checkaccount.java

大型数据库课程设计源码

package servlet;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class CheckAccount extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String account=request.getParameter("acc").trim();
		if(account.length()==0){
			request.setAttribute("null", "nullerror");
			response.sendRedirect("/netservice/jsp/reg.jsp");
			
		}
			String sql="select * from account where accountnum='"+account+"'";
			db.DBManager.getConnection();
			int i=db.DBManager.executeQuery(sql);
			if(i!=0){
				request.setAttribute("error", "鎮ㄨ緭鍏ョ殑甯愬彿閿欎簡锛