@Value注解和@PropertySource 和@ImportResource 注解的使用说明

1、作用和说明

• @Value 相当于原来配置文件中的 value属性  <property name="age" value="20"/>
• @PropertySource 相当于原来配置文件中的  <context:property-placeholder location="classpath:/person.properties"></context:property-placeholder> 这个标签，把属性 会放到环境变量中 Environment,作用于.properties 文件
• @ImportResource 他针对的是我们自定义的.xml文件

2、代码说明

@Configuration
@PropertySource(value = {"classpath:config/user.properties"})
@ImportResource(value={"classpath:config/bean.xml"})
public class MyUserConfig {


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



}


@RestController
public class UserController {

    @Resource
    User user;

    @Resource
    PersonService personService;

    @GetMapping("/h2")
    public String test() {
        personService.print();
     return user.getUsername();
    }

}



public class User {

    @Value("${user.name2}")
    private String username;

    private int    age;

    private String userId;

    public User() {
    }

    public User(String username, int age, String userId) {
        this.username = username;
        this.age = age;
        this.userId = userId;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }
}