public boolean checklogin(String Username,String Password) {
        String url = "jdbc:mysql://localhost/jspwork";
        String userName = "root";
        String password = "root";
        String sql = null;
        Connection conn = null;
        Statement stmt = null;
        String s;
        boolean bool=false;
        try {
            //第一步：加载驱动器
            Class.forName("com.mysql.jdbc.Driver");
        } catch(ClassNotFoundException e) {
            System.err.print("ClassNotFoundException");
        }
        
        try {
            //第二步：调用DriverManager.getConnection静态方法得到数据库连接
            conn = DriverManager.getConnection(url, userName, password);
            //创建Statement语句
            stmt = conn.createStatement();
            sql =" select * from userfo where username="+"\'"+Username+"\'";
            //使用Statement语句对象执行SQL语句            
            ResultSet rs=stmt.executeQuery(sql);
            while(rs.next()){
                s=rs.getString(2);
                if(s==Password){
                    bool=true;
                }
            }        
        } catch(SQLException e) {
//            System.err.println("Query SQLException");
        } finally {
            //关闭语句和数据库连接
            try {
                stmt.close();
                conn.close();
            } catch(SQLException e) {
                System.err.println("Close SQLException");
            }        
        }
        return bool;
    }

谢谢你们啊，我已经解决了，还是不熟练啊