login.java

该源代码实现了系统的进货

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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 operation.LoginOperation;

public class Login extends HttpServlet
{

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

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy()
	{
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @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 doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
		doPost(request,response);
	}

	/**
	 * 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
	{
		request.setCharacterEncoding("GB2312");
		response.setContentType("text/html;charset=gb2312");
		PrintWriter out=response.getWriter();
		HttpSession session=request.getSession();
		session.setMaxInactiveInterval(7200);
		String employeeClass = "";
		try
		{
			String userID = request.getParameter("userID");
			String password = request.getParameter("password");
			LoginOperation operation = new LoginOperation();
			employeeClass = operation.Check(userID, password);
			if (employeeClass.equals(""))//判断员工是否存在
			{
				
				
				System.out.println("-----------------");
				out.println("<script>alert('员工不存在');window.location.href='login.jsp';</script>");
				out.close();
			}
			else if (employeeClass.equals("一级"))//判断用户等级
			{
				
				session.setAttribute("userID",userID);
				//request.setAttribute("userID",userID);
				//request.setAttribute("class", employeeClass);
				RequestDispatcher requestDispatcher = request.getRequestDispatcher("maojin.jsp");
				requestDispatcher.forward(request,response);
			}
			else if(employeeClass.equals("二级"))
			{
				session.setAttribute("userID",userID);
				//request.setAttribute("userID",userID);
				//request.setAttribute("class", employeeClass);
				RequestDispatcher requestDispatcher = request.getRequestDispatcher("maojin2.jsp");
				requestDispatcher.forward(request,response);
			}
			else
			{
				out.println("<script>alert('用户名密码不匹配！');window.location.href='login.jsp';</script>");
				out.close();
			}
			operation.close();
		}
		catch(Exception e)
		{
			System.out.println("loginservlet");
			e.printStackTrace();
		}
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException
	{
		// Put your code here
	}

}