JSP connects Oralce database and displays records

JSP tutorial connecting to the Oralce database tutorial and displaying records

public class Userdao {
PRIVATE Connection conn = null;
private Statement st = null;

Public Userdao () {

try {
Class.forName ("Oracle.jdbc.driver.OracleDriver"). newinstance ();
conn = DriverManager
. getconnection
("Jdbc:oracle:thin:@192.168.1.107:1521:zhuh",
"Zucc", "123456");
catch (Exception ex) {
Ex.printstacktrace ();
}
}

Public synchronized void release () {
if (St!= null) {
try {
St.close ();
catch (Exception e) {
}
}

IF (conn!= null) {
try {
Conn.close ();
catch (Exception e) {
}
}

 }
  Public Synchronized boolean checkuser (Actfrmusers user) throws exception{
  Boolean bl=false;
&nb Sp try{
  st = conn.createstatement ()//This sentence is placed here
  ResultSet rs=st.executequery ("SELECT * from users");
  while (Rs.next ()) {
 
  System.out.print ("QW");
 }
 
  catch (Except Ion ex) {
  ex.printstacktrace ();
  throw new Exception ("Database query Error");
 }
  return BL;
 }
}