checkempuser.java

MIS管理系统

package login;

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

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 bean.*;
import database.*;

public class CheckEmpUser extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request,response);
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException 
			{
	String username=request.getParameter("empno");//读JSP中"username"文本框中传送过来的数据.
	String password = request.getParameter("psw");
	String vcode=request.getParameter("vcode");
	String vcode_real=(String)request.getSession().getAttribute("vcode");//读验证码
	HttpSession session = request.getSession();//创建session对象；
	if(username.equals(""))//验证用户名是否为空.
		{
		session.setAttribute("usernamenull","1");
		response.sendRedirect("/software/login.jsp");
		}
	else if (password.equals(""))//验证密码是否为空
		{
		session.setAttribute("passwordnull","1");
		response.sendRedirect("/software/login.jsp");
		}
	else if (vcode.equals(""))//验证验证码是否为空	
		{
		session.setAttribute("vcodenull","1");
		response.sendRedirect("/software/login.jsp");
		}
	else if(vcode.equals(vcode_real))//验证验证码是否正确
    {	
	DB db = new DB();
	Emp emp = new Emp();
	emp.setEmpno(username);
	emp.setPsw(password);
	if(new DB().checkEmp(emp))//验证用户名密码是否正确.
		{
		ArrayList infolist =db.SearchEmpinfo(username);
		session.setAttribute("emplog",infolist);
		response.sendRedirect("/software/empindex.html");	//登录成功		
		}
	else
		{
		session.setAttribute("logerr","1");
		response.sendRedirect("/software/login.jsp");//登录失败.
		}
    }
    else
    {
    	session.setAttribute("vcodeerr","1");
    	response.sendRedirect("/software/login.jsp");
    }
}
	}