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依赖文件：
com.itextpdf
itextpdf
5.5.10
com.itextpdf
itext-asian
5.2.0
创建PDF文件
public PdfReader getPdfBytes(Element element) {
if (element == null) {
return null;
}
Document document = new Document();
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
PdfWriter writer = PdfWriter.getInstance(document, bos);
writer.setFullCompression();
writer.setCompressionLevel(PdfStream.BEST_COMPRESSION);
document.open();
document.add(element);
document.close();
writer.close();
return new PdfReader(bos.toByteArray());
} catch (Exception e) {
logger.error("getPdfBytes error", e);
}
return null;
}
public PdfPTable getUserTableInfo(List data) {
PdfPTable table = new PdfPTable(3);
table.setWidthPercentage(100);
float width = PageSize.A4.getWidth() - 40;
float dataWidth = width / 4;
float[] columnWidth = new float[] { dataWidth, dataWidth, dataWidth * 2};
try {
table.setTotalWidth(columnWidth);
} catch (Exception e) {
table.setTotalWidth(width);
}
table.addCell(getPdfCellInfo("ID"));
table.addCell(getPdfCellInfo("用户"));
table.addCell(getPdfCellInfo("简介"));
if (CollectionUtils.isNotEmpty(data)) {
data.stream().forEach(col -> {
table.addCell(getPdfCellInfo(col.getId()));
table.addCell(getPdfCellInfo(col.getUserName()));
table.addCell(getPdfCellInfo(col.getUserText()));
});
}
return table;
}
private PdfPCell getPdfCellInfo(String name) {
return getPdfCellInfo(name, 1);
}
private PdfPCell getPdfCellInfo(String name, int rowSpan) {
Font font = getBaseFontInstance();
PdfPCell cell = new PdfPCell(new Paragraph(StringUtils.defaultString(name), font));
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
if (rowSpan > 1) {
cell.setRowspan(rowSpan);
}
return cell;
}
public static Font getBaseFontInstance() {
if (baseFont == null) {
baseFont = getPdfFont();
}
return baseFont;
}
private static Font getPdfFont() {
try {
BaseFont bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",
BaseFont.NOT_EMBEDDED);
return new Font(bf, 10);
} catch (Exception e) {
return null;
}
}
合并pdf
public byte[] createAndMergeBlobPdf(List readers) {
if (CollectionUtils.isEmpty(readers)) {
return null;
}
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
Document document = new Document();
if (CollectionUtils.isNotEmpty(readers)) {
PdfCopy copy = new PdfCopy(document, bos);
copy.setFullCompression();
copy.setCompressionLevel(PdfStream.BEST_COMPRESSION);
document.open();
for (PdfReader reader: readers) {
if (reader != null) {
int n = reader.getNumberOfPages();
for (int j = 1; j |