Spring注解系列十七：属性赋值-@Value

电玩女神 2022-02-03 01:07 307阅读 0赞

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();
    }

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