itext给pdf文件添加居中水印

谁能帮我注解的再详细点 求高手
@SuppressWarnings("static-access")
public static void addStamp(String pdfPath,String sPdfPath, String projectID, String type, String abs,String stampStr) {
PdfReader reader = null;
PdfStamper stamp = null;
try {
reader = new PdfReader(pdfPath); // ("h:\\ITextTest.pdf",
// "World".getBytes());,后面的表示含有密码
stamp = new PdfStamper(reader, new FileOutputStream(sPdfPath));
BaseFont bfChinese = BaseFont.createFont("STSong-Light",
"UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
// Font fontChinese=new Font(bfChinese,12,Font.NORMAL,BaseColor.RED);
int total = reader.getNumberOfPages();
float pageWidth =0;
float pageHeight=0;
PdfContentByte under=null;
int fontSize=11;

public class StampStationery {
public static final String filename = "F://demo.pdf";
public static void main(String[] args) throws IOException,
DocumentException{
Document document = new Document(new Rectangle(400, 400));
PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream(filename));
document.open();
PdfContentByte cb = writer.getDirectContent();
String content = "hello word!";
cb.beginText();
Font f = new Font();
f.setSize(18);
Phrase p = new Phrase(content, f);
//(100,200) 是x,y坐标 45 是偏移角度 字体的演示自己设置
ColumnText.showTextAligned(cb, 0, p, 100, 200, 45);
cb.endText();
document.close();
}
}

首先需要的jar包为itext-2.1.2u.jar、itextasian.jar。 import java.awt.color; import java.io.bufferedoutputstream; import java.io.file; import java.io.fileoutputstream; import java.io.ioexception; import java.text.simpledateformat; import java.util.calendar; import com.lowagie.text.documentexception; import com.lowagie.text.element; import com.lowagie.text.pdf.basefont; import com.lowagie.text.pdf.pdfcontentbyte; import com.lowagie.text.pdf.pdfgstate; import com.lowagie.text.pdf.pdfreader; import com.lowagie.text.pdf.pdfstamper; public class testwaterprint { public static void main(string[]args) throws documentexception, ioexception{ //要输出的pdf文件 bufferedoutputstream bos = new bufferedoutputstream(new fileoutputstream(new file("e:/abc.pdf"))); calendar cal = calendar.getinstance(); simpledateformat format = new simpledateformat("yyyy-mm-dd hh:mm:ss"); //将pdf文件先加水印然后输出 setwatermark(bos,"e:/pdf源文件.pdf",format.format(cal.gettime()) + " 下载使用人：" + "测试user", 16); } public static void setwatermark(bufferedoutputstream bos, string input, string watermarkname, int permission) throws documentexception, ioexception { pdfreader reader = new pdfreader(input); pdfstamper stamper = new pdfstamper(reader, bos); int total = reader.getnumberofpages() + 1; pdfcontentbyte content; basefont base = basefont.createfont("stsong-light", "unigb-ucs2-h", basefont.embedded); pdfgstate gs = new pdfgstate(); for (int i = 1; i < total; i++) { content = stamper.getovercontent(i);//在内容上方加水印 //content = stamper.getundercontent(i);//在内容下方加水印 gs.setfillopacity(0.2f); // content.setgstate(gs); content.begintext(); content.setcolorfill(color.light_gray); content.setfontandsize(base, 50); content.settextmatrix(70, 200); content.showtextaligned(element.align_center, "公司内部文件，请注意保密！", 300, 350, 55); content.setcolorfill(color.black); content.setfontandsize(base, 8); content.showtextaligned(element.align_center, "下载时间：" + watermarkname + "", 300, 10, 0); content.endtext(); } stamper.close(); } }

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