studentclservlet.java

课程管理系统

package cn.rludrea.servlet;

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

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

import cn.rludrea.model.*;

public class StudentClServlet extends HttpServlet {

	/**
	 * 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 {

		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		PrintWriter out = response.getWriter();
		
		//接收要处理的类型；
		String type=request.getParameter("type");
		
		if(type.equals("divide")){
		//处理分页
		String pageNow=request.getParameter("pageNow");
		//request.setAttribute("s_pageNow", pageNow);
		String hide=request.getParameter("hide");
		CourseBeanBO cbo=new CourseBeanBO();
		ArrayList al=new ArrayList();
		if(hide.equals("1"))
		{	
			al=cbo.getCourseByPage(6, Integer.parseInt(pageNow));
			request.setAttribute("al", al);
			int pageCount=cbo.getPageCount(6);
			String s_pageCount=pageCount+"";
			request.setAttribute("pageCount", s_pageCount);
		}
		else
		{
			String courseName=(String)request.getSession().getAttribute("courseName");
			al=cbo.getCourseLikeByPage(6, Integer.parseInt(pageNow), courseName);
			request.setAttribute("al", al);
			String pageCount=cbo.getLikePageCount(6, courseName)+"";
			request.setAttribute("pageCount", pageCount);
		}
		request.getRequestDispatcher("showCourse.jsp").forward(request, response);
		}else if(type.equals("intro"))
		{
			//接收传过来的courseId的值；
			String courseId=request.getParameter("courseId");
			CourseBeanBO cbo=new CourseBeanBO();
			CourseBean cb=new CourseBean();
			cb=cbo.getCourseBean(courseId);
			request.setAttribute("CourseIntro", cb);
			request.getRequestDispatcher("courseIntro.jsp").forward(request, response);
		}else if(type.equals("update"))
		{
			//接收用户ID（stuId）和课程编号（courseId)
			String stuName=(String)request.getSession().getAttribute("stuName");
			String courseId=request.getParameter("courseId");
			CourseBeanBO cbo=new CourseBeanBO();
			if(cbo.updateStuCourse(courseId, stuName))
			{
				CourseBean cb=(CourseBean)cbo.getCourseBean(courseId);
				request.setAttribute("cb", cb);
				request.getRequestDispatcher("stuCourse.jsp").forward(request, response);
			}
			else
			{
				request.getRequestDispatcher("").forward(request, response);
			}
		}
		else if(type.equals("stuCourse"))
		{
			String stuName=request.getParameter("stuName");
			CourseBeanBO cbo=new CourseBeanBO();
			String courseId=cbo.getCourseIdBystuName(stuName);
			CourseBean cb=(CourseBean)cbo.getCourseBean(courseId);
			request.setAttribute("cb", cb);
			request.getRequestDispatcher("stuCourse.jsp").forward(request, response);
		}else if(type.equals("check")){
			String courseName=request.getParameter("courseName");
			request.getSession().setAttribute("courseName", courseName);
			ArrayList al=new ArrayList();
			CourseBeanBO cbo=new CourseBeanBO();
			al=cbo.getCourseBeanByCourseName(6,courseName);
			request.setAttribute("al", al);	
			String pageCount=cbo.getLikePageCount(6, courseName)+"";
			request.setAttribute("pageCount", pageCount);
			request.getSession().setAttribute("hide", "2");
			request.getRequestDispatcher("showCourse.jsp").forward(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 {

		this.doGet(request, response);
	}

}