java pdf加水印的方法

本文实例为大家分享了java pdf加水印的具体代码,供大家参考,具体内容如下

引入依赖

<dependency>

<groupId>com.itextpdf.tool</groupId>

<artifactId>xmlworker</artifactId>

<version>5.5.10</version>

</dependency>

<dependency>

<groupId>com.itextpdf</groupId>

<artifactId>itextpdf</artifactId>

<version>5.5.10</version>

</dependency>

‘/static/fonts/SIMYOU.TTF' 字体 本机没有的话, 可以百度下载

/**

* pdf 加水印

*

* @return

*/

public byte[] pdfAddWaterMark(byte[] byes) {

String fileName = UUID.randomUUID().toString() + ".pdf";

String courseFile = "";

try {

// 第二种:获取项目路径 D:\git\daotie\daotie

//生成临时文件 , 读取完删除

File directory = new File("");// 参数为空

courseFile = directory.getCanonicalPath() + "/";

} catch (IOException e) {

e.printStackTrace();

}

byte[] returnBytes = null;

// 待加水印的文件

PdfReader reader = null;

PdfStamper stamper = null;

// ByteArrayOutputStream baos = null;

FileOutputStream os = null;

try {

reader = new PdfReader(byes);

// 加完水印的文件

// baos = new ByteArrayOutputStream();

// stamper = new PdfStamper(reader, baos);

// 加完水印的文件

os = new FileOutputStream(courseFile + fileName);

stamper = new PdfStamper(reader, os);

int total = reader.getNumberOfPages() + 1;

PdfContentByte content;

// BaseFont font = BaseFont.createFont();

BaseFont basefont = BaseFont.createFont("/static/fonts/SIMYOU.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);

//这里的字体设置比较关键,这个设置是支持中文的写法

/*BaseFont base = BaseFont.createFont("STSong-Light",

"UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系统字体*/

/*//设置透明度

PdfGState gs = new PdfGState();

gs.setFillOpacity(1f);

gs.setStrokeOpacity(1f);*/

PdfContentByte under;

com.itextpdf.text.Rectangle pageRect = null;

// 循环对每页插入水印

for (int i = 1; i < total; i++) {

pageRect = stamper.getReader().getPageSizeWithRotation(i);

// 计算水印X,Y坐标

float x = (float) (pageRect.getWidth() / 1.98);

float y = (float) (pageRect.getHeight() / 2.8);

// 获得PDF最顶层

under = stamper.getOverContent(i);

under.saveState();

// set Transparency

PdfGState gs = new PdfGState();

// 设置透明度为0.2

gs.setFillOpacity(1.f);

under.setGState(gs);

under.restoreState();

under.beginText();

under.setFontAndSize(basefont, pageRect.getHeight() / 17);

under.setColorFill(BaseColor.RED);

// 水印文字成45度角倾斜

System.out.println("width" + pageRect.getWidth());

System.out.println("height" + pageRect.getHeight());

System.out.println("x" + x);

System.out.println("y" + y);

under.showTextAligned(Element.ALIGN_CENTER, "图片仅供预览,不可用于商业用途", x, y, 45);

// 添加水印文字

under.endText();

under.setLineWidth(1f);

under.stroke();

}

// returnBytes = baos.toByteArray();

} catch (IOException e) {

e.printStackTrace();

} catch (DocumentException e) {

e.printStackTrace();

} finally {

try {

stamper.close();

if (os != null) {

os.close();

}

if (reader != null) {

reader.close();

}

} catch (DocumentException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

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