在本教程中，我們將使用基于注解的配置集成Spring和Hibernate。我們將開發(fā)包含表單要求用戶輸入一個(gè)簡單的CRUD為導(dǎo)向Web應(yīng)用程序，使用Hibernate保存輸入的數(shù)據(jù)到 MySQL 數(shù)據(jù)庫，從數(shù)據(jù)庫和更新檢索記錄或刪除它們在事務(wù)中，全部采用注解配置。

使用以下技術(shù)：

Spring 4.0.6.RELEASE
Hibernate Core 4.3.6.Final
validation-api 1.1.0.Final
hibernate-validator 5.1.3.Final
MySQL Server 5.6
Maven 3
JDK 1.7
Tomcat 8.0.21
Eclipse JUNO Service Release 2
TestNG 6.9.4
Mockito 1.10.19
DBUnit 2.2
H2 Database 1.4.187

現(xiàn)在，讓我們開始

第1步：創(chuàng)建目錄結(jié)構(gòu)

以下是最終的項(xiàng)目結(jié)構(gòu)：

現(xiàn)在讓我們來添加上每個(gè)細(xì)節(jié)上述結(jié)構(gòu)中提到的內(nèi)容。

第2步：更新 pom.xml，包括所需的依賴關(guān)系

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
	xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

	<modelVersion>4.0.0</modelVersion>
	<groupId>com.yiibai.springmvc</groupId>
	<artifactId>SpringHibernateExample</artifactId>
	<packaging>war</packaging>
	<version>1.0.0</version>
	<name>SpringHibernateExample</name>

	<properties>
		<springframework.version>4.0.6.RELEASE</springframework.version>
		<hibernate.version>4.3.6.Final</hibernate.version>
		<mysql.connector.version>5.1.31</mysql.connector.version>
		<joda-time.version>2.3</joda-time.version>
		<testng.version>6.9.4</testng.version>
		<mockito.version>1.10.19</mockito.version>
		<h2.version>1.4.187</h2.version>
		<dbunit.version>2.2</dbunit.version>
	</properties>

	<dependencies>
		<!-- Spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-tx</artifactId>
			<version>${springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>${springframework.version}</version>
		</dependency>

		<!-- Hibernate -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>${hibernate.version}</version>
		</dependency>

		<!-- jsr303 validation -->
		<dependency>
			<groupId>javax.validation</groupId>
			<artifactId>validation-api</artifactId>
			<version>1.1.0.Final</version>
		</dependency>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-validator</artifactId>
			<version>5.1.3.Final</version>
		</dependency>

		<!-- MySQL -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.connector.version}</version>
		</dependency>

      	<!-- Joda-Time -->		
		<dependency>
  			<groupId>joda-time</groupId>
  			<artifactId>joda-time</artifactId>
  			<version>${joda-time.version}</version>
  		</dependency>
		
		<!-- To map JodaTime with database type -->  		
  		<dependency>
    		<groupId>org.jadira.usertype</groupId>
    		<artifactId>usertype.core</artifactId>
    		<version>3.0.0.CR1</version>
		</dependency>

		<!-- Servlet+JSP+JSTL -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>javax.servlet.jsp-api</artifactId>
			<version>2.3.1</version>
		</dependency>
		<dependency>
		    <groupId>javax.servlet</groupId>
		    <artifactId>jstl</artifactId>
		    <version>1.2</version>
		</dependency>
		
		
		<!-- Testing dependencies -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${springframework.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.testng</groupId>
			<artifactId>testng</artifactId>
			<version>${testng.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.mockito</groupId>
			<artifactId>mockito-all</artifactId>
			<version>${mockito.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>com.h2database</groupId>
			<artifactId>h2</artifactId>
			<version>${h2.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>dbunit</groupId>
			<artifactId>dbunit</artifactId>
			<version>${dbunit.version}</version>
			<scope>test</scope>
		</dependency>
		
	</dependencies>

	<build>
		<pluginManagement>
			<plugins>
				<plugin>
					<groupId>org.apache.maven.plugins</groupId>
					<artifactId>maven-war-plugin</artifactId>
					<version>2.4</version>
					<configuration>
						<warSourceDirectory>src/main/webapp</warSourceDirectory>
						<warName>SpringHibernateExample</warName>
						<failOnMissingWebXml>false</failOnMissingWebXml>
					</configuration>
				</plugin>
			</plugins>
		</pluginManagement>
		<finalName>SpringHibernateExample</finalName>
	</build>
</project>

首先要注意這里是 maven-war-plugin 插件聲明。由于我們使用的是全注解的配置，所以不包函 web.xml 文件在項(xiàng)目中，所以我們需要配置這個(gè)插件以避免 Maven 構(gòu)建 war 包失敗。因?yàn)樵谶@個(gè)例子中，我們將用一個(gè)表單來接受來自用戶的輸入，我們也需要驗(yàn)證用戶的輸入。在這里我們將選擇JSR303驗(yàn)證，所以我們包括驗(yàn)證，API 代表了規(guī)范，hibernate-validator它代表本規(guī)范的實(shí)現(xiàn)。hibernate-validator 還提供了一些它自己的注解(@Email，@NotEmpty等)不屬于規(guī)范的一部分。

伴隨著這一點(diǎn)，我們也包括 JSP/Servlet/Jstl 依賴關(guān)系，也將需要為使用的 servlet API和JSTL視圖在代碼中。在一般情況下，容器可能已經(jīng)包含了這些庫，從而在 pom.xml 中“提供”了我們可以設(shè)置的范圍。

步驟3：配置Hibernate

com.yiibai.springmvc.configuration.HibernateConfiguration

package com.yiibai.springmvc.configuration;

import java.util.Properties;

import javax.sql.DataSource;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate4.HibernateTransactionManager;
import org.springframework.orm.hibernate4.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@ComponentScan({ "com.yiibai.springmvc.configuration" })
@PropertySource(value = { "classpath:application.properties" })
public class HibernateConfiguration {

    @Autowired
    private Environment environment;

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan(new String[] { "com.yiibai.springmvc.model" });
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
     }
	
    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
        dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
        dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
        dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
        return dataSource;
    }
    
    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        return properties;        
    }
    
	@Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory s) {
       HibernateTransactionManager txManager = new HibernateTransactionManager();
       txManager.setSessionFactory(s);
       return txManager;
    }
}

@Configuration表示該類包含注解為 @Bean生產(chǎn)Bean管理是由Spring容器的一個(gè)或多個(gè)bean的方法。在我們的例子中，這個(gè)類代表hibernate配置。

@ComponentScan 相當(dāng)于 context:component-scan base-package="..." 在xml文件中配置, 提供Spring在哪里尋找管理 beans/classes。

@EnableTransactionManagement 相當(dāng)于 Spring’s tx:* XML 命名空間, 使Spring注解驅(qū)動事務(wù)管理能力。

@PropertySource 用于聲明一組屬性(在屬性中定義的應(yīng)用程序類路徑文件)在Spring運(yùn)行時(shí) Environment, 提供了靈活性，可以在不同的應(yīng)用環(huán)境的不同值。

下面是這篇文章中使用的屬性文件。

/src/main/resources/application.properties

jdbc.driverClassName = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql://localhost:3306/yiibai
jdbc.username = root
jdbc.password = passwd123
hibernate.dialect = org.hibernate.dialect.MySQLDialect
hibernate.show_sql = true
hibernate.format_sql = true

第4步：配置Spring MVC

com.yiibai.springmvc.configuration.AppConfig

package com.yiibai.springmvc.configuration;

import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.yiibai.springmvc")
public class AppConfig {
	
	@Bean
	public ViewResolver viewResolver() {
		InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
		viewResolver.setViewClass(JstlView.class);
		viewResolver.setPrefix("/WEB-INF/views/");
		viewResolver.setSuffix(".jsp");
		return viewResolver;
	}
	
	@Bean
	public MessageSource messageSource() {
	    ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
	    messageSource.setBasename("messages");
	    return messageSource;
	}
}

同樣，@Configuration標(biāo)志著這一類配置類如上所述與器件掃描是指包位置找到相關(guān)的Bean類。

@EnableWebMvc相當(dāng)于mvc:annotation-driven 在XML文件中。

ViewResolver方法配置一個(gè)ViewResolver來找出真正的視圖。

在這篇文章中，我們提交表單并驗(yàn)證用戶輸入(通過JSR303注解)。在校驗(yàn)失敗后，默認(rèn)的錯(cuò)誤消息會顯示。要通過自己的自定義覆蓋默認(rèn)的[國際化]從外部消息包的消息[.properties文件]，我們需要配置一個(gè)ResourceBundleMessageSource。messageSource方法有同樣的目的。請注意，以basename方法提供的參數(shù)(消息)。Spring將搜索應(yīng)用程序類路徑中一個(gè)名為 messages.properties 的文件。讓我們添加的文件：

/src/main/resources/messages.properties

Size.employee.name=Name must be between {2} and {1} characters long
NotNull.employee.joiningDate=Joining Date can not be blank
NotNull.employee.salary=Salary can not be blank
Digits.employee.salary=Only numeric data with max 8 digits and with max 2 precision is allowed
NotEmpty.employee.ssn=SSN can not be blank
typeMismatch=Invalid format
non.unique.ssn=SSN {0} already exist. Please fill in different value.

請注意，上述消息按照特定的模式：

{ValidationAnnotationClass}.{modelObject}.{fieldName}

此外，根據(jù)具體注解(如@Size)，你也可以用傳遞參數(shù)給這些消息{0},{1},..{i}索引。

步驟5：配置初始化器類

com.yiibai.springmvc.configuration.AppInitializer

package com.yiibai.springmvc.configuration;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class AppInitializer implements WebApplicationInitializer {

	public void onStartup(ServletContext container) throws ServletException {

		AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
		ctx.register(AppConfig.class);
		ctx.setServletContext(container);

		ServletRegistration.Dynamic servlet = container.addServlet(
				"dispatcher", new DispatcherServlet(ctx));

		servlet.setLoadOnStartup(1);
		servlet.addMapping("/");
	}

}

上面的內(nèi)容類似于web.xml，因?yàn)槲覀兪褂玫氖乔岸丝刂破?nbsp;DispatcherServlet 的內(nèi)容，分配映射(URL模式的XML)，而不是提供給Spring配置文件(spring-servlet.xml)的路徑，在這里我們正在注冊的配置類。

更新：請注意，上面的類可以寫成更加簡潔[最佳方法]，通過擴(kuò)展 AbstractAnnotationConfigDispatcherServletInitializer 基類，如下所示：

package com.yiibai.springmvc.configuration;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

	@Override
	protected Class<?>[] getRootConfigClasses() {
		return new Class[] { AppConfig.class };
	}
 
	@Override
	protected Class<?>[] getServletConfigClasses() {
		return null;
	}
 
	@Override
	protected String[] getServletMappings() {
		return new String[] { "/" };
	}

}

第6步：添加控制器來處理請求

添加控制器這將有助于處理 GET和POST請求。

com.yiibai.springmvc.controller.AppController

package com.yiibai.springmvc.controller;

import java.util.List;
import java.util.Locale;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.yiibai.springmvc.model.Employee;
import com.yiibai.springmvc.service.EmployeeService;

@Controller
@RequestMapping("/")
public class AppController {

	@Autowired
	EmployeeService service;
	
	@Autowired
	MessageSource messageSource;

	/*
	 * This method will list all existing employees.
	 */
	@RequestMapping(value = { "/", "/list" }, method = RequestMethod.GET)
	public String listEmployees(ModelMap model) {

		List<Employee> employees = service.findAllEmployees();
		model.addAttribute("employees", employees);
		return "allemployees";
	}

	/*
	 * This method will provide the medium to add a new employee.
	 */
	@RequestMapping(value = { "/new" }, method = RequestMethod.GET)
	public String newEmployee(ModelMap model) {
		Employee employee = new Employee();
		model.addAttribute("employee", employee);
		model.addAttribute("edit", false);
		return "registration";
	}

	/*
	 * This method will be called on form submission, handling POST request for
	 * saving employee in database. It also validates the user input
	 */
	@RequestMapping(value = { "/new" }, method = RequestMethod.POST)
	public String saveEmployee(@Valid Employee employee, BindingResult result,
			ModelMap model) {

		if (result.hasErrors()) {
			return "registration";
		}

		/*
		 * Preferred way to achieve uniqueness of field [ssn] should be implementing custom @Unique annotation 
		 * and applying it on field [ssn] of Model class [Employee].
		 * 
		 * Below mentioned peace of code [if block] is to demonstrate that you can fill custom errors outside the validation
		 * framework as well while still using internationalized messages.
		 * 
		 */
		if(!service.isEmployeeSsnUnique(employee.getId(), employee.getSsn())){
			FieldError ssnError =new FieldError("employee","ssn",messageSource.getMessage("non.unique.ssn", new String[]{employee.getSsn()}, Locale.getDefault()));
		    result.addError(ssnError);
			return "registration";
		}
		
		service.saveEmployee(employee);

		model.addAttribute("success", "Employee " + employee.getName() + " registered successfully");
		return "success";
	}


	/*
	 * This method will provide the medium to update an existing employee.
	 */
	@RequestMapping(value = { "/edit-{ssn}-employee" }, method = RequestMethod.GET)
	public String editEmployee(@PathVariable String ssn, ModelMap model) {
		Employee employee = service.findEmployeeBySsn(ssn);
		model.addAttribute("employee", employee);
		model.addAttribute("edit", true);
		return "registration";
	}
	
	/*
	 * This method will be called on form submission, handling POST request for
	 * updating employee in database. It also validates the user input
	 */
	@RequestMapping(value = { "/edit-{ssn}-employee" }, method = RequestMethod.POST)
	public String updateEmployee(@Valid Employee employee, BindingResult result,
			ModelMap model, @PathVariable String ssn) {

		if (result.hasErrors()) {
			return "registration";
		}

		if(!service.isEmployeeSsnUnique(employee.getId(), employee.getSsn())){
			FieldError ssnError =new FieldError("employee","ssn",messageSource.getMessage("non.unique.ssn", new String[]{employee.getSsn()}, Locale.getDefault()));
		    result.addError(ssnError);
			return "registration";
		}

		service.updateEmployee(employee);

		model.addAttribute("success", "Employee " + employee.getName()	+ " updated successfully");
		return "success";
	}

	
	/*
	 * This method will delete an employee by it's SSN value.
	 */
	@RequestMapping(value = { "/delete-{ssn}-employee" }, method = RequestMethod.GET)
	public String deleteEmployee(@PathVariable String ssn) {
		service.deleteEmployeeBySsn(ssn);
		return "redirect:/list";
	}

}

這是一個(gè)非常直接的基于Spring的控制器。 @Controller表明這個(gè)類是一個(gè)控制器在處理與模式映射@RequestMapping請求。這里用“/”，它被作為默認(rèn)的控制器。

listEmployees方法標(biāo)注了@ RequestMethod.GET，同時(shí)處理默認(rèn)的網(wǎng)址 “/” 和 ‘/list’。它充當(dāng)處理應(yīng)用初始頁面，顯示現(xiàn)有雇員的列表。

newEmployee方法處理新員工注冊頁面的GET請求，表示通過模型 Employee 對象支持頁面。

方法 saveEmployee 被注解為@ RequestMethod.POST，并且將處理新員工登記表單提交 POST 請求 (‘/new’)。注間這個(gè)方法的參數(shù)和它們的順序。

@Valid要求Spring來驗(yàn)證相關(guān)的對象(Employee)。 BindingResult包含此驗(yàn)證，并可能在此驗(yàn)證過程中發(fā)生任何錯(cuò)誤的結(jié)果。請注意，BindingResult必須出現(xiàn)在驗(yàn)證對象，否則Spring將無法驗(yàn)證并且拋出一個(gè)異常。如果驗(yàn)證失敗，自定義錯(cuò)誤信息(因?yàn)槲覀円呀?jīng)配置在步驟4)中顯示。

我們還包括代碼檢查SSN唯一性，因?yàn)樗暶饕跀?shù)據(jù)庫中具有唯一必。保存/更新員工之前要檢查，如果SSN是否獨(dú)一無二。如果沒有，我們生成驗(yàn)證錯(cuò)誤和重定向到注冊頁面。這個(gè)代碼展示出一種方式來填充在自定義錯(cuò)誤校驗(yàn)框架之外，同時(shí)仍使用國際化的信息。

第7步：添加DAO層

com.yiibai.springmvc.dao.AbstractDao

package com.yiibai.springmvc.dao;

import java.io.Serializable;

import java.lang.reflect.ParameterizedType;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;

public abstract class AbstractDao<PK extends Serializable, T> {
	
	private final Class<T> persistentClass;
	
	@SuppressWarnings("unchecked")
	public AbstractDao(){
		this.persistentClass =(Class<T>) ((ParameterizedType) this.getClass().getGenericSuperclass()).getActualTypeArguments()[1];
	}
	
	@Autowired
	private SessionFactory sessionFactory;

	protected Session getSession(){
		return sessionFactory.getCurrentSession();
	}

	@SuppressWarnings("unchecked")
	public T getByKey(PK key) {
		return (T) getSession().get(persistentClass, key);
	}

	public void persist(T entity) {
		getSession().persist(entity);
	}

	public void delete(T entity) {
		getSession().delete(entity);
	}
	
	protected Criteria createEntityCriteria(){
		return getSession().createCriteria(persistentClass);
	}

}

這個(gè)通用類是所有的DAO實(shí)現(xiàn)類的基類。它提供包裝方法也是常見的hibernate 操作。

注意上面，我們已經(jīng)在前面第3步創(chuàng)建了SessionFactory，在這里將自動裝配。

com.yiibai.springmvc.dao.EmployeeDao

package com.yiibai.springmvc.dao;

import java.util.List;

import com.yiibai.springmvc.model.Employee;

public interface EmployeeDao {

	Employee findById(int id);

	void saveEmployee(Employee employee);
	
	void deleteEmployeeBySsn(String ssn);
	
	List<Employee> findAllEmployees();

	Employee findEmployeeBySsn(String ssn);

}

com.yiibai.springmvc.dao.EmployeeDaoImpl

package com.yiibai.springmvc.dao;

import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.criterion.Restrictions;
import org.springframework.stereotype.Repository;

import com.yiibai.springmvc.model.Employee;

@Repository("employeeDao")
public class EmployeeDaoImpl extends AbstractDao<Integer, Employee> implements EmployeeDao {

	public Employee findById(int id) {
		return getByKey(id);
	}

	public void saveEmployee(Employee employee) {
		persist(employee);
	}

	public void deleteEmployeeBySsn(String ssn) {
		Query query = getSession().createSQLQuery("delete from Employee where ssn = :ssn");
		query.setString("ssn", ssn);
		query.executeUpdate();
	}

	@SuppressWarnings("unchecked")
	public List<Employee> findAllEmployees() {
		Criteria criteria = createEntityCriteria();
		return (List<Employee>) criteria.list();
	}

	public Employee findEmployeeBySsn(String ssn) {
		Criteria criteria = createEntityCriteria();
		criteria.add(Restrictions.eq("ssn", ssn));
		return (Employee) criteria.uniqueResult();
	}
}

第8步：添加服務(wù)層

com.yiibai.springmvc.service.EmployeeService

package com.yiibai.springmvc.service;

import java.util.List;

import com.yiibai.springmvc.model.Employee;

public interface EmployeeService {

	Employee findById(int id);
	
	void saveEmployee(Employee employee);
	
	void updateEmployee(Employee employee);
	
	void deleteEmployeeBySsn(String ssn);

	List<Employee> findAllEmployees(); 
	
	Employee findEmployeeBySsn(String ssn);

	boolean isEmployeeSsnUnique(Integer id, String ssn);
	
}

com.yiibai.springmvc.service.EmployeeServiceImpl

package com.yiibai.springmvc.service;

import java.util.List;

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

import com.yiibai.springmvc.dao.EmployeeDao;
import com.yiibai.springmvc.model.Employee;

@Service("employeeService")
@Transactional
public class EmployeeServiceImpl implements EmployeeService {

	@Autowired
	private EmployeeDao dao;
	
	public Employee findById(int id) {
		return dao.findById(id);
	}

	public void saveEmployee(Employee employee) {
		dao.saveEmployee(employee);
	}

	/*
	 * Since the method is running with Transaction, No need to call hibernate update explicitly.
	 * Just fetch the entity from db and update it with proper values within transaction.
	 * It will be updated in db once transaction ends. 
	 */
	public void updateEmployee(Employee employee) {
		Employee entity = dao.findById(employee.getId());
		if(entity!=null){
			entity.setName(employee.g

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