输入 ：包含嵌入式字体的(例如14个)PDF / A-1b文件列表。

处理 ：与Apache PDFBOX进行简单合并。

结果 ：1个PDF / A-1b文件，文件大小太大(太大)。(这几乎是所有源文件大小的总和)。

问题 ：是否可以减小生成的PDF的文件大小？

想法 ：删除多余的嵌入式字体。但是如何？这是正确的做法吗？

不幸的是，以下代码无法完成任务，但突出了明显的问题。

try (PDDocument document = PDDocument.load(new File("E:/tmp/16189_ZU_20181121195111_5544_2008-12-31_Standardauswertung.pdf"))) {

List collectedFonts = new ArrayList<>();

PDPageTree pages = document.getDocumentCatalog().getPages();

int pageNr = 0;

for (PDPage page : pages) {

pageNr++;

Iterable names = page.getResources().getFontNames();

System.out.println("Page " + pageNr);

for (COSName name : names) {

collectedFonts.add(name);

System.out.print("\t" + name + " - ");

PDFont font = page.getResources().getFont(name);

System.out.println(font + ", embedded: " + font.isEmbedded());

page.getCOSObject().removeItem(COSName.F);

page.getResources().getCOSObject().removeItem(name);

}

}

document.save("E:/tmp/output.pdf");

}

该代码产生如下输出：

Page 1

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 2

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F33} - PDTrueTypeFont ArialMT-BoldItalic, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 3

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 4

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 5

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F33} - PDTrueTypeFont ArialMT-BoldItalic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 6

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F33} - PDTrueTypeFont ArialMT-BoldItalic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 7

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F33} - PDTrueTypeFont ArialMT-BoldItalic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 8

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 9

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F33} - PDTrueTypeFont ArialMT-BoldItalic, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 10

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F33} - PDTrueTypeFont ArialMT-BoldItalic, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 11

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F33} - PDTrueTypeFont ArialMT-BoldItalic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 12

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 13

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

Page 14

COSName{F23} - PDTrueTypeFont ArialMT-Bold, embedded: true

COSName{F25} - PDTrueTypeFont ArialMT-Italic, embedded: true

COSName{F27} - PDTrueTypeFont ArialMT-Regular, embedded: true

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