deletestudent.java

使用JSP+Servlet+Hibernate+Struts实现的一个学生软件发布平台

package edu.neu.sspp.servlet.teacher;

import java.io.IOException;
import java.io.PrintWriter;

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

import org.hibernate.Transaction;

import edu.neu.sspp.SSPPLogger;
import edu.neu.sspp.StudentHandler;
import edu.neu.sspp.exception.AddTwiceException;
import edu.neu.sspp.exception.StudentNotFoundException;
import edu.neu.sspp.exception.TooManyStudentsException;
import edu.neu.sspp.hibernate.HibernateSessionFactory;
import edu.neu.sspp.hibernate.TTeacher;
import edu.neu.sspp.hibernate.TTeacherDAO;

public class DeleteStudent extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DeleteStudent() {
		super();
	}

	/**
	 * 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 {

		TTeacherDAO teacherDAO = new TTeacherDAO();
		TTeacher teacher = teacherDAO.findById((String)request.getSession().getAttribute("id"));
		
		StudentHandler sh = new StudentHandler(teacher.getStudents());
		try {
			sh.deleteStudent(request.getParameter("name"));
		} catch (StudentNotFoundException e) {
			// TODO Auto-generated catch block
			response.getWriter().print(e.getMessage());
		}
		
		teacher.setStudents(sh.getStudents());
		
		Transaction transaction = 
			HibernateSessionFactory.getSession().beginTransaction();
		
		teacherDAO.save(teacher);
		
		transaction.commit();
		
		HibernateSessionFactory.closeSession();
		
		SSPPLogger.logInfo(teacher.getName() + " 删除学生" + " IP:" + request.getRemoteAddr());
		
		response.sendRedirect("Student?name=" + request.getParameter("name"));
	}

	/**
	 * 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 {

		doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}