技術標籤：Spring Boot

1 properties檔案配置

car.brand=BYD
car.price=100000

2讀取properties檔案中的屬性值

2.1 @ConfigurationProperties

@ConfigurationProperties可以讀取所有字首為car的屬性，並將properties屬性值裝配給跟相同屬性名的Car例項成員。

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可以單個屬性的值裝配給Car例項成員，裝配時不要求屬性名和例項成員名相同。

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 頁面除錯

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