请问各位老大怎么在下面这个CLASS里加入关闭数据库连接的语句,而在jsp里又怎么调用这个关闭连接的函数?

请问各位老大怎么在下面这个CLASS里加入关闭数据库连接的语句,而在jsp里又怎么调用这个关闭连接的函数?
package WebMailservlet;
import java.io.PrintStream;
import java.sql.*;

public class conn
{

String sDBDriver;
String sConnStr;
Connection connect;
ResultSet rs;

public conn()
{
sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
sConnStr = "jdbc:odbc:WEBMAIL";
connect = null;
rs = null;
try
{
Class.forName(sDBDriver);
}
catch(ClassNotFoundException e)
{
System.err.println(e.getMessage());
}
}

public ResultSet executeQuery(String sql)
{
rs = null;
String user = "sa";
String pwd = "szitsa";
try
{
connect = DriverManager.getConnection(sConnStr, user, pwd);
Statement stmt = connect.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex)
{
System.err.println(ex.getMessage());
}
return rs;
}
}