loginservlet.java

本网站为学生管理网站

package students;

import students.Login;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class for Servlet: LoginServlet
 *
 */
 public class LoginServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
   static final long serialVersionUID = 1L;
   
    /* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#HttpServlet()
	 */
	public LoginServlet() {
		super();
	}   	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(request,response);
	}  	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String studentid = (String)request.getParameter("studentid");
		String password = (String)request.getParameter("password");
		int result = Login.checkUser(studentid,password);
		if (result == 1){
			response.sendRedirect("login.jsp?msg=1");
		} else if (result == 2){
			response.sendRedirect("login.jsp?msg=2");
		} else if (result == 3){
			HttpSession session = request.getSession();
			session.setAttribute("username",studentid);
			response.sendRedirect("welcome.jsp");
		} else {
			response.sendRedirect("login.jsp?msg=0");
		}
		
		
		
		
	}   	  	    
}