lecturerservlet.java.svn-base

远程学生作业提交系统,所用技术JSP,Servelet,Ajax,Web Services,MySql

package com.sixtwenty.servlet;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.ArrayList;
import java.util.Calendar;
import com.sixtwenty.*;

import com.sixtwenty.Submit;
import com.sixtwenty.SubmitServiceLocator;

/**
 * This servlet is accessed when the lecture login to the system
 * @author grp-e
 *
 */
public class LecturerServlet extends HttpServlet
{

	/**
	 * Handles the get request
	 * @param request
	 * @param response
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException
	{

		Submit submit = null;

		try {
			//Instantiate the SubmitServiceLocator
			SubmitServiceLocator ssl = new SubmitServiceLocator();
			submit = ssl.getsubmit();
		} catch(Exception e) {
			throw new ServletException(e.toString());
		}

		// Get the type of action to do
		String action = new String(request.getParameter("action"));

		// To get the staff identifier
		String staffId = (String)request.getSession().getAttribute("username");	//The staffId

		// If we don't know the staff's identifier => access error
		if (staffId == null || staffId.equals("")) {

			//Forwarding to next jsp
			RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/jsp/errorpage.jsp");
			requestDispatcher.forward(request, response);
			return;
		}

		//If the action is listproject
		if (action.equalsIgnoreCase("listproject"))
		{
			Projects[] listOfProject = null;	//The list of Projects[]
			
			//call to remote method getProjectStaff to get the list of project
			listOfProject = submit.getProjectStaff(staffId);
			
			//set the list of projects in session
			request.getSession().setAttribute("listOfProject", listOfProject);
			
			//Forwarding to next jsp
			RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/jsp/listprojectstaff.jsp");
			requestDispatcher.forward(request, response);
		}

		//if action is submissions
		if (action.equalsIgnoreCase("submissions"))
		{
			String projId = new String(request.getParameter("projId"));	//The project id
			Submissions[] listOfSubmissions = null;
			
			//call to remote method getProjectSubmissions to get the list of submissions
			listOfSubmissions = submit.getProjectSubmissions(projId);
			
			//set the list of submissions in session
			request.getSession().setAttribute("listOfSubmission", listOfSubmissions);
			RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/jsp/submissionsStaff.jsp");
			requestDispatcher.forward(request, response);
		}
		
		//if action is download
		if (action.equalsIgnoreCase("download"))
		{
			String subId = new String(request.getParameter("subId"));	//The subject Id
			String filename = new String(request.getParameter("filename"));	// The filename
			
			//call to remote method getSubmission
			Submissions subm = submit.getSubmission(subId);	

			response.setContentType("applicatioin/bin");
			
			// Set the file name
			response.setHeader("Content-disposition", "attachment; filename=" + filename);
			
			// Get the output stream handler to stream bytes to the browser
			ServletOutputStream os = response.getOutputStream();

			byte[] fileContents; // The file contents to stream

			int i = 0;
			boolean find = subm.getSub_files()[0].getFilename().equals(filename);
			while (i < subm.getSub_files().length && !find) {
				i++;
				find = subm.getSub_files()[i].getFilename().equals(filename);
			}

			if (!find)
				throw new ServletException("fn: " + filename + " subId= " + subId + " i: " + (i));
			fileContents = subm.getSub_files()[i].getFileContents();

			//write the content
			os.write(fileContents, 0, fileContents.length);

		}

		//if the action is openandclose
		if (action.equalsIgnoreCase("openandclose"))
		{
			String projectid = request.getParameter("projId");	//The project id
			String status = submit.getProjectStatus(projectid);	//The status
			
			//Set the status in session
			request.getSession().setAttribute("status", status);	
			
			Calendar openDate = submit.getProjectOpendate(projectid);	//The open date
			
			//set the open date in session
			request.getSession().setAttribute("openDate", openDate);
			
			Calendar closeDate = submit.getProjectClosedate(projectid);	//The close date
			
			//set the close date in session
			request.getSession().setAttribute("closeDate", closeDate);
			
			//call to remote method getProjectByID
			Projects project = submit.getProjectByID(projectid);
			
			//set the Project in session
			request.getSession().setAttribute("project", project);
			
			//Forwarding to next jsp
			RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/jsp/openandcloseproject.jsp");
			requestDispatcher.forward(request, response);
		}

		//if the action is setopenandclose
		if (action.equalsIgnoreCase("setopenandclose"))
		{
			String projectid = request.getParameter("projId");	//The project id
			String opentime = request.getParameter("opentime");	//The open time
			String closetime = request.getParameter("closetime");	//The close time
			String status = request.getParameter("status");	//The status
			boolean asOpendate = false;	//The flag for open date
			boolean asClosedate = false;	//The flag for close date

			String time = opentime;	//The time
			
			//validation on open date
			if (opentime != null && !opentime.equals("") && !opentime.equals("None") && !opentime.equals("\\s")) {
				String[] result = time.split("\\s");
				String[] date = result[0].split("-");
				
				//Instantiate the calendar
				Calendar projTimeOpen = Calendar.getInstance();
				
				//set open date in calendar object
				projTimeOpen.set( projTimeOpen.YEAR, Integer.parseInt(date[0]));
				projTimeOpen.set( projTimeOpen.MONTH, Integer.parseInt(date[1])-1);
				projTimeOpen.set( projTimeOpen.DATE, Integer.parseInt(date[2]));
				
				//call to remote method setProjectOpendate
				submit.setProjectOpendate(projectid, projTimeOpen);
				asOpendate = true;
			} else {
				
				//call to remote method setProjectOpendate
				submit.setProjectOpendate(projectid, null);
			}

			time = closetime;
			
			//validation on close date
			if (closetime != null && !closetime.equals("") && !closetime.equals("None") && !closetime.equals("\\s")) {
				String[] result = time.split("\\s");
				String[] date = result[0].split("-");
				
				//Instantiate Calendar
				Calendar projTimeClose = Calendar.getInstance();
				projTimeClose.set( projTimeClose.YEAR, Integer.parseInt(date[0]));
				projTimeClose.set( projTimeClose.MONTH, Integer.parseInt(date[1])-1);
				projTimeClose.set( projTimeClose.DATE, Integer.parseInt(date[2]));
				
				//call to remote method setProjectClosedate
				submit.setProjectClosedate(projectid, projTimeClose);
				asClosedate = true;
			} else {
				
				//call to remote method setProjectClosedate
				submit.setProjectClosedate(projectid, null);
			}

			//call to remote method setProjectStatus
			submit.setProjectStatus(projectid, status);

			Projects[] listOfProject = null;	//The list of projects
			
			//call to remote method setProjectStatus
			listOfProject = submit.getProjectList();
			
			//set the list of projects in session
			request.getSession().setAttribute("listOfProject", listOfProject);
			
			//Forwarding to next jsp
			RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/jsp/listprojectstaff.jsp");
			requestDispatcher.forward(request, response);
		}

		//if action is createproject
		if (action.equalsIgnoreCase("createproject"))
		{
			Subjects[] listOfSubjects = null;	//the list of subjects
			
			//call to remote method getSubjectList
			listOfSubjects = submit.getSubjectList();
			
			//set the list of subjects in session
			request.getSession().setAttribute("listsubjects", listOfSubjects);
			
			//Forwarding to next jsp
			RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/jsp/createproject.jsp");
			requestDispatcher.forward(request, response);
		}

		//if action is addproject
		if (action.equalsIgnoreCase("addproject"))
		{
			String subjCode = new String(request.getParameter("subjCode"));	//The subject code
			String year = new String(request.getParameter("year"));	//The year
			String semester = new String(request.getParameter("semester"));	//The semester
			String projName = request.getParameter("projName");	//The project name
			String projDesc = new String(request.getParameter("projDesc"));	//The project description
			String projURL = new String(request.getParameter("projURL"));	//The project url

			//call to remote method addProject
			submit.addProject(subjCode, year, semester, projName, projDesc, projURL);

			Projects[] listOfProject = null;	//The list of project

			//Call to remote method getProjectStaff
			listOfProject = submit.getProjectStaff(staffId);

			//set the list of projects in session
			request.getSession().setAttribute("listOfProject", listOfProject);

			//Forwarding to next jsp
			RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/jsp/listprojectstaff.jsp");

			requestDispatcher.forward(request, response);
		}
	}

	/**
	 * Handles the post request
	 * @param request
	 * @param response
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException
	{

		doGet(request, response);

	}
}