This example presents the basic concept of using in Spring the Annotation based configuration.

The technologies used are :
– Spring 4.3.4
– JDK 1.8
– Maven 3.3.9

You can convert this example to an Eclipse IDE project by going to folder where is the pom.xml is, and use the command :

mvn eclipse:eclipse

package javaspringexamples.spring.ioc.configuration.annotation;

/**
 * 
 * @author mounir.sahrani@gmail.com
 *
 */
public class User {

	private int id;
	private String fisrtName;
	private String lastName;
	private boolean Accountlocked;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getFisrtName() {
		return fisrtName;
	}

	public void setFisrtName(String fisrtName) {
		this.fisrtName = fisrtName;
	}

	public String getLastName() {
		return lastName;
	}

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

	public boolean isAccountlocked() {
		return Accountlocked;
	}

	public void setAccountlocked(boolean accountlocked) {
		Accountlocked = accountlocked;
	}
}

package javaspringexamples.spring.ioc.configuration.annotation;

/**
 * 
 * @author mounir.sahrani@gmail.com
 *
 */
public interface UserDao {

	User find(int userId);

	void insert(User user);

	void update(User user);

	void delete(int userId);

	void lockAccount(int userId, boolean locked);

}

package javaspringexamples.spring.ioc.configuration.annotation;

import java.util.HashMap;
import java.util.Map;

import org.springframework.stereotype.Repository;

/**
 * 
 * @author mounir.sahrani@gmail.com
 *
 */

@Repository
public class UserDaoInMemoryImpl implements UserDao {

	private Map<Integer, User> usersMap = new HashMap<>();

	{
		User user1 = new User();
		user1.setId(1);
		user1.setFisrtName("FirstName 1");
		user1.setLastName("LastName 1");
		user1.setAccountlocked(false);

		User user2 = new User();
		user2.setId(2);
		user2.setFisrtName("FirstName 2");
		user2.setLastName("LastName 2");
		user2.setAccountlocked(false);

		usersMap.put(user1.getId(), user1);
		usersMap.put(user2.getId(), user2);

	}

	@Override
	public void insert(User user) {
		usersMap.put(user.getId(), user);
	}

	@Override
	public void update(User user) {
		usersMap.put(user.getId(), user);
	}

	@Override
	public void delete(int userId) {
		usersMap.remove(userId);
	}

	@Override
	public User find(int userId) {
		return usersMap.get(userId);
	}

	@Override
	public void lockAccount(int userId, boolean locked) {
		User user = usersMap.get(userId);
		user.setAccountlocked(locked);
		update(user);
	}
}

package javaspringexamples.spring.ioc.configuration.annotation;

/**
 * 
 * @author mounir.sahrani@gmail.com
 *
 */
public interface UserService {

	String getUserinformation(int userId);

	void lockAccountUser(int userId);

	void unlockAccountUser(int userId);
}

package javaspringexamples.spring.ioc.configuration.annotation;

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

/**
 * 
 * @author mounir.sahrani@gmail.com
 *
 */

@Service
public class UserServiceImpl implements UserService {
	private UserDao userDao;

	@Autowired
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

	@Override
	public void lockAccountUser(int userId) {
		userDao.lockAccount(userId, true);
	}

	@Override
	public void unlockAccountUser(int userId) {
		userDao.lockAccount(userId, false);
	}

	@Override
	public String getUserinformation(int userId) {
		User user = userDao.find(userId);
		return user.getFisrtName() + " - " + user.getLastName() + " - " + user.isAccountlocked();
	}
}

<?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-4.0.xsd">

	<context:component-scan base-package="javaspringexamples.spring.ioc.configuration.annotation"/>

</beans>

package javaspringexamples.spring.ioc.configuration.annotation;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * 
 * @author mounir.sahrani@gmail.com
 *
 */
public class Main {

	public static void main(String[] args) {
		ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(
				"/javaspringexamples/spring/ioc/configuration/annotation/configuration.xml");
		UserService userService = applicationContext.getBean(UserService.class);

		System.out.println("User1 Informations: " + userService.getUserinformation(1));
		System.out.println("User2 Informations: " + userService.getUserinformation(2));

		System.out.println("Locking User1 account");
		userService.lockAccountUser(1);
		System.out.println("User1 Informations: " + userService.getUserinformation(1));
	}

}

Get the sources of the example from the following GitHub url

Or Download a .zip file