JSP + tomcat+Eclipse+J2skd sql2008 connection string and java class operation

package steven;
import java.io.*;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.*;

public class dataop {
    private String className; //撽勗���
    private String url;
    private String username; //��摨�����
    private String password; //��摨����
    private Connection con; //��摨�撖寡情
    private PreparedStatement pstm; //��摨�����笆鞊�
    private Statement stmt;
    private ResultSet rs;
    private String sqlstr;
    private int result1;
   
    public dataop(){
        className="com.microsoft.sqlserver.jdbc.SQLServerDriver";
        url="";
        username="sa";
        password="monfongs@2018";
        try{
            Class.forName(className);
        }catch(ClassNotFoundException e){
            System.out.println("��蝸��摨店�蝔�仃韐伐��");
            e.printStackTrace();
        }
    }

    public void getCon(){
        try {
            con=DriverManager.getConnection("jdbc:sqlserver://10.30.1.122:1433;DatabaseName=MonFongsOA","sa","monfongs@2018");;
            stmt = con.createStatement();
        } catch (SQLException e) {
            System.out.println("����摨�憭梯揖嚗�");
            e.printStackTrace();
        }
      
    }
   
  
   public int  sUpdate(String sqlstr) throws SQLException{   
 
      result1 = stmt.executeUpdate(sqlstr);       
         return result1 ; 
  }
  
   
    public ResultSet getRs(String sqlstr){    
     
        try {   rs = stmt.executeQuery(sqlstr);        
            return rs;
        } catch (SQLException e) {
            System.out.println("DB蝐颱葉��etRs()�瘜����");
            e.printStackTrace();
            return null;
        }
    }   
   
  
   
    public void closed(){
        try{
            if(pstm!=null)
                pstm.close();
        }catch(Exception e){
            System.out.println("��pstm撖寡情憭梯揖嚗�");
        }
        try{
            if(con!=null)
                con.close();
        }catch(Exception e){
            System.out.println("��con撖寡情憭梯揖嚗�");
        }
    }
   

}