Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.mylop.servlet; import com.google.gson.Gson; import com.mylop.bean.Timeline; import com.mylop.model.TimelineModel; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.sql.SQLException; import java.util.Calendar; import java.util.Date; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; 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 org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * * @author quangbach */ public class TimelineServlet extends HttpServlet { public static final String UPLOAD_DIRECTORY = "/var/lib/tomcat7/webapps/Timeline"; /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> * methods. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { /* TODO output your page here. You may use following sample code. */ out.println("<!DOCTYPE html>"); out.println("<html>"); out.println("<head>"); out.println("<title>Servlet TimelineServlet</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Servlet TimelineServlet at " + request.getContextPath() + "</h1>"); out.println("</body>"); out.println("</html>"); } finally { out.close(); } } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String act = request.getParameter("act"); if (act.equals("timeline")) { getTimeLine(request, response); } if (act.equals("all")) { getAllTimeline(request, response); } } /** * Handles the HTTP <code>POST</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("application/json"); boolean isMultipart = ServletFileUpload.isMultipartContent(request); HttpSession session = request.getSession(); String userid = (String) session.getAttribute("userid"); String status = "aaa"; String urlTimelineImage = ""; String title = ""; String subtitle = ""; String content = ""; Date date = new Date(Calendar.getInstance().getTimeInMillis()); TimelineModel tm = new TimelineModel(); if (isMultipart) { FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { List<FileItem> multiparts = upload.parseRequest(request); for (FileItem item : multiparts) { if (!item.isFormField()) { String contentType = item.getContentType(); String fileName = UPLOAD_DIRECTORY + File.separator + userid + "_" + (tm.getLastIndex() + 1); File file = new File(fileName); item.write(file); urlTimelineImage = "http://mylop.tk:8080/Timeline/" + file.getName(); } else { String fieldName = item.getFieldName(); if (fieldName.equals("title")) { title = item.getString(); } if (fieldName.equals("subtitle")) { subtitle = item.getString(); } if (fieldName.equals("content")) { content = item.getString(); } if (fieldName.equals("date")) { Long dateLong = Long.parseLong(item.getString()); date = new Date(dateLong); } } } tm.addTimeline(userid, title, subtitle, date, content, urlTimelineImage); } catch (Exception e) { e.printStackTrace(); } } String json = "{\"message\": \"success\"}"; response.getWriter().write(json); } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> public void getTimeLine(HttpServletRequest request, HttpServletResponse response) { TimelineModel tm = new TimelineModel(); String dateParameter = request.getParameter("date"); String json = ""; long dateLong = Long.parseLong(dateParameter); Date date = new Date(dateLong); List<Timeline> list = tm.getTimeLinesByDate(date); Gson gson = new Gson(); json = gson.toJson(list); response.setHeader("Content-Type", "application/json"); try { response.getWriter().write(json); } catch (IOException ex) { Logger.getLogger(TimelineServlet.class.getName()).log(Level.SEVERE, null, ex); } } public void getAllTimeline(HttpServletRequest request, HttpServletResponse response) { TimelineModel tm = new TimelineModel(); String json = ""; List<Timeline> list = tm.getAllTimeline(); Gson gson = new Gson(); json = gson.toJson(list); response.setHeader("Content-Type", "application/json"); try { response.getWriter().write(json); } catch (IOException ex) { Logger.getLogger(TimelineServlet.class.getName()).log(Level.SEVERE, null, ex); } } }