src/com/ischoolbar/programmer/servlet/CourseServlet.java

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package com.ischoolbar.programmer.servlet;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import com.ischoolbar.programmer.dao.CourseDao;
import com.ischoolbar.programmer.dao.TeacherDao;
import com.ischoolbar.programmer.model.Course;
import com.ischoolbar.programmer.model.Page;

public class CourseServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = -1991371597134855732L;
	
	public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
		doPost(request, response);
	}
	public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{
		String method = request.getParameter("method");
		if("toCourseListView".equals(method)){
			try {
				request.getRequestDispatcher("view/courseList.jsp").forward(request, response);
			} catch (ServletException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}else if("AddCourse".equals(method)){
			addCourse(request,response);
		}else if("CourseList".equals(method)){
			getCourseList(request,response);
		}else if("EditCourse".equals(method)){
			editCourse(request,response);
		}else if("DeleteCourse".equals(method)){
			deleteCourse(request,response);
		}
	}
	private void deleteCourse(HttpServletRequest request,
			HttpServletResponse response) {
		// TODO Auto-generated method stub
		String[] ids = request.getParameterValues("ids[]");
		String idStr = "";
		for(String id : ids){
			idStr += id + ",";
		}
		idStr = idStr.substring(0, idStr.length()-1);
		CourseDao courseDao = new CourseDao();
		if(courseDao.deleteCourse(idStr)){