SpringBoot的属性赋值@Value的用法说明

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

public class Person { 
    /*
     * 使用@Value赋值：
     *     1. 基本数值
     *     2. 可以写 #{ }
     *     3. 可以写 ${ }，取出配置文件{properties}中的值
     */
    
    @Value("张三")
    private String name;
    @Value("#{20-2}")
    private int age;
    @Value("${person.nickName}")
    private String nickName;
    
    public String getNickName() {
        return nickName;
    }
    public void setNickName(String nickName) {
        this.nickName = nickName;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", nickName=" + nickName + "]";
    }
    public Person(String name, int age, String nickName) {
        super();
        this.name = name;
        this.age = age;
        this.nickName = nickName;
    }
    public Person() {
        super();
        // TODO Auto-generated constructor stub
    }    
}

person.nickName=\u5C0F\u4E09

public class IOCTest_PropertyValue {
 
	//容器创建
	AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfPropertyValues.class);
	
	//打印容器中Bean的name
	private void printBeans(AnnotationConfigApplicationContext applicationContext) {
		String[] definitionName = applicationContext.getBeanDefinitionNames();
		
		for(String name : definitionName) {
			System.out.println(name);
		}
	}
	
	@Test
	public void test01() {
		printBeans(applicationContext);
		System.out.println("-------------------------------------------------------");
		
		//获得容器中的Person
		Person person = (Person) applicationContext.getBean("person");
		System.out.println(person);
		
		//获得环境变量中的值
		ConfigurableEnvironment environment = applicationContext.getEnvironment();
		String property = environment.getProperty("person.nickName");
		System.out.println("环境变量："+property);		
		applicationContext.close();
	}	
}

test1:
     num: 1
     name: xiaoming

@Value("${test1.num}")
private int num;
@Value("${test1.name}")
private String name;

test:
  array1: aaa,bbb,ccc
  array2: 111,222,333
  array3: 11.1,22.2,33.3
  list1: ddd,eeee,111,333,222,444

//数组
@Value("${test.array1:}")
private String[] array1;
//集合
@Value("#{'${test.list1:}'.split(',')}")
private List<String> list1;
//集合进一步做空数据处理
@Value("#{'${test.list:}'.empty ? null : '${test.list:}'.split(',')}")
private List<String> testList;

test:
  map1: '{"name": "zhangsan", "sex": "male"}'
  map2: '{"math": "90", "english": "85"}'

@Value("#{${test.map2}}")
private Map<String,String> map1;
@Value("#{${test.map2}}")
private Map<String,Integer> map2;