projectinfo.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;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Set;

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.PageSeparator;
import edu.neu.sspp.hibernate.HibernateSessionFactory;
import edu.neu.sspp.hibernate.TProject;
import edu.neu.sspp.hibernate.TProjectDAO;
import edu.neu.sspp.hibernate.TUser;

public class ProjectInfo extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public ProjectInfo() {
		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 {

		String projectID = request.getParameter("proj");
		
		TProjectDAO projectDAO = new TProjectDAO();
		TProject project = projectDAO.findById(projectID);
		
		if(project != null) {
			TUser user = project.getTUser();
			if(request.getParameter("name").equals(user.getUserName())) {
				project.setBrowse(project.getBrowse() + 1);
				
				Transaction transaction = 
					HibernateSessionFactory.getSession().beginTransaction();
				projectDAO.save(project);
				transaction.commit();
				
				request.setAttribute("project", project);
				request.setAttribute("userID", user.getUserUid());
				request.setAttribute("userName", request.getParameter("name"));
				//不能使用equal的project的count进行判断,而是要在请求里写一个count
				request.setAttribute("count", project.getCount());		
				
				handlePage(project, request);
				
				request.getRequestDispatcher("../proj_jsp/proj_info.jsp").forward(request, response);
				return;
			}
		}
		
		HibernateSessionFactory.closeSession();
		response.getWriter().write("page not found");
		
	}
	
	//处理分页
	private void handlePage(TProject project, HttpServletRequest request) {
		Set set = project.getTComments();
		
		PageSeparator page = new PageSeparator(set.size(), edu.neu.sspp.Constant.comment_page_size);

		//如果页数小于或等于1，按不分页处理
		if(page.getTotalPage() <= 1) {
			request.setAttribute("comments", set);
			
			return;
		}
		
		if(request.getParameter("page") == null) {
			try {
				page.setCurrentPage(1);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		else {
			try {
				page.setCurrentPage(Integer.parseInt(request.getParameter("page")));
			} catch (NumberFormatException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		//此处的处理并不得当
		Iterator iterator = set.iterator();
		ArrayList comments = new ArrayList();
		for(int i = page.getCurrentPageBegin();i < page.getCurrentPageEnd(); i++ )
			comments.add(iterator.next());
			
		request.setAttribute("page", page);
		request.setAttribute("comments", comments);
		
	}

	/**
	 * 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
	}

}