三、属性赋值

使用@value的写法

1. 基本数据

2. SpEL #{}

3. ${},取出配置文件中的值

• Bean

public class Book {
    @Value("数据结构")
    private String name;
    @Value("#{20-3}")
    private Double price;
    @Value("${writer}")
    private String writer;
}

• 主配置类

@PropertySource(value={"classpath:/application.properties"})
@Configuration
public class MyConfigOfPropertyValues {
    @Bean
    public Book book(){
        return new Book();
    }
}

• application.properties

writer=jdy

 也可以使用环境变量对象获取

ConfigurableEnvironment environment = context.getEnvironment();
String writer = environment.getProperty("writer");