userlistservlet.java

机械工业出版社的《jsp2.0动态网站开发实例指南》的源代码

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

import AccountsPack.Administrator;
import AccountsPack.User;

public class userListServlet extends HttpServlet{
    public void doPost (HttpServletRequest request,
		       HttpServletResponse response) {
        doGet(request, response);

    }

    public void doGet (HttpServletRequest request,
		       HttpServletResponse response) {
        try{
            Administrator user = new Administrator();
            User[] ads = user.GetUserList(User.GRP_ADMINISTRATOR);
            User[] ops = user.GetUserList(User.GRP_OPERATOR);
            User[] cus = user.GetUserList(User.GRP_CUSTOMER);
            int adnum = (ads == null ? 0 : ads.length);
            int opnum = (ops == null ? 0 : ops.length);
            int cunum = (cus == null ? 0 : cus.length);
            int len = adnum + opnum + cunum;
            User[] users = new User[len];
            for ( int i=0; i< len; i++) {
                users[i] = i < adnum ? ads[i] : 
                    (i < opnum + adnum ? ops[i-adnum] :
                        ( i < len ? cus[i-adnum-opnum]: null));
            }
            request.setAttribute("userList", users);
            getServletConfig().getServletContext().getRequestDispatcher("/userlist.jsp").forward(request, response);

        }
        catch(Exception ex){
            ex.printStackTrace();
        }
    }
}