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在jsp中用bean與servlet聯(lián)合完成用戶注冊、登錄

在jsp中用bean與servlet聯(lián)合完成用戶注冊、登錄

更新時(shí)間：2022-07-27 文章作者：未知 信息來源：網(wǎng)絡(luò) 閱讀次數(shù)：次

聲明：作者原創(chuàng)，版權(quán)所有。未經(jīng)授權(quán)，不得轉(zhuǎn)載
在jsp中用bean和servlet聯(lián)合實(shí)現(xiàn)用戶注冊、登錄

作者：imagebear
版權(quán)：imagebear

本例需要的軟件和運(yùn)行環(huán)境：
1、Windows2000 Server操作系統(tǒng)
2、jdk1.4
3、JCreator2.5（java源碼編輯調(diào)試器，吐血推薦！）
4、Macromedia JRun MX
5、Macromedia Dreamweaver MX（非必需）
6、MySQL數(shù)據(jù)庫（最好安裝MySQL Control Center）

一、數(shù)據(jù)庫設(shè)計(jì)
用MySQL Control Center打開MySQL數(shù)據(jù)庫，新建數(shù)據(jù)庫shopping，在其下新建表tbl_user，其中各字段設(shè)置如下：


二、編寫連接數(shù)據(jù)庫bean：DBConn.java


//DBConn.java

//include required classes
import java.sql.*;

//==========================================
// Define Class DBConn
//==========================================
public class DBConn
{
 public String sql_driver = "org.gjt.mm.mysql.Driver";
 public String sql_url = "jdbc:mysql://localhost:3306";
 public String sql_DBName = "shopping";
 public String user = "sa";
 public String pwd = ";

 Connection conn = null;
 Statement stmt = null;
 ResultSet rs = null;

 public boolean setDriver(String drv)
 {
  this.sql_driver = drv;
  return true;
 }

 public String getDriver()
 {
  return this.sql_driver;
 }

 public boolean setUrl(String url)
 {
  this.sql_url = url;
  return true;
 }

 public boolean setDBName(String dbname)
 {
  this.sql_DBName = dbname;
  return true;
 }

 public String getDBName()
 {
  return this.sql_DBName;
 }

 public boolean setUser(String user)
 {
  this.user = user;
  return true;
 }

 public String getUser()
 {
  return this.user;
 }

 public boolean setPwd(String pwd)
 {
  this.pwd = pwd;
  return true;
 }

 public String getPwd()
 {
  return this.pwd;
 }

 public DBConn()
 {
  try{
   Class.forName(sql_driver);//加載數(shù)據(jù)庫驅(qū)動程序
   this.conn = DriverManager.getConnection(sql_url + "/" + sql_DBName + "?user=" + user + "&password=" + pwd + "&useUnicode=true&characterEncoding=gb2312");
   this.stmt = this.conn.createStatement();
  }catch(Exception e){
   System.out.println(e.toString());
  }
 }

                //執(zhí)行查詢操作
 public ResultSet executeQuery(String strSql)
 {
  try{
   this.rs = stmt.executeQuery(strSql);
   return this.rs;
  }catch(SQLException e){
   System.out.println(e.toString());
   return null;
  }catch(NullPointerException e){
   System.out.println(e.toString());
   return null;
  }
 }

                //執(zhí)行數(shù)據(jù)的插入、刪除、修改操作
 public boolean execute(String strSql)
 {
  try{
   if(this.stmt.executeUpdate(strSql) == 0)
    return false;
   else
    return true;
  }catch(SQLException e){
   System.out.println(e.toString());
   return false;
  }catch(NullPointerException e){
   System.out.println(e.toString());
   return false;
  }
 }

                //結(jié)果集指針跳轉(zhuǎn)到某一行
 public boolean rs_absolute(int row)
 {
  try{
   this.rs.absolute(row);
   return true;
  }catch(SQLException e){
   System.out.println(e.toString());
   return false;
  }
 }

 public void rs_afterLast()
 {
  try{
   this.rs.afterLast();
  }catch(SQLException e){
   System.out.println(e.toString());
  }
 }

 public void rs_beforeFirst()
 {
  try{
   this.rs.beforeFirst();
  }catch(SQLException e){
   System.out.print(e.toString());
  }
 }

 public void rs_close()
 {
  try{
   this.rs.close();
  }catch(SQLException e){
   System.out.print(e.toString());
  }
 }

 public void rs_deleteRow()
 {
  try{
   this.rs.deleteRow();
  }catch(SQLException e){
   System.out.print(e.toString());
  }
 }

 public boolean rs_first()
 {
  try{
   this.rs.first();
   return true;
  }catch(SQLException e){
   System.out.print(e.toString());
   return false;
  }
 }

 public String rs_getString(String column)
 {
  try{
   return this.rs.getString(column);
  }catch(SQLException e){
   System.out.println(e.toString());
   return null;
  }
 }

                //此方法用于獲取大段文本，
                //將其中的回車換行替換為<br>
                //輸出到html頁面
 public String rs_getHtmlString(String column)
 {
  try{
   String str1 = this.rs.getString(column);
   String str2 = "\r\n";
   String str3 = "<br>";
   return this.replaceAll(str1,str2,str3);
  }catch(SQLException e){
   System.out.println(e.toString());
   return null;
  }
 }
 
                //把str1字符串中的str2字符串替換為str3字符串
 private static String replaceAll(String str1,String str2,String str3)
 {
  StringBuffer strBuf = new StringBuffer(str1);
     int index=0;
  while(str1.indexOf(str2,index)!=-1)
  {
   index=str1.indexOf(str2,index);
   strBuf.replace(str1.indexOf(str2,index),str1.indexOf(str2,index)+str2.length(),str3);
   index=index+str3.length();

    str1=strBuf.toString();
  }
  return strBuf.toString();
 }

 public int rs_getInt(String column)
 {
  try{
   return this.rs.getInt(column);
  }catch(SQLException e){
   System.out.println(e.toString());
   return -1;
  }
 }

 public int rs_getInt(int column)
 {
  try{
   return this.rs.getInt(column);
  }catch(SQLException e){
   System.out.println(e.toString());
   return -1;
  }
 }

 public boolean rs_next()
 {
  try{
   return this.rs.next();
  }catch(SQLException e){
   System.out.println(e.toString());
   return false;
  }
 }

                //判斷結(jié)果集中是否有數(shù)據(jù)
 public boolean hasData()
 {
  try{
   boolean has_Data = this.rs.first();  
   this.rs.beforeFirst();
   return has_Data;
  }catch(SQLException e){
   System.out.println(e.toString());
   return false;
  }
 }

 public boolean rs_last()
 {
  try{
   return this.rs.last();
  }catch(SQLException e){
   System.out.println(e.toString());
   return false;
  }
 }

 public boolean rs_previous()
 {
  try{
   return this.rs.previous();
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
  }
 }

                //main方法，調(diào)試用
 public static void main(String args[])
 {
  try{
   DBConn myconn = new DBConn();
   //myconn.setDBName("shopping");
   //myconn.DBConn();
   //myconn.execute("Insert Into tbl_test(id,name) values('10','shandaer')");
   //myconn.execute("Update tbl_test set name='yyyyyyyyyyyy' where id=10");
   //myconn.execute("Delete from tbl_test where id=1");
   ResultSet rs = myconn.executeQuery("select * from tbl_user order by id desc limit 1");
   //boolean hasData = myconn.hasData();
   //System.out.println("has data:" + hasData);
   //rs.first();
   while (myconn.rs.next()) 
   {
    int id = myconn.rs_getInt("id") + 1;
    System.out.print(id);
    System.out.println(myconn.rs_getInt("id") + myconn.rs_getString("name"));
   
    //System.out.println('\n' + myconn.rs_getHtmlString("name"));
    //System.out.println(myconn.rs.getString("name") + myconn.rs_getInt(1));
   }
  }catch(Exception e){
   System.err.println(e.toString());
  }
 }
 
}

聲明：因?yàn)槭褂玫氖荕ySQL數(shù)據(jù)庫，所以需要MySQL數(shù)據(jù)庫的驅(qū)動
下載后請將org包放至DBConn.java所在目錄下
以確保該bean能正常運(yùn)行

 

三、編寫用戶注冊的bean：reg.java


//reg.java

//import required classes
import java.sql.*;

public class reg
{
 public int newID = 0;
 public boolean result = false;
 public boolean reg(String username,String password,String confirm,String email)
 {
  try{
   if(!this.checkUser(username))
    return false;
   if(!this.checkPwd(password))
    return false;
   if(!this.verifyPwd(password,confirm))
    return false;
   if(!this.checkEmail(email))
    return false;
   if(!this.userNotExit(username))
    return false;
   this.getNewID(); 
   this.result = this.register(username,password,confirm,email);
   return this.result;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
  }
 }//End boolean reg
 
 public boolean checkUser(String user)
 {
  try{  
   if(user.indexOf("'")!=-1)
   {
    System.out.println("姓名中含有非法字符！");
    return false;
   }else
    return true;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
   }
 }
 
 public boolean checkPwd(String pwd)
 {
  try{
   if(pwd.indexOf("'")!=-1)
   {
    System.out.println("密碼中含有非法字符！");
    return false;
   }else
    return true;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
  }
 }
 
 public boolean verifyPwd(String pwd,String confirm)
 {
  try{
   if(!pwd.equals(confirm))
   {
    System.out.println("兩次輸入的密碼不一致！");
    return false;
   }else
    return true;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
  }
 }
 
 public boolean checkEmail(String email)
 {
  try{
   if(email.indexOf("'")!=-1)
   {
    System.out.println("E-mail中含有非法字符！");
    return false;
   }else
    return true;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
  }
 }
 
 public boolean userNotExit(String user)
 {
  try{
   DBConn userDBConn = new DBConn();
   userDBConn.executeQuery("select * from tbl_user where name='" + user + "'");
   if(userDBConn.rs_next())
   {
    System.out.println("用戶名已存在，請選擇其它的用戶名！");
    return false;
   }else
    return true;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
   }
 }
 
 public int getNewID()
 {
  try{
   DBConn newIDDBConn = new DBConn();
   newIDDBConn.executeQuery("select * from tbl_user order by id desc limit 1");
   if(newIDDBConn.rs_next())
   {
    this.newID = newIDDBConn.rs_getInt("id") + 1;
    System.out.println(this.newID);
   }else{
    this.newID = 1;
   }
   return this.newID;
  }catch(Exception e){
   System.out.println(e.toString());
   return -1;
   }   
 }
 
 public int getID()
 {
  return this.newID;
 }
 
 public boolean register(String username,String password,String confirm,String email)
 {
  try{
   DBConn regDBConn = new DBConn();
   String strSQL = "insert into tbl_user(id,name,pwd,email) values('" + this.newID +"','" + username + "','" + password + "','" + email + "')";
   regDBConn.execute(strSQL);
   return true;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
   }
 }

 public static void main(String args[])
 {
  try{
  
   reg newreg = new reg();  
  
   System.out.println(newreg.reg("sssssssss","ssssss","ssssss","imagebear@163.com"));
  
   DBConn myconn = new DBConn();
   myconn.executeQuery("select * from tbl_user");
   while(myconn.rs_next())
   {
    System.out.println(myconn.rs_getInt("id") + "    " + myconn.rs_getString("name") + "    " + myconn.rs_getString("pwd") + "    " + myconn.rs_getString("email"));
   }
   System.out.println(newreg.getID());
  }catch(Exception e){
   System.err.println(e.toString());
  }
 }
};

說明：
1、該bean文件應(yīng)和上文所述DBConn.class文件放于同一目錄下
2、本例主要研究注冊的過程，其中的Email檢測等方法并不完善，若要應(yīng)用請自行設(shè)計(jì)方法

 


四、編寫用戶登陸的Servlet：login.java


//login.java

//import required classes
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

//class login
public class login extends HttpServlet
{
 public void doGet(HttpServletRequest req,HttpServletResponse res)
 throws IOException,ServletException
 {
  String username = req.getParameter("username");
  String password = req.getParameter("password");
  if(this.checklogin(username,password))
  {
   Cookie mylogin = new Cookie("username",username);
   mylogin.setVersion(1);
   mylogin.setPath("/");
   mylogin.setComment("Your login username");
   res.addCookie(mylogin);
  }
  //Cookie[] myCookies = req.getCookies();
  //String nameValue = this.getCookieValue(myCookies,"username","not found");
  //PrintWriter out = res.getWriter();
  //out.println("username" + ":" + nameValue);
  //out.println("Test Cookie Success!");
  res.sendRedirect("/index.jsp");
 }
 
 public void doPost(HttpServletRequest req,HttpServletResponse res)
 throws IOException,ServletException
 {
  doGet(req,res);
 }
 
 public static String getCookieValue(Cookie[] cookies,String cookieName,String defaultValue)
 {
  for(int i=0;i<cookies.length;i++) {
  Cookie cookie = cookies[i];
  if (cookieName.equals(cookie.getName()))
  return(cookie.getValue());
 }
  return(defaultValue);
 }


 
 public boolean checklogin(String username,String password)
 {
  try{
   DBConn loginConn = new DBConn();
   loginConn.executeQuery("select * from tbl_user where name='" + username + "'");
   if(loginConn.rs_next())
   {
    System.out.println("Connection created!");
    if(loginConn.rs_getString("pwd").trim().equals(password))
    {
     System.out.println(loginConn.rs_getString("name"));
     return true;
    }
    else
    {
     return false;
    }
   }
   System.out.println("Test Login Success!");
   return false;
  }catch(Exception e){
   System.out.println(e.toString());
   return false;
   }
 }
 
 public static void main(String args[])
 {
  login mylogin = new login();
  System.out.println(mylogin.checklogin("shandong","shandong"));
 }
 
}

說明：
1、默認(rèn)的jdk1.4中并沒有servlet包，請至sun公司網(wǎng)頁下載servlet.jar，放至jdk目錄下的jre\lib\目錄下，并在JCreator中設(shè)置jdk處添加servlet.jar包 

2、本Servlet用于檢驗(yàn)用戶名和密碼，若正確則將用戶名寫入Cookie，完成后將當(dāng)前頁重定向到index.jsp頁

 


五、編寫檢測用戶是否已經(jīng)登陸的bean：checkLogin.java

//checkLogin.java

//import required classes
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

//class checkLogin
public class checkLogin
{
 public String username = ";
 
 public boolean check(HttpServletRequest req,HttpServletResponse res)
 throws IOException,ServletException
 {
  String cookieName = "username";
  Cookie[] myCookies = req.getCookies();
  this.username = this.getCookieValue(myCookies,cookieName,"not found");
  PrintWriter out = res.getWriter();
  if(this.username != null)
  {  
   //out.println("早上好，" + this.username + "！");
   return true;
  }else{
   out.println("登陸失敗！");
   return false;
   }
  
 }
 
 public String getUserName()
 {
  return this.username;
 }
 
 public static String getCookieValue(Cookie[] cookies,String cookieName,String defaultValue)
 {
  for(int i=0;i<cookies.length;i++) {
  Cookie cookie = cookies[i];
  if (cookieName.equals(cookie.getName()))
  return(cookie.getValue());
 }
  return(defaultValue);
 }
}

說明：此bean檢測cookie中的username，若不為空則說明已登錄，反之說明沒有登錄。方法不夠完善，您可以自行擴(kuò)充。

 


六、在JRun中建立shopping服務(wù)器
打開JRun Administrator，新建shopping服務(wù)器，這里端口為8101。
將上文所述所有編譯后的class文件連同org包拷至JRun的shopping服務(wù)器所在目錄中的classes文件夾下，路徑為：


C:\JRun4\servers\shopping\default-ear\default-war\WEB-INF\classes\

七、建立jsp文件
應(yīng)用DW，在C:\JRun4\servers\shopping\default-ear\default-war\目錄下新建如下的jsp文件：
index.jsp：


<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %>
<html>
<head>
<title>Shopping123</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="styles/shoppingstyle.css" rel="stylesheet" type="text/css">
</head>
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0">
<jsp:useBean id="checklogin" class="checkLogin" scope="page"/>
<%
 boolean login = checklogin.check(request,response);
%>
<table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
  <tr bgcolor="#990000">
    <td height="80" colspan="5"><table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
        <tr>
          <td width="120">&nbsp;</td>
          <td class="caption">Shopping123</td>
          <td width="200">&nbsp;</td>
        </tr>
      </table></td>
  </tr>
  <tr>
    <td width="200" align="center" valign="top"><table width="100%" height="20" border="0" cellpadding="0" cellspacing="0">
        <tr>
          <td>&nbsp;</td>
        </tr>
      </table>
   <%
    if(!login){
   %>
      <table width="90%" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
   <form name="form1" method="post" action="/servlet/login">
        <tr align="center" bgcolor="#CCCCCC">
          <td height="30" colspan="2" class="deepred">賣場入口</td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">會員</td>
          <td align="center" bgcolor="#FFFFFF"><input name="username" type="text" id="username" size="10"></td>
        </tr>
        <tr>
          <td height="24" align="center" bgcolor="#FFFFFF">密碼</td>
          <td align="center" bgcolor="#FFFFFF"><input name="password" type="text" id="password" size="10"></td>
        </tr>
        <tr>
          <td height="24" align="center" bgcolor="#FFFFFF"><a href="reg.jsp" target="_blank" class="red">注冊</a></td>
          <td align="center" bgcolor="#FFFFFF"><input type="submit" name="Submit" value="進(jìn)入"></td>
        </tr>
  </form>
      </table>
   <%
    }
  else
  {
   out.println("您好，" + checklogin.getUserName() + "!");
  }
   %>
   </td>
 <td width="1" valign="top" bgcolor="#CCCCCC"></td>
    <td width="400">&nbsp;</td>
 <td width="1" valign="top" bgcolor="#CCCCCC"></td>
    <td width="200">&nbsp;</td>
  </tr>
  <tr align="center" bgcolor="#990000">
    <td height="60" colspan="5" class="white">copyright&copy; 2003 Shopping123</td>
  </tr>
</table>
</body>
</html>


reg.jsp<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %>
<html>
<head>
<title>Shopping123</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="styles/shoppingstyle.css" rel="stylesheet" type="text/css">
</head>
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0">
<table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
  <tr bgcolor="#990000">
    <td height="80" colspan="5"><table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
        <tr>
          <td width="120">&nbsp;</td>
          <td class="caption">Shopping123</td>
          <td width="200">&nbsp;</td>
        </tr>
      </table></td>
  </tr>
  <tr>
    <td width="100" align="center" valign="top">&nbsp;</td>
    <td width="1" valign="top"></td>
    <td width="400" align="center" valign="top"><table width="100%" height="20" border="0" cellpadding="0" cellspacing="0">
        <tr>
          <td>&nbsp;</td>
        </tr>
      </table>
      <table width="100%" border="0" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
   <form action="regpost.jsp" method="post" name="form1">
        <tr align="center">
          <td height="30" colspan="2" bgcolor="#CCCCCC" class="deepred">會員注冊</td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">會員</td>
          <td align="center" bgcolor="#FFFFFF"><input name="username" type="text" id="username" size="16"></td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">密碼</td>
          <td align="center" bgcolor="#FFFFFF"><input name="password" type="password" id="password" size="16"></td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">驗(yàn)證密碼</td>
          <td align="center" bgcolor="#FFFFFF"><input name="confirm" type="password" id="confirm" size="16"></td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">E-mail</td>
          <td align="center" bgcolor="#FFFFFF"><input name="email" type="text" id="email" size="16"></td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF"><input type="submit" name="Submit" value="重寫"></td>
          <td align="center" bgcolor="#FFFFFF"><input type="submit" name="Submit2" value="注冊"></td>
        </tr>
  </form>
      </table></td>
    <td width="1" valign="top"></td>
    <td width="100">&nbsp;</td>
  </tr>
  <tr align="center" bgcolor="#990000">
    <td height="60" colspan="5" class="white">copyright&copy; 2003 Shopping123</td>
  </tr>
</table>
</body>
</html>
 regpost.jsp：注冊表單提交頁面<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %>
<%@ page import="reg"%>
<html>
<head>
<title>Shopping123</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="styles/shoppingstyle.css" rel="stylesheet" type="text/css">
</head>
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0">
<%
 String username = new String(request.getParameter("username").getBytes("ISO8859_1")).trim();
 String password = new String(request.getParameter("password").getBytes("ISO8859_1")).trim();
 String confirm = new String(request.getParameter("confirm").getBytes("ISO8859_1")).trim();
 String email = new String(request.getParameter("email").getBytes("ISO8859_1")).trim();
%>
<table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
  <tr bgcolor="#990000">
    <td height="80" colspan="5"><table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
        <tr>
          <td width="120">&nbsp;</td>
          <td class="caption">Shopping123</td>
          <td width="200">&nbsp;</td>
        </tr>
      </table></td>
  </tr>
  <tr>
    <td width="100" align="center" valign="top">&nbsp;</td>
    <td width="1" valign="top"></td>
    <td width="400" align="center" valign="top">
<table width="100%" height="20" border="0" cellpadding="0" cellspacing="0">
        <tr>
          <td>&nbsp;</td>
        </tr>
      </table>
<jsp:useBean id="regID" class="reg" scope="session"/>
<%
 if(regID.reg(username,password,confirm,email))
 {
  out.print("ok");
  String newID = regID.getID() + ";
%>
      <table width="100%" border="0" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
        <tr align="center">
          <td height="30" colspan="2" bgcolor="#CCCCCC" class="deepred">恭喜您，注冊成功！</td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">編號</td>
          <td align="center" bgcolor="#FFFFFF"><%=newID%></td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">會員</td>
          <td align="center" bgcolor="#FFFFFF"><%=username%></td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">密碼</td>
          <td align="center" bgcolor="#FFFFFF"><%=password%></td>
        </tr>
        <tr>
          <td width="50%" height="24" align="center" bgcolor="#FFFFFF">E-mail</td>
          <td align="center" bgcolor="#FFFFFF"><%=email%></td>
        </tr>
      </table>
<%
  out.print("<br>");
  out.print("<a href=javascript:window.close()>關(guān)閉</a>");
 }else{
  out.print("注冊失敗！<br>");
  out.print("該用戶名已有人使用，請使用另外的用戶名！");
  out.print("<a href=javascript:history.go(-1)>返回</a>");
 }
%>
   </td>
    <td width="1" valign="top"></td>
    <td width="100">&nbsp;</td>
  </tr>
  <tr align="center" bgcolor="#990000">
    <td height="60" colspan="5" class="white">copyright&copy; 2003 Shopping123</td>
  </tr>
</table>
</body>
</html>
 至此，我們已經(jīng)完成了一個(gè)用戶注冊、登錄的系統(tǒng)。 因?yàn)檫@是本人自己邊學(xué)邊做完成的，所以代碼一定有很多不完善的地方，歡迎大家批評指正。 以上所有代碼均經(jīng)本人測試通過。

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