Spring Boot 读取properties文件中的属性值2种方式（@ConfigurationProperties、@Value）

淡淡的烟草味﹌ 2023-01-08 05:19 168阅读 0赞

## 1 properties文件配置 ##

car.brand=BYD
    car.price=100000

## 2 读取properties文件中的属性值 ##

### 2.1 @ConfigurationProperties ###

@ConfigurationProperties可以读取所有前缀为car的属性，并将properties属性值装配给跟相同属性名的Car实例成员。

package com.entity;
    @Component
    @ConfigurationProperties(prefix = "car")
    public class Car {
        private String brand;
        private String price;
    
        public Car() {
        }
    
        public Car(String brand, String price) {
            this.brand = brand;
            this.price = price;
        }
    
        public String getBrand() {
            return brand;
        }
    
        public void setBrand(String brand) {
            this.brand = brand;
        }
    
        public String getPrice() {
            return price;
        }
    
        public void setPrice(String price) {
            this.price = price;
        }
    }

### 2.2 @Value ###

@Value可以单个属性的值装配给Car实例成员，装配时不要求属性名和实例成员名相同。

package com.entity;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    @Component
    public class Car {
        @Value("${car.brand}")
        private String brand;
        @Value("${car.price}")
        private String price;
    
        public Car() {
        }
    
        public Car(String brand, String price) {
            this.brand = brand;
            this.price = price;
        }
    
        public String getBrand() {
            return brand;
        }
    
        public void setBrand(String brand) {
            this.brand = brand;
        }
    
        public String getPrice() {
            return price;
        }
    
        public void setPrice(String price) {
            this.price = price;
        }
    }

## 3 Controller ##

package com.controller;
    
    import com.entity.Car;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class PageController {
        @Autowired
        private Car car;
        @RequestMapping("/car")
        public Car car(){
            return car;
        }
    }

## 4 页面调试  ##

![20210119094958261.png][]

注：使用 @ConfigurationProperties注解之前要先加入@Component注解。

[20210119094958261.png]: /images/20221119/bd5e2186ffd644edbf712827b8b021cf.png