用单例连接oracle数据库

package dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DbUser {
    private String driver="oracle.jdbc.driver.OracleDriver";
    private String user="scott";
    private String url="jdbc:oracle:thin:@127.0.0.1:1521:orcl";
    private String password="ztoracle";
    private static DbUser dbuser;
    private Connection conn;
    private DbUser(){
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static DbUser getDbUser(){
        if(dbuser==null){
            DbUser dbuser=new DbUser();
        }
        return dbuser;
    }
    public Connection getconnection(){
        
            try {
                conn=DriverManager.getConnection(url, user, password);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        
        return conn;
        
    }
}