PDF文档设置水印工具类

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;

import org.apache.log4j.Logger;

import com.itextpdf.text.Element;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfGState;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;

public class WatermarkUtil {

    private static Logger logger = Logger.getLogger(WatermarkUtil.class);

    /**
     * PDF文件设置文字水印
     * 
     * @param inputFilePath  输入文件路径
     * @param outputFilePath 输出文件路径
     * @param StrWatermark   文字水印内容
     * @param pageList       水印添加的页码（传空则全部页码添加水印）
     * @return 返回是否添加成功
     */
    public static Boolean setStrWatermark2PDFByPage(String inputFilePath, String outputFilePath, String StrWatermark,
            ArrayList<String> pageList) {
        try {
            logger.info("开始添加文字水印，inputFilePath：" + inputFilePath + "; outputFilePath：" + outputFilePath
                    + "; StrWatermark：" + StrWatermark + "; ");
            PdfReader reader = new PdfReader(inputFilePath);
            File outputFile = new File(outputFilePath);
            // 假如目标路径不存在,则新建该路径
            if (!outputFile.getParentFile().exists()) {
                outputFile.getParentFile().mkdirs();
            }
            // 假如目标文件不存在,则新建该文件
            if (!outputFile.exists()) {
                outputFile.createNewFile();
            }
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(outputFile));
            PdfStamper stamper = new PdfStamper(reader, bos);
            int total = reader.getNumberOfPages() + 1;
            PdfContentByte content;
            BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
            // BaseFont base =
            // BaseFont.createFont("/data/tmis/uploads/file/font/simsun.ttc,1",
            // BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
            PdfGState gs = new PdfGState();
            if (pageList == null || pageList.isEmpty()) {// 水印添加的页码（传空则全部页码添加水印）
                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.setRGBColorFill(222, 222, 222);
                    content.setFontAndSize(base, 30);
                    content.setTextMatrix(100, 250);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 100, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 300, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 500, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 700, 45);

                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 100, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 300, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 500, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 700, 45);

                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 100, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 300, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 500, 45);
                    content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 700, 45);

                    content.setRGBColorFill(0, 0, 0);
                    content.setFontAndSize(base, 8);
                    content.endText();

                }
                stamper.close();
                reader.close();
            } else {
                for (int i = 1; i < total; i++) {
                    if (pageList.contains(String.valueOf(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.setRGBColorFill(222, 222, 222);
                        content.setFontAndSize(base, 30);
                        content.setTextMatrix(100, 250);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 100, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 300, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 500, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 100, 700, 45);

                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 100, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 300, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 500, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 300, 700, 45);

                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 100, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 300, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 500, 45);
                        content.showTextAligned(Element.ALIGN_CENTER, StrWatermark, 500, 700, 45);

                        content.setRGBColorFill(0, 0, 0);
                        content.setFontAndSize(base, 8);
                        content.endText();
                    }
                }
                stamper.close();
                reader.close();
                logger.info("添加文字水印完毕");
            }
            return true;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            logger.error("添加文字水印异常" + e.toString());
            return false;
        }
    }

    /**
     * PDF文件设置图片水印
     * 
     * @param inputFilePath    输入文件路径
     * @param outputFilePath   输出文件路径
     * @param ImgWatermarkPath 图片水印路径
     * @param pageList         水印添加的页码（传空则全部页码添加水印）
     * @return 返回是否添加成功
     */
    public static Boolean setImgWatermark2PDFByPage(String inputFilePath, String outputFilePath,
            String ImgWatermarkPath, ArrayList<String> pageList) {
        try {
            logger.info("开始添加图片水印，inputFilePath：" + inputFilePath + "; outputFilePath：" + outputFilePath
                    + "; ImgWatermarkPath：" + ImgWatermarkPath + "; ");
            // 待加水印的文件
            PdfReader reader = new PdfReader(inputFilePath);
            // 加完水印的文件
            File outputFile = new File(outputFilePath);
            // 假如目标路径不存在,则新建该路径
            if (!outputFile.getParentFile().exists()) {
                outputFile.getParentFile().mkdirs();
            }
            // 假如目标文件不存在,则新建该文件
            if (!outputFile.exists()) {
                outputFile.createNewFile();
            }
            PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputFile));
            // 设置字体
            BaseFont font = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
            // PDF总页数
            int total = reader.getNumberOfPages() + 1;
            // 循环对每页插入水印
            PdfContentByte content;

            if (pageList == null || pageList.isEmpty()) {// 水印添加的页码（传空则全部页码添加水印）
                for (int i = 1; i < total; i++) {
                    PdfGState gs1 = new PdfGState();
                    gs1.setFillOpacity(0.1f);
                    content = stamper.getUnderContent(i);// 在内容下方加水印
                    content.setGState(gs1);
                    // 图片水印
                    if (ImgWatermarkPath != null) {
                        Image image = null;
                        if (ImgWatermarkPath != null) {
                            image = Image.getInstance(ImgWatermarkPath);
                            image.setRotationDegrees(45);//旋转 角度
                            // 设置图片的显示大小
                            image.scaleToFit(100, 125);
                        }
                        image.setAbsolutePosition(50, 50);content.addImage(image);
                        image.setAbsolutePosition(50, 250);content.addImage(image);
                        image.setAbsolutePosition(50, 450);content.addImage(image);
                        image.setAbsolutePosition(50, 650);content.addImage(image);
                        
                        image.setAbsolutePosition(250, 50);content.addImage(image);
                        image.setAbsolutePosition(250, 250);content.addImage(image);
                        image.setAbsolutePosition(250, 450);content.addImage(image);
                        image.setAbsolutePosition(250, 650);content.addImage(image);
                        
                        image.setAbsolutePosition(450, 50);content.addImage(image);
                        image.setAbsolutePosition(450, 250);content.addImage(image);
                        image.setAbsolutePosition(450, 450);content.addImage(image);
                        image.setAbsolutePosition(450, 650);content.addImage(image);
                        
                    }
                }
            } else {
                for (int i = 1; i < total; i++) {
                    if (pageList.contains(String.valueOf(i))) {
                        PdfGState gs1 = new PdfGState();
                        gs1.setFillOpacity(0.1f);
                        content = stamper.getUnderContent(i);// 在内容下方加水印
                        content.setGState(gs1);
                        // 图片水印
                        if (ImgWatermarkPath != null) {
                            Image image = null;
                            if (ImgWatermarkPath != null) {
                                image = Image.getInstance(ImgWatermarkPath);
                                image.setRotationDegrees(45);//旋转 角度
                                // 设置图片的显示大小
                                image.scaleToFit(100, 125);
                            }
                            image.setAbsolutePosition(50, 50);content.addImage(image);
                            image.setAbsolutePosition(50, 250);content.addImage(image);
                            image.setAbsolutePosition(50, 450);content.addImage(image);
                            image.setAbsolutePosition(50, 650);content.addImage(image);
                            
                            image.setAbsolutePosition(250, 50);content.addImage(image);
                            image.setAbsolutePosition(250, 250);content.addImage(image);
                            image.setAbsolutePosition(250, 450);content.addImage(image);
                            image.setAbsolutePosition(250, 650);content.addImage(image);
                            
                            image.setAbsolutePosition(450, 50);content.addImage(image);
                            image.setAbsolutePosition(450, 250);content.addImage(image);
                            image.setAbsolutePosition(450, 450);content.addImage(image);
                            image.setAbsolutePosition(450, 650);content.addImage(image);
                        }
                    }
                }
            }
            stamper.close();
            reader.close();
            logger.info("添加图片水印完毕");
            return true;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            logger.error("添加图片水印异常" + e.toString());
            return false;
        }

    }

}
本文链接：https://www.cnblogs.com/RivenLw/p/10309281.html
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