Spring注解系列十七：属性赋值-@Value

1、MainConfigOfPropertyValues

@Configuration
public class MainConfigOfPropertyValues {
	
	@Bean
	public Person person(){
		return new Person();
	}
}

2、创建组件Person

public class Person {

	/**
	 * 使用@Value赋值：
	 * 		1、基本数值
	 * 		2、可以写SpEL； #{}
	 * 		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("zhangsan")
	private String name;
	@Value("#{20-2}")
	private Integer age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	
	public Person(String name, Integer age) {
		super();
		this.name = name;
		this.age = age;
	}
	public Person() {
		super();
	}
	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + "]";
	}
	
}

3、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);

	applicationContext.close();
}