Spring中如何使用@Value注解实现给Bean属性赋值

@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Value {
 /**
  * The actual value expression: for example {@code #{systemProperties.myProp}}.
  */
 String value();
}

public class Teacher {
 public int id;
 public String name;
 
 public Teacher() {
  // TODO Auto-generated constructor stub
  System.out.println("teacher-----创建");
 }
 
 
 public Teacher(int id, String name) {
  super();
  this.id = id;
  this.name = name;
 } 
//省略getter和setter方法
}

public class Student{
 
 @Value("1")
 private int id;
 @Value("${student.name}")
 private String name;
 @Value("${student.address:北京}")
 private String address;
 @Value("#{teacher.name?:'老子'}")
 private String teacherName;
 @Override
 public String toString() {
  return "Student [id=" + id + ", name=" + name + ", address=" + address + ", teacherName=" + teacherName + "]";
 }
//省略getter和setter方法
}

student.name=张三
person.address=广州市

@Configuration
@PropertySource("person.properties")
public class SpringConfig2 { 
    @Bean
 public Student student() {
  return new Student();  
 }
    @Bean
 public Teacher teacher() {
  return new Teacher(2,"老李");
 }
}

public class IoCTest {
 @Test
 public void test() {
  //获取Spring的IOC容器
  AnnotationConfigApplicationContext applicationContext=new AnnotationConfigApplicationContext(SpringConfig2.class);
  //从容器中获取bean
       Student stu = (Student) applicationContext.getBean("student");
       System.out.println(stu);   
     //获取环境变量
  ConfigurableEnvironment environment = applicationContext.getEnvironment();
  String property = environment.getProperty("person.address");
  System.out.println(property);
  //关闭容器
  applicationContext.close();
 }
}