JSP+JAVABEAN+SERVLET模式的注册实例实现-阿里云开发者社区

MVC模式即Model-View-Controller模式。

Servlet用来处理请求的事务，充当控制器（Controller即C）的角色，Servlet负责响应用户对业务逻辑的请求并根据用户的请求行为，决定将哪个JSP页面发送给客户。

JSP页面处于表现层，也就是视力（View即V）的角色。

JavaBean则负责数据的处理，也就是模型（Model即M）的角色。

初始的请求由Servlet来处理，Servlet调用商业逻辑和数据处理代码，并创建Bean来表示相应的结果（模型）。然后Servlet确定哪个页面适合于表达这些特定的结果，并将请求转发到相应的页面（JSP页面即为视图），由Servlet确定哪个业务逻辑适用，应该用哪个JSP页面相应结果（Servlet就是控制器）。

注册实例：

配置文件配置SERVLET的调用

/PetStore/WebRoot/WEB-INF/web.xml

<servlet>
<servlet-name>reg</servlet-name>
<servlet-class>cn.wy.CtrlServlet.reg</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>reg</servlet-name>
<url-pattern>/reg</url-pattern>
</servlet-mapping>

前端jsp页面

/PetStore/WebRoot/register.jsp

代码
<%@ page contentType="text/html; charset=gb2312" language="java" import="cn.wy.Pet.User" errorPage="" %>
<jsp:useBean id="user" scope="page" class="cn.wy.Pet.User"/>
<%
//权限默认不是超级管理员
boolean isAdmin = false ;
String actionStr = "";
if (session.getAttribute("user") != null)
{
user = (User)session.getAttribute("user");
//取出权限
if (user.getUPopedom() ==0)
isAdmin = true ;
}
String qFile = request.getRequestURI();
System.out.println(qFile);
//说明是超级管理员，并在后台添加用户
if ("/admin/default.jsp".equals(qFile))
{
actionStr = "../" ;
}
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>宠物商店会员注册</title>
<style type="text/css">
<!--
.STYLE1 {
color: #FF0000;
font-weight: bold;
}
.STYLE2 {color: #FF0000}
.STYLE3 {
font-size: 18px;
font-weight: bold;
}
-->
</style>
</head>
<body style="font-size:12px">
<form id="form1" name="form1" method="post" action="<%=actionStr%>reg">
<p align="center"><br />
<span class="STYLE3">用户注册</span></p>
<table width="582" height="302" border="1" align="center" cellpadding="0" cellspacing="0" bordercolor="#BCACD2">
<tr>
<td width="80" align="right">用户名：</td>
<td width="496" align="left"><input name="userName" type="text" id="userName" size="16" maxlength="16" />
<span class="STYLE1">*</span> 3~16位字母或者数字（如：8hack）</td>
</tr>
<tr>
<td align="right">密码：</td>
<td align="left"><input name="password1" type="text" id="password1" size="16" maxlength="16" />
<span class="STYLE1">* </span> 3~16位字母或者数字（如：abc123）</td>
</tr>
<tr>
<td align="right">确认密码：</td>
<td align="left"><input name="password2" type="text" id="password2" size="16" maxlength="16" />
<span class="STYLE1">*</span> 必须和上面输入的密码相同</td>
</tr>
<tr>
<td align="right">电子邮件：</td>
<td align="left"><input name="email" type="text" id="email" maxlength="20" />
<span class="STYLE1">*</span> 找回密码和联系用（如：8hack@163.com）</td>
</tr>
<tr>
<td align="right">联系电话：</td>
<td align="left"><input name="tel" type="text" id="tel" size="20" maxlength="20" />
如（0871-8888888，13888853113）</td>
</tr>
<tr>
<td align="right">联系地址：</td>
<td align="left"><input name="address" type="text" id="address" maxlength="50" /></td>
</tr>
<%
if (isAdmin)//如果是管理员就显示出下拉列表
{
%>
<tr>
<td height="26" align="right">权限：</td>
<td align="left">
<select name="popedom" id="popedom">
<option value="0">超级管理员</option>
<option value="1">会员</option>
</select>
</td>
</tr>
<%
}else//否则就插入一个蕴藏域
{
%>
<input type="hidden" name="popedom" value="1">
<%
}
%>
<tr>
<td height="42" align="right"> </td>
<td align="left"><span class="STYLE2">为了方便联系和管理请认真填写你的信息，带星号的必须填写</span></td>
</tr>
<tr>
<td height="40" colspan="2" align="center"><input type="submit" name="Submit" value="确认注册" />
    
<input type="reset" name="Submit2" value="重新填写" /></td>
</tr>
</table>
</form>
</body>
</html>

servlet类

/PetStore/src/cn/wy/CtrlServlet/reg.java

代码
package cn.wy.CtrlServlet;
import cn.wy.DBConnection;
import java.io.*;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
// Referenced classes of package cn.wy.CtrlServlet:
// login
public class reg extends HttpServlet
{
public reg()
{
}
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out;
DBConnection dbc=null;
String userName;
String psd;
String email;
String tel;
String address;
int popedom;
response.setContentType("text/html;charset=UTF-8");
out = response.getWriter();
try{
dbc = new DBConnection();
PreparedStatement ps = null;
userName = request.getParameter("userName");
psd = login.encrypt(request.getParameter("password1").toString());
email = request.getParameter("email");
tel = request.getParameter("tel");
address = request.getParameter("address");
popedom = Integer.parseInt(request.getParameter("popedom"));
if (userName != null && psd != null && email != null)
{
ps = dbc.getCon().prepareStatement("insert into [User](UName,Upass,UEmail,UTel,UAddress,UPopedom) values(?,?,?,?,?,?)");
ps.setString(1, userName);
ps.setString(2, psd);
ps.setString(3, email);
ps.setString(4, tel);
ps.setString(5, address);
ps.setInt(6, popedom);
ps.execute();
System.out.print("新用户注册：" + request.getParameter("userName") + " ");
out.print("<script>alert('恭喜您：注册成功！现已经登录到网站！');history.go(-1)</script>");
}
if (dbc != null)
dbc.dbClose();
}
catch(SQLException ex)
{
out.print("<script>alert('注册失败！数据库连接错误！');history.go(-1)</script>");
ex.printStackTrace();
if (dbc != null)
dbc.dbClose();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
processRequest(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
processRequest(request, response);
}
public String getServletInfo()
{
return "Short description";
}
}

数据库连接类

/PetStore/src/cn/wy/DBConnection.java

代码
package cn.wy;
import java.io.PrintStream;
import java.sql.Connection;
import java.sql.DriverManager;
public class DBConnection
{
private String mySqlDriver;
private String mySqlUrl;
private String mdbDrStr;
private String mdbUrl;
long time;
private String SQLDRIVER;
private String SQLURL;
public Connection conn;
boolean Conectde;
public DBConnection()
{
mySqlDriver = "org.gjt.mm.mysql.Driver";
mySqlUrl = "jdbc:mysql://localhost/petstore?user=root&password=5455&useUnicode=true&characterEncoding=8859_1";
mdbDrStr = "sun.jdbc.odbc.JdbcOdbcDriver";
mdbUrl = "jdbc:odbc:pet";
SQLDRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
SQLURL = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=PetStore";
conn = null;
Conectde = false;
time = System.currentTimeMillis();
try
{
Class.forName(SQLDRIVER).newInstance();
if (conn == null)
{
conn = DriverManager.getConnection(SQLURL, "sa", "123456");
Conectde = true;
System.out.print("<");
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
public Connection getCon()
{
return conn;
}
public void dbClose()
{
try
{
if (Conectde)
{
conn.close();
Conectde = false;
System.out.print(System.currentTimeMillis() - time);
System.out.print("> ");
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}

JavaBean类

/PetStore/src/cn/wy/Pet/User.java

代码
package cn.wy.Pet;
public class User
{
private int userID;
private String UName;
private String UPass;
private String UEmail;
private String UTel;
private String UAddress;
private String URegDate;
private String ALastTime;
private int UPopedom;
private int UAppearCount;
private int URestoreCount;
private boolean login;
public User()
{
login = false;
}
public boolean isLogin()
{
return login;
}
public void setLogin(boolean isLogin)
{
login = isLogin;
}
public void setURestoreCount(int URestoreCount)
{
this.URestoreCount = URestoreCount;
}
public int getURestoreCount()
{
return URestoreCount;
}
public void setUAppearCount(int UAppearCount)
{
this.UAppearCount = UAppearCount;
}
public int getUAppearCount()
{
return UAppearCount;
}
public void setUserID(int userID)
{
this.userID = userID;
}
public void setUPopedom(int UPopedom)
{
this.UPopedom = UPopedom;
}
public void setALastTime(String ALastTime)
{
this.ALastTime = ALastTime;
}
public void setURegDate(String URegDate)
{
this.URegDate = URegDate;
}
public void setUAddress(String UAddress)
{
this.UAddress = UAddress;
}
public void setUTel(String UTel)
{
this.UTel = UTel;
}
public void setUEmail(String UEmail)
{
this.UEmail = UEmail;
}
public void setUPass(String UPass)
{
this.UPass = UPass;
}
public void setUName(String UName)
{
this.UName = UName;
}
public int getUserID()
{
return userID;
}
public int getUPopedom()
{
return UPopedom;
}
public String getALastTime()
{
return ALastTime;
}
public String getURegDate()
{
return URegDate;
}
public String getUAddress()
{
return UAddress;
}
public String getUTel()
{
return UTel;
}
public String getUEmail()
{
return UEmail;
}
public String getUPass()
{
return UPass;
}
public String getUName()
{
return UName;
}
}

本文转自linzheng 51CTO博客，原文链接:http://blog.51cto.com/linzheng/1080779

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