剛開始接觸Hibernate有些舉手無措，覺得配置信息太多。經過一個星期的適應，Hibernate比sql簡單方便多了。下面做一下Hibernate+jsp+selvect+HQL登入驗證。

第一步：編寫用戶實體類和配置用戶Users2.hbm.xml映射。

/* * 用戶實體類 */public class Users2 { PRivate int id;//用戶id private String name;//用戶昵稱 private String passWord;//用戶密碼 private String telephone;//用戶號碼 private String username;//用戶姓名 private String isadmin;//是否是管理員//省略get和set方法}

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping    package="entity">    <class name="Users2" table="Users2">        <id name="id">            <generator class="increment"/>        </id>        <property name="name" />        <property name="password" />        <property name="telephone" />        <property name="username" />        <property name="isadmin"/>    </class></hibernate-mapping>

第二步：配置hibernate.cfg.xml映射

<!DOCTYPE hibernate-configuration PUBLIC    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration>    <session-factory name="foo">        <!-- 數據庫方言 -->        <property name="dialect">            org.hibernate.dialect.OracleDialect        </property>        <!-- 連接數據庫Url -->        <property name="hibernate.connection.url">            jdbc:oracle:thin:@localhost:1521:orcl        </property>        <!-- 連接驅動 -->        <property name="hibernate.connection.driver_class">            oracle.jdbc.driver.OracleDriver        </property>        <!-- 用戶名 -->        <property name="hibernate.connection.username">epet</property>        <!-- 密碼 -->        <property name="hibernate.connection.password">123456</property>                <!-- 在控制臺打印sql信息 -->        <property name="show_sql">true</property>        <!-- 創建表結構 -->        <property name="hibernate.hbm2ddl.auto">update</property>            <!-- 配置映射信息 -->        <mapping resource="entity/Users2.hbm.xml" />                    </session-factory></hibernate-configuration>

第三步：編寫HibernateUtil幫助類，dao和daoImpl

package com.msit.hibernate.HibernateUtil;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtil {        public HibernateUtil(){            };        public static SessionFactory SessionFactory = null;        static{        //hibernate        Configuration cf = new Configuration();        cf.configure();        SessionFactory = cf.buildSessionFactory();//DriverManager.getconnection()        //Session session = SessionFactory.openSession();/    }        public static Session getSession(){                return SessionFactory.openSession();    }        public static void closeSession(Session session){        if(session!=null){            session.clear();        }    }}

public interface UserDao {    /*     * 驗證登入     */    public int isExist(String name,String password);}

public class UserDaoImpl implements UserDao{    public int isExist(String name, String password) {             int i=0;             //獲取Session         Session session = HibernateUtil.getSession();         //開啟事物         Transaction Transaction=session.beginTransaction();               //HQL語句          Query query = session.createQuery("from Users2 u where u.username = ? and u.password = ?");         query.setString(0, name);         query.setString(1, password);          List<Users2> list = query.list();        if(list.size()>0){            i=1;        }else{            i=0;        }                      return i;    }}

第四步：編寫UserSelvect和web_xml

package selvect;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;import Biz.Users2Biz;import Biz.Impl.Users2BizImpl;public class UserSelvect extends HttpServlet {    /**     * Constructor of the object.     */    public UserSelvect() {        super();    }    /**     * Destruction of the servlet. <br>     */    public void destroy() {        super.destroy(); // Just puts "destroy" string in log        // Put your code here    }    /**     * The doGet method of the servlet. <br>     *     * This method is called when a form has its tag value method equals to get.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doPost(request, response);    }    /**     * The doPost method of the servlet. <br>     *     * This method is called when a form has its tag value method equals to post.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("utf-8");        String name=request.getParameter("name");        String password=request.getParameter("password");        Users2Biz biz=new Users2BizImpl();        int i=biz.isExist(name, password);        if(i>0){                        response.sendRedirect("index.jsp");        }else{            response.sendRedirect("login.jsp");                    }        }    /**     * Initialization of the servlet. <br>     *     * @throws ServletException if an error occurs     */    public void init() throws ServletException {        // Put your code here    }}

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"     xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">                        <!--驗證用戶登入-->    <servlet>    <servlet-name>UserSelvect</servlet-name>    <servlet-class>selvect.UserSelvect</servlet-class>    </servlet>      <!-- 映射servlet -->  <servlet-mapping>      <servlet-name>UserSelvect</servlet-name>      <url-pattern>/UserSelvect</url-pattern>  </servlet-mapping>        <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

login.jsp頁面

<H4>用戶登錄</H4><FORM  method="post" action="UserSelvect"><DIV class=infos><TABLE class=field>  <TBODY>  <TR>    <TD colSpan=2></TD></TR>  <TR>    <TD class=field>用 戶 名：</TD>    <TD><!-- <input type="text" class="text" name="name" /> --><INPUT       id=user_name class=text type=text name=name> </TD></TR>  <TR>    <TD class=field>密　　碼：</TD>    <TD><input type="password" class="text" name="password" /> </TD></TR></TBODY></TABLE><DIV class=buttons> <INPUT onclick='document.location="UserSelvect"' value=登陸 type="submit"> <INPUT onclick='document.location="regs.jsp"' value=注冊 type=button> </DIV></DIV></FORM>

成功頁面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="descrCSS" href="styles.css">    -->  </head>    <body>   登入成功。  </body></html>