loginservlet.java

来自「jsp的课程实践」· Java 代码 · 共 106 行

package StudentCourse.servlets;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
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 student.beans.Student;
import student.dao.StudentDAO;
public class LoginServlet extends HttpServlet {

	private StudentDAO stuDao;
	/**
	 * Constructor of the object.
	 */
	public LoginServlet() {
		super();
		stuDao=new StudentDAO();
	}

	/**
	 * 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 {
		ServletContext sc=this.getServletContext();
        RequestDispatcher rd=null;
        Student student=null;
    	HttpSession session=request.getSession(true);
        String stuNum=request.getParameter("username");
		String password=request.getParameter("password");
		String stuPass=stuDao.getPass(stuNum);
		if(stuPass!=null)
		{
			if(stuPass.equals(password))
			{
				student=stuDao.getStudentInfo(stuNum);
				if(student!=null)
				{
					//request.setAttribute("student", student);
					session.setAttribute("student", student);
					rd=sc.getRequestDispatcher("/studentInfo.jsp");
				}
			}
			//用户的密码错误
			else
			{
				request.setAttribute("error", "用户密码错误!");
				rd=sc.getRequestDispatcher("/error.jsp");
			}
		}
		else
		{
			request.setAttribute("error", "用户名不存在，请您先注册!");
			rd=sc.getRequestDispatcher("/error.jsp");
		}
		rd.forward(request, response);
	}

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

}