SpringBoot：实例一

一、实现的效果

在浏览器地址栏输入http://localhost:8080/hello，当前页面显示hello world

实例一代码：点击查看LearnSpringBoot01

点击查看更多的SpringBoot教程

二、效果图

三、 pom.xml代码

<?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><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.0</version></parent><groupId>org.example</groupId><artifactId>LearnSpringBoot01</artifactId><version>1.0-SNAPSHOT</version><properties><java.version>15</java.version><maven.compiler.source>15</maven.compiler.source><maven.compiler.target>15</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies><!--Spring Boot插件，将应用打包成一个可执行的jar包原文链接：https://blog.csdn.net/qheuwq/article/details/130953123--><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

四、HelloController.java代码

package org.example.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;//这个类所有方法返回的数据直接写给浏览器，（如果是对象转换为json数据）
//@ResponseBody
//@Controller
@RestController // 等于上面 ResponseBody 加 Controller
public class HelloController {
//    @ResponseBody@RequestMapping("/hello")public String hello(){return "hello world";}
}

五、HelloWorldMainApplication.java代码

package org.example;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RestController;/*** https://www.bilibili.com/video/av59572480/?p=5&spm_id_from=pageDriver&vd_source=4110e082785c06a8c24a5c86c6182472** SpringBootApplication 来标注一个主程序类，说明这是一个spring boot应用** SpringBoot出现找不到或无法加载主类解决办法  ： 点击项目的目录，鼠标右键选择Maven->Reload Project，或者进行mvn clean后重新运行* https://blog.csdn.net/github_38924695/article/details/128236420*/
//@RestController
@SpringBootApplication
public class HelloWorldMainApplication {public static void main(String[] args) {//Spring 来启动应用SpringApplication.run(HelloWorldMainApplication.class, args);}
}