【spring boot】3.spring boot项目，绑定资源文件为bean并使用

package com.sxd.beans;


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

/**
 * User实体
 * @Component 声明User实体为一个bean
 * @PropertySource 声明对应绑定了test.properties文件 【应对ConfigurationProperties注解取消掉location的属性】
 * @ConfigurationProperties 对应绑定前缀为com.sxd的属性名
 */
@Component
@PropertySource(value = "classpath:/test.properties")
@ConfigurationProperties(prefix = "com.sxd")
public class User {
    private String name;
    private Integer age;

    //资源文件中定义的是com.sxd.uuid而不是uu，这里的uu字段只是测试如果名称不对应，是否会赋值成功
    private String uu;
    private String resume;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getUu() {
        return uu;
    }

    public void setUu(String uu) {
        this.uu = uu;
    }

    public String getResume() {
        return resume;
    }

    public void setResume(String resume) {
        this.resume = resume;
    }
}

package com.sxd.secondemo;

import com.sxd.beans.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * spring boot 的主入口类
 * @RestController = @ResponseBody + @Controller
 * @SpringBootApplication  spring boot的核心注解
 * @EnableConfigurationProperties 激活绑定资源文件的Bean，例如这里的User.class或者更多
 */
@RestController
@SpringBootApplication
@EnableConfigurationProperties(User.class)
public class SecondemoApplication {

    /**
     * @Autowired  自动注入，需要@EnableConfigurationProperties中声明已经激活的Bean才能自动注入成功
     */
    @Autowired
    User user;

    /**
     * 请求地址为localhost:8080/即可访问到本方法
     * @return
     */
    @RequestMapping("/")
    public String hello(){
        /**
         * idea中 System.out.println()快捷方式为sout，然后Alt+Enter才能出来
         */
        System.out.println(user.getResume());

        return "打印简历:"+user.getResume()+"\n"+"uu是否有值："+user.getUu();
    }

    public static void main(String[] args) {
        SpringApplication.run(SecondemoApplication.class, args);
    }
}