Spring annotation-driven ninth speak - property assignment

In using annotations Spring development only, it can be annotated using @Value and @PropertySource be assigned to the properties of the object.

1, create a simple entity class

public  class the Person {
     / ** 
     * values @Value annotation may have the following 
     * 1, the value is written directly in the properties among Value (String, int, boolean .....), for example, the name attribute 
     * 2, write } # {i.e., expression spEL form, e.g. age property 
     * 3, in the main configuration file by loading the configuration class @PropertySource annotation, then take the value in the configuration file in the form of $ {} 
     * / 
    @Value ( "John Doe " )
     Private String name; 
    @Value ( " # {31-9} " )
     Private  int Age; 
    @Value ( " person.nikname $ {} " )
     Private String nikname; 
    
    public String getNikname () {
         return nikname; 
    } 
    public  void setNikname(String nikname) {
        this.nikname = nikname;
    }
    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;
    }
    public Person(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public Person() {
        super();
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", nikname=" + nikname + "]";
    }
    
}

2, add a profile person.properties in the class directory

Zhang person.nikname =

3, create a test class

　　@Test
    public void test6() {
        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainPropertiesConfig.class);
        Object object = applicationContext.getBean("person") ;
        System.out.println(object);
    }

operation result:

Person [name = Joe Smith, age = 22, nikname = Zhang]