iText的使用

Document document = new Document(PageSize.A4);
PdfWriter.getInstance(
  document, new FileOutputStream(localFileFullPathName)
);
document.open();

document.add(table);

PdfPTable table = new PdfPTable(1);

PdfPCell cell3 = new PdfPCell();
cell3.setBorder(0);//不显示单元格的边框
Paragraph paragraph9 = new Paragraph("test");//Paragraph 是段落对象类
paragraph9.setSpacingBefore(12);
cell3.addElement(paragraph9);
table.addCell(cell3);

PdfPTable table = new PdfPTable(3);
table.setLockedWidth(true);
table.setWidthPercentage(100);
float[] columnWidths = {177,176,176};//采用点数制单位
table.setTotalWidth(columnWidths);

String imageBase64Data = Base64DataUtils.getData(imageDataKeyName);
Image image = Image.getInstance(Base64.decodeBase64(imageBase64Data.getBytes()));
image.scaleToFit(140F, 70F);
PdfPCell cell = new PdfPCell(image, false);
cell.setBorder(0);
//TODO ...

Image image = Image.getInstance(Base64.decodeBase64(imageBase64Data.getBytes()));
image.setAbsolutePosition(400, 30);//以左下角作为原点的坐标平面上的绝对位置
image.scaleToFit(150, 150);//相对尺寸范围，图片会缩放成这个范围内的最大尺寸
document.add(image);

PdfReader reader = new PdfReader(TEMPLATE_FILE_FULL_PATH);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
PdfStamper ps = new PdfStamper(reader, bos);
PdfContentByte overContent = ps.getOverContent(8);
//...
Image image = Image.getInstance(Base64.decodeBase64(imageBase64Data.getBytes()));
image.setAbsolutePosition(posX, posY);
image.scaleToFit(scaleFitW, scaleFitH);
overContent.addImage(image);

BaseFont bfFangSong = BaseFont.createFont(
		"fonts/SIMFANG.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED
), bf;//这里ttf就跟代码放到一起
bf = bfFangSong;
Font font1 = new Font(bf, 10);//字体大小
Paragraph paragraph1 = new Paragraph("中文字符", font1);
PdfPCell cell1 = new PdfPCell();
cell1.setBorder(0);
cell1.addElement(paragraph1);
PdfPTable table = new PdfPTable(1);
table.setWidthPercentage(100);
table.addCell(cell1);

//通过 PdfReader 和 ByteArrayOutputStream 来生成 PdfStamper 实例
PdfReader reader = new PdfReader(TEMPLATE_FILE_FULL_PATH);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
PdfStamper ps = new PdfStamper(reader, bos);
//获取到所有的表单域
AcroFields s = ps.getAcroFields();
//也可以设置表单域的字体
BaseFont bfFangSong = BaseFont.createFont(
		FONT_FANG_SONG, BaseFont.IDENTITY_H, BaseFont.EMBEDDED
), bf;
bf = bfFangSong;
ArrayList<BaseFont> fontList = new ArrayList<BaseFont>();
fontList.add(bf);
s.setSubstitutionFonts(fontList);
//插值
Map<String, Item> fieldsMap = s.getFields();
Set<String> keySet = fieldsMap.keySet();
for (String key : keySet) {
	s.setField(key, filedValues.getString(key, ""));
}
ps.setFormFlattening(true);
//导出
	ps.close();
try {
	fos = new FileOutputStream(saveFileFullPath);
	fos.write(bos.toByteArray());
    fos.flush();
} catch (Exception e) {
	e.printStackTrace();
	throw e;
} finally {
	if (null != fos) {
		fos.close();
	}
}

package com.ailk.server.util;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.itextpdf.text.Document;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfWriter;
/**
 * pdf文件拼接工具 2017-01-10
 *
 */
public class iTextPdfConcatUtils {
	/**
	 * 拼接多个pdf文件
	 * 
	 * @param path1
	 * @param path2
	 */
	public static void concatPDFs(
			List<InputStream> streamOfPDFFiles,
			OutputStream outputStream, 
			boolean paginate
	) {
		Document document = new Document();
		try {
			List<InputStream> pdfs = streamOfPDFFiles;
			List<PdfReader> readers = new ArrayList<PdfReader>();
			int totalPages = 0;
			Iterator<InputStream> iteratorPDFs = pdfs.iterator();
			// Create Readers for the pdfs.
			while (iteratorPDFs.hasNext()) {
				InputStream pdf = iteratorPDFs.next();
				PdfReader pdfReader = new PdfReader(pdf);
				readers.add(pdfReader);
				totalPages += pdfReader.getNumberOfPages();
			}
			// Create a writer for the outputstream
			PdfWriter writer = PdfWriter.getInstance(document, outputStream);
			document.open();
			BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
					BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
			PdfContentByte cb = writer.getDirectContent(); // Holds the PDF
			// data
			PdfImportedPage page;
			int currentPageNumber = 0;
			int pageOfCurrentReaderPDF = 0;
			Iterator<PdfReader> iteratorPDFReader = readers.iterator();
			// Loop through the PDF files and add to the output.
			while (iteratorPDFReader.hasNext()) {
				PdfReader pdfReader = iteratorPDFReader.next();
				// Create a new page in the target for each source page.
				while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {
					document.newPage();
					pageOfCurrentReaderPDF++;
					currentPageNumber++;
					page = writer.getImportedPage(pdfReader,
							pageOfCurrentReaderPDF);
					cb.addTemplate(page, 0, 0);
					// Code for pagination.
					if (paginate) {
						cb.beginText();
						cb.setFontAndSize(bf, 9);
						cb.showTextAligned(PdfContentByte.ALIGN_CENTER, ""
								+ currentPageNumber + " of " + totalPages, 520,
								5, 0);
						cb.endText();
					}
				}
				pageOfCurrentReaderPDF = 0;
			}
			outputStream.flush();
			document.close();
			outputStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (document.isOpen())
				document.close();
			try {
				if (outputStream != null)
					outputStream.close();
			} catch (IOException ioe) {
				ioe.printStackTrace();
			}
		}
	}
	public static void main(String[] args) throws Exception {
		List<InputStream> streamOfPDFFiles = new ArrayList<InputStream>();
		streamOfPDFFiles.add(new FileInputStream("D:\\temp\\fileCache\\demo-1.pdf"));
		streamOfPDFFiles.add(new FileInputStream("D:\\temp\\fileCache\\demo-2.pdf"));
		OutputStream outputStream = new FileOutputStream(
				"D:\\temp\\" + System.currentTimeMillis() + ".pdf"
		);
		iTextPdfConcatUtils.concatPDFs(streamOfPDFFiles, outputStream , false);
	}
}