SpringBoot 初始
需求描述
通过spring boot搭建并配置简单的服务实例,通过访问http://localhost:8080/index显示
{"上海":"一线城市","合肥":"二线城市"}
解决方法
下载模板
Step1:从springboot官网下载模板,当前选择是maven工程、Java 8、WAR方式、Springboot 版本为2.6.2,详见下图:
https://start.spring.io/
导入工程
Step2:在IntelliJ IDEA里导入已存在项目,详见下图:
编写控制类
Step3:com.demo下新建包controller并在其下建立IndexController类,类代码见下:
package com.demo.controller;
import org.springframework.web.bind.annotation.*;
import java.util.HashMap;
import java.util.Map;
@RestController
public class IndexController {
@RequestMapping("/index")
public Map <String,String> index() {
Map map = new HashMap<String, String>();
map.put("合肥","二线城市");
map.put("上海","一线城市");
return map;
}
}
配置应用类
Step4:在DemoApplication类里配置注解@ComponentScan(要扫描的包),详见如下代码:
package com.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(basePackages = {"com.demo.controller"})
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
启动服务
Step5:启动服务(右键Step4里的DemoApplication类运行),访问服务(http://localhost:8080/index)