Статьи

Образец приложения Spring MVC3 Hibernate CRUD

Изучить любой веб-фреймворк, начиная с приложения HelloWorld — хорошая идея. Как только мы познакомимся с конфигурацией фреймворка, было бы лучше создать приложение CRUD (создание, чтение, обновление, удаление), которое охватывает различные аспекты веб-фреймворка, такие как проверки, сопоставления URL-адресов запроса, привязка параметров запроса, предварительное заполнение форм и т.д. ,

Теперь я собираюсь объяснить, как написать простое приложение CRUD, используя Spring MVC3, Hibernate и MySQL. Наше приложение — это ContactsManagements, где вы можете просматривать или искать контакты, создавать новые контакты, редактировать или удалять существующие контакты.

Шаг № 1: Создать таблицу КОНТАКТОВ

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CREATE TABLE  CONTACTS
(
  id int(10) unsigned NOT NULL AUTO_INCREMENT,
  name varchar(45) NOT NULL,
  address varchar(45) DEFAULT NULL,
  gender char(1) DEFAULT 'M',
  dob datetime DEFAULT NULL,
  email varchar(45) DEFAULT NULL,
  mobile varchar(15) DEFAULT NULL,
  phone varchar(15) DEFAULT NULL,
  PRIMARY KEY (id)
);

Шаг № 2: Скопируйте SpringMVC, Hibernate и их зависимые файлы в папку WEB-INF / lib. Если вы используете Maven, вы можете упомянуть следующие зависимости.

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<dependencies>
  <dependency>
    <groupid>junit</groupid>
    <artifactid>junit</artifactid>
    <version>4.8.1</version>
    <type>jar</type>
    <scope>compile</scope>
   </dependency>
   <dependency>
     <groupid>org.springframework</groupid>
     <artifactid>spring-web</artifactid>
     <version>3.0.5.RELEASE</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.springframework</groupid>
     <artifactid>spring-core</artifactid>
     <version>3.0.5.RELEASE</version>
     <type>jar</type>
     <scope>compile</scope>
     <exclusions>
      <exclusion>
       <artifactid>commons-logging</artifactid>
       <groupid>commons-logging</groupid>
      </exclusion>
     </exclusions>
    </dependency>
    <dependency>
     <groupid>log4j</groupid>
     <artifactid>log4j</artifactid>
     <version>1.2.14</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.springframework</groupid>
     <artifactid>spring-tx</artifactid>
     <version>3.0.5.RELEASE</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>jstl</groupid>
     <artifactid>jstl</artifactid>
     <version>1.1.2</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>taglibs</groupid>
     <artifactid>standard</artifactid>
     <version>1.1.2</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.springframework</groupid>
     <artifactid>spring-webmvc</artifactid>
     <version>3.0.5.RELEASE</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.springframework</groupid>
     <artifactid>spring-aop</artifactid>
     <version>3.0.5.RELEASE</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>commons-digester</groupid>
     <artifactid>commons-digester</artifactid>
     <version>2.1</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>commons-collections</groupid>
     <artifactid>commons-collections</artifactid>
     <version>3.2.1</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.hibernate</groupid>
     <artifactid>hibernate-core</artifactid>
     <version>3.3.2.GA</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>javax.persistence</groupid>
     <artifactid>persistence-api</artifactid>
     <version>1.0</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>c3p0</groupid>
     <artifactid>c3p0</artifactid>
     <version>0.9.1.2</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.springframework</groupid>
     <artifactid>spring-orm</artifactid>
     <version>3.0.5.RELEASE</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.slf4j</groupid>
     <artifactid>slf4j-api</artifactid>
     <version>1.6.1</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.slf4j</groupid>
     <artifactid>slf4j-log4j12</artifactid>
     <version>1.6.1</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>cglib</groupid>
     <artifactid>cglib-nodep</artifactid>
     <version>2.2</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>org.hibernate</groupid>
     <artifactid>hibernate-annotations</artifactid>
     <version>3.4.0.GA</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>jboss</groupid>
     <artifactid>javassist</artifactid>
     <version>3.7.ga</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
    <dependency>
     <groupid>mysql</groupid>
     <artifactid>mysql-connector-java</artifactid>
     <version>5.1.14</version>
     <type>jar</type>
     <scope>compile</scope>
    </dependency>
  </dependencies>

Шаг № 3: Настройка SpringMVC

а) Настройте DispatcherServlet в web.xml

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<servlet>
  <servlet-name>dispatcher</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
 </servlet>
   
 <servlet-mapping>
  <servlet-name>dispatcher</servlet-name>
  <url-pattern>*.do</url-pattern>
 </servlet-mapping>
  
 <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 <context-param>
     <param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value>
  </context-param>

б) Настройте View Resolver в WEB-INF / dispatcher-servlet.xml

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<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"
 p:prefix="/jsp/" p:suffix=".jsp">
</bean>

c) Настройте поддержку аннотаций, PropertyPlaceHolderConfigurer, ResourceBundleMessageSource в WEB-INF / classes / applicationContext.xml

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<context:annotation-config></context:annotation-config>
 
<context:component-scan base-package="com.sivalabs"></context:component-scan>
 
<mvc:annotation-driven> </mvc:annotation-driven>
 
<context:property-placeholder location="classpath:config.properties"></context:property-placeholder>
 
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"
 p:basename="Messages"></bean>

Шаг № 4: Настройте параметры соединения JDBC и свойства Hibernate в config.properties

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################### JDBC Configuration ##########################
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/sivalabs
jdbc.username=root
jdbc.password=admin
  
################### Hibernate Configuration ##########################
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
#hibernate.hbm2ddl.auto=update
hibernate.generate_statistics=true

Шаг № 5: Настройте источник данных, SessionFactory, поддержку TransactionManagement в WEB-INF / classes / applicationContext.xml

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<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"
 p:driverclassname="${jdbc.driverClassName}" p:url="${jdbc.url}" p:username="${jdbc.username}" p:password="${jdbc.password}">
</bean>
 
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
 <property name="dataSource" ref="dataSource"></property>
 <property name="hibernateProperties">
  <props>      
  <prop key="hibernate.dialect">${hibernate.dialect}</prop>        
  <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
  </props>
 </property>
 <property name="packagesToScan" value="com.sivalabs"></property>
</bean>
 
 
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"
  p:sessionfactory-ref="sessionFactory">
</bean>
 
<tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

Шаг № 6: Настройте метки, сообщения об ошибках в WEB-INF / classes / Messages.properties

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App.Title=SivaLabs
typeMismatch.java.util.Date={0} is Invalid Date.
dob=DOB

Шаг № 7: Создайте класс Entity Contact.java

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package com.sivalabs.contacts;
  
import java.util.Date;
  
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
  
import org.apache.commons.lang.builder.ToStringBuilder;
  
@Entity
@Table(name="CONTACTS")
public class Contact
{
 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private int id;
 @Column private String name;
 @Column private String address;
 @Column private String gender;
 @Column private Date dob;
 @Column private String email;
 @Column private String mobile;
 @Column private String phone;
   
 @Override
 public String toString()
 {
  return ToStringBuilder.reflectionToString(this);
 }
 //setters & getters
}

Шаг № 8: Создайте ContactsDAO.java, который выполняет операции CRUD над таблицей CONTACTS.

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package com.sivalabs.contacts;
  
import java.util.List;
  
import org.hibernate.Criteria;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
  
@Repository
@Transactional
public class ContactsDAO
{
 @Autowired
 private SessionFactory sessionFactory;
   
 public Contact getById(int id)
 {
  return (Contact) sessionFactory.getCurrentSession().get(Contact.class, id);
 }
   
 @SuppressWarnings("unchecked")
 public List searchContacts(String name)
 {
  Criteria criteria = sessionFactory.getCurrentSession().createCriteria(Contact.class);
  criteria.add(Restrictions.ilike("name", name+"%"));
  return criteria.list();
 }
   
 @SuppressWarnings("unchecked")
 public List getAllContacts()
 {
  Criteria criteria = sessionFactory.getCurrentSession().createCriteria(Contact.class);
  return criteria.list();
 }
   
 public int save(Contact contact)
 {
  return (Integer) sessionFactory.getCurrentSession().save(contact);
 }
   
 public void update(Contact contact)
 {
  sessionFactory.getCurrentSession().merge(contact);
 }
   
 public void delete(int id)
 {
  Contact c = getById(id);
  sessionFactory.getCurrentSession().delete(c);
 }
}

Шаг № 9: Создайте ContactFormValidator.java, который выполняет проверки при сохранении / обновлении контакта.

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package com.sivalabs.contacts;
  
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;
  
@Component("contactFormValidator")
public class ContactFormValidator implements Validator
{
 @SuppressWarnings("unchecked")
 @Override
 public boolean supports(Class clazz)
 {
  return Contact.class.isAssignableFrom(clazz);
 }
  
 @Override
 public void validate(Object model, Errors errors)
 {
  ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name","required.name", "Name is required.");
 }
}

Шаг № 10: Создайте ContactsControllers.java, который обрабатывает все запросы CRUD.

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package com.sivalabs.contacts;
  
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
  
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.support.SessionStatus;
import org.springframework.web.servlet.ModelAndView;
  
@Controller
public class ContactsControllers
{
 @Autowired
 private ContactsDAO contactsDAO;
   
 @Autowired
 private ContactFormValidator validator;
    
 @InitBinder
 public void initBinder(WebDataBinder binder)
 {
  SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
  dateFormat.setLenient(false);
  binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
 }
    
 @RequestMapping("/searchContacts")
 public ModelAndView searchContacts(@RequestParam(required= false, defaultValue="") String name)
 {
  ModelAndView mav = new ModelAndView("showContacts");
  List contacts = contactsDAO.searchContacts(name.trim());
  mav.addObject("SEARCH_CONTACTS_RESULTS_KEY", contacts);
  return mav;
 }
   
 @RequestMapping("/viewAllContacts")
 public ModelAndView getAllContacts()
 {
  ModelAndView mav = new ModelAndView("showContacts");
  List contacts = contactsDAO.getAllContacts();
  mav.addObject("SEARCH_CONTACTS_RESULTS_KEY", contacts);
  return mav;
 }
   
 @RequestMapping(value="/saveContact", method=RequestMethod.GET)
 public ModelAndView newuserForm()
 {
  ModelAndView mav = new ModelAndView("newContact");
  Contact contact = new Contact();
  mav.getModelMap().put("newContact", contact);
  return mav;
 }
   
 @RequestMapping(value="/saveContact", method=RequestMethod.POST)
 public String create(@ModelAttribute("newContact")Contact contact, BindingResult result, SessionStatus status)
 {
  validator.validate(contact, result);
  if (result.hasErrors())
  {  
   return "newContact";
  }
  contactsDAO.save(contact);
  status.setComplete();
  return "redirect:viewAllContacts.do";
 }
   
 @RequestMapping(value="/updateContact", method=RequestMethod.GET)
 public ModelAndView edit(@RequestParam("id")Integer id)
 {
  ModelAndView mav = new ModelAndView("editContact");
  Contact contact = contactsDAO.getById(id);
  mav.addObject("editContact", contact);
  return mav;
 }
   
 @RequestMapping(value="/updateContact", method=RequestMethod.POST)
 public String update(@ModelAttribute("editContact") Contact contact, BindingResult result, SessionStatus status)
 {
  validator.validate(contact, result);
  if (result.hasErrors()) {
   return "editContact";
  }
  contactsDAO.update(contact);
  status.setComplete();
  return "redirect:viewAllContacts.do";
 }
    
 @RequestMapping("deleteContact")
 public ModelAndView delete(@RequestParam("id")Integer id)
 {
  ModelAndView mav = new ModelAndView("redirect:viewAllContacts.do");
  contactsDAO.delete(id);
  return mav;
 }
}

Шаг № 11: Вместо записи описаний библиотеки тегов JSTL во всех JSP, объявите их в одной JSP и включите эту JSP в другие JSP.

taglib_includes.jsp

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<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
  
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>

Шаг № 12: Создайте JSP.

а) showContacts.jsp

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<%@include file="taglib_includes.jsp" %>
  
<html>
<head>
  
<title><spring:message code="App.Title"></spring:message> </title>
<script type="text/javascript" src="js/contacts.js"></script>
</head>
<body style="font-family: Arial; font-size:smaller;">
 <center>
 <form action="searchContacts.do" method="post"><table style="border-collapse: collapse;" width="500" border="0" bordercolor="#006699"><tbody><tr>     <td>Enter Contact Name</td>      <td><input name="name" type="text">
  
  <input value="Search" type="submit">
  
  <input value="New Contact" onclick="javascript:go('saveContact.do');" type="button">
  
</td></tr>
</tbody></table></form><c:if test="${empty SEARCH_CONTACTS_RESULTS_KEY}">
</c:if><c:if test="${! empty SEARCH_CONTACTS_RESULTS_KEY}">    <c:foreach var="contact" items="${SEARCH_CONTACTS_RESULTS_KEY}">
</c:foreach></c:if><table style="border-collapse: collapse;" width="500" border="1" bordercolor="#006699"><tbody><tr bgcolor="lightblue">    <th>Id</th>    <th>Name</th>       <th>Address</th>     <th>Mobile</th>    <th></th>   </tr>
<tr>    <td colspan="4">No Results found</td>   </tr>
   <tr>     <td><c:out value="${contact.id}"></c:out></td>     <td><c:out value="${contact.name}"></c:out></td>     <td><c:out value="${contact.address}"></c:out> </td>     <td><c:out value="${contact.mobile}"></c:out></td>     <td>
  
 <a href="updateContact.do?id=$%7Bcontact.id%7D">Edit</a>
  
  <a href="javascript:deleteContact('deleteContact.do?id=${contact.id}');">Delete</a>
  
</td>    </tr>
         </tbody></table></center>
    
</body>
</html>

б) newContact.jsp

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<%@include file="taglib_includes.jsp" %>
  
<html>
<head>
 <script type="text/javascript" src="js/contacts.js"></script>
 <title><spring:message code="App.Title"></spring:message> </title>
</head>
<body style="font-family: Arial; font-size:smaller;">
  
<table style="border-collapse: collapse;" width="750" align="center" bgcolor="lightblue" border="1" bordercolor="#006699" height="500"><tbody><tr>   <td align="center"><h3>Edit Contact Form</h3></td>  </tr>
<tr valign="top" align="center">     <td align="center">
  
<form:form action="saveContact.do" method="post" commandname="newContact"><table style="border-collapse: collapse;" width="500" border="0" bordercolor="#006699" cellpadding="2" cellspacing="2"><tbody><tr>       <td width="100" align="right">Name</td>       <td width="150">
  
<form:input path="name"></form:input></td>       <td align="left">
  
<form:errors path="name" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">DOB</td>       <td><form:input path="dob"></form:input></td>       <td align="left"><form:errors path="dob" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">Gender</td>       <td>    
  
<form:select path="gender"><form:option value="M" label="Male"><form:option value="F" label="Female"></form:option></form:option></form:select></td>       <td>
  
</td>            </tr>
<tr>       <td width="100" align="right">Address</td>       <td><form:input path="address"></form:input></td>       <td align="left">
  
<form:errors path="address" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">Email</td>       <td><form:input path="email"></form:input></td>       <td align="left"><form:errors path="email" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">Mobile</td>       <td><form:input path="mobile"></form:input></td>       <td align="left">
  
<form:errors path="mobile" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td colspan="3" align="center">
  
<input name="" value="Save" type="submit">
  
    
  
<input name="" value="Reset" type="reset">
  
    
  
<input value="Back" onclick="javascript:go('viewAllContacts.do');" type="button">
  
</td>      </tr>
</tbody></table></form:form></td>       </tr>
</tbody></table></body>
</html>

а) editContact.jsp

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<%@include file="taglib_includes.jsp" %>
  
<html>
<head>
 <script type="text/javascript" src="js/contacts.js"></script>
 <title><spring:message code="App.Title"></spring:message> </title>
</head>
<body style="font-family: Arial; font-size:smaller;">
  
<table style="border-collapse: collapse;" width="750" align="center" bgcolor="lightblue" border="1" bordercolor="#006699" height="500"><tbody><tr>   <td align="center"><h3>Edit Contact Form</h3></td>  </tr>
<tr valign="top" align="center">     <td align="center">
  
<form:form action="updateContact.do" method="post" commandname="editContact"><table style="border-collapse: collapse;" width="500" border="0" bordercolor="#006699" cellpadding="2" cellspacing="2"><tbody><tr>       <td width="100" align="right">Id</td>       <td width="150">
  
<form:input path="id" readonly="true"></form:input></td>       <td align="left">
  
<form:errors path="id" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">Name</td>       <td>
  
<form:input path="name"></form:input></td>       <td align="left">
  
<form:errors path="name" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">DOB</td>       <td><form:input path="dob"></form:input></td>       <td align="left"><form:errors path="dob" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">Gender</td>       <td>    
  
<form:select path="gender"><form:option value="M" label="Male"><form:option value="F" label="Female"></form:option></form:option></form:select></td>       <td>
  
</td>            </tr>
<tr>       <td width="100" align="right">Address</td>       <td><form:input path="address"></form:input></td>       <td align="left">
  
<form:errors path="address" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">Email</td>       <td><form:input path="email"></form:input></td>       <td align="left"><form:errors path="email" cssstyle="color:red"></form:errors></td>      </tr>
<tr>       <td width="100" align="right">Mobile</td>       <td><form:input path="mobile"></form:input></td>       <td align="left">
  
<form:errors path="mobile" cssstyle="color:red"></form:errors></td>      </tr>
<tr valign="bottom">       <td colspan="3" align="center">
  
<input value="Delete" onclick="javascript:deleteContact('deleteContact.do?id=${editContact.id}');" type="button">
  
    
  
<input name="" value="Save" type="submit">    
  
    
  
<input value="Back" onclick="javascript:go('viewAllContacts.do');" type="button">
  
</td>      </tr>
</tbody></table></form:form></td>       </tr>
</tbody></table></body>
</html>

Шаг № 13: Напишите файл javascript js / contacts.js, содержащий служебные методы

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function go(url)
{
 window.location = url;
}
  
function deleteContact(url)
{
 var isOK = confirm("Are you sure to delete?");
 if(isOK)
 {
  go(url);
 }
}

Шаг № 14: Приветственный файл index.jsp

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<%
response.sendRedirect("viewAllContacts.do");
%>

Шаг № 15: Запустите сервер и укажите URL вашего браузера на http: // localhost: 8080 / SpringMVCHibernate

Справка: Образец приложения Spring MVC3 Hibernate CRUD от нашего партнера JCG Шивы из SivaLabs .