CHDownloader

//This program is used to essentially download every Cyanide and Happiness comic
//By entering the first link of the comic's page, the program will save that image to your computer
//then go to the previous page and download that picture
//It will continue until you stop the program
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.Scanner;


public class CHDownloader {


    public static void main(String[] args) throws IOException {
        System.out.println("About CHDownloader:");
        System.out.println("This program will essentially download every comic from Cyanide and Happiness");
        System.out.println("It will start at your link, then move to PREVIOUS pages");
        System.out.println("Enter the Cyanide and Happiness comic number to start with It's found in the URL. Ex 2776");
        Scanner userInput = new Scanner(System.in);
        int theURL = userInput.nextInt();
        //System.out.println("Your images will have the following names: chimage-0.jpg,chimage-1.jpg etc");
        //System.out.println("Please enter your starting number. 0 or 1 is recommended:");
        //int chLinkNumber = userInput.nextInt();
        System.out.println("Press Ctrl + C to stop the program");

        //int damnLOLLinkNumber = 0;//Used to name every image
        //String theURL = "http://www.damnlol.com/i-shall-call-him-18574.html";//The first page the program will start at. It will go to every PREVIOUS page.
        URL link = new URL("http://www.explosm.net/comics/"+theURL+"/");//Created the first URL using the link above

        while(1>0){

            //This section downloads the HTML page
            ReadableByteChannel rbc = Channels.newChannel(link.openStream());//Gets the html page
            FileOutputStream fos = new FileOutputStream("page.html");//Creates the output name of the html page to be saved to the computer
            fos.getChannel().transferFrom(rbc, 0, 1 << 24);
            Scanner sc = new Scanner(new FileReader("page.html"));//Takes the downloaded HTML page and sends it to a scanner





            //This section converts the html page to the string
            String contents = "";
            while(sc.hasNextLine() || sc.hasNext()){
                contents = contents + sc.nextLine() + "\n"; //Contents is the html page as a string!
            }
            sc.close();//Closes the scanner file


            //This finds the next url to scan!
            /*Scanner sc2 = new Scanner(contents);//Takes the string version of the html page and sends it to a new scanner
            int counter = 0;//The previous page's url is on line 8, so I use this int as a counter
            String nextURL = "";
            while((sc2.hasNext() || sc2.hasNextLine()) && (counter != 8)){
            nextURL = sc2.findWithinHorizon("[h][t][t][p][:][/][/][w][w][w][.][d][a][m][n][l][o][l][.][c][o][m][/].*[.][h][t][m][l]", 0);//This grabs the url and saves it to a string
            counter += 1;//Adds one to the counter so it will stop at 8
            }
            link = new URL(nextURL);//This now sets link as the newly found url so when the program starts back at the top it will now download this HTML page
            //Ends next url!*/


            //This section finds the image to download
            Scanner sc2 = new Scanner(contents);//Sends the html to a scanner
            String theImage = "";
            int counter2 = 0;//I think that the image url is on line 2 so I need a counter
            while((sc2.hasNext() || sc2.hasNextLine()) && (counter2 != 1)){
            //theImage = sc2.findWithinHorizon("[h][t][t][p][:][/][/]www.explosm.net/db/files/Comics/.*[jJpPgG][pPnNiI][eE]?[gGfF]", 0);//This finds the image's url and saves it to a string
            theImage = sc2.findWithinHorizon("[h][t][t][p][:][/][/]www.explosm.net/db/files/Comics/.*[.][jJpPgG][pPnNiI][eE]?[gGfF]", 0);//This finds the image's url and saves it to a string
            counter2 += 1;//Adds one to my counter
            System.out.println(theImage);
            }
            //Ends finding image




            //This section determines the file extension
                String imageType = "";
                if(theImage.matches(".*[.][jJ][pP][gG]")){
                    imageType = ".jpg";
                }
                if(theImage.matches(".*[.][jJ][pP][eE][gG]")){
                    imageType = ".jpeg";
                }
                if(theImage.matches(".*[.][pP][nN][gG]")){
                    imageType = ".png";
                }
                if(theImage.matches(".*[.][gG][iI][Ff]")){
                    imageType = ".gif";
                }




            //This section saves the image itself
            URL link2 = new URL(theImage);//A new URL is created with the image's url that was found
            String chLinkFinal = "CH-" + theURL + imageType;//The string that will be used to name the file

            ReadableByteChannel rbc2 = Channels.newChannel(link2.openStream());//Gets the image
            FileOutputStream fos2 = new FileOutputStream(chLinkFinal);//The output of the file name
            fos2.getChannel().transferFrom(rbc2, 0, 1 << 24);
            System.out.println("Image Saved: " + chLinkFinal);//Prints the name of the file that is saved
            theURL -= 1;
            link = new URL("www.explosm.net/comics/"+theURL);//Sets up the next page to be read

        }
    }

}