在jsp中用bean和servlet联合实现用户注册、登录

在jsp中用bean和servlet联合实现用户注册、登录(5)    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"));