Wednesday, 18 April 2018

Spring DI with Object Using CI

We will see below how to inject dependency object through the Constructor Injection.

package com.bk.spring.test;

public class CourseBean {

    private String name;
    private String duration;
    private Double fee;

   public CourseBean(String name, String duration, Double fee){
        this.name = name;
        this.duration = duration;
        this.fee = fee;
    }
   
    public String getCourseDetails(){
        return "Course " + name + " has " + duration + " duration with fee " + fee;
    }

}


package com.bk.spring.test;

public class StudentBean {

    private int id;
    private String name;
    private String emailId;
    private CourseBean courseBean;
    private double fee;

    StudentBean() {
        System.out.println("default constructor");
    }

    StudentBean(String name) {
        this.name = name;
    }
   
    StudentBean(int id) {
        this.id = id;
    }

    StudentBean(int id, String name, String emailId, CourseBean courseBean, double fee) {
        this.id = id;
        this.name = name;
        this.emailId = emailId;
        this.courseBean = courseBean;
        this.fee = fee;
    }

    public void getStudentDetails() {
        System.out.println("Id is " + this.id + " \n name is " + name
                + " \n email id is " + emailId +  "\n" + courseBean.getCourseDetails());
    }

}


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
    <bean name="student" class="com.bk.spring.test.StudentBean">
        <constructor-arg value="001" />
        <constructor-arg value="krishna" />
        <constructor-arg value="Krishna@abc.com" />
        <constructor-arg>
        <ref bean="courseBean"/>
        </constructor-arg>
        <constructor-arg value="2018" />
    </bean>
    <bean name="courseBean" class="com.bk.spring.test.CourseBean">
        <constructor-arg value="Java"/>
        <constructor-arg value="90 Days"/>
        <constructor-arg value="2018"/>
    </bean>
  </beans>

package com.bk.spring.test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

public class SpringConDITest {

    public static void main(String a[]) {

        Resource res = new ClassPathResource("applicationContext.xml");
        BeanFactory factory = new XmlBeanFactory(res);
        StudentBean bean = (StudentBean) factory.getBean("student");
        bean.getStudentDetails();
          }

}

Output :
Id is 1
 name is krishna
 email id is Krishna@abc.com
Course Java has 90Days duration with fee 2018.0

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