itext之pdf导出添加水印Java工具类
import java.io.IOException; import com.itextpdf.text.Document; import com.itextpdf.text.DocumentException; import com.itextpdf.text.Element; import com.itextpdf.text.Font; import com.itextpdf.text.Image; import com.itextpdf.text.Phrase; import com.itextpdf.text.pdf.BaseFont; import com.itextpdf.text.pdf.ColumnText; import com.itextpdf.text.pdf.PdfContentByte; import com.itextpdf.text.pdf.PdfGState; import com.itextpdf.text.pdf.PdfPageEventHelper; import com.itextpdf.text.pdf.PdfWriter; public class PdfFileExportUtil { private static Font pdf8Font = null; private static Font pdf20Font = null; /** * * 设置PDF创建者信息 * * @param pdfDocument */ public static Document setCreatorInfo(Document pdfDocument) { if (pdfDocument == null) { return null; } // 文档属性 pdfDocument.addTitle("北京XX科技有限公司综合分析PDF文档"); pdfDocument.addAuthor("北京XX科技有限公司"); pdfDocument.addSubject("XX分析页"); pdfDocument.addKeywords("综合分析");// 文档关键字信息 pdfDocument.addCreator("XX数据平台");// 应用程序名称 return pdfDocument; } /** * * 获取中文字符集且是8号字体，常用作表格内容的字体格式 * * @param fullFilePath */ public static Font getChinese8Font() throws DocumentException, IOException { if (pdf8Font == null) { // 设置中文字体和字体样式 BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); pdf8Font = new Font(bfChinese, 8, Font.NORMAL); } return pdf8Font; } /** * * 获取中文字符集且是8号字体，常用作文字水印信息 * * @param fullFilePath */ public static Font getChinese20Font() throws DocumentException, IOException { if (pdf20Font == null) { // 设置中文字体和字体样式 BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); pdf20Font = new Font(bfChinese); pdf20Font.setSize(5); } return pdf20Font; } /** * * 设置成只读权限 * * @param pdfWriter */ public static PdfWriter setReadOnlyPDFFile(PdfWriter pdfWriter) throws DocumentException { pdfWriter.setEncryption(null, null, PdfWriter.ALLOW_PRINTING, PdfWriter.STANDARD_ENCRYPTION_128); return pdfWriter; } /** * * 变更一个图片对象的展示位置和角度信息 * * @param waterMarkImage * * @param xPosition * * @param yPosition * * @return */ public static Image getWaterMarkImage(Image waterMarkImage, float xPosition, float yPosition) { waterMarkImage.setAbsolutePosition(xPosition, yPosition);// 坐标 waterMarkImage.setRotation(-20);// 旋转 弧度 waterMarkImage.setRotationDegrees(-45);// 旋转 角度 waterMarkImage.scalePercent(100);// 依照比例缩放 return waterMarkImage; } /** * * 为PDF分页时创建添加文本水印的事件信息 */ public class TextWaterMarkPdfPageEvent extends PdfPageEventHelper { private String waterMarkText; public TextWaterMarkPdfPageEvent(String waterMarkText) { this.waterMarkText = waterMarkText; } public void onEndPage(PdfWriter writer, Document document) { try { float pageWidth = document.right() + document.left();// 获取pdf内容正文页面宽度 float pageHeight = document.top() + document.bottom();// 获取pdf内容正文页面高度 // 设置水印字体格式 Font waterMarkFont = PdfFileExportUtil.getChinese20Font(); PdfContentByte waterMarkPdfContent = writer.getDirectContent();//决定了水印图层高低 Phrase phrase = new Phrase(waterMarkText, waterMarkFont); for(int i = 0 ; i < 100; i ++){ for(int j = 0 ; j < 20 ; j ++ ){ ColumnText.showTextAligned(waterMarkPdfContent,Element.ALIGN_CENTER, phrase,pageWidth * 0.2f * j, pageHeight * 0.08f * i, 45); } } } catch (DocumentException de) { de.printStackTrace(); System.err.println("pdf watermark font:" + de.getMessage()); } catch (IOException de) { de.printStackTrace(); System.err.println("pdf watermark font:" + de.getMessage()); } } } /** * * 为PDF分页时创建添加图片水印的事件信息 */ public class PictureWaterMarkPdfPageEvent extends PdfPageEventHelper { private String waterMarkFullFilePath; private Image waterMarkImage; public PictureWaterMarkPdfPageEvent(String waterMarkFullFilePath) { this.waterMarkFullFilePath = waterMarkFullFilePath; } public void onEndPage(PdfWriter writer, Document document) { try { float pageWidth = document.right() + document.left();// 获取pdf内容正文页面宽度 float pageHeight = document.top() + document.bottom();// 获取pdf内容正文页面高度 PdfContentByte waterMarkPdfContent = writer.getDirectContent(); // 仅设置一个图片实例对象，整个PDF文档只应用一个图片对象，极大减少因为增加图片水印导致PDF文档大小增加 if (waterMarkImage == null) { waterMarkImage = Image.getInstance(waterMarkFullFilePath); } // 添加水印图片，文档正文内容采用横向三列，竖向两列模式增加图片水印 for(int i = 0 ; i < 100; i ++){ for(int j = 0 ; j < 4 ; j ++ ){ waterMarkPdfContent.addImage(getWaterMarkImage(waterMarkImage,pageWidth * 0.3f * j , pageHeight * 0.05f * i)); } } PdfGState gs = new PdfGState(); gs.setFillOpacity(0.8f);// 设置透明度为0.2 gs.setStrokeOpacity(0.8f); gs.setOverPrintStroking(true); waterMarkPdfContent.setGState(gs); } catch (DocumentException de) { de.printStackTrace(); System.err.println("pdf watermark font:" + de.getMessage()); } catch (IOException de) { de.printStackTrace(); System.err.println("pdf watermark font:" + de.getMessage()); } } } /** * * 为PDF分页时创建添加header和footer信息的事件信息 */ class HeadFootInfoPdfPageEvent extends PdfPageEventHelper { public HeadFootInfoPdfPageEvent() { } public void onEndPage(PdfWriter writer, Document document) { try { PdfContentByte headAndFootPdfContent = writer .getDirectContent(); headAndFootPdfContent.saveState(); headAndFootPdfContent.beginText(); BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); headAndFootPdfContent.setFontAndSize(bfChinese, 10); // 文档页头信息设置 float x = document.top(-20); // 页头信息左面 headAndFootPdfContent.showTextAligned( PdfContentByte.ALIGN_LEFT, "综合分析", document.left(), x, 0); // 页头信息中间 headAndFootPdfContent.showTextAligned( PdfContentByte.ALIGN_CENTER, "第" + writer.getPageNumber() + "页", (document.right() + document.left()) / 2, x, 0); // 页头信息右面 headAndFootPdfContent.showTextAligned( PdfContentByte.ALIGN_RIGHT, "北京XX科技有限公司", document.right(), x, 0); // 文档页脚信息设置 float y = document.bottom(-20); // 页脚信息左面 headAndFootPdfContent.showTextAligned( PdfContentByte.ALIGN_LEFT, "--", document.left(), y, 0); // 页脚信息中间 headAndFootPdfContent.showTextAligned( PdfContentByte.ALIGN_CENTER, "-", (document.right() + document.left()) / 2, y, 0); // 页脚信息右面 headAndFootPdfContent.showTextAligned( PdfContentByte.ALIGN_RIGHT, "--", document.right(), y, 0); headAndFootPdfContent.endText(); headAndFootPdfContent.restoreState(); } catch (DocumentException de) { de.printStackTrace(); System.err.println("pdf watermark font:" + de.getMessage()); } catch (IOException de) { de.printStackTrace(); System.err.println("pdf watermark font:" + de.getMessage()); } } } }
使用方法：
PdfFileExportUtil pdfFileExportUtil = new PdfFileExportUtil(); pdfWriter.setPageEvent(pdfFileExportUtil.new PictureWaterMarkPdfPageEvent(basePath+"/images/xxx.png"));
