deletecourseservlet.java

来自「jsp的课程实践」· Java 代码 · 共 95 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 course.dao.StudentCourseDAO;

public class DeleteCourseServlet extends HttpServlet {

	private StudentCourseDAO stuCou;
	/**
	 * Constructor of the object.
	 */
	public DeleteCourseServlet() {
		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);  
		String courseId=request.getParameter("courseId");
		if(session.getAttribute("student")!=null)
		{
			String stuNum=((Student)session.getAttribute("student")).getStuNum();
			boolean flag=stuCou.deleteCourse(stuNum, courseId);
			if(flag==true)
			{
				//删除成功
				request.setAttribute("error", "您已经成共将该课程删除！");
			}
			else
			{
				request.setAttribute("error", "业务出现异常，删除课程失败");
				
			}
			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
	}

}