使用java创建pdf文档

PDF是一个很棒的跨平台的文件格式,纯java的方式,有2个很著名的library实现了pdf的创建和读取:

  • pdfbox 这是一个 Apache 旗下的开源项目。官网
  • iText 这是 IBM 推荐的开源项目。官网

两个都很好,我们这次选用iText 5来演示PDF的创建和加密。

主要依赖

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<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.12</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-pdfa</artifactId>
<version>5.5.12</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-xtra</artifactId>
<version>5.5.12</version>
</dependency>
<dependency>
<groupId>com.itextpdf.tool</groupId>
<artifactId>xmlworker</artifactId>
<version>5.5.12</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.50</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk15on</artifactId>
<version>1.50</version>
</dependency>

核心代码

代码中演示了常用的pdf元素:文本框,列表,表格,页眉页脚,加密。

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public class Test {
//自定义中文字体位置
private static final String fontPath = "./src/main/resources/Deng.ttf";
public static void main(String[] args) throws DocumentException, IOException {
Test test=new Test();
test.creatPdf();
test.manipulatePdf("test_cn.pdf", "test_cn_2.pdf");
}
private void creatPdf()throws DocumentException, IOException {
//创建基础字体
BaseFont bf = BaseFont.createFont(fontPath,BaseFont.IDENTITY_H,BaseFont.EMBEDDED);
//自定义字体属性
Font font = new Font(bf,30);
Font smallFont = new Font(bf,24);
Document document = new Document(PageSize.A4.rotate());
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("test_cn.pdf"));
writer.setPdfVersion(PdfWriter.PDF_VERSION_1_7);
//Make document tagged
//writer.setTagged();
//===============
writer.setViewerPreferences(PdfWriter.DisplayDocTitle);
document.addTitle("样例PDF");
writer.createXmpMetadata();
//footer and header
MyFooter event = new MyFooter();
writer.setPageEvent(event);
//=====================
document.open();
//paragraph段落
Paragraph p1 = new Paragraph("第一章",font);
p1.setAlignment(Element.ALIGN_CENTER);
document.add(p1);
//phrase
Phrase ph = new Phrase("一个短语\n",smallFont);
document.add(ph);
//separator
DottedLineSeparator separator = new DottedLineSeparator();
//separator.setPercentage(59500f / 523f);
Chunk linebreak = new Chunk(separator);
document.add(linebreak);
//paragraph
Paragraph p2 = new Paragraph("第二章",font);
p2.setAlignment(Element.ALIGN_CENTER);
p2.setSpacingBefore(10f);
document.add(p2);
//list
PdfPTable table = new PdfPTable(2);
table.setTotalWidth(200);
table.setWidths(new int[]{ 1, 10 });
table.setHorizontalAlignment(Element.ALIGN_LEFT);
PdfPCell cell;
cell = new PdfPCell();
cell.setBorder(PdfPCell.NO_BORDER);
cell.addElement(new Paragraph("标签",smallFont));
table.addCell(cell);
cell = new PdfPCell();
cell.setBorder(PdfPCell.NO_BORDER);
List list = new List(List.UNORDERED);
list.add(new ListItem(new Chunk("数值1",smallFont)));
list.add(new ListItem(new Chunk("数值2",smallFont)));
list.add(new ListItem(new Chunk("数值3",smallFont)));
cell.addElement(list);
table.addCell(cell);
table.setSpacingBefore(50f);
document.add(table);
Paragraph p3 = new Paragraph("第三章",font);
p3.setAlignment(Element.ALIGN_LEFT);
p3.add("\n");
p3.setTabSettings(new TabSettings(100f));
p3.add(new Chunk("卫宁健康",smallFont));
p3.add(Chunk.TABBING);
p3.add(new Chunk("卫宁健康",smallFont));
p3.add(Chunk.TABBING);
p3.add(new Chunk("卫宁健康",smallFont));
document.add(p3);
//table
PdfPTable table2 = new PdfPTable(8);
for(int aw = 0; aw < 16; aw++){
table2.addCell("hi");
}
table2.setSpacingBefore(10f);
document.add(table2);
document.close();
}
class MyFooter extends PdfPageEventHelper {
Font ffont = new Font(Font.FontFamily.UNDEFINED, 5, Font.ITALIC);
public void onEndPage(PdfWriter writer, Document document) {
PdfContentByte cb = writer.getDirectContent();
Phrase header = new Phrase("this is a header", ffont);
Phrase footer = new Phrase("this is a footer", ffont);
ColumnText.showTextAligned(cb, Element.ALIGN_CENTER,
header,
(document.right() - document.left()) / 2 + document.leftMargin(),
document.top() + 10, 0);
ColumnText.showTextAligned(cb, Element.ALIGN_CENTER,
footer,
(document.right() - document.left()) / 2 + document.leftMargin(),
document.bottom() - 10, 0);
}
}
private void manipulatePdf(String src, String dest) throws IOException, DocumentException {
PdfReader reader = new PdfReader(src);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
stamper.setEncryption("Hello".getBytes(), "World".getBytes(),
PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128 | PdfWriter.DO_NOT_ENCRYPT_METADATA);
stamper.close();
reader.close();
}
}

要点讲解

  • iText默认不支持中文,所以需要自己引入中文字体。code 第3行,第13行,第15行。
  • 页眉页脚需要用到event,继承PdfPageEventHelper类。code 第28行,第29行。第90行的内部类。
  • 加密是在生成pdf之后,调用setEncryption来完成。其中第一个参数是用户密码,第二个参数是所有者密码。第三个参数是用户权限,第四个参数是加密类型。

END