1.目錄結構

2.編寫

1.application.properties 新增配置

author.name=wen
author.age=24

2.型別安全的Bean

package com.wen.springBoot.config;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
//載入properties檔案內的配置，通過prefix屬性指定properties的配置的字首
 

@ConfigurationProperties(prefix="author")
public class AuthorSettings {

    private String name;
    private Long age;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Long getAge() {
        return age;
    }
    public
 
 void setAge(Long age) {
        this.age = age;
    }



}

3.入口類

package com.wen.springBoot;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework
 
.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.wen.springBoot.config.AuthorSettings;

@RestController
//Spring Boot專案核心註解，開啟自動配置
//組合了@Configuration、@EnableAutoConfiguration、@ComponentScan
//@EnableAutoConfiguration讓Spring Boot根據類路徑jar包依賴為當前專案進行自動配置
//Spring Boot會自動掃描@SpringBootApplication所在類的同級包及下級包的Bean
@SpringBootApplication
public class DemoApplication {

    //直接注入配置
    @Autowired
    private AuthorSettings authorSettings;

    @RequestMapping("/")
    String index(){
        return "authorName:"+authorSettings.getName()+" authorAge:"+authorSettings.getName();
    }

    public static void main(String[] args) {//main方法，專案啟動入口
        SpringApplication.run(DemoApplication.class, args);
    }
}

3.執行

入口類→右鍵→Run As→Java Application 待專案部署， 訪問http://localhost:8080