www.pudn.com > SSPP.rar > AddStudent.java

package edu.neu.sspp.servlet.teacher; 
 
import java.io.IOException; 
 
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.TooManyStudentsException; 
import edu.neu.sspp.hibernate.HibernateSessionFactory; 
import edu.neu.sspp.hibernate.TTeacher; 
import edu.neu.sspp.hibernate.TTeacherDAO; 
 
public class AddStudent extends HttpServlet { 
 
	/** 
	 * Constructor of the object. 
	 */ 
	public AddStudent() { 
		super(); 
	} 
 
	/** 
	 * Destruction of the servlet. 
 
	 */ 
	public void destroy() { 
		super.destroy(); // Just puts "destroy" string in log 
		// Put your code here 
	} 
 
	/** 
	 * The doGet method of the servlet. 
 
	 * 
	 * 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.addStudent(request.getParameter("name")); 
		} catch (TooManyStudentsException e) { 
			// TODO Auto-generated catch block 
			response.getWriter().print(e.getMessage()); 
		} catch (AddTwiceException 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() + " Ìí¼ÓѧÉú" + " IP:" + request.getRemoteAddr()); 
		 
		response.sendRedirect("Student?name=" + request.getParameter("name")); 
	} 
 
	/** 
	 * The doPost method of the servlet. 
 
	 * 
	 * 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. 
 
	 * 
	 * @throws ServletException if an error occure 
	 */ 
	public void init() throws ServletException { 
		// Put your code here 
	} 
 
}