连接JDBC-ODBC异常，请大家进来看看，给小弟帮帮忙啊

连接JDBC-ODBC错误，急啊，请大家进来看看，给小弟帮帮忙啊！！！！！！！在线等
package   dbcon;
import   java.sql.*;
import   java.io.*;
import   java.util.*;
import   javax.servlet.*;
import   javax.servlet.http.*;
import   javax.naming.*;
import   javax.sql.*;

public   class   mydb   {

String   strUser= " ",strPassword= " ";
String   strDbdriver= "sun.jdbc.odbc.JdbcOdbcDriver ";
String   strConstring= "jdbc:odbc:ibbs ";
//String   strDbdriver   =   "org.gjt.mm.mysql.Driver ";
//String   strConstring   =   "jdbc:mysql://localhost:3306/ibbs ";


Connection   conn   =   null;
ResultSet   rs   =   null;

public   mydb()   {
try   {//--read   db   info   from   config   file-------------
                         
Class.forName(strDbdriver);  
}
catch(Exception   e)   {
System.err.println( "mydb():   "   +   e.getMessage());
}
}

//----query------------------
public   ResultSet   executeQuery(String   sql)throws   Exception   {
rs   =   null;
conn   =   DriverManager.getConnection(strConstring,strUser,strPassword);  
Statement   stmt   =   conn.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
rs   =   stmt.executeQuery(sql);
if(rs==null){System.exit(1);}
return   rs;
}
//---Update-------------------
public   void   executeUpdate(String   sql)   {
try   {
conn   =   DriverManager.getConnection(strConstring,strUser,strPassword);  
Statement   stmt   =   conn.createStatement(java.sql.ResultSet.TYPE_SCROLL_SENSITIVE,java.sql.ResultSet.CONCUR_UPDATABLE);
stmt.executeUpdate(sql);
stmt.close();
conn.close();
}  
catch(SQLException   ex)   {  
System.err.println( "aq.executeUpdate:   "   +   ex.getMessage());
  }
}


}


提示错误如下：

javax.servlet.ServletException:   [Microsoft][ODBC   驱动程序管理器]   未发现数据源名称并且未指定默认驱动程序
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.regnew_jsp._jspService(regnew_jsp.java:107)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root   cause  

java.sql.SQLException:   [Microsoft][ODBC   驱动程序管理器]   未发现数据源名称并且未指定默认驱动程序
sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6958)
sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7115)
sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(JdbcOdbc.java:3074)
sun.jdbc.odbc.JdbcOdbcConnection.initialize(JdbcOdbcConnection.java:323)
sun.jdbc.odbc.JdbcOdbcDriver.connect(JdbcOdbcDriver.java:174)
java.sql.DriverManager.getConnection(DriverManager.java:512)
java.sql.DriverManager.getConnection(DriverManager.java:171)
dbcon.mydb.executeQuery(mydb.java:35)