前言：
在当今数字化时代，随着电子文档的广泛应用，保护文档的安全性和完整性变得尤为重要。为了防止文档被盗用、篡改或未经授权的复制，添加水印成为一种常见的解决方案。
水印作为一种可见或隐形的标记，可以为文档增加额外的信息或标识，从而提高文档的可信度和可辨识性。无论是在商业领域中保护机密文件，还是在学术界中保护研究成果的版权，添加水印都发挥着重要的作用。
在本文中，我们将探讨如何使用Java技术实现在Word和PDF文件中添加水印。
pdf文件添加水印:
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| package test;
import com.itextpdf.text.Element;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;
import javax.swing.*;
import java.awt.*;
import java.io.FileOutputStream;
/**
* @author weixinxin 2024-01-24
**/
public class textWaterMark {
public static void main(String[] args) {
String waterMark = "内部使用";
String filePath = "C:\\Users\\weixinxin_ext\\Desktop\\FLEET10463_湖北小柚智行汽车科技有限公司_20240123_GUA 保证协议-甜猫_replace_加密.pdf";
String outFilePath = "C:\\Users\\weixinxin_ext\\Desktop\\添加多行文字水印_replace_加密_水印.pdf";
addPdfWatermark(filePath, outFilePath, waterMark);
}
public static void addPdfWatermark(String inputFile, String outputFile, String waterMarkName) {
try {
// 水印的高和宽（参数可调节）
int textH = 75;
int textW = 170;
// 间隔距离（参数可调节）
int interval = 30;
String owerPwd = "111";
String userWpd = "222";
PdfReader reader = new PdfReader(inputFile);
PdfReader.unethicalreading = true;
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputFile));
//userWpd 文件加密（打开文件密码）；owerPwd 操作加密（文件操作密码）； permissions = 4 能打印不能复制
//stamper.setEncryption(userWpd.getBytes(),owerPwd.getBytes(),4,false);
BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
PdfGState gs = new PdfGState();
gs.setFillOpacity(0.2f);
gs.setStrokeOpacity(0.4f);
int total = reader.getNumberOfPages() + 1;
JLabel label = new JLabel();
label.setText(waterMarkName);
PdfContentByte under;
Rectangle pageRect = null;
FontMetrics metrics;
label.setText(waterMarkName);
metrics = label.getFontMetrics(label.getFont());
for (int i = 1; i < total; i++) {
pageRect = reader.getPageSizeWithRotation(i);
// 在内容上方加水印
under = stamper.getOverContent(i);
// 在内容下方加水印
//under = stamper.getUnderContent(i);
under.saveState();
under.setGState(gs);
under.beginText();
under.setFontAndSize(base, 20);
// 水印文字成30度角倾斜
for (int height = interval + textH; height < pageRect.getHeight();
height = height + textH * 3) {
for (int width = interval + textW; width < pageRect.getWidth() + textW;
width = width + textW * 2) {
under.showTextAligned(Element.ALIGN_LEFT
, waterMarkName, width - textW,
height - textH, 30);
}
}
under.endText();
}
stamper.close();
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
|
结果：
word文件添加水印：
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| package com.atxinxin;
import com.itextpdf.text.Element;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;
import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.HeaderFooter;
import com.spire.doc.Section;
import com.spire.doc.documents.Paragraph;
import com.spire.doc.documents.ShapeLineStyle;
import com.spire.doc.documents.ShapeType;
import com.spire.doc.fields.ShapeObject;
import javax.swing.*;
import java.awt.*;
import java.io.FileOutputStream;
/**
* @author weixinxin 2024-01-26
**/
public class WaterMark {
public static void main(String[] args) {
String waterMark = "内部使用";
String filePath = "C:\\Users\\weixinxin_ext\\Desktop\\测试word转pdf.docx";
String outFilePath = "C:\\Users\\weixinxin_ext\\Desktop\\测试word转pdf-水印.docx";
addWordWaterMark(filePath,outFilePath,waterMark);
}
private static void addWordWaterMark(String filePath, String outFilePath,String waterMark) {
Document doc = new Document();
doc.loadFromFile(filePath);
ShapeObject shape = new ShapeObject(doc, ShapeType.Text_Plain_Text);
shape.setWidth(60);
shape.setHeight(20);
//设置艺术字文本内容、位置及样式
shape.setVerticalPosition(30);
shape.setHorizontalPosition(20);
shape.setRotation(315);
shape.getWordArt().setFontFamily("宋体");
shape.getWordArt().setText(waterMark);
shape.setFillColor(new Color(255, 255, 255));
shape.setLineStyle(ShapeLineStyle.Single);
shape.setStrokeColor(new Color(185, 181, 181, 204));
shape.setStrokeWeight(1);
Section section;
HeaderFooter header;
for (int n = 0; n < doc.getSections().getCount(); n++) {
section = doc.getSections().get(n);
header = section.getHeadersFooters().getHeader();
Paragraph paragraph;
if (header.getParagraphs().getCount() 0) {
paragraph = header.getParagraphs().get(0);
} else {
paragraph = header.addParagraph();
}
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 4; j++) {
shape = (ShapeObject) shape.deepClone();
shape.setVerticalPosition(60 + 200 * i);
shape.setHorizontalPosition(50 + 200 * j);
paragraph.getChildObjects().add(shape);
}
}
}
//保存文档
doc.saveToFile(outFilePath, FileFormat.Docx_2013);
}
}
|
结果：
参考
基于java技术实现word、pdf文件添加水印
