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 Spring > Core > P Name Space Reference

P Name Space Reference 

Spring Inversion of Control (IoC) also known as Dependency Injection (DI) is a process by which objects define their dependencies with collaborating objects. The following example shows using P Name space reference which allows us to use the bean element's attributes, instead of nested property elements.

File Name  :  
/SpringCore001/conf/pnamespace/pns_reference.xml 
view sourceprint?
01<?xml version="1.0" encoding="UTF-8"?>
02<beans xmlns="http://www.springframework.org/schema/beans"
03        xmlns:p="http://www.springframework.org/schema/p"
04       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
05       xsi:schemaLocation="http://www.springframework.org/schema/beans
06           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
07 
08    <bean id="dept" class="com.bethecoder.tutorials.spring3.basic.Department">
09        <property name="manager" ref="emp1" />
10    </bean>
11 
12    <bean id="dept2" class="com.bethecoder.tutorials.spring3.basic.Department"
13        p:manager-ref="emp1"
14    />
15 
16    <bean id="emp1" class="com.bethecoder.tutorials.spring3.basic.Employee">
17        <property name="id" value="1" />
18        <property name="name" value="ABC" />
19        <property name="salary" value="90000" />
20    </bean>
21</beans>

File Name  :  
com/bethecoder/tutorials/spring3/basic/Employee.java 
   
package com.bethecoder.tutorials.spring3.basic;

public class Employee {
  
  private int id;
  private String name;
  private double salary;
  
  public Employee() {
    super();
    this.id = -1;
    this.name = "Unknown";
    this.salary = 0;
  }
  
  public Employee(int id, String name) {
    super();
    this.id = id;
    this.name = name;
    this.salary = 20000;
  }
  
  public Employee(int id, String name, double salary) {
    super();
    this.id = id;
    this.name = name;
    this.salary = salary;
  }

  public int getId() {
    return id;
  }
  
  public void setId(int id) {
    this.id = id;
  }
  
  public String getName() {
    return name;
  }
  
  public void setName(String name) {
    this.name = name;
  }
  
  public double getSalary() {
    return salary;
  }
  
  public void setSalary(double salary) {
    this.salary = salary;
  }
  
  public String toString() {
    return "Employee[" + id + ", " + name + ", " + salary + "]";
  }
  
}
   

File Name  :  
com/bethecoder/tutorials/spring3/basic/Department.java 
   
package com.bethecoder.tutorials.spring3.basic;

import java.util.List;

public class Department {

  private Employee manager = null;
  private List<Employee> employees = null;

  public List<Employee> getEmployees() {
    return employees;
  }

  public void setEmployees(List<Employee> employees) {
    this.employees = employees;
  }

  public Employee getManager() {
    return manager;
  }

  public void setManager(Employee manager) {
    this.manager = manager;
  }
  
}
   

File Name  :  
com/bethecoder/tutorials/spring3/tests/pnamespace/ReferenceTests.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.spring3.tests.pnamespace;

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

import com.bethecoder.tutorials.spring3.basic.Department;

public class ReferenceTests {

  /**
   * @param args
   */
  public static void main(String[] args) {
    XmlBeanFactory factory = new XmlBeanFactory(
                new ClassPathResource("pns_reference.xml"));

    Department dept = (Department) factory.getBean("dept");
    System.out.println(dept.getManager());

    Department dept2 = (Department) factory.getBean("dept2");
    System.out.println(dept2.getManager());
  }

}
   

It gives the following output, 
Employee[1, ABC, 90000.0]
Employee[1, ABC, 90000.0]



 
  


  
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