JAVA pdfbox PDF 到非常简单的 HTML

JAVA pdfbox PDF to very simple HTML

提问by Andrea Silvestri

I would like to build an application which converts PDF Screenplays in HTML. Screenplays are very simple texts with no image nor other kind of objects, but formatting is very important. Fortunately there aren't much formatting conventions either.

我想构建一个将 PDF 剧本转换为 HTML 的应用程序。剧本是非常简单的文本，没有图像或其他类型的对象，但格式非常重要。幸运的是，也没有太多的格式约定。

That said, I found in the internet the PDFbox java library and I would like to use it, but I can't find examples on how retreiving information about formatting (or about coordinates of the text).

也就是说，我在互联网上找到了 PDFbox java 库，我想使用它，但我找不到有关如何检索有关格式（或文本坐标）信息的示例。

What I need is to know the margin box coordinates and the ones of the text so I can compare them to check whether the text is indented or not.

我需要的是知道边距框坐标和文本的坐标，以便我可以比较它们以检查文本是否缩进。

I hope I've been clear enough.

我希望我已经足够清楚了。

Thank you in advance!

先感谢您！

回答by Emily

https://pdfbox.apache.org/2.0/commandline.html#extracttext

https://pdfbox.apache.org/2.0/commandline.html#extracttext

"-html boolean false Output in HTML format instead of raw text."

“-html boolean false 以 HTML 格式输出而不是原始文本。”

This looks like what you need.

这看起来像你所需要的。

回答by Neeraj

Please have a look at this link. I think it will help you. Anyway I am copying the code from there in case if the link is broken...

请看看这个链接。我想它会帮助你。无论如何，我正在从那里复制代码，以防链接断开...

package printtextlocations;

import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.pdfbox.exceptions.InvalidPasswordException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
 import org.apache.pdfbox.pdmodel.common.PDStream;
import org.apache.pdfbox.util.PDFTextStripper;
import org.apache.pdfbox.util.TextPosition;

public class PrintTextLocations extends PDFTextStripper {

public static StringBuilder tWord = new StringBuilder();
public static String seek;
public static String[] seekA;
public static List wordList = new ArrayList();
public static boolean is1stChar = true;
public static boolean lineMatch;
public static int pageNo = 1;
public static double lastYVal;

public PrintTextLocations()
        throws IOException {
    super.setSortByPosition(true);
}

public static void main(String[] args)
        throws Exception {
    PDDocument document = null;
    seekA = args[1].split(",");
    seek = args[1];
    try {
        File input = new File(args[0]);
        document = PDDocument.load(input);
        if (document.isEncrypted()) {
            try {
                document.decrypt("");
            } catch (InvalidPasswordException e) {
                System.err.println("Error: Document is encrypted with a password.");
                System.exit(1);
            }
        }
        PrintTextLocations printer = new PrintTextLocations();
        List allPages = document.getDocumentCatalog().getAllPages();

        for (int i = 0; i < allPages.size(); i++) {
            PDPage page = (PDPage) allPages.get(i);
            PDStream contents = page.getContents();

            if (contents != null) {
                printer.processStream(page, page.findResources(), page.getContents().getStream());
            }
            pageNo += 1;
        }
    } finally {
        if (document != null) {
            System.out.println(wordList);
            document.close();
        }
    }
}

@Override
protected void processTextPosition(TextPosition text) {
    String tChar = text.getCharacter();
    System.out.println("String[" + text.getXDirAdj() + ","
            + text.getYDirAdj() + " fs=" + text.getFontSize() + " xscale="
            + text.getXScale() + " height=" + text.getHeightDir() + " space="
            + text.getWidthOfSpace() + " width="
            + text.getWidthDirAdj() + "]" + text.getCharacter());
    String REGEX = "[,.\[\](:;!?)/]";
    char c = tChar.charAt(0);
    lineMatch = matchCharLine(text);
    if ((!tChar.matches(REGEX)) && (!Character.isWhitespace(c))) {
        if ((!is1stChar) && (lineMatch == true)) {
            appendChar(tChar);
        } else if (is1stChar == true) {
            setWordCoord(text, tChar);
        }
    } else {
        endWord();
    }
}

protected void appendChar(String tChar) {
    tWord.append(tChar);
    is1stChar = false;
}

protected void setWordCoord(TextPosition text, String tChar) {
    tWord.append("(").append(pageNo).append(")[").append(roundVal(Float.valueOf(text.getXDirAdj()))).append(" : ").append(roundVal(Float.valueOf(text.getYDirAdj()))).append("] ").append(tChar);
    is1stChar = false;
}

protected void endWord() {
    String newWord = tWord.toString().replaceAll("[^\x00-\x7F]", "");
    String sWord = newWord.substring(newWord.lastIndexOf(' ') + 1);
    if (!"".equals(sWord)) {
        if (Arrays.asList(seekA).contains(sWord)) {
            wordList.add(newWord);
        } else if ("SHOWMETHEMONEY".equals(seek)) {
            wordList.add(newWord);
        }
    }
    tWord.delete(0, tWord.length());
    is1stChar = true;
}

protected boolean matchCharLine(TextPosition text) {
    Double yVal = roundVal(Float.valueOf(text.getYDirAdj()));
    if (yVal.doubleValue() == lastYVal) {
        return true;
    }
    lastYVal = yVal.doubleValue();
    endWord();
    return false;
}

protected Double roundVal(Float yVal) {
    DecimalFormat rounded = new DecimalFormat("0.0'0'");
    Double yValDub = new Double(rounded.format(yVal));
    return yValDub;
}
}