@Value注解和@PropertySource 注解的使用说明

/**
 *
 * @PropertySource 这个注解会把 文件里面的k,v 放到环境变量中也即是  Environment
 *  <context:property-placeholder location="classpath:/person.properties"></context:property-placeholder>
 *
 *
 */

@PropertySource(value = {"classpath:/person.properties"})
@Configuration
public class MyUserConfig {


    @Bean
    public User getUer(){
        return new User();
    }
}

public class User {

    @Value("${user.name1}")
    private String name;

    @Value("31")
    private int age;

    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 "User{" +
                "name=‘" + name + ‘\‘‘ +
                ", age=" + age +
                ‘}‘;
    }
}



@Controller
public class Mycontroller {


    @Autowired
    Environment environment;


    @RequestMapping("/h1")
    public String hello(){

        System.out.println("evnvironment 中的 user.name is "+environment.getProperty("user.name1"));


        return "hello";
    }
}