TweetbyPaper.java

import java.io.File;
import java.util.ArrayList;

import net.sourceforge.tess4j.ITesseract;
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;

import twitter4j.Status;
import twitter4j.Twitter;
import twitter4j.TwitterFactory;

public class OCRtest {

    public static void main(String[] args){
        String folderPath = "path";

        ArrayList<String> fileList;
        fileList = readFiles(folderPath);
        int n=0;
        while(fileList.size() > n) {
            String path = folderPath + fileList.get(n);
            readAndTweet(path);
            deleteFile(path);
            n++;
        }

    }

    private static ArrayList readFiles(String folderPath) throws NullPointerException{

        File file = new File(folderPath);
        File files[] = file.listFiles();
        ArrayList<String> fileList = new ArrayList();

        for(int n=0;n<files.length;n++){
            fileList.add(files[n].getName());
        }
        return fileList;
    }

    private static void readAndTweet(String path){
        File imageFile = new File(path);
        ITesseract instance = new Tesseract();
        String result = null;

        try {
          
            instance.setLanguage("jpn");
            result = instance.doOCR(imageFile);
            System.out.println(result);  
        } 
        catch (TesseractException ex) {
            ex.printStackTrace();
        }

        try {
            Twitter tw = new TwitterFactory().getInstance();
            if(result != null){
                result += "\n #byPaper";
                Status status = tw.updateStatus(result);
            }
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }

    private static void deleteFile(String path){

        java.io.File dFile = new java.io.File(path);
        if(!dFile.exists()) {
            return;
        }
        if(dFile.isFile()) {
            dFile.delete();
        }
    }
}