Spring Rest Service CRUD operations with XML

package com.kb.rest.model;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="User")
@XmlAccessorType(XmlAccessType.FIELD)
public class User {
	@XmlElement
	private String name;
	@XmlElement
	private int age;
	@XmlElement
	private int id;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
}

package com.kb.rest.model;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="UserList")
@XmlAccessorType(XmlAccessType.FIELD)
public class UserList {
	
	@XmlElement(name="User")
	private List<User> userList;

	public List<User> getUserList() {
		return userList;
	}

	public void setUserList(List<User> userList) {
		this.userList = userList;
	}

}

package com.kb.rest.controllers;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.kb.rest.model.User;
import com.kb.rest.model.UserList;
import com.kb.rest.service.UserService;

@Controller
@RequestMapping("/user")
public class RestController {

	@Autowired
	private UserService userService;
	
	// CRUD -- CREATE operation
	@RequestMapping(value = "/create", method = RequestMethod.POST)
	public @ResponseBody User createUser(@RequestBody User user) {
		User userResponse = userService.createUser(user);
		return userResponse;
	}

	// CRUD -- READ operation
	@RequestMapping(value = "/getAllUsers", method = RequestMethod.GET)
	public @ResponseBody UserList getAllUsers() {
		List<User> userList = userService.getAllUsers();
		UserList userListCustom = new UserList();
		userListCustom.setUserList(userList);
		return userListCustom;
	}

	// CRUD -- READ operation
	@RequestMapping(value = "/getSpecificUser/{id}", method = RequestMethod.GET)
	public @ResponseBody User getUserForId(@PathVariable ("id") int id) {
		User user = userService.getUserForId(id);
		return user;
	}

	// CRUD -- UPDATE operation
	@RequestMapping(value = "/updateUser", method = RequestMethod.PUT)
	public @ResponseBody User updateUser(@RequestBody User user) {
		User userResponse = userService.updateUser(user);
		return userResponse;
	}

	// CRUD -- DELETE operation
	@RequestMapping(value = "/deleteUser/{id}", method = RequestMethod.DELETE)
	public @ResponseBody User deleteeUser(@PathVariable("id") int id) {
		User userResponse = userService.deleteUser(id);
		return userResponse;
	}
}

package com.kb.rest.service;

import java.util.List;

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

import com.kb.rest.dao.UserDAO;
import com.kb.rest.model.User;

@Service
public class UserService {
	
	@Autowired
	private UserDAO userDao;

	public List<User> getAllUsers() {
		List<User> userList = userDao.getAllUsers();
		return userList;
	}

	public User getUserForId(int id) {
		User user = userDao.getUserForId(id);
		return user;
	}

	public User createUser(User user) {
		User userResponse = userDao.createUser(user);
		return userResponse;
	}

	public User updateUser(User user) {
		User userResponse = userDao.updateUser(user);
		return userResponse;
	}

	public User deleteUser(int id) {
		User userResponse = userDao.deleteUser(id);
		return userResponse;
	}

}

package com.kb.rest.dao;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.springframework.stereotype.Repository;

import com.kb.rest.model.User;

//Just to avoid DB calls in this example, Assume below data is interacting with DB

@Repository
public class UserDAO {
	static HashMap<Integer, User> usersMap = new HashMap<Integer, User>();

	public UserDAO() {
			User user1 = new User();
			user1.setId(1);
			user1.setAge(20);
			user1.setName("raj");
			
			User user2 = new User();
			user2.setId(2);
			user2.setAge(21);
			user2.setName("ram");
			
			usersMap.put(1, user1);
			usersMap.put(2, user2);
	}

	public List<User> getAllUsers() {

		List<User> userList = new ArrayList<User>(usersMap.values());
		return userList;
	}

	public User getUserForId(int id) {
		User user = usersMap.get(id);
		return user;
	}

	public User createUser(User user) {
		usersMap.put(user.getId(), user);
		return usersMap.get(user.getId());
	}

	public User updateUser(User user) {
		if (usersMap.get(user.getId()) != null) {
			usersMap.get(user.getId()).setName(user.getName());
		} else {
			usersMap.put(user.getId(), user);
		}
		return usersMap.get(user.getId());
	}

	public User deleteUser(int id) {
		User userResponse = usersMap.remove(id);
		return userResponse;
	}

}

<User>
<name>John</name>
 <age>45</age>
 <id>3</id>
 </User>

<User>
<name>John</name>
 <age>45</age>
 <id>1</id>
 </User>