Java Framework Spring Boot learning Note (ix): Injecting object Type properties

Injecting object properties using the Set method

Writing Userdao.java files

1  Package com.example.spring; 2 3  Public class Userdao {4      Public void print () {5         System.out.println ("Dao print.") ); 6     }7 }

Writing Userservice.java files

1  Packagecom.example.spring;2 3  Public classUserService {4     //1. Defining DAO Type Properties5     PrivateUserdao Userdao;6     //2. Generate Set Method7      Public voidSetuserdao (Userdao Userdao) {8          This. Userdao =Userdao;9     }Ten  One      Public voidprint () { ASystem.out.println ("Service print.")); -         //if you want to invoke the method inside DAO in the service without using Spring object property injection, you must first new DAO object -         //Userdao dao = new Userdao (); the         //dao.print (); - userdao.print (); -     } -}

Writing beans.xml files

1 <?XML version= "1.0" encoding= "UTF-8"?>2 <Beansxmlns= "Http://www.springframework.org/schema/beans"3 Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"4 xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd ">5 6     <BeanID= "Userdao"class= "Com.example.spring.UserDao"></Bean>7 8     <BeanID= "UserService"class= "Com.example.spring.UserService" >9         < Propertyname= "Userdao"ref= "Userdao"></ Property>Ten     </Bean> One </Beans>

Note the injected property is the ID of the Userdao class.

Writing Application.java

1  Packagecom.example.spring;2 3 ImportOrg.springframework.context.support.AbstractApplicationContext;4 ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;5 6  Public classApplication {7      Public Static voidMain (string[] args) {8         //Where the bean configuration file is located d:\\ideaprojects\\spring\\src\\beans.xml9         //using the Abstractapplicationcontext containerTenAbstractapplicationcontext context =NewClasspathxmlapplicationcontext ("File:d:\\ideaprojects\\spring\\src\\beans.xml"); One         //get configuration-created objects AUserService UserService = (userservice) context.getbean ("UserService"); - userservice.print (); -     } the}

Run output

Service Print. Dao Print.

Java Framework Spring Boot learning Note (ix): Injecting object Type properties