Java tutorial
/** eradioParser: This program extracts the radio station links along with their names, found on http://e-radio.gr, and creates a playlist. Copyright (C) 2012 Lappas Dionysis This file is part of eradioParser. eradioParser is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. eradioParser is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/> You may contact the author at: dio@freelabs.net */ package noThreads; import static noThreads.DefaultCaller.*; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import org.apache.commons.lang3.StringEscapeUtils; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements; public class Menu { private int choice = -1; private final String URL = new String("http://e-radio.gr"); public void createMenu() throws IOException, InterruptedException { Document doc = null; BufferedReader br = null; System.out.print("******************** Menu Options ******************** " + "\n1. Get a playlist for all the stations at <e-radio.gr>" + "\n2. View the available station Categories and get a playlist." + "\n3. View the available station Locations and get a playlist." + "\n4. View the station Ratings (Top) and get a playlist." + "\n5. Exit." + "\n\n" + "Please make a choice (1-5): "); br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } switch (choice) { case (1): //GET all the e-radio location links (in order to get all the links) doc = parseUrl(URL, 0); if (doc == null) { print("No connection to the server! Exiting..."); System.exit(1); } Elements links = doc.select("div[id=paneContainer]").select("a[href*=/locations/]"); for (Element link : links) theUrls.add(link.attr("abs:href")); System.out.println("...Processing <All e-radio> station links"); break; case (2): //Get CATEGORIES doc = parseUrl(URL, 0); if (doc == null) { print("No connection to the server! Exiting..."); System.exit(1); } Elements categoryLinks = doc.select("div[id=paneContainer]").select("a[href*=/categories/]"); System.out.println("E-radio stations available categories: " + "\n"); for (int i = 0; i < categoryLinks.size(); i++) { System.out.println(i + 1 + ". " + StringEscapeUtils.unescapeHtml4(categoryLinks.get(i).html())); } System.out.print("\n" + "Please make a choise (1-" + categoryLinks.size() + "): "); br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } if (choice <= categoryLinks.size() && choice >= 1) { theUrls.add(categoryLinks.get(choice - 1).attr("abs:href")); System.out.println("...Processing the <" + StringEscapeUtils.unescapeHtml4(categoryLinks.get(choice - 1).html()) + "> category"); } else { System.out.println("Wrong selection..."); System.out.println("Exiting program..."); System.exit(1); } break; case (3)://Get LOCATIONS doc = parseUrl(URL, 0); if (doc == null) { print("No connection to the server! Exiting..."); System.exit(1); } Elements locationLinks = doc.select("div[id=paneContainer]").select("a[href*=/locations/]"); System.out.println("E-radio stations available locations: " + "\n"); for (int i = 0; i < locationLinks.size(); i++) { System.out.println(i + 1 + ". " + StringEscapeUtils.unescapeHtml4(locationLinks.get(i).html())); } System.out.print("\n" + "Please make a choise (1-" + locationLinks.size() + "): "); br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } if (choice <= locationLinks.size() && choice >= 1) { theUrls.add(locationLinks.get(choice - 1).attr("abs:href")); System.out.println("...Processing <" + StringEscapeUtils.unescapeHtml4(locationLinks.get(choice - 1).html()) + "> locatino"); } else { System.out.println("Wrong selection!"); System.out.println("Exiting program..."); System.exit(1); } break; case (4): final int YEARLY_RATING = 10; doc = parseUrl(URL, 0); if (doc == null) { print("No connection to the server! Exiting..."); System.exit(1); } Elements ratingsMenu = doc.select("div[class=menuFly]").select("li").select("a[class=hide]"); print("\nStations ratings: \n"); for (int i = 0; i < ratingsMenu.size(); i++) { System.out.println(i + 1 + ". " + StringEscapeUtils.unescapeHtml4(ratingsMenu.get(i).html())); } System.out.print("\n" + "Please make a choise (1-" + ratingsMenu.size() + "): "); br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } /* * The html of the Ratings menu processed * has this structure: * <div> * <ul> * <li> * <ul> * ... * </ul> * </li> * ... * </ul> * </div> */ if (choice <= ratingsMenu.size() && choice >= 1) { //Get the DIV element with class "menuFly" Elements div = doc.select("div[class=menuFly]"); //div Elements list has only one element. So get the children of div Elements ul = div.get(0).children(); //ul Elements list has only one element. So get the children of ul Elements li = ul.get(0).children(); //remove blank elements for (int j = 0; j < li.size(); j++) { if (li.get(j).hasText() == false) li.remove(li.get(j)); } //get the title of user choice and print it out print("\n%s", StringEscapeUtils.unescapeHtml4(ratingsMenu.get(choice - 1).html()) + "\n"); //check if there is a sub-menu Elements ulTag = li.get(choice - 1).select("ul"); if (ulTag.hasText() == true) { Elements subMenu = ulTag.select("li").select("a[href]"); //print the sub-menu for (int j = 0; j < subMenu.size(); j++) print("%s. %s ", j + 1, StringEscapeUtils.unescapeHtml4(subMenu.get(j).html())); System.out.print("\n" + "Please make a choise (1-" + subMenu.size() + "): "); //read user input br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } if (choice <= subMenu.size() && choice >= 1) { theUrls.add(subMenu.get(choice - 1).attr("abs:href")); System.out.println("...Processing the <" + StringEscapeUtils.unescapeHtml4(subMenu.get(choice - 1).html()) + "> category"); } else { System.out.println("Wrong selection!"); System.out.println("Exiting program..."); System.exit(1); } } else { if (choice == YEARLY_RATING) { String url = li.get(choice - 1).select("a[href").attr("abs:href"); doc = parseUrl(url, 0); if (doc != null) { Elements yearTopSubMenu = doc.select("div[id=maintabsid]").select("a[href]"); //print the sub-menu for (int i = 0; i < yearTopSubMenu.size(); i++) print("%s. %s", i + 1, StringEscapeUtils.unescapeHtml4(yearTopSubMenu.get(i).html())); System.out.print("\n" + "Please make a choise (1-" + yearTopSubMenu.size() + "): "); //read user input br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } if (choice <= yearTopSubMenu.size() && choice >= 1) { if (choice == 1) { theUrls.add(yearTopSubMenu.get(choice - 1).attr("abs:href")); print("...Processing the <" + StringEscapeUtils.unescapeHtml4(yearTopSubMenu.get(choice - 1).html()) + "> category"); } else if (choice == 2) { String link = yearTopSubMenu.get(choice - 1).attr("abs:href"); doc = parseUrl(link, 0); //print menu title print("\n%s", StringEscapeUtils.unescapeHtml4(yearTopSubMenu.get(choice - 1).html()) + "\n"); if (doc != null) { Elements elem = doc.select("select[id=selectoption]") .select("option[value]"); ArrayList<Integer> nums = new ArrayList<Integer>(); for (int i = 0; i < elem.size(); i++) { //get the select category values and print the sub-menu int num = Integer.parseInt(elem.get(i).attr("value")); //add them to list nums.add(num); print("%s. %s", i + 1, StringEscapeUtils.unescapeHtml4( elem.get(i).html().replace("Select category: ", ""))); } System.out.print("\n" + "Please make a choise (1-" + elem.size() + "): "); //read user input br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } if (choice <= elem.size() && choice >= 1) { int num = nums.get(choice - 1); String added = "max=100&id=" + num + "&"; String newlink = link.replace("max=100&", added); //print("\nlink: %s", newlink); DEBUG print theUrls.add(newlink); System.out .println("...Processing the <" + StringEscapeUtils.unescapeHtml4(elem.get(choice - 1) .html().replace("Select category: ", "")) + "> category"); print(elem.get(choice - 1).select("a[href]").attr("abs:href")); } else { System.out.println("Wrong selection!"); System.out.println("Exiting program..."); System.exit(1); } } else { System.out.println("ERROR: Cannot get links from server!"); System.out.println("Exiting program..."); System.exit(1); } } else { String link = yearTopSubMenu.get(choice - 1).attr("abs:href"); doc = parseUrl(link, 0); //print menu title print("\n%s", StringEscapeUtils.unescapeHtml4(yearTopSubMenu.get(choice - 1).html()) + "\n"); if (doc != null) { Elements elem = doc.select("select[id=selectoption]") .select("option[value]"); ArrayList<Integer> nums = new ArrayList<Integer>(); for (int i = 0; i < elem.size(); i++) { //get the select category values and print the sub-menu int num = Integer.parseInt(elem.get(i).attr("value")); //add them to list nums.add(num); print("%s. %s", i + 1, StringEscapeUtils.unescapeHtml4( elem.get(i).html().replace("Select location: ", ""))); } System.out.print("\n" + "Please make a choise (1-" + elem.size() + "): "); //read user input br = new BufferedReader(new InputStreamReader(System.in)); try { choice = Integer.parseInt(br.readLine()); } catch (IOException e) { System.out.println("Error!"); System.exit(1); } if (choice <= elem.size() && choice >= 1) { int num = nums.get(choice - 1); String[] linkParts = link.split("&", 4); String finalLink = linkParts[0] + "&" + linkParts[1] + "&" + "id=" + num + "&" + linkParts[3]; //print("\nlink: %s \n link2: %s \n link3: %s \n link: %s \nsize: %s", linkParts[0], linkParts[1], linkParts[2], linkParts[3], linkParts.length); // DEBUG print //print(finalLink); theUrls.add(finalLink); System.out .println("...Processing the <" + StringEscapeUtils.unescapeHtml4(elem.get(choice - 1) .html().replace("Select category: ", "")) + "> category"); print(elem.get(choice - 1).select("a[href]").attr("abs:href")); } else { System.out.println("Wrong selection!"); System.out.println("Exiting program..."); System.exit(1); } } else { System.out.println("ERROR: Cannot get links from server!"); System.out.println("Exiting program..."); System.exit(1); } } } else { System.out.println("Wrong selection!"); System.out.println("Exiting program..."); System.exit(1); } } else { System.out.println("ERROR: Cannot get links from server!"); System.out.println("Exiting program..."); System.exit(1); } } else { theUrls.add(li.get(choice - 1).select("a[href").attr("abs:href")); System.out.println("...Processing the <" + StringEscapeUtils.unescapeHtml4(ratingsMenu.get(choice - 1).html()) + "> category"); print(li.get(choice - 1).select("a[href]").attr("abs:href")); } } } else { System.out.println("Wrong selection!"); System.out.println("Exiting program..."); System.exit(1); } break; case (5): System.out.println("Exiting program..."); System.exit(0); break; default: System.out.println("Invalid choice! Exiting..."); System.exit(1); break; } }//end method }//end Class