如何使用Apache POI将项目符号添加到word文档中Java

Question

我有一个word文档用作模板。在这个模板中，我有一些包含预定义要点的表。现在我试图用一组字符串替换占位符字符串。

我完全被这件事缠住了。我的简化方法是这样的。

        replaceKeyValue.put("[DescriptionOfItem]", new HashSet<>(Collections.singletonList("This is the description")));
        replaceKeyValue.put("[AllowedEntities]", new HashSet<>(Arrays.asList("a", "b")));
        replaceKeyValue.put("[OptionalEntities]", new HashSet<>(Arrays.asList("c", "d")));
        replaceKeyValue.put("[NotAllowedEntities]", new HashSet<>(Arrays.asList("e", "f")));

        try (XWPFDocument template = new XWPFDocument(OPCPackage.open(file))) {
            template.getTables().forEach(
                    xwpfTable -> xwpfTable.getRows().forEach(
                            xwpfTableRow -> xwpfTableRow.getTableCells().forEach(
                                    xwpfTableCell -> replaceInCell(replaceKeyValue, xwpfTableCell)
                            )
                    ));

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            template.write(baos);
            return new ByteArrayResource(baos.toByteArray());
        } finally {
            if (file.exists()) {
                file.delete();
            }
        }

private void replaceInCell(Map<String, Set<String>> replacementsKeyValuePairs, XWPFTableCell xwpfTableCell) {
        for (XWPFParagraph xwpfParagraph : xwpfTableCell.getParagraphs()) {
            for (Map.Entry<String, Set<String>> replPair : replacementsKeyValuePairs.entrySet()) {
                String keyToFind = replPair.getKey();
                Set<String> replacementStrings = replacementsKeyValuePairs.get(keyToFind);
                if (xwpfParagraph.getText().contains(keyToFind)) {
                    replacementStrings.forEach(replacementString -> {
                        XWPFParagraph paragraph = xwpfTableCell.addParagraph();
                        XWPFRun run = paragraph.createRun();
                        run.setText(replacementString);
                    });
                }

        }
    }

我期望在当前单元格中添加更多的项目符号。我错过了什么吗？段落包含占位符字符串和格式。

谢谢你的帮助！

更新：这是模板的一部分。我想自动搜索术语并替换它们。搜索工作到目前为止。但是试图替换项目符号以不可定位的NullPointer结束。使用字段会更容易吗？不过，我需要保留项目符号样式。

更新2：添加下载链接并更新代码。如果我迭代这些段落，似乎我不能改变它们。我得到一个空指针。下载链接：文字模板

Answer 1

由于Microsoft Word在其存储的不同运行中如何划分文本非常非常奇怪，如果没有一个完整的示例，包括所有代码和所讨论的Word文档，则无法回答这些问题。拥有一个通用的可用代码来向Word文档添加内容似乎是不可能的，除非所有的添加或替换仅在字段中（表单字段或内容控件或邮件合并字段）。

所以我下载了你的WordTemplate.docx看起来是这样的：

然后我运行了以下代码：

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

import org.apache.xmlbeans.XmlCursor;

import java.util.*; 

import java.math.BigInteger;

public class WordReadAndRewrite {

 static void addItems(XWPFTableCell cell, XWPFParagraph paragraph, Set<String> items) {
  XmlCursor cursor = null;
  XWPFRun run = null;
  CTR cTR = null; // for a deep copy of the run's low level object

  BigInteger numID = paragraph.getNumID();
  int indentationLeft = paragraph.getIndentationLeft();
  int indentationHanging = paragraph.getIndentationHanging();

  boolean first = true;
  for (String item : items) {
   if (first) {
    for (int r = paragraph.getRuns().size()-1; r > 0; r--) {
     paragraph.removeRun(r);
    }
    run = (paragraph.getRuns().size() > 0)?paragraph.getRuns().get(0):null;
    if (run == null) run = paragraph.createRun();
    run.setText(item, 0);
    cTR = (CTR)run.getCTR().copy(); // take a deep copy of the run's low level object
    first = false;
   } else {
    cursor = paragraph.getCTP().newCursor();
    boolean thereWasParagraphAfter = cursor.toNextSibling(); // move cursor to next paragraph 
                                                             // because the new paragraph shall be **after** that paragraph
                                                             // thereWasParagraphAfter is true if there is a next paragraph, else false
    if (thereWasParagraphAfter) {
     paragraph = cell.insertNewParagraph(cursor); // insert new paragraph if there are next paragraphs in cell
    } else {
     paragraph = cell.addParagraph(); // add new paragraph if there are no other paragraphs present in cell
    }

    paragraph.setNumID(numID); // set template paragraph's numbering Id
    paragraph.setIndentationLeft(indentationLeft); // set template paragraph's indenting from left
    if (indentationHanging != -1) paragraph.setIndentationHanging(indentationHanging); // set template paragraph's hanging indenting
    run = paragraph.createRun();
    if (cTR != null) run.getCTR().set(cTR); // set template paragraph's run formatting
    run.setText(item, 0);
   }
  }
 }

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

  Map<String, Set<String>> replaceKeyValue = new HashMap<String, Set<String>>();
  replaceKeyValue.put("[AllowedEntities]", new HashSet<>(Arrays.asList("allowed 1", "allowed 2", "allowed 3")));
  replaceKeyValue.put("[OptionalEntities]", new HashSet<>(Arrays.asList("optional 1", "optional 2", "optional 3")));
  replaceKeyValue.put("[NotAllowedEntities]", new HashSet<>(Arrays.asList("not allowed 1", "not allowed 2", "not allowed 3")));

  XWPFDocument document = new XWPFDocument(new FileInputStream("WordTemplate.docx"));
  List<XWPFTable> tables = document.getTables();
  for (XWPFTable table : tables) {
   List<XWPFTableRow> rows = table.getRows();
   for (XWPFTableRow row : rows) {
    List<XWPFTableCell> cells = row.getTableCells();
    for (XWPFTableCell cell : cells) {

     int countParagraphs = cell.getParagraphs().size();
     for (int p = 0; p < countParagraphs; p++) { // do not for each since new paragraphs were added
      XWPFParagraph paragraph = cell.getParagraphArray(p);

      String placeholder = paragraph.getText();
      placeholder = placeholder.trim(); // this is the tricky part to get really the correct placeholder

      Set<String> items = replaceKeyValue.get(placeholder);
      if (items != null) {
       addItems(cell, paragraph, items);
      }
     }

    }
   }
  }

  FileOutputStream out = new FileOutputStream("Result.docx");
  document.write(out);
  out.close();
  document.close();

 }
}

Result.docx看起来是这样的：

代码在Word文档中的表格单元格中循环，并查找恰好包含占位符的段落。这甚至可能是一个棘手的部分，因为占位符可能被拆分成不同的文本，由Word运行。如果找到了，它会运行一个方法addItems，该方法将找到的段落作为编号和缩进的模板（不过可能是不可过滤的）。然后，它在找到的段落的第一个文本运行中设置第一个新项，并删除可能存在的所有其他文本运行。然后确定是否必须在单元格中插入或添加新段落。为此，将使用XmlCursor。在新插入或添加的段落中，其他项目被放置，编号和缩进设置取自占位符的段落。

如前所述，这是用于展示如何做的原则的代码。它必须进行非常大的扩展才能通用。在我看来，那些在Word文档中使用文本占位符替换文本的试验并不太好。Word文档中可变文本的占位符应该是字段。这可以是表单字段、内容控件或邮件合并字段。与文本占位符相比，字段的优势在于Word知道字段是可变文本的实体。它不会因为多种奇怪的原因将它们拆分为多个文本运行，就像通常对普通文本所做的那样。