目录需求背景itext 的使用依赖简单示例基础设置（页面大小、边距、字体等）
段落内部，特殊设置关键字 字体或颜色生成动态表格页脚展示页数其他设置密码添加水印（背景图）
目录Header, Footer分割 PDF合并 PDF总结需求背景在工作中经常会有生成pdf文件的需求，大多数情况下，我们只需要使用pdf模版添加表单域，就足以胜任了。但是有一些特殊的需求，需要生成较为复杂的文件，如动态数据表格、插入图像等。
这时候，我们就可以使用拼接的方式，将pdf文件内容一段段拼上去，组合成一个pdf文件，来灵活的操纵文件的排版与内存形式。
itext 的使用依赖 简单示例生成一个内容为“Hello World”的pdf文件import com.itextpdf.text.*;import com.itextpdf.text.pdf.PdfWriter;
import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.util.logging.Level;import java.util.logging.Logger;
/*** 生成一个内容为“Hello World”的pdf文件* @author ym*/ public class HelloWorld {
public static void main(String[] args) {String FILE_DIR = "./"; // 项目根目录：盘符:/.../.../项目名称，注意：点号并不表示当前类文件所在的目录，而是项目目录下//Step 1—Create a Document.
Document document = new Document();try {//Step 2—Get a PdfWriter instance.
PdfWriter.getInstance(document, new FileOutputStream(FILE_DIR + "createSamplePDF.pdf"));//Step 3—Open the Document.
document.open();//Step 4—Add content.
document.add(new Paragraph("Hello World"));//Step 5—Close the Document.
document.close();} catch (DocumentException ex) {Logger.getLogger(HelloWorld.class.getName()).log(Level.SEVERE, null, ex);} catch (FileNotFoundException ex) {Logger.getLogger(HelloWorld.class.getName()).log(Level.SEVERE, null, ex);}}}基础设置（页面大小、边距、字体等）
//页面大小Rectangle rect = new Rectangle(PageSize.A4.rotate());//页面背景色rect.setBackgroundColor(BaseColor.ORANGE);// page , 外边距 marginLeft marginRight marginTop marginBottom Document doc = new Document(rect,90, 90, 30, 40);// 新开一页doc.newPage();
/*** 段落设置*/ Paragraph titleParagraph = new Paragraph("hello world!", getChineseTitleFont());titleParagraph.setAlignment(Element.ALIGN_CENTER);// 居中titleParagraph.setFirstLineIndent(24);// 首行缩进titleParagraph.setLeading(35f);// 行间距titleParagraph.setSpacingBefore(5f);// 设置上空白titleParagraph.setSpacingAfter(10f);// 设置段落下空白
//支持中文 设置字体，字体颜色、大小等public Font getChineseTitleFont() throws RuntimeException {Font ChineseFont = null;try {/*** name – the name of the font or its location on file* encoding – the encoding to be applied to this font* embedded – true if the font is to be embedded in the PDF*/ BaseFont simpChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);ChineseFont = new Font(simpChinese, 15, Font.BOLD, BaseColor.BLACK);} catch (DocumentException e) {log.error("getChineseFont" ,"字体异常",e);throw new RuntimeException("getChineseFont字体异常",e);} catch (IOException e) {log.error("getChineseFont" ,"字体异常",e);throw new RuntimeException("getChineseFont字体异常",e);}return ChineseFont;}段落内部，特殊设置关键字 字体或颜色// 文本内容String content = "This is a sample text with different colors.";String[] words = content.split(" "); // 将文本拆分为单词
for (String word : words) {Chunk chunk = new Chunk(word); // 创建一个新的 Chunk
// 如果单词是 "different"，则设置为红色if (word.equals("different")) {chunk.setForegroundColor(BaseColor.RED);}
// 如果单词是 "colors."，则设置为蓝色if (word.equals("colors.")) {chunk.setForegroundColor(BaseColor.BLUE);}
contentParagraph.add(chunk); // 将 Chunk 添加到段落中contentParagraph.add(" "); // 添加单词之间的空格}
document.add(contentParagraph); // 将段落添加到文档中生成动态表格// 创建一个包含5列的表格PdfPTable table = new PdfPTable(5);
// 添加表头table.addCell("Header 1");table.addCell("Header 2");table.addCell("Header 3");table.addCell("Header 4");table.addCell("Header 5");
// 添加动态数据到表格for (int i = 0; i < 10; i++) {table.addCell("Data " + i + ", 1");table.addCell("Data " + i + ", 2");table.addCell("Data " + i + ", 3");table.addCell("Data " + i + ", 4");table.addCell("Data " + i + ", 5");}
document.add(table);
/*** 如果需要更精细的控制属性*/ cell = new PdfPCell(new Phrase("title1",fontChinese));cell.setColspan(1);//设置所占列数cell.setRowspan(1);//合并行cell.setHorizontalAlignment(Element.ALIGN_CENTER);//设置水平居中cell.setVerticalAlignment(Element.ALIGN_MIDDLE);//设置垂直居中cell.setFixedHeight(30);//设置高度table.addCell(cell);页脚展示页数PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(FILE_DIR + "createSamplePDF.pdf"));writer.setPageEvent(new FooterEvent());
public class FooterEvent extends PdfPageEventHelper {//总页数PdfTemplate totalPage;//字体Font font;
{try {BaseFont chinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);font = new Font(chinese,10);} catch (DocumentException | IOException e) {e.printStackTrace();}}
//打开文档时，创建一个总页数的模版@Override
public void onOpenDocument(PdfWriter writer, Document document) {PdfContentByte cb = writer.getDirectContent();totalPage = cb.createTemplate(50, 9);}
@Override public void onEndPage(PdfWriter writer, Document document) {//创建一个两列的表格PdfPTable table = new PdfPTable(2);try {table.setTotalWidth(PageSize.A4.getWidth());//总宽度为A4纸张宽度table.setLockedWidth(true);//锁定列宽table.setWidths(new int[]{50, 50});//设置每列宽度PdfPCell cell = new PdfPCell(new Phrase("第"+document.getPageNumber() + " 页，共", font));cell.setHorizontalAlignment(Element.ALIGN_RIGHT);//设置水平右对齐cell.setVerticalAlignment(Element.ALIGN_MIDDLE);//设置垂直居中cell.disableBorderSide(15);//隐藏全部边框table.addCell(cell);PdfPCell cell1 = new PdfPCell(Image.getInstance(totalPage));//共 页cell1.setHorizontalAlignment(Element.ALIGN_LEFT);//设置水平左对齐cell1.setVerticalAlignment(Element.ALIGN_MIDDLE);//设置垂直居中cell1.disableBorderSide(15);//隐藏全部边框table.addCell(cell1);table.writeSelectedRows(0, -1, 0, 30, writer.getDirectContent());} catch (Exception e) {throw new ExceptionConverter(e);}}@Override public void onCloseDocument(PdfWriter writer, Document document) {String text = "" +String.valueOf(writer.getPageNumber()) +"页";ColumnText.showTextAligned(totalPage, Element.ALIGN_MIDDLE, new Paragraph(text, font), 0, 0, 0);}}其他设置密码PdfWriter writer = PdfWriter.getInstance(doc, out);
// 设置密码为："World"writer.setEncryption("Hello".getBytes(), "World".getBytes(),PdfWriter.ALLOW_SCREENREADERS,PdfWriter.STANDARD_ENCRYPTION_128);
doc.open();doc.add(new Paragraph("Hello World"));添加水印（背景图）
//图片水印PdfReader reader = new PdfReader(FILE_DIR + "setWatermark.pdf");PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(FILE_DIR+ "setWatermark2.pdf"));
Image img = Image.getInstance("resource/watermark.jpg");img.setAbsolutePosition(200, 400);PdfContentByte under = stamp.getUnderContent(1);under.addImage(img);
//文字水印PdfContentByte over = stamp.getOverContent(2);over.beginText();BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI,BaseFont.EMBEDDED);over.setFontAndSize(bf, 18);over.setTextMatrix(30, 30);over.showTextAligned(Element.ALIGN_LEFT, "DUPLICATE", 230, 430, 45);over.endText();
//背景图Image img2 = Image.getInstance("resource/test.jpg");img2.setAbsolutePosition(0, 0);PdfContentByte under2 = stamp.getUnderContent(3);under2.addImage(img2);
stamp.close();reader.close();目录// Code 1 document.add(new Chunk("Chapter 1").setLocalDestination("1"));
document.newPage();document.add(new Chunk("Chapter 2").setLocalDestination("2"));document.add(new Paragraph(new Chunk("Sub 2.1").setLocalDestination("2.1")));document.add(new Paragraph(new Chunk("Sub 2.2").setLocalDestination("2.2")));
document.newPage();document.add(new Chunk("Chapter 3").setLocalDestination("3"));
// Code 2 PdfContentByte cb = writer.getDirectContent();PdfOutline root = cb.getRootOutline();
// Code 3@SuppressWarnings("unused") PdfOutline oline1 = new PdfOutline(root, PdfAction.gotoLocalPage("1", false), "Chapter 1");
PdfOutline oline2 = new PdfOutline(root, PdfAction.gotoLocalPage("2", false), "Chapter 2");oline2.setOpen(false);
@SuppressWarnings("unused") PdfOutline oline2_1 = new PdfOutline(oline2, PdfAction.gotoLocalPage("2.1", false), "Sub 2.1");@SuppressWarnings("unused") PdfOutline oline2_2 = new PdfOutline(oline2, PdfAction.gotoLocalPage("2.2", false), "Sub 2.2");
@SuppressWarnings("unused") PdfOutline oline3 = new PdfOutline(root, PdfAction.gotoLocalPage("3", false), "Chapter 3");
Header, FooterPdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(FILE_DIR + "setHeaderFooter.pdf"));
writer.setPageEvent(new PdfPageEventHelper() {
public void onEndPage(PdfWriter writer, Document document) {
PdfContentByte cb = writer.getDirectContent();cb.saveState();
cb.beginText();BaseFont bf = null;try {bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.EMBEDDED);} catch (Exception e) {e.printStackTrace();}cb.setFontAndSize(bf, 10);
//Header float x = document.top(-20);
//左cb.showTextAligned(PdfContentByte.ALIGN_LEFT,"H-Left",document.left(), x, 0);//中cb.showTextAligned(PdfContentByte.ALIGN_CENTER,writer.getPageNumber()+ " page",(document.right() + document.left())/2,x, 0);//右cb.showTextAligned(PdfContentByte.ALIGN_RIGHT,"H-Right",document.right(), x, 0);
//Footer float y = document.bottom(-20);
//左cb.showTextAligned(PdfContentByte.ALIGN_LEFT,"F-Left",document.left(), y, 0);//中cb.showTextAligned(PdfContentByte.ALIGN_CENTER,writer.getPageNumber()+" page",(document.right() + document.left())/2,y, 0);//右cb.showTextAligned(PdfContentByte.ALIGN_RIGHT,"F-Right",document.right(), y, 0);
cb.endText();
cb.restoreState();}});
doc.open();doc.add(new Paragraph("1 page"));doc.newPage();doc.add(new Paragraph("2 page"));doc.newPage();doc.add(new Paragraph("3 page"));doc.newPage();doc.add(new Paragraph("4 page"));分割 PDFFileOutputStream out = new FileOutputStream(FILE_DIR + "splitPDF.pdf");
Document document = new Document();
PdfWriter.getInstance(document, out);
document.open();document.add(new Paragraph("1 page"));
document.newPage();document.add(new Paragraph("2 page"));
document.newPage();document.add(new Paragraph("3 page"));
document.newPage();document.add(new Paragraph("4 page"));
document.close();
PdfReader reader = new PdfReader(FILE_DIR + "splitPDF.pdf");
Document dd = new Document();PdfWriter writer = PdfWriter.getInstance(dd, new FileOutputStream(FILE_DIR + "splitPDF1.pdf"));dd.open();PdfContentByte cb = writer.getDirectContent();dd.newPage();cb.addTemplate(writer.getImportedPage(reader, 1), 0, 0);dd.newPage();cb.addTemplate(writer.getImportedPage(reader, 2), 0, 0);dd.close();writer.close();
Document dd2 = new Document();PdfWriter writer2 = PdfWriter.getInstance(dd2, new FileOutputStream(FILE_DIR + "splitPDF2.pdf"));dd2.open();PdfContentByte cb2 = writer2.getDirectContent();dd2.newPage();cb2.addTemplate(writer2.getImportedPage(reader, 3), 0, 0);dd2.newPage();cb2.addTemplate(writer2.getImportedPage(reader, 4), 0, 0);dd2.close();writer2.close();合并 PDFPdfReader reader1 = new PdfReader(FILE_DIR + "splitPDF1.pdf");PdfReader reader2 = new PdfReader(FILE_DIR + "splitPDF2.pdf");
FileOutputStream out = new FileOutputStream(FILE_DIR + "mergePDF.pdf");
Document document = new Document();PdfWriter writer = PdfWriter.getInstance(document, out);
document.open();PdfContentByte cb = writer.getDirectContent();
int totalPages = 0;totalPages += reader1.getNumberOfPages();totalPages += reader2.getNumberOfPages();
java.util.List
int pageOfCurrentReaderPDF = 0;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++;PdfImportedPage page = writer.getImportedPage(pdfReader, pageOfCurrentReaderPDF);cb.addTemplate(page, 0, 0);}pageOfCurrentReaderPDF = 0;}out.flush();document.close();out.close();总结以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。
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