It's a simple class to print strings in a pdf page.

StringPrinting.java

package com.kbashar.pdfboxtry;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.util.PDFOperator;

import java.io.IOException;
import java.util.List;

/**
 * Created by kbashar on 2/24/15.
 */
public class StringPrinting {

    public void printString(String fileName) throws IOException {
        PDDocument document = PDDocument.load(fileName);
        List<PDPage> pages = document.getDocumentCatalog().getAllPages();
        PDPage firstPage = pages.get(0);
        COSStream stream = firstPage.getContents().getStream();
        List tokens = stream.getStreamTokens();
        for (int j =0;j<tokens.size();j++) {
            Object obj = tokens.get(j);
            //System.out.println(obj.toString());
            if (obj instanceof PDFOperator) {
                PDFOperator op = (PDFOperator) obj;
                if( op.getOperation().equals( "Tj" ) )
                {
                    //Tj takes one operator and that is the string
                    //to display so lets update that operator
                    COSString previous = (COSString)tokens.get( j-1 );
                    System.out.println(previous);
                    String string = previous.getString();
                    System.out.println(string);
                }
                else if (op.getOperation().equals("TJ")) {
                COSArray previous = (COSArray) tokens.get(j - 1);
                for (int k = 0; k < previous.size(); k++) {
                    Object arrElement = previous.getObject(k);
                    if (arrElement instanceof COSString) {
                        COSString cosString = (COSString) arrElement;
                        String string = cosString.getString();
                        System.out.print(string);
                    }
                }
                //System.out.println();
            }

        }
        }
    }

    public static void main(String[] args)  {
        StringPrinting strPrnt = new StringPrinting();
        try {
            if (args.length==1) {
                strPrnt.printString(args[0]);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}