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在jsp中用bean和servlet联合实现用户注册、登录

关注+2004-11-07作者:蓝点

声明:作者原创,版权所有。未经授权,不得转载
在jsp中用bean和servlet联合实现用户注册、登录


作者:imagebear
版权:imagebear


本例需要的软件和运行环境:
1、Windows2000 Server操作系统
2、jdk1.4
3、JCreator2.5(java源码编辑调试器,吐血推荐!)
4、Macromedia JRun MX
5、Macromedia Dreamweaver MX(非必需)
6、MySQL数据库(最好安装MySQL Control Center)


一、数据库设计
MySQL Control Center打开MySQL数据库,新建数据库shopping,在其下新建表tbl_user,其中各字段设置如下:



二、编写连接数据库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);//加载数据库驱动程序
   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());
  }
 }


                //执行查询操作
 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;
  }
 }


                //执行数据的插入、删除、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;
  }
 }


                //结果集指针跳转到某一行
 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;
  }
 }


                //此方法用于获取大段文本,
                //将其中的回车换行替换为

                //输出到html页面
 public String rs_getHtmlString(String column)
 {
  try{
   String str1 = this.rs.getString(column);
   String str2 = "\r\n";
   String str3 = "
";
   return this.replaceAll(str1,str2,str3);
  }catch(SQLException e){
   System.out.println(e.toString());
   return null;
  }
 }
 
                //把str1字符串中的str2字符串替换为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;
  }
 }


                //判断结果集中是否有数据
 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,调试用
 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());
  }
 }
 
}


声明:因为使用的是MySQL数据库,所以需要MySQL数据库的驱动
下载后请将org包放至DBConn.java所在目录下
以确保该bean能正常运行


 


三、编写用户注册的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("密码中含有非法字符!");
    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("两次输入的密码不一致!");
    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("用户名已存在,请选择其它的用户名!");
    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());
  }
 }
};


说明:
1、该bean文件应和上文所述DBConn.class文件放于同一目录下
2、本例主要研究注册的过程,其中的Email检测等方法并不完善,若要应用请自行设计方法


 



四、编写用户登陆的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  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"));
 }
 
}


说明:
1、默认的jdk1.4中并没有servlet包,请至sun公司网页下载servlet.jar,放至jdk目录下的jre\lib\目录下,并在JCreator中设置jdk处添加servlet.jar包 


2、本Servlet用于检验用户名和密码,若正确则将用户名写入Cookie,完成后将当前页重定向到index.jsp页


 



五、编写检测用户是否已经登陆的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("登陆失败!");
   return false;
   }
  
 }
 
 public String getUserName()
 {
  return this.username;
 }
 
 public static String getCookieValue(Cookie[] cookies,String cookieName,String defaultValue)
 {
  for(int i=0;i  Cookie cookie = cookies[i];
  if (cookieName.equals(cookie.getName()))
  return(cookie.getValue());
 }
  return(defaultValue);
 }
}


说明:此bean检测cookie中的username,若不为空则说明已登录,反之说明没有登录。方法不够完善,您可以自行扩充。


 



六、在JRun中建立shopping服务器
打开JRun Administrator,新建shopping服务器,这里端口为8101。
将上文所述所有编译后的class文件连同org包拷至JRun的shopping服务器所在目录中的classes文件夹下,路径为:



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


七、建立jsp文件
应用DW,在C:\JRun4\servers\shopping\default-ear\default-war\目录下新建如下的jsp文件:
index.jsp:



<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %>


Shopping123





<%
 boolean login = checklogin.check(request,response);
%>


 
   
 
 
   
 
   
 
   
 
 
   
 

       
         
         
         
       
     
&nbsp;Shopping123&nbsp;

       
         
       
     
&nbsp;

   <%
    if(!login){
   %>
     
  
       
         
       
       
         
         
       
       
         
         
       
       
         
         
       
 
     
卖场入口
会员
密码
注册

   <%
    }
  else
  {
   out.println("您好," + checklogin.getUserName() + "!");
  }
   %>
  
&nbsp;&nbsp;
copyright&copy; 2003 Shopping123




reg.jsp<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %>


Shopping123





 
   
 
 
   
   
   
   
   
 
 
   
 

       
         
         
         
       
     
&nbsp;Shopping123&nbsp;
&nbsp;
       
         
       
     
&nbsp;

     
  
       
         
       
       
         
         
       
       
         
         
       
       
         
         
       
       
         
         
       
       
         
         
       
 
     
会员注册
会员
密码
验证密码
E-mail
&nbsp;
copyright&copy; 2003 Shopping123



 regpost.jsp:注册表单提交页面<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %>
<%@ page import="reg"%>


Shopping123




<%
 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();
%>

 
   
 
 
   
   
   
   
   
 
 
   
 

       
         
         
         
       
     
&nbsp;Shopping123&nbsp;
&nbsp;

       
         
       
     
&nbsp;


<%
 if(regID.reg(username,password,confirm,email))
 {
  out.print("ok");
  String newID = regID.getID() + "";
%>
     
       
         
       
       
         
         
       
       
         
         
       
       
         
         
       
       
         
         
       
     
恭喜您,注册成功!
编号<%=newID%>
会员<%=username%>
密码<%=password%>
E-mail<%=email%>

<%
  out.print("
");
  out.print("关闭");
 }else{
  out.print("注册失败!
");
  out.print("该用户名已有人使用,请使用另外的用户名!");
  out.print("返回");
 }
%>
  
&nbsp;
copyright&copy; 2003 Shopping123



 至此,我们已经完成了一个用户注册、登录的系统。 因为这是本人自己边学边做完成的,所以代码一定有很多不完善的地方,欢迎大家批评指正。 以上所有代码均经本人测试通过。


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