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(2)  {
  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;