admincourseservlet.java

来自「jsp的课程实践」· Java 代码 · 共 94 行

package StudentCourse.servlets;

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

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 course.beans.Course;
import course.dao.StudentCourseDAO;

public class AdminCourseServlet extends HttpServlet {

	private StudentCourseDAO stuCou;
	/**
	 * Constructor of the object.
	 */
	public AdminCourseServlet() {
		super();
		stuCou=new StudentCourseDAO();
	}

	/**
	 * 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 {
		  RequestDispatcher rd=null;
          ServletContext sc=this.getServletContext();
          HttpSession session=request.getSession(true);
          if(session.getAttribute("student")!=null)
          {
        	  String stuNum=((Student)session.getAttribute("student")).getStuNum();
        	  ArrayList<Course>courses=stuCou.getAllCourse(stuNum);
        	  session.setAttribute("courses", courses);
        	  rd=sc.getRequestDispatcher("/adminCourse.jsp");
          }
          else
          {
				request.setAttribute("error", "您还没有登陆，请先登陆!");
				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
	}

}