使用itext加图片水印或文字水印
概述：使用itext 技术给pdf加水印方法。
实现原理：在不管是流还是临时pdf 预览之前。需先 生成不带水印的pdf,然后在通过itext工具方法生成带水印的pdf
依赖jar包：i-text-asian.jar , itextpdf-5.5.10.jar
步骤一：做成工具类。
工具类代码及说明：分图片水印和文字水印，可根据具体需求使用。
package com.test.util;
import java.io.File;
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.BaseColor;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfCopy;
import com.itextpdf.text.pdf.PdfGState;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSmartCopy;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;
public class ProcessPDF {
public static void main(String[] args) {
try {
// List pdfs = new ArrayList();
// pdfs.add(new FileInputStream("e:\\123.pdf"));
// pdfs.add(new FileInputStream("e:\\456.pdf"));
// OutputStream output = new FileOutputStream("e:\\789.pdf");
// concatPDFs(pdfs, output, true);
ProcessPDF.addPdfImgMark("E:\\file2\\1502349579058.pdf",
"E:\\file2" + File.separator + "mark" + File.separator + "mark1111upGRAY.pdf",
"C:\\Users\\Administrator\\Desktop\\1127.png",
300,350);
ProcessPDF.addPdfTextMark("E:\\file2\\1502349579058.pdf",
"E:\\file2" + File.separator + "mark" + File.separator + "mark2222upGRAY.pdf", "水印文字", 300,
350);
} catch (Exception e) {
e.printStackTrace();
}
}
public static File mergeFiles(String[] files, String result, boolean smart) throws IOException, DocumentException {
Document document = new Document();
PdfCopy copy;
if (smart)
copy = new PdfSmartCopy(document, new FileOutputStream(result));
else
copy = new PdfCopy(document, new FileOutputStream(result));
document.open();
PdfReader[] reader = new PdfReader[files.length];
for (int i = 0; i < files.length; i++) {
reader[i] = new PdfReader(files[i]);
copy.addDocument(reader[i]);
copy.freeReader(reader[i]);
reader[i].close();
}
document.close();
return new File(result);
}
/**
* 合并pdf
*
* @param streamOfPDFFiles
* @param outputStream
* @param paginate
*/
public static void concatPDFs(List streamOfPDFFiles,
OutputStream outputStream, boolean paginate) {
Document document = new Document();
try {
List pdfs = streamOfPDFFiles;
List readers = new ArrayList();
int totalPages = 0;
Iterator 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 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();
}
}
}
/**
*
*
*
* Description: 给pdf文件添加水印
*
*
*
* @param InPdfFile
* 要加水印的原pdf文件路径
* @param outPdfFile
* 加了水印后要输出的路径
* @param markImagePath
* 水印图片路径
* @param imgWidth
* 图片横坐标
* @param imgHeight
* 图片纵坐标
* @throws Exception
* @see void
*/
public static void addPdfImgMark(String InPdfFile, String outPdfFile, String markImagePath,int imgWidth, int imgHeight) throws Exception {
PdfReader reader = new PdfReader(InPdfFile, "PDF".getBytes());
PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(new File(outPdfFile)));
PdfContentByte under;
PdfGState gs1 = new PdfGState();
gs1.setFillOpacity(0.3f);// 透明度设置
Image img = Image.getInstance(markImagePath);// 插入图片水印
img.setAbsolutePosition(imgWidth, imgHeight); // 坐标
img.setRotation(-20);// 旋转 弧度
img.setRotationDegrees(45);// 旋转 角度
// img.scaleAbsolute(200,100);//自定义大小
// img.scalePercent(50);//依照比例缩放
int pageSize = reader.getNumberOfPages();// 原pdf文件的总页数
for(int i = 1; i <= pageSize; i++) {
under = stamp.getUnderContent(i);// 水印在之前文本下
// under = stamp.getOverContent(i);//水印在之前文本上
under.setGState(gs1);// 图片水印 透明度
under.addImage(img);// 图片水印
}
stamp.close();// 关闭
// // 删除不带水印文件
// File tempfile = new File(InPdfFile);
// if(tempfile.exists()) {
// tempfile.delete();
// }
}
/**
*
*
*
* Description: 给pdf文件添加水印
*
* @param InPdfFile
* 要加水印的原pdf文件路径
* @param outPdfFile
* 加了水印后要输出的路径
* @param textMark
* 水印文字
* @param textWidth
* 文字横坐标
* @param textHeight
* 文字纵坐标
* @throws Exception
* @see void
*/
public static void addPdfTextMark(String InPdfFile, String outPdfFile, String textMark,int textWidth,
int textHeight) throws Exception {
PdfReader reader = new PdfReader(InPdfFile, "PDF".getBytes());
PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(new File(outPdfFile)));
PdfContentByte under;
BaseFont font = BaseFont.createFont("C:/WINDOWS/Fonts/SIMSUN.TTC,1", "Identity-H", true);// 使用系统字体
int pageSize = reader.getNumberOfPages();// 原pdf文件的总页数
for(int i = 1; i <= pageSize; i++) {
under = stamp.getUnderContent(i);// 水印在之前文本下
// under = stamp.getOverContent(i);//水印在之前文本上
under.beginText();
under.setColorFill(BaseColor.GRAY);// 文字水印 颜色
under.setFontAndSize(font, 38);// 文字水印 字体及字号
under.setTextMatrix(textWidth, textHeight);// 文字水印 起始位置
under.showTextAligned(Element.ALIGN_CENTER, textMark, textWidth, textHeight, 45);
under.endText();
}
stamp.close();// 关闭
}
}
注意事项：文字水印方法中，字体的文件路径
步骤二：在合适的地方调用上述工具方法
public static void main(String[] args) {
try {
// List pdfs = new ArrayList();
// pdfs.add(new FileInputStream("e:\\123.pdf"));
// pdfs.add(new FileInputStream("e:\\456.pdf"));
// OutputStream output = new FileOutputStream("e:\\789.pdf");
// concatPDFs(pdfs, output, true);
ProcessPDF.addPdfImgMark("E:\\file2\\1502349579058.pdf",
"E:\\file2" + File.separator + "mark" + File.separator + "mark1111upGRAY.pdf",
"C:\\Users\\Administrator\\Desktop\\1127（图片水印）.png",
300,350);
ProcessPDF.addPdfTextMark("E:\\file2\\1502349579058.pdf",
"E:\\file2" + File.separator + "mark" + File.separator + "mark2222upGRAY.pdf", "要加的水印文字", 300, 350);
} catch (Exception e) {
e.printStackTrace();
}
}