT</version>

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

    <!--父工程-->
    <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>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.4.RELEASE</version>
            </plugin>
        </plugins>
    </build>

</project>

创建springboot的主程序，写法固定

package com.jzs.boot;

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

/**
 * @author zhongshun
 * @date 2021/8/3 22:59
 */

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

测试HelloWorld

package com.jzs.boot.controller;

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

/**
 * @author zhongshun
 * @date 2021/8/3 23:01
 */

//@ResponseBody 和 @Controller的组合
@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String handle01() {
        return "Hello,SpringBoot2";
    }
}

运行直接运行创建的主程序类的main方法即可

如果想改某些配置，直接在resource目录下创建application.properties在里面更改即可