check.jsp

仿校内网站

<%@page   contentType="texthtml;charset=utf-8"   errorPage=""%>   
<%request.setCharacterEncoding("GBK");%>   
<%@page import="ArticleSharing.DBTools"%>   
<%@page   import="java.sql.*"%>   
<%
            String user_name = request.getParameter("user_name");
            DBTools tool = new DBTools();
            String sql = "select   *   from   users   where   user_name='" + user_name + "'";
            ResultSet rs = null;
            rs = tool.excuteQuery(sql);

            if (rs != null) 
                if (rs.next()) 
                    out.println("用户名已经被注册，请更换一个用户名。");
                else 
                    out.println("用户名尚未被使用，您可以继续。");
%>