Spring: @Autowired injecting collection of beans

By using @Autowired annotation, you can inject collection of beans.

Example

public class Authors {

 @Autowired
 private List<Author> authors;

}

All the beans of type Author from configuration file are added to myConfiguration.xml.

Following is the complete working application.

Author.java

package com.sample.pojo;

public class Author {
 private String firstName;
 private String lastName;
 private String dateOfBirth;
 private String country;

 public String getFirstName() {
  return firstName;
 }

 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public String getLastName() {
  return lastName;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

 public String getDateOfBirth() {
  return dateOfBirth;
 }

 public void setDateOfBirth(String dateOfBirth) {
  this.dateOfBirth = dateOfBirth;
 }

 public String getCountry() {
  return country;
 }

 public void setCountry(String country) {
  this.country = country;
 }

 @Override
 public String toString() {
  StringBuilder builder = new StringBuilder();
  builder.append("Author [firstName=").append(firstName).append(", lastName=").append(lastName)
    .append(", dateOfBirth=").append(dateOfBirth).append(", country=").append(country).append("]");
  return builder.toString();
 }

}

Authors.java

package com.sample.pojo;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

public class Authors {

 @Autowired
 private List<Author> authors;

 public List<Author> getAuthors() {
  return authors;
 }

 public void printAuthors() {
  for (Author author : authors) {
   System.out.println(author);
  }
 }
}

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

 <context:annotation-config />

 <bean id="osho" class="com.sample.pojo.Author">
  <property name="firstName" value="Chandra Mohan" />
  <property name="lastName" value="Jain" />
  <property name="dateOfBirth" value="11 December 1931" />
  <property name="country" value="India" />
 </bean>

 <bean id="krishna" class="com.sample.pojo.Author">
  <property name="firstName" value="hari krishna" />
  <property name="lastName" value="Gurram" />
  <property name="dateOfBirth" value="05 may 1989" />
  <property name="country" value="India" />
 </bean>

 <bean id="Kiran" class="com.sample.pojo.Author">
  <property name="firstName" value="Kira" />
  <property name="lastName" value="Kumnoor" />
  <property name="dateOfBirth" value="25 August 1990" />
  <property name="country" value="India" />
 </bean>

 <bean id="authors" class="com.sample.pojo.Authors" />


</beans>

HelloWorld.java

package com.sample.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.sample.pojo.Author;
import com.sample.pojo.Authors;

public class HelloWorld {
 public static void main(String args[]) {
  ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "myConfiguration.xml" });

  Authors authors = context.getBean("authors", Authors.class);

  for (Author author : authors.getAuthors()) {
   System.out.println(author);
  }

  ((ClassPathXmlApplicationContext) context).close();
 }
}

Output

Author [firstName=Chandra Mohan, lastName=Jain, dateOfBirth=11 December 1931, country=India]
Author [firstName=hari krishna, lastName=Gurram, dateOfBirth=05 may 1989, country=India]
Author [firstName=Kira, lastName=Kumnoor, dateOfBirth=25 August 1990, country=India]

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