springboot中使用@ConfigurationProperties从配置文件中取值

怼烎@ 2022-01-22 12:59 334阅读 0赞

我们在application.properties中写了book的一些属性

book.name="活着"
    book.price=100
    book.size="大"

然后，我们新建一个类，book

package com.lyb.demo.model;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    import org.springframework.validation.annotation.Validated;
    
    import javax.validation.constraints.Email;
    
    @ConfigurationProperties(prefix = "book")
    @Component
    public class book {
        private String name;
        private int price;
        private String size;
    
        @Override
        public String toString() {
            return "book{" +
                    "name='" + name + '\'' +
                    ", price=" + price +
                    ", size='" + size + '\'' +
                    '}';
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getPrice() {
            return price;
        }
    
        public void setPrice(int price) {
            this.price = price;
        }
    
        public String getSize() {
            return size;
        }
    
        public void setSize(String size) {
            this.size = size;
        }
    }

可以看到，我们使用了@Component 将book交给spring管理，使用@ConfigurationProperties(prefix="book")将配置文件中的book的值映射到book类中，

我们编写测试类

看是否能从配置文件中取出值并成功映射到类中

@Autowired
    private book book1;
    @Test
        public void testConfigrationProperties(){
            System.out.print(book1.toString());
        }

运行就可以看到输出了配置文件中的值了