/static/fonts/SIMYOU.TTF’ 字体

/**
* 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:gitdaotiedaotie
//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(http://www.amjmh.com/v/BIBRGZ_558768/);
} catch (IOException e) {
e.printStackTrace();
}
}
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