spring (four): spring in a bean property assignment

spring in a bean property assignment

• xml file properties tab settings

  <bean id="student" class="com.enjoy.study.cap10.Student" >
          <property name="id" value="18"/>
          <property name="name" value="wxf"/>
  </bean>

• annotation
  • @Autowired
  • @Value
  • @Resource

This chapter focuses on the use of blog comment assignment

@Autowired

@Value

@Configuration
public class CapMainConfig {
    @Bean
    public Student student(){
        return new Student();
    }
}

---

public class TestCap {
    @Test
    public void testMethod(){
        ApplicationContext context = new AnnotationConfigApplicationContext(CapMainConfig.class);
        Student student = (Student) context.getBean("student");
        System.out.println("student = " + student);
    }
}

Character form @Value ( "")

public class Student {
    @Value("12")
    private Integer id;
    @Value("wxf")
    private String name;

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

result

student = Student{id=12, name='wxf'}

Expressions @Value ( "$ {}"), @ Value ( "# {}")

By @Value ( "$ {}") can obtain the corresponding attribute value defined in the file attribute

@Value ( "# {}") represents SpEl is generally used for obtaining the bean property, or call a method of the bean