IT Education Guidance

Setter Injection With Dependent Object And Collection Example

Dependency Injection By Setter method

Can inject the dependency by setter method also.

The <property> sub-element of <bean> is used for setter injection.

<bean id="studentBean" class="com.Student">

<property name="fName"><value>Sanjeeva</value></property>

<property name="lName"><value>Pathirana</value></property>

</bean>

Setter Injection with Dependent object

For this injection we can use for HAS-A relationship occurrences.

E.g. Student HAS-A Academic Year

...

</bean>

...

</bean>

Setter Injection with Collection Example

Can inject collection values by using setter method.

There are 3 elements which use with <property> element.

1. list

<list>

<value>Annual Debt</value>

<value>Rugby Tournament</value>

</list>

</property>

<property name="gradeLevel"><value>1st Class</value></property>

</bean>

<list>

<ref bean="grade1Bean"/>

</list>

2. map

<property name="semesterInfoMap">

<map>

</map>

</property>

<map>

</map>

</property>

Find the example below.

Steps as follows:

Create Student.java, Subject.java, Grade.java, Lecturer.java, AcademicInfo.java classes
Create ApplicationContext.xml
Create executable class called DisplayStudentInfo.java

1. Create Student.java, Subject.java, Grade.java, Lecturer.java, AcademicInfo.java classes

package com;

import java.io.Serializable;

public class Subject implements Serializable {

/**

private static final long serialVersionUID = 1L;

private String subjectCode;

private String subject;

public String displaySubject(){

return "\tSubject Code : " + subjectCode + "\tSubject : " + subject;

}

public String getSubjectCode() {

return subjectCode;

}

public void setSubjectCode(String subjectCode) {

this.subjectCode = subjectCode;

}

public String getSubject() {

return subject;

}

public void setSubject(String subject) {

this.subject = subject;

}

package com;

import java.io.Serializable;

public class Lecturer implements Serializable {

/**

private static final long serialVersionUID = 1L;

private String lectureInCharge;

private String lectureEmail;

public String lectureInfo(){

return "\tLecture In Charge : " + lectureInCharge + "\te-mail :" + lectureEmail;

}

public String getLectureInCharge() {

return lectureInCharge;

}

public void setLectureInCharge(String lectureInCharge) {

this.lectureInCharge = lectureInCharge;

}

public String getLectureEmail() {

return lectureEmail;

}

public void setLectureEmail(String lectureEmail) {

this.lectureEmail = lectureEmail;

}

package com;

import java.io.Serializable;

public class AcademicInfo implements Serializable {

/**

private static final long serialVersionUID = 1L;

private String studentYear;

private int noOfSemisters;

private int noOfCompulsorySubject;

private int noOfOptionalSubject;

public String displayAcademicInfo(){

return "\n\tStudent Year : " + studentYear + "\n\tNo. of Semesters : " + noOfSemisters + "\n\tCompulsory Subjects : " + noOfCompulsorySubject + "\n\tOptional Subjects : " + noOfOptionalSubject;

}

public String getStudentYear() {

return studentYear;

}

public void setStudentYear(String studentYear) {

this.studentYear = studentYear;

}

public int getNoOfSemisters() {

return noOfSemisters;

}

public void setNoOfSemisters(int noOfSemisters) {

this.noOfSemisters = noOfSemisters;

}

public int getNoOfCompulsorySubject() {

return noOfCompulsorySubject;

}

public void setNoOfCompulsorySubject(int noOfCompulsorySubject) {

this.noOfCompulsorySubject = noOfCompulsorySubject;

}

public int getNoOfOptionalSubject() {

return noOfOptionalSubject;

}

public void setNoOfOptionalSubject(int noOfOptionalSubject) {

this.noOfOptionalSubject = noOfOptionalSubject;

}

package com;

import java.io.Serializable;

public class Grade implements Serializable {

/**

private static final long serialVersionUID = 1L;

private String gradeLevel;

private String gradeDescription;

public String getGradeLevel() {

return gradeLevel;

}

public void setGradeLevel(String gradeLevel) {

this.gradeLevel = gradeLevel;

}

public String getGradeDescription() {

return gradeDescription;

}

public void setGradeDescription(String gradeDescription) {

this.gradeDescription = gradeDescription;

}

public String displayGrades(){

return "\tLevel : " + gradeLevel + "\n\tDescription : " + gradeDescription + "\n";

}

package com;

import java.io.Serializable;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

public class Student implements Serializable {

/**

private static final long serialVersionUID = 1L;

private String studentRef;

private String fName;

private String lName;

private int age;

private AcademicInfo academicInfo;

private List<String> extraCurriculumList;

private List<Grade> gradeList;

private Map<String, String> semesterInfoMap;

private Map<Subject, Lecturer> subjectInfoMap;

public void displayStudentDetails(){

System.out.println("Student Ref\t:\t"+studentRef);

System.out.println("fName\t\t:\t"+fName);

System.out.println("lName\t\t:\t"+lName);

System.out.println("age\t\t:\t"+age);

System.out.println("\nAcademis Info.\t:\t"+academicInfo.displayAcademicInfo());

System.out.println("\nSemester Information : ");

Set<Entry<String, String>> setSI = semesterInfoMap.entrySet();

Iterator<Entry<String, String>> itrSI = setSI.iterator();

while(itrSI.hasNext()){

System.out.println("\t" + itrSI.next().getKey() + " " + itrSI.next().getValue() );

}

System.out.println("\nSemester Information : ");

Set<Entry<Subject, Lecturer>> setSub = subjectInfoMap.entrySet();

Iterator<Entry<Subject, Lecturer>> subSI = setSub.iterator();

while(subSI.hasNext()){

Entry<Subject, Lecturer> entry = subSI.next();

Subject subject = entry.getKey();

Lecturer lecturer = entry.getValue();

System.out.println(".\t" + subject.displaySubject() + " " + lecturer.lectureInfo() );

}

System.out.println("\nGrades : ");

Iterator<Grade> itrGrades = gradeList.iterator();

while(itrGrades.hasNext()){ System.out.println(itrGrades.next().displayGrades());

}

System.out.println("\nExtra Curricular Activities");

Iterator<String> itrExCur = extraCurriculumList.iterator();

while(itrExCur.hasNext()){

System.out.println("\t* " + itrExCur.next());

}

public String getStudentRef() {

return studentRef;

}

public void setStudentRef(String studentRef) {

this.studentRef = studentRef;

}

public String getfName() {

return fName;

}

public void setfName(String fName) {

this.fName = fName;

}

public String getlName() {

return lName;

}

public void setlName(String lName) {

this.lName = lName;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public AcademicInfo getAcademicInfo() {

return academicInfo;

}

public void setAcademicInfo(AcademicInfo academicInfo) {

this.academicInfo = academicInfo;

}

public List<String> getExtraCurriculumList() {

return extraCurriculumList;

}

public void setExtraCurriculumList(List<String> extraCurriculumList) {

this.extraCurriculumList = extraCurriculumList;

}

public List<Grade> getGradeList() {

return gradeList;

}

public void setGradeList(List<Grade> gradeList) {

this.gradeList = gradeList;

}

public Map<String, String> getSemesterInfoMap() {

return semesterInfoMap;

}

public void setSemesterInfoMap(Map<String, String> semesterInfoMap) {

this.semesterInfoMap = semesterInfoMap;

}

public Map<Subject, Lecturer> getSubjectInfoMap() {

return subjectInfoMap;

}

public void setSubjectInfoMap(Map<Subject, Lecturer> subjectInfoMap) {

this.subjectInfoMap = subjectInfoMap;

}

2. Create ApplicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<property name="fName"><value>Sanjeeva</value></property>

<property name="lName"><value>Pathirana</value></property>

<list>

<value>Annual Debt</value>

<value>Rugby Tournament</value>

<value>Poem competition</value>

</list>

</property>

<list>

</list>

</property>

<map>

</map>

</property>

<map>

</map>

</property>

</bean>

</bean>

<property name="gradeLevel"><value>1st Class</value></property>

</bean>

<property name="gradeLevel"><value>2nd Upper</value></property>

</bean>

</bean>

</bean>

</bean>

</bean>

</beans>

3. Create DisplayAuthorInformation.java

package com;

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 DisplayStudentInfo {

/**

* @p aram args

public static void main(String[] args) {

DisplayStudentInfo studentInfo = new DisplayStudentInfo();

studentInfo.doExecute();

}

private void doExecute(){

Resource resource = new ClassPathResource("resource/ApplicationContext.xml");

BeanFactory beanFactory = new XmlBeanFactory(resource);

Student student = (Student)beanFactory.getBean("studentBean");

student.displayStudentDetails();

}

Out put as follows:

Student Ref : STD001

fName : Sanjeeva

lName : Pathirana

age : 30

Academis Info. :

Student Year : 2nd Year

No. of Semesters : 2

Compulsory Subjects : 8

Optional Subjects : 4

Semester Information :

1st Semester - Starts Apr 2014

2nd Semester - Starts Oct 2014

Semester Information :

. Subject Code : SUB0001 Subject : Software Engineering Lecture In Charge : Thinuli Pathirana e-mail :thinuli@gmail.com

. Subject Code : SUB0002 Subject : Network Engineering Lecture In Charge : Sandamali Silva e-mail :sandamali@gmail.com

Grades :

Level : 1st Class

Description : Over 3.5 GPA

Level : 2nd Upper

Description : Over 3.0 GPA

Extra Curricular Activities

* Annual Debt

* Rugby Tournament

* Poem competition

IT Education Guidance - Spring

Pages

Monday, August 26, 2013

Setter Injection With Dependent Object And Collection Example