struts_hibernate登陆范例

开发工具：MyEclipse 6.0 ，Tomcat 5.5 ，JDK 1.5  ，MySQL 5.0 ；开发准备：下载Struts 2.0和Hibernate 3.2，大家可Struts和Hibernate的官方网站下载这两个框架。我们先来总览一下开发完成后的包—类图：

首先NEW一个Web Project ，名为"LoginSystem" ，在 lib 目录下加入Struts 2.0的Jar包和Hibernate 3.2的Jar包，然后按下面的步骤来：

1、在 src 目录下建 "hibernate.cfg.xml" 全部代码如下：

<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>

         <property name="connection.username">root</property>
         <property name="connection.url">
             jdbc:mysql://localhost:3306/testmysql
         </property>
        <property name="dialect">
             org.hibernate.dialect.MySQLDialect
         </property>
         <property name="myeclipse.connection.profile">
             mysql
         </property>
         <property name="connection.password">root</property>
         <property name="connection.driver_class">
             com.mysql.jdbc.Driver
         </property>
         <property name="show_sql">true</property>
         <!-- POJO类映射配置 -->
         <mapping resource="com/rong/ORM/User.hbm.xml" />

	</session-factory>
</hibernate-configuration>

　　

 

2、建立实体类 "User.java" 及其映射文件 "User.hbm.xml" 两者都放在 "com.rong.ORM" 包下。其中"User.java"的代码如下：

package com.rong.ORM;

public class User {
    private int id;        //主键ID
    private String name;    //用户名
    private String pwd;        //密码

     /*
     * Getter方法与Setter方法
     */
     public String getName() {
        return name;
    }
     public void setName(String name) {
        this.name = name;
    }
     public String getPwd() {
        return pwd;
    }
     public void setPwd(String pwd) {
        this.pwd = pwd;
    }
     public int getId() {
        return id;
    }
     public void setId(int id) {
        this.id = id;
    }

}

　　

 

User.hbm.xml的代码如下：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

 <hibernate-mapping>
     <class name="com.rong.ORM.User" table="tb_user">
         <id name="id">
             <generator class="native"/>
         </id>
         <property name="name" type="java.lang.String" length="20"/>
         <property name="pwd" type="java.lang.String" length="20"/>
     </class>
 </hibernate-mapping>

　　

 

3、建立"ExportDB.java"工具类，我们执行如下代码，就能轻松将User类导入数据库转变成数据库中的表。不过，前提是我们已经在MySQL中建立了一个名为"LoginSystem"的数据库。

package tool;

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class ExportDB {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
	    Configuration cfg = new Configuration().configure();
	    SchemaExport export = new SchemaExport(cfg);
	    export.create(true, true);

	}

}

　　

 

4、建立获取SessionFactory和管理Session的HibernateUtil.java类：

package com.rong.hibernate;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
	  //声明Hibernate配置文件所在的路径
	  private static String configFile = "/hibernate.cfg.xml";
	  //建Configuration对象
	  private static Configuration configuration = new Configuration();
	  //建Session工厂对象
	  private static SessionFactory sessionFactory = null;

	   /**
	   * 单例模式,只初始化一次,只产生一个SessionFactory对象(线程安全)
	   */
	   static {
	       try{
	          //通过hibernate.cfg.xml配置数据库连接
	          configuration.configure(configFile);
	          //建立一个Session工厂
	          sessionFactory = configuration.buildSessionFactory();
	          System.out.println("[标记]初始化SessionFactory");
	       }catch(Exception e){
	          System.out.println("[异常]创建SessionFactory时发生异常,异常原因如下:");
	          e.printStackTrace();
	      }
	  }

	   /**
	   * getSession()方法
	   * @return Session对象
	   * @throws HibernateException
	   */
	   public Session getSession(){
	      Session session = null;
	       try{
	          session = sessionFactory.openSession();
	       }catch(Exception e){
	          System.out.println("[异常]开启Session时发生异常,异常原因如下:");
	          e.printStackTrace();
	      }
	      return session;
	  }

	   /**
	   * closeSession()方法
	   * @param session 要关闭的Session对象
	   */
	   public void closeSession(Session session){
	       try{
	          if(null != session)
	              session.close();
	       }catch(Exception e){
	          System.out.println("[异常]关闭Session时发生异常,异常原因如下:");
	          e.printStackTrace();
	      }
	  }

}

　　

 

5、DAO层设计：在"com.rong.DAO" 包下建立两个类，一个是接口，一个是实现类，其中UserDao.java代码如下：

package com.rong.DAO;

import java.util.List;
import com.rong.ORM.User;

public interface UserDao {

	  /**
	  * 增加用户
	  * @param user 要增加的用户
	  */
	 public void add(User user);

	  /**
	  * 登录验证
	  * @param name
	  * @param password
	  * @return -1:不存在用户名 ; -2:密码不正确 ; >0:登录成功(即返回该记录ID)
	  */
	 public int isExist(String name,String password); 

}

　　

 

UserDaoImpl.java的代码如下

package com.rong.DAO;

import java.util.Iterator;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.rong.ORM.User;
import com.rong.hibernate.HibernateUtil;

public class UserDaoImpl implements UserDao {

	  HibernateUtil util = new HibernateUtil();

	   /**
	   * 增加用户
	   * @param user 要增加的用户
	   */
	   public void add(User user){
	      Session session = util.getSession();
	      Transaction ts = null;
	       try{
	          ts = session.beginTransaction();
	          session.save(user);
	          ts.commit();
	       }catch(Exception e){
	          System.out.println("UserDaoImpl.add()方法发生异常:");
	          e.printStackTrace();
	       }finally{
	          util.closeSession(session);
	      }
	  }

	   /**
	   * 登录验证
	   * @param name
	   * @param password
	   * @return -1:不存在用户名 ; -2:密码不正确 ; >0:登录成功(即返回该记录ID)
	   */
	   public int isExist(String name,String password){
	      //int state = 0 ;        //初始化状态变量
	      Session session = util.getSession();
	       try{
	          Query query = session.createQuery("from User u where u.name = ?");
	          query.setString(0, name);
	          List list = query.list();
	           if(null == list || 0 == list.size()){
	              return -1 ;     //用户名不存在
	          }
	          Query query2 = session.createQuery("from User u where u.name = ? and u.pwd = ?");
	          query2.setString(0, name);
	          query2.setString(1, password);
	          List list2 = query.list();
	           if(null == list2){
	              return -2 ;        //密码不正确
	          }
	          Iterator it = list.iterator();
	          User user = (User)it.next();
	          return user.getId();    //验证成功,取ID值

	       }catch(Exception e){
	          System.out.println("UserDaoImpl.isExist()方法发生异常:");
	          e.printStackTrace();
	          return 0;    //异常时返回0
	       }finally{
	          util.closeSession(session);
	      }
	  }

}

　　

 

6、在web.xml中配置Struts 2.0支持：

<?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">

   <!-- 用过滤器配置Struts2支持 -->
   <filter>
       <filter-name>struts2</filter-name>
       <filter-class>
           org.apache.struts2.dispatcher.FilterDispatcher
       </filter-class>
   </filter>
   <filter-mapping>
       <filter-name>struts2</filter-name>
       <url-pattern>/*</url-pattern>
   </filter-mapping>

  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

　　

 

7、登录页面login.jsp代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
  <%@ taglib prefix="s" uri="/struts-tags" %>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
     <head>

         <title>Login Page</title>
     </head>

     <body>
         <p><a href="register.jsp">用户注册</a>|用户登录</p>
                 <s:form action="loginAction" theme="simple">
             <table>
                 <tr>
                     <td style="text-align:right">
                         账号
                     </td>
                     <td>
                         <s:textfield name="name" label="账号" />

                     </td>
                 </tr>
                 <tr>
                     <td style="text-align:right">
                         密码
                     </td>
                     <td>
                         <s:password name="pwd" label="密码" />
                     </td>
                 </tr>
                 <tr>
                     <td style="text-align:right">
                         验证码
                     </td>
                     <td>
                         <s:textfield name="inputCertCode" label="验证码" cssStyle="width:100px"/>
                         <img src="makeCertPic.jsp">
                     </td>
                 </tr>
                 <tr>
                     <td style="text-align:right">
                         <s:submit value="登录" />
                     </td>
                     <td style="text-align:left">
                         <s:reset value="取消"/>
                     </td>
                 </tr>
             </table>
         </s:form>
         <s:fielderror cssStyle="color:red"/>
     </body>
 </html>

　　

 

注册页register.jsp代码如下

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
  <%@ taglib prefix="s" uri="/struts-tags"%>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
     <head>

         <title>Register Page</title>
     </head>

     <body>
         <p><a href="login.jsp">用户登录</a>|用户注册</p>
         <s:form action="registerAction" theme="simple" method="post">
             <table>
                 <tr>
                     <td style="text-align:right">
                         请输入账号
                     </td>
                     <td>
                         <s:textfield name="user.name" label="账号" />

                     </td>
                 </tr>
                 <tr>
                     <td style="text-align:right">
                         请输入密码
                     </td>
                     <td>
                         <s:password name="user.pwd" label="密码" />
                     </td>
                 </tr>
                 <tr>
                     <td style="text-align:right">
                         请再次输入密码
                     </td>
                     <td>
                         <s:password name="repwd" label="重复密码" />
                     </td>
                 </tr>
                 <tr>
                     <td style="text-align:right">
                         请输入验证码
                     </td>
                     <td>
                         <s:textfield name="inputCertCode" label="验证码" cssStyle="width:100px"/>
                         <img src="makeCertPic.jsp">
                     </td>
                 </tr>
                 <tr>
                     <td style="text-align:right">
                         <s:submit value="注册" />
                     </td>
                     <td style="text-align:left">
                         <s:reset value="取消"/>
                     </td>
                 </tr>
             </table>
         </s:form>
         <s:fielderror cssStyle="color:red"/>
     </body>
 </html>

　　

 

8、在JSP页中所用到的验证码的生成页面makeCertPic.jsp（我们把它放在WebRoot的other目录下）：

 <%@page contentType="image/jpeg" pageEncoding="gbk"%>
<jsp:useBean id="image" scope="page" class="com.rong.other.makeCertPic" />
 <%
    String str = image.getCertPic(0,0,response.getOutputStream());
    // 将验证码保存到Session中
    session.setAttribute("certCode", str);
%>

　　

 

其中，它调用了名为makeCertPic的Bean ，这个类主要用来生成彩色的验证图片，其代码如下：

package com.rong.other;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;

/**
 * 生成验证码图片
 */
 public class makeCertPic {
    //验证码图片中可以出现的字符集,可根据需要修改
     private char mapTable[]={
            'a','b','c','d','e','f',
            'g','h','i','j','k','l',
            'm','n','o','p','q','r',
            's','t','u','v','w','x',
            'y','z','0','1','2','3',
            '4','5','6','7','8','9'};
     /**
     * 功能:生成彩色验证码图片
     * 参数width为生成的图片的宽度,参数height为生成的图片的高度,参数os为页面的输出流
     */
     public String getCertPic(int width, int height, OutputStream os) {
        if(width<=0)width=60;
        if(height<=0)height=20;
        BufferedImage image = new BufferedImage(width, height,
                                    BufferedImage.TYPE_INT_RGB);
        // 获取图形上下文
        Graphics g = image.getGraphics();
        // 设定背景色
        g.setColor(new Color(0xDCDCDC));
        g.fillRect(0, 0, width, height);
        //画边框
        g.setColor(Color.black);
        g.drawRect(0,0,width-1,height-1);
        // 取随机产生的认证码
        String strEnsure = "";
        // 4代表4位验证码,如果要生成更多位的认证码,则加大数值
         for(int i=0; i<4; ++i) {
            strEnsure += mapTable[(int)(mapTable.length*Math.random())];
        }
        // 将认证码显示到图象中,如果要生成更多位的认证码,增加drawString语句
        g.setColor(Color.black);
        g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));
        String str = strEnsure.substring(0,1);
        g.drawString(str,8,17);
        str = strEnsure.substring(1,2);
        g.drawString(str,20,15);
        str = strEnsure.substring(2,3);
        g.drawString(str,35,18);
        str = strEnsure.substring(3,4);
        g.drawString(str,45,15);
        // 随机产生10个干扰点
        Random rand = new Random();
         for (int i=0;i<10;i++) {
            int x = rand.nextInt(width);
            int y = rand.nextInt(height);
            g.drawOval(x,y,1,1);
        }
        // 释放图形上下文
        g.dispose();
         try {
            // 输出图象到页面
            ImageIO.write(image, "JPEG", os);
         } catch (IOException e) {
            return "";
        }
        return strEnsure;
    }
}

　　

 

9、此时，我们很有必要来配置一下struts.xml其全部代码如下

<?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE struts PUBLIC
         "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
         "http://struts.apache.org/dtds/struts-2.0.dtd">

 <struts>

     <package name="com.rong.action" extends="struts-default">
         <!-- 用户登录 -->
         <action name="loginAction" class="com.rong.action.LoginAction">
             <result name="success" type="redirect">/back/index.jsp</result>
             <result name="input">/login.jsp</result>
         </action>
         <!-- 用户注册 -->
         <action name="registerAction" class="com.rong.action.RegisterAction">
             <result name="success" type="redirect">/login.jsp</result>
             <result name="input">/register.jsp</result>
         </action>
     </package>
 </struts>

　　

 

10、Action层设计：两个非常关键的类，其中LoginAction.java的代码如下：

package com.rong.action;

 import java.util.Map;
 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionSupport;
 import com.rong.DAO.UserDao;
 import com.rong.DAO.UserDaoImpl;
 import com.rong.ORM.User;

  public class LoginAction extends ActionSupport {

     private UserDao userDao = new UserDaoImpl();    //操纵数据库DAO类(Hibernate实现),通过Struts.xml注入值

     private int id;
     private String name;    //用户名(值由struts注入)
     private String pwd;        //密码(值由struts注入)

     private String inputCertCode;    //验证码

      public int getId() {
         return id;
     }
      public void setId(int id) {
         this.id = id;
     }
      public String getName() {
         return name;
     }
      public void setName(String name) {
         this.name = name;
     }
      public String getPwd() {
         return pwd;
     }
      public void setPwd(String pwd) {
         this.pwd = pwd;
     }

      public String getInputCertCode() {
         return inputCertCode;
     }
      public void setInputCertCode(String inputCertCode) {
         this.inputCertCode = inputCertCode;
     }
     @Override
      public String execute() throws Exception {
         int state = userDao.isExist(name,pwd);
         System.out.println("state="+state);
          if(state == -1){
             this.addFieldError("name", "用户名不正确,请先注册!");
             return INPUT;
          }else if(state == -2){
             this.addFieldError("pwd", "密码不正确,请重新输入密码!");
             return INPUT;
          }else if(state > 0){
             System.out.println("[测试]登录成功!用户ID="+state);
             this.setId(state);
             return SUCCESS;
          }else{
             this.addFieldError("name", "登录失败,请与管理员联系!");
             return INPUT;
         }
     }

      public void validate() {
         //验证码验证
          if(null == inputCertCode || "".equals(inputCertCode)){
             this.addFieldError("inputCertCode", "验证码不能为空!");
          }else{
             Map session = ActionContext.getContext().getSession();
             String certCode = session.get("certCode").toString();
              if( ! certCode.equals(this.inputCertCode)){
                 this.addFieldError("inputCertCode", "验证码不正确!");
             }
         }

     }

 }

　　

 

RegisterAction.java的代码如下：

package com.rong.action;

 import java.util.Map;

 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionSupport;
 import com.rong.DAO.UserDao;
 import com.rong.DAO.UserDaoImpl;
 import com.rong.ORM.User;

  public class RegisterAction extends ActionSupport {

     private UserDao userDao = new UserDaoImpl();

     private User user;    //注册提交的用户对象

     private String repwd;    //重复密码

     private String inputCertCode;    //验证码

      public User getUser() {
         return user;
     }

      public void setUser(User user) {
         this.user = user;
     }

      public String getRepwd() {
         return repwd;
     }

      public void setRepwd(String repwd) {
         this.repwd = repwd;
     }

      public String getInputCertCode() {
         return inputCertCode;
     }

      public void setInputCertCode(String inputCertCode) {
         this.inputCertCode = inputCertCode;
     }

     @Override
      public String execute() throws Exception {
         userDao.add(user);        //保存注册的user对象
         return SUCCESS;
     }

 /*    @Override
      public void validate() {
         //验证码验证
          if(null == inputCertCode || "".equals(inputCertCode)){
             this.addFieldError("inputCertCode", "验证码不能为空!");
          }else{
             Map session = ActionContext.getContext().getSession();
             String certCode = session.get("certCode").toString();
              if( ! certCode.equals(this.inputCertCode)){
                 this.addFieldError("inputCertCode", "验证码不正确!");
             }
         }

     }*/

 }

　　

 

11、不要忘记配置校验框架，与上面两个Action同一个目录下。LoginAction-validation.xml代码如下：

 <!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
     "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

 <validators>
     <!-- 用户名验证 -->
     <field name="name">
         <field-validator type="requiredstring">
             <param name="trim">true</param>
             <message>用户名不能为空!</message>
         </field-validator>
         <field-validator type="regex">
             <param name="expression"><![CDATA[(\w{4,8})]]></param>
             <message>账号必须是长度为4-8的数字或字母！</message>
         </field-validator>
     </field>
     <!-- 密码验证 -->
     <field name="pwd">
         <field-validator type="requiredstring">
             <param name="trim">true</param>
             <message>密码不能为空!</message>
         </field-validator>
         <field-validator type="regex">
             <param name="expression"><![CDATA[(\w{4,8})]]></param>
             <message>密码必须长度为4-8的数字或字母！</message>
         </field-validator>
     </field>

 </validators>

　　RegisterAction-validation.xml代码如下：

<!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
     "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

 <validators>

     <!-- 用户名验证 -->
     <field name="user.name">
         <field-validator type="requiredstring">
             <param name="trim">true</param>
             <message>用户名不能为空!</message>
         </field-validator>
         <field-validator type="regex">
             <param name="expression"><![CDATA[(\w{4,8})]]></param>
             <message>账号必须是长度为4-8的数字或字母！</message>
         </field-validator>
     </field>

     <!-- 密码验证 -->
     <field name="user.pwd">
         <field-validator type="requiredstring">
             <param name="trim">true</param>
             <message>密码不能为空!</message>
         </field-validator>
         <field-validator type="regex">
             <param name="expression"><![CDATA[(\w{4,8})]]></param>
             <message>密码必须长度为4-8的数字或字母！</message>
         </field-validator>
     </field>

     <field name="repwd">
         <field-validator type="requiredstring" short-circuit="true">
             <param name="trim">true</param>
             <message>重复密码不能为空!</message>
         </field-validator>
         <field-validator type="fieldexpression">
             <param name="expression"><![CDATA[(repwd==user.pwd)]]></param>
             <message>两次输入的密码要一致!</message>
         </field-validator>
     </field>

 </validators>

　　

 

到这里，我们的项目也差不多完成了，大家自己也尝试一下，开发出自己的J2EE系统。