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在jsp中用bean和servlet聯合實現用戶注冊、登錄

編輯：關於JSP

聲明：作者原創，版權所有。未經授權，不得轉載
在jsp中用bean和servlet聯合實現用戶注冊、登錄

作者：imagebear
版權：imagebear

本例需要的軟件和運行環境：
1、Windows2000 Server操作系統
2、jdk1.4
3、JCreator2.5（java源碼編輯調試器，吐血推薦！）
4、Macromedia JRun MX
5、Macromedia Dreamweaver MX（非必需）
6、MySQL數據庫（最好安裝MySQL Control Center）

一、數據庫設計
用MySQL Control Center打開MySQL數據庫，新建數據庫shopping，在其下新建表tbl_user，其中各字段設置如下：

二、編寫連接數據庫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);//加載數據庫驅動程序
   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;
}
}

                //執行數據的插入、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;
}
}

                //結果集指針跳轉到某一行
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;
}
}

                //此方法用於獲取大段文本，
                //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;
}
}

                //判斷結果集中是否有數據
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：因為使用的是MySQL數據庫，所以需要MySQL數據庫的驅動
下載後請將org包放至DBConn.java所在目錄下
以確保該bean能正常運行

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","[email protected]"));

   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文件應和上文所述DBConn.class文件放於同一目錄下
2、本例主要研究注冊的過程，其中的Email檢測等方法並不完善，若要應用請自行設計方法

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、默認的jdk1.4中並沒有servlet包，請至sun公司網頁下載servlet.jar，放至jdk目錄下的jre\lib\目錄下，並在JCreator中設置jdk處添加servlet.jar包

2、本Servlet用於檢驗用戶名和密碼，若正確則將用戶名寫入Cookie，完成後將當前頁重定向到index.jsp頁

五、編寫檢測用戶是否已經登陸的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，您可以自行擴充。

六、在JRun中建立shopping服務器
打開JRun Administrator，新建shopping服務器，這裡端口為8101。
將上文所述所有編譯後的class文件連同org包拷至JRun的shopping服務器所在目錄中的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"> </td>
          <td class="caption">Shopping123</td>
          <td width="200"> </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> </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="進入"></td>
        </tr>
</form>
      </table>
   <%
    }
else
{
   out.println("您好，" + checklogin.getUserName() + "!");
}
   %>
   </td>
<td width="1" valign="top" bgcolor="#CCCCCC"></td>
    <td width="400"> </td>
<td width="1" valign="top" bgcolor="#CCCCCC"></td>
    <td width="200"> </td>
</tr>
<tr align="center" bgcolor="#990000">
    <td height="60" colspan="5" class="white">copyright© 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"> </td>
          <td class="caption">Shopping123</td>
          <td width="200"> </td>
        </tr>
      </table></td>
</tr>
<tr>
    <td width="100" align="center" valign="top"> </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> </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"> </td>
</tr>
<tr align="center" bgcolor="#990000">
    <td height="60" colspan="5" class="white">copyright© 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"> </td>
          <td class="caption">Shopping123</td>
          <td width="200"> </td>
        </tr>
      </table></td>
</tr>
<tr>
    <td width="100" align="center" valign="top"> </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> </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"> </td>
</tr>
<tr align="center" bgcolor="#990000">
    <td height="60" colspan="5" class="white">copyright© 2003 Shopping123</td>
</tr>
</table>
</body>
</html>
至此，我們已經完成了一個用戶注冊、登錄的系統。因為這是本人自己邊學邊做完成的，所以代碼一定有很多不完善的地方，歡迎大家批評指正。以上所有代碼均經本人測試通過。