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在jsp中用bean和servlet聯(lián)合實現(xiàn)用戶注冊、登錄
作者：imagebear
版權(quán)：imagebear
本例需要的軟件和運行環(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
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=truecharacterEncoding=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：因為使用的是MySQL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;icookies.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用于檢驗用戶名和密碼，若正確則將用戶名寫入Cookie，完成后將當前頁重定向到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?。?);
return false;
}
}
public String getUserName()
{
return this.username;
}
public static String getCookieValue(Cookie[] cookies,String cookieName,String defaultValue)
{
for(int i=0;icookies.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(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">copyrightcopy; 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">copyrightcopy; 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">copyrightcopy; 2003 Shopping123/td>
/tr>
/table>
/body>
/html>
至此，我們已經(jīng)完成了一個用戶注冊、登錄的系統(tǒng)。 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(jīng)本人測試通過。
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