休眠 – 网络应用程序

使用休眠的 Web 应用程序更容易。 JSP 页面是获取用户输入的最佳方式。这些输入被传递给 servlet，最后，通过使用 hibernate 将其插入到数据库中。这里 JSP 页面用于表示逻辑。 Servlet 类用于控制器层。 DAO 类用于数据库访问代码。

本项目使用的工具和技术：

• JDK 1.6+ 起
• Hibernate 3.6.3.Final 或下一个版本
• 蚀
• MySQL 5.5。或下一个版本
• 雄猫

随着 Hibernate – Web 应用程序的准备工作，该项目将作为一个动态 Web 项目进行准备。以下 jars 需要放在 WEB-INF/lib 文件夹中

从用户获取输入的前端 JSP 页面

注册.jsp

HTML

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
 









  

    

    
GeekUser Registration Form
    

        
            
                
                
            
            
                
                
            
 
            
                
                
            
            
                
                
            
            
                
                
            
            
                
                
            
        
User Name :
Password :
Confirm Password :
email :
Phone :
City :

        

        
    
    
    
    

Java

import com.gfg.hibernate.dao.GeekUserDAO;
 
public class GeekUserControllerServlet extends HttpServlet {
     
    private static final long serialVersionUID = 1L;
 
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
       
        // From register.jsp, the controls
        // are passed to this controller servlet
        String userName = request.getParameter("userName");
        String password = request.getParameter("password1");
        String email = request.getParameter("email");
        String phone = request.getParameter("phone");
        String city = request.getParameter("city");
        HttpSession session = request.getSession(true);
        try {
            GeekUserDAO userDAO = new GeekUserDAO();
            // Via DAO class addGeelUser method,
            // the data is inserted into the table
            userDAO.addGeekUser(userName, password, email, phone, city);
            // After that it is redirected to the success page
            response.sendRedirect("Success");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Java

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.gfg.hibernate.bean.GeekUser;
public class GeekUserDAO {   
    // Method to insert GeekUser in the database
    public Integer addGeekUser(String userName,
     String password,
     String email,
     String phone,
     String city) {
         SessionFactory sessionFactory;
            try {
                sessionFactory = new Configuration().configure().buildSessionFactory();
            } catch (Throwable ex) {
                System.err.println("Failed to create sessionFactory object." + ex);
                throw new ExceptionInInitializerError(ex);
            }
        Session session = sessionFactory.openSession();
        Transaction tx = null;
        Integer employeeID = null;
        try {
            tx = session.beginTransaction();
            GeekUser geekUser = new GeekUser(userName, password, email,phone,city);
            employeeID = (Integer) session.save(geekUser);
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
        return employeeID;
    }
}

Java

public class GeekUser {
    // each and every attribute should have
    // the respective column in the database
    private int id;
    private String geekUserName;
    private String password;
    private String geekEmail;
    private String phone;
    private String city;   
    public GeekUser() {
         
    }
    // parameterized constructors are
    // necessary to carry the details
    public GeekUser(String userName,
     String password,
     String email,
     String phone,
     String city) {
        this.geekUserName = userName;
        this.password = password;
        this.geekEmail = email;
        this.phone = phone;
        this.city = city;
    }
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public String getGeekUserName() {
        return geekUserName;
    }
 
    public void setGeekUserName(String userName) {
        this.geekUserName = userName;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password1) {
        this.password = password1;
    }
 
    public String getGeekEmail() {
        return geekEmail;
    }
 
    public void setGeekEmail(String email) {
        this.geekEmail = email;
    }
 
    public String getPhone() {
        return phone;
    }
 
    public void setPhone(String phone) {
        this.phone = phone;
    }
 
    public String getCity() {
        return city;
    }
 
    public void setCity(String city) {
        this.city = city;
    }
 
}

Java

import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class SuccessPage extends HttpServlet {
 
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        PrintWriter writer = response.getWriter();
 
        writer.println("" + "" + "
"
                + "GeekUser details are added successfully via Hibernate. " + "" + ""
                + "");
    }
 
}

主休眠配置文件 > hibernate.cfg.xml

XML

    
        
        com.mysql.jdbc.Driver
        jdbc:mysql://localhost:3306/geeksforgeeks
        root
        
        XXXX
        org.hibernate.dialect.MySQLDialect
          
        true
        true
        create 
        
        
    

由于这是 Web 应用程序，让我们也看看 web.xml，这将有助于从 jsp 到 servlet 的数据流。

XML

    HibernateWebApp
    
        User
        User
        com.gfg.hibernate.controller.GeekUserControllerServlet
    
    
        Success
        Success
        com.gfg.hibernate.controller.SuccessPage
    
    
        User
        /register
    
    
        Success
        /Success
    
    
        register.jsp
    

项目视频文件：

结论

在本教程中，我们已经看到通过使用休眠的非常好的特性，数据以更简单的方式插入到数据库表中。更重要的是，对于任何类型的数据库，这都是有效的。如果我们要更改不同的数据库，我们需要更改 hibernate.cfg.xml 以支持它

XML

    
        org.hibernate.dialect.SQLServerDialect
        com.microsoft.jdbc.Driver
        jdbc.Microsoft://localhost/
        root
          
        ****
    

  
  
    oracle.jdbc.OracleDriver
    jdbc:oracle:thin:@localhost:1521:dbname
    user
    ***
    org.hibernate.dialect.Oracle8iDialect    
    true