如何重用Apache POI中的字体？

Question

Map<String, Font> fonts = new HashMap<>();

CustomProperties customProps  = workbook.getProperties().getCustomProperties(); 

if(customProps.contains("arial_12_b")) {
    short index = customProps.getProperty("arial_12_b").getI2();
    fonts.put("arial_12_b", workbook.getFontAt(index));
} else {                                
    Font font = workbook.createFont();
    font.setFontName("Arial");
    font.setFontHeightInPoints((short)12);
    font.setBold(true);

    customProps.addProperty("arial_12_b", font.getIndex());

    fonts.put("arial_12_b", font);
}

CellStyle通过CellUtil类解决了同样的问题，CellUtil类检查CellStyle是否已经存在，如果不存在则创建它。有字体的simular吗？

向
AFoeee致以最诚挚的问候

Answer 1

可以提供一种使用workbook.findfont来实现您所要求的内容的方法。与cellutil.setCellStyleProperties非常相似，它可以使用映射 object> fontProperties 来设置字体属性，其中fontProperty是workbook.findfont当前检查的所有属性的枚举。这是粗体，颜色，字体，字体名称，斜体，三振线，TYPEOFFSET，下划线。

示例：

 //method for getting current font from cell
 private static Font getFont(Cell cell) {
  Workbook wb = cell.getRow().getSheet().getWorkbook();
  CellStyle style = cell.getCellStyle();
  return wb.getFontAt(style.getFontIndex());
 }

 private enum FontProperty {
  BOLD, COLOR, FONTHEIGHT, FONTNAME, ITALIC, STRIKEOUT, TYPEOFFSET, UNDERLINE
 }

 //method for getting font having special settings additional to given source font
 private static Font getFont(Workbook wb, Font fontSrc, Map<FontProperty, Object> fontproperties) {
  boolean isBold = fontSrc.getBold();
  short color = fontSrc.getColor();
  short fontHeight = fontSrc.getFontHeight();
  String fontName = fontSrc.getFontName();
  boolean isItalic = fontSrc.getItalic();
  boolean isStrikeout = fontSrc.getStrikeout();
  short typeOffset = fontSrc.getTypeOffset();
  byte underline = fontSrc.getUnderline();

  for (FontProperty property : fontproperties.keySet()) {
   switch (property) {
    case BOLD:
     isBold = (boolean)fontproperties.get(property);
    break;
    case COLOR:
     color = (short)fontproperties.get(property);
    break;
    case FONTHEIGHT:
     fontHeight = (short)fontproperties.get(property);
    break;
    case FONTNAME:
     fontName = (String)fontproperties.get(property);
    break;
    case ITALIC:
     isItalic = (boolean)fontproperties.get(property);
    break;
    case STRIKEOUT:
     isStrikeout = (boolean)fontproperties.get(property);
    break;
    case TYPEOFFSET:
     typeOffset = (short)fontproperties.get(property);
    break;
    case UNDERLINE:
     underline = (byte)fontproperties.get(property);
    break;
   }
  }

  Font font = wb.findFont(isBold, color, fontHeight, fontName, isItalic, isStrikeout, typeOffset, underline);
  if (font == null) {
   font = wb.createFont();
   font.setBold(isBold);
   font.setColor(color);
   font.setFontHeight(fontHeight);
   font.setFontName(fontName);
   font.setItalic(isItalic);
   font.setStrikeout(isStrikeout);
   font.setTypeOffset(typeOffset);
   font.setUnderline(underline);
  }

  return font;
 }

在此代码中，workbook.findfont用于尝试找到一个已经具有所有属性的字体。只有当没有找到时(if(font==null))，才会创建一个新的字体。

如何使用：

  //set new cell D6 having special font settings
  row = CellUtil.getRow(5, sheet);
  cell = CellUtil.getCell(row, 3);
  fontproperties = new HashMap<FontProperty, Object>();
  fontproperties.put(FontProperty.BOLD, true);
  fontproperties.put(FontProperty.COLOR, IndexedColors.BLUE.getIndex());
  fontproperties.put(FontProperty.FONTHEIGHT, (short)(20*20));
  fontproperties.put(FontProperty.FONTNAME, "Courier New");
  fontproperties.put(FontProperty.STRIKEOUT, true);
  fontproperties.put(FontProperty.UNDERLINE, Font.U_DOUBLE);
  font = getFont(wb, getFont(cell), fontproperties);
  styleproperties = new HashMap<String, Object>();
  styleproperties.put(CellUtil.FONT, font.getIndex());
  CellUtil.setCellStyleProperties(cell, styleproperties);
  cell.setCellValue("new cell");