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在jsp中用bean和servlet联合实现用户注册、登录 时间：2004/11/7 3:39:00来源：本站整理作者：蓝点我要评论(0)

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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
用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);
%>

Shopping123

   <%
    if(!login){
   %>

卖场入口
会员
密码
注册

   <%
    }
else
{
   out.println("您好，" + checklogin.getUserName() + "!");
}
   %>

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

Shopping123

Shopping123

会员注册
会员
密码
验证密码
E-mail

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();
%>

Shopping123