java生成PDF(iText)

添加依赖
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.11</version>
</dependency>

String DEST = "D:\\证书.pdf";
//建立com.lowagie.text.Document对象的实例
Document document = new Document();
 PdfWriter writer = null;
 try {
 	 //建立一个书写器(Writer)与document对象关联，通过书写器(Writer)可以将文档写入到磁盘中
     writer = PdfWriter.getInstance(document, new FileOutputStream(DEST));
     //打开文档
     document.open();
     //向文档中添加内容
     document.add(new Paragraph("hello"));
     document.add(new Paragraph("world"));
 } catch (Exception e) {
     e.printStackTrace();
 }
 //关闭文档
 document.close();
 writer.close();