Apache POI: ${my_placeholder} is treated as three different runs

问题

I have a .docx template with placeholders to be filled, such as ${programming_language}, ${education}, etc.

The placeholder keywords must be easily distinguished from the other plain words, hence they are enclosed with ${ }.

for (XWPFTable table : doc.getTables()) {
  for (XWPFTableRow row : table.getRows()) {
    for (XWPFTableCell cell : row.getTableCells()) {
      for (XWPFParagraph paragraph : cell.getParagraphs()) {
        for (XWPFRun run : paragraph.getRuns()) {
          System.out.println("run text: " + run.text());
          /** replace text here, etc. */
        }
      }
    }
  }
}

I want to extract the placeholders together with the enclosing ${ } characters. The problem is, that is seems like the enclosing characters are treated as different runs...

run text: ${
run text: programming_language
run text: }
run text: Some plain text here 
run text: ${
run text: education
run text: }

Instead, I would like to achieve the following effect:

run text: ${programming_language}
run text: Some plain text here
run text: ${education}

I have tried using other enclosing characters, such as: { }, < >, # #, etc.

I do not want to do some weird concatenations of runs, etc. I want to have it in a single XWPFRun.

If I cannot find the proper solution, I will just make it like so: VAR_PROGRAMMING_LANGUGE, VAR_EDUCATION, I think.

回答1:

Current apache poi 4.1.2 provides TextSegment to deal with those Word text-run issues. XWPFParagraph.searchText searches for a string in a paragraph and returns a TextSegment. This provides access to the begin run and the end run of that text in that paragraph (BeginRun and EndRun). It also provides access to the start character position in begin run and end character position in end run (BeginChar and EndChar). It additionally provides access to the index of the text element in the text run (BeginText and EndText). This always should be 0, because default text runs only have one text element.

Having this, we can do the following:

Replace the found partial string in begin run by the replacement. To do so, get the text part which was before the searched string and concatenate the replacement to it. After that the begin run fully contains the replacement.

Delete all text runs between begin run and end run as they contain parts of the searched string which is not more needed.

Let remain only the text part after the searched string in end run.

Doing so we are able replacing text which is in multiple text runs.

Following example shows this.

import java.io.*;
import org.apache.poi.xwpf.usermodel.*;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.*;

public class WordReplaceTextSegment {

 static public void replaceTextSegment(XWPFParagraph paragraph, String textToFind, String replacement) {
  TextSegment foundTextSegment = null;
  PositionInParagraph startPos = new PositionInParagraph(0, 0, 0);
  while((foundTextSegment = paragraph.searchText(textToFind, startPos)) != null) { // search all text segments having text to find

System.out.println(foundTextSegment.getBeginRun()+":"+foundTextSegment.getBeginText()+":"+foundTextSegment.getBeginChar());
System.out.println(foundTextSegment.getEndRun()+":"+foundTextSegment.getEndText()+":"+foundTextSegment.getEndChar());

   // maybe there is text before textToFind in begin run
   XWPFRun beginRun = paragraph.getRuns().get(foundTextSegment.getBeginRun());
   String textInBeginRun = beginRun.getText(foundTextSegment.getBeginText());
   String textBefore = textInBeginRun.substring(0, foundTextSegment.getBeginChar()); // we only need the text before

   // maybe there is text after textToFind in end run
   XWPFRun endRun = paragraph.getRuns().get(foundTextSegment.getEndRun());
   String textInEndRun = endRun.getText(foundTextSegment.getEndText());
   String textAfter = textInEndRun.substring(foundTextSegment.getEndChar() + 1); // we only need the text after

   if (foundTextSegment.getEndRun() == foundTextSegment.getBeginRun()) { 
    textInBeginRun = textBefore + replacement + textAfter; // if we have only one run, we need the text before, then the replacement, then the text after in that run
   } else {
    textInBeginRun = textBefore + replacement; // else we need the text before followed by the replacement in begin run
    endRun.setText(textAfter, foundTextSegment.getEndText()); // and the text after in end run
   }

   beginRun.setText(textInBeginRun, foundTextSegment.getBeginText());

   // runs between begin run and end run needs to be removed
   for (int runBetween = foundTextSegment.getEndRun() - 1; runBetween > foundTextSegment.getBeginRun(); runBetween--) {
    paragraph.removeRun(runBetween); // remove not needed runs
   }

  }
 }

 public static void main(String[] args) throws Exception {

  XWPFDocument doc = new XWPFDocument(new FileInputStream("source.docx"));

  String textToFind = "${This is the text to find}"; // might be in different runs
  String replacement = "Replacement text";

  for (XWPFParagraph paragraph : doc.getParagraphs()) { //go through all paragraphs
   if (paragraph.getText().contains(textToFind)) { // paragraph contains text to find
    replaceTextSegment(paragraph, textToFind, replacement);
   }
  }

  FileOutputStream out = new FileOutputStream("result.docx");
  doc.write(out);
  out.close();
  doc.close();

 }
}

来源：https://stackoverflow.com/questions/65275097/apache-poi-my-placeholder-is-treated-as-three-different-runs

标签

java

ms-word

apache-poi

xwpf