Spring注解系列十八：属性赋值-@PropertySource

野性酷女 2022-02-03 01:23 379阅读 0赞

1、创建配置文件person.properties

person.name=李四
    person.age=20

2、使用@PropertySource读取外部配置文件中的k/v保存到运行的环境变量中;加载完外部的配置文件以后使用$\{\}取出配置文件的值。@PropertySource是可重复注解。也可以用@PropertySources注解指定多个PropertySource加载多个配置文件。

<context:property-placeholder location="classpath:person.properties"/>

@PropertySource(value={"classpath:/person.properties"})
    @Configuration
    public class MainConfigOfPropertyValues {
    	
    	@Bean
    	public Person person(){
    		return new Person();
    	}
    }

3、修改Person

//3、可以写${}；取出配置文件【properties】中的值（在运行环境变量里面的值）
    @Value("${person.name}")
    private String name;
    @Value("${person.age}")
    private Integer age;

4、测试

@Test
    public void test01(){
    	AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfPropertyValues.class);
    	String[] definitionNames = applicationContext.getBeanDefinitionNames();
    	for (String name : definitionNames) {
    		System.out.println(name);
    	}
    
    	Person person = (Person) applicationContext.getBean("person");
    	System.out.println(person);
    
    	ConfigurableEnvironment environment = applicationContext.getEnvironment();
    	String property = environment.getProperty("person.name");
    	System.out.println(property);
    
    	applicationContext.close();
    }

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