Spring Boot读取配置文件内容的3种方式(@Value、Environment和@ConfigurationProperties)

name: 心态还需努力呀
 
#对象
person:
  name: lisi
  age: 20
 
#数组
address:
  - shanghai
  - beijing

package com.imust.controller;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class HelloController {
    @Value("${name}")
    private String name;
//    获取对象
    @Value("${person.name}")
    private String person_name;
 
    @Value("${person.age}")
    private int person_age;
 
//    获取数组
    @Value("${address[0]}")
    private String address1;
 
    @Value("${address[1]}")
    private String address2;
 
    @RequestMapping("/hello")
    public String hello(){
        System.out.println(name);
        System.out.println(person_name);
        System.out.println(person_age);
        System.out.println(address1);
        System.out.println(address2);
        System.out.println("========================");
        return "Hello,Spring Boot!";
    }
}

@Autowired
    private Environment env;

System.out.println(env.getProperty("name"));
System.out.println(env.getProperty("person.name"));
System.out.println(env.getProperty("person.age"));
System.out.println(env.getProperty("address[0]"));

package com.imust.pojo;
 
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
 
@Component
@ConfigurationProperties
public class Person {
    private String name;
    private int age;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

@ConfigurationProperties(prefix = "person")

@Autowired
    private Person person;

System.out.println(person.toString());