src/servlet/AdminLoginServlet.java

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package servlet;

import java.io.IOException;
import java.util.ArrayList;

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

import util.Validate;
import bean.SelectBean;

public class AdminLoginServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public AdminLoginServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}
	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		Validate vd = new Validate();
		String name = vd.getUnicode(request.getParameter("name"));
		String pwd = vd.getUnicode(request.getParameter("pwd"));
		String str = "";
		
		SelectBean sb = new SelectBean();
		String sql = "select * from admin where name='"+name+"' and pwd='"+pwd+"'";
		String[] args = {"id","name","pwd"};
		ArrayList admin = sb.select(args, sql);
		
		if(admin != null && admin.size() != 0){
			str = "/modifypwd.jsp";
			HttpSession session = request.getSession();
			session.setAttribute("login", admin);
			session.setAttribute("aname", name);
			session.setAttribute("pwd", pwd);
		}else{
			str = "/index.jsp";
			request.setAttribute("error", "1");
		}

		RequestDispatcher rd=request.getRequestDispatcher(str);
		rd.forward(request,response);
	}