use tika to convert pdf file to txt.

pdf-to-txt.java

//although it is hard job to convert pdf to text, tika tool is cool for this. it can auto detect pdf format and choose parser to parse the pdf. 


package june;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.sax.BodyContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

public class TikeParser {

    public static void main(String[] args){
        InputStream is = null;
        OutputStream out =null;
        //String outPutFile="E:/notice/errorpdf/1.txt";
        String dirPathIn="C:/Users/Administrator/Desktop/finance_year/";
        String dirPathOut="E:/notice/finance_year_txt_s/";
        File dir = new File(dirPathIn);
        String[] filenames = dir.list();
    
        int lenFiles = filenames.length;
        try {
            for(int i=0;i<lenFiles;i++){
            	System.out.println(i+" : "+filenames[i]);
            	is = new BufferedInputStream(new FileInputStream(new File(dirPathIn+filenames[i])));
                out= new FileOutputStream(dirPathOut+i+".txt");
                Parser parser = new AutoDetectParser();
                ContentHandler handler = new BodyContentHandler(out);

                Metadata metadata = new Metadata();

                parser.parse(is, handler, metadata, new ParseContext());

            }
//            for (String name : metadata.names()) {
//                String value = metadata.get(name);
//
//                if (value != null) {
//                    System.out.println("Metadata Name:  " + name);
//                    System.out.println("Metadata Value: " + value);
//                }
//            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TikaException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                    out.close();
                } catch(IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}