81 lines
2.8 KiB
Java
81 lines
2.8 KiB
Java
package com.adc.da.util;
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import com.itextpdf.text.BaseColor;
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import com.itextpdf.text.Element;
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import com.itextpdf.text.Rectangle;
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import com.itextpdf.text.pdf.*;
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import java.io.FileOutputStream;
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import java.lang.reflect.Field;
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/**
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* @Description:水印
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* @Author: super_liu
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* date: 2020/1/10 15:42
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*/
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public class WaterMarkUtil {
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/**
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* @param inputFile 你的PDF文件地址
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* @param outputFile 添加水印后生成PDF存放的地址
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* @param waterMarkName 你的水印
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* @return
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*/
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public static boolean waterMark(String inputFile,
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String outputFile, String waterMarkName) {
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try {
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PdfReader reader = new PdfReader(inputFile);
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Field f = PdfReader.class.getDeclaredField("encrypted");
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f.setAccessible(true);
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f.set(reader, Boolean.FALSE);
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PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(
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outputFile));
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//这里的字体设置比较关键，这个设置是支持中文的写法
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BaseFont base = BaseFont.createFont("STSong-Light",
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"UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系统字体
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int total = reader.getNumberOfPages() + 1;
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PdfContentByte under;
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Rectangle pageRect = null;
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for (int i = 1; i < total; i++) {
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pageRect = stamper.getReader().
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getPageSizeWithRotation(i);
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// 计算水印X,Y坐标
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// float x = pageRect.getWidth()/10;
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// float y = pageRect.getHeight()/10-10;
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// 获得PDF最顶层
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under = stamper.getOverContent(i);
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under.saveState();
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// set Transparency
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PdfGState gs = new PdfGState();
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// 设置透明度为0.2
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gs.setFillOpacity(0.25f);
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under.setGState(gs);
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under.restoreState();
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under.beginText();
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under.setFontAndSize(base, 50);
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under.setTextMatrix(30, 30);
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under.setColorFill(BaseColor.LIGHT_GRAY);
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for (int y = 0; y < 5; y++) {
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for (int x = 0; x < 10; x++) {
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// 水印文字成45度角倾斜
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under.showTextAligned(Element.ALIGN_LEFT
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, waterMarkName, 100 + 300 * x, 300 * y, 40);
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}
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}
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// 添加水印文字
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under.endText();
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under.setLineWidth(1f);
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under.stroke();
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}
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stamper.close();
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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}
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