java给图片增加水印工具包

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我是靠谱客的博主单纯机器猫，最近开发中收集的这篇文章主要介绍java给图片增加水印工具包，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

需要itextPdfjar文件

<!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.13</version>
</dependency>

代码片段

package cn.jeeweb.common.utils;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.pdf.*;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
public class PdfWatermarkUtils {
/**
* 为pdf文件加水印(根据水印文字)
*
* @param sourcePath
* @param targetPath
* @param waterMarkName
* @throws IOException
* @throws DocumentException
*/
public static void setWatermark(String sourcePath,
String targetPath, String waterMarkName)
throws IOException, DocumentException {
setWatermark(sourcePath,targetPath,waterMarkName,1);
}
/**
* 为pdf文件加水印(根据水印文字)
*
* @param sourcePath
* @param targetPath
* @param waterMarkName
* @param opacity
* @throws IOException
* @throws DocumentException
*/
public static void setWatermark(String sourcePath,
String targetPath, String waterMarkName, float opacity)
throws IOException, DocumentException {
byte[] bytes=FileUtil.toByteArray(sourcePath);
OutputStream outPutStream = FileUtil.openOutputStream(new File(targetPath));
PdfReader pr = new PdfReader(bytes, "PDF".getBytes());
// 获取文件页数
int pageSize = pr.getNumberOfPages();
PdfStamper stam = new PdfStamper(pr, outPutStream);
PdfContentByte content = null;
// 设置字体BaseFont下有多个字体可选
BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",
BaseFont.EMBEDDED);
PdfGState gs = new PdfGState();
// 设置透明度(填充不透明度)
gs.setFillOpacity(opacity);
for (int i = 1; i <= pageSize; i++) {
content = stam.getOverContent(i);// 在内容上方加水印
// content = stam.getUnderContent(i);//在内容下方加水印
content.setGState(gs);
content.beginText();
content.setColorFill(BaseColor.LIGHT_GRAY);
content.setFontAndSize(base, 50);// 设置字体的大小
content.setTextMatrix(70, 200);
content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 100,
750, 45);// 宽，高，斜度
content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 250,
650, 45);
content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 350,
550, 45);
content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 200,
250, 45);
content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 350,
150, 45);
content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 500,
350, 45);
content.endText();
}
stam.close();
}
}