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Flying HTML生成PDF添加水印

news 2025/8/10 22:37:56

HTML转PDF并添加水印

<!-- 用于生成PDF -->
<dependency><groupId>org.xhtmlrenderer</groupId><artifactId>flying-saucer-pdf</artifactId><version>9.1.20</version>
</dependency>import java.io.File;
import java.io.FileOutputStream;
import java.util.Random;
import org.xhtmlrenderer.pdf.ITextRenderer;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.Image;
import com.lowagie.text.Phrase;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.ColumnText;
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 HtmlToPdfConverter {public static void main(String[] args) throws Exception {String htmlContent = "<html><head><style>body { font-family: 'SimHei', sans-serif; }</style></head><body><h1>我的标题</h1><p>测试pdf</p></body></html>";// 使用Flying Saucer渲染HTML到临时PDF文件File tempFile = File.createTempFile("temp", ".pdf");ITextRenderer renderer = new ITextRenderer();//设置字体File fontFile = new File("F:\\weixin\\emlsr\\src\\main\\resources\\font\\simhei.ttf");BaseFont baseFont = BaseFont.createFont(fontFile.getAbsolutePath(), BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);renderer.getFontResolver().addFont(fontFile.getAbsolutePath(), baseFont.getEncoding(), BaseFont.NOT_EMBEDDED);//生成数据renderer.setDocumentFromString(htmlContent);renderer.layout();renderer.createPDF(new FileOutputStream(tempFile));// 用iText打开临时PDF文件，并添加水印PdfGState gs = new PdfGState();gs.setFillOpacity(0.5f); // 设置为 50% 的透明度Font font = new Font(baseFont, 30, Font.NORMAL);PdfReader reader = new PdfReader(tempFile.getAbsolutePath());PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("c:\\output.pdf"));//水印图片(001)//Image watermarkImage = Image.getInstance("C:\\1.jpg");//float scale = 0.2f; // 水印图片缩放比例//watermarkImage.scaleAbsolute(watermarkImage.getWidth() * scale, watermarkImage.getHeight() * scale);//水印平铺(002)// 获取一个页面尺寸作为参考来计算水印图片的缩放比例//Image watermarkImage = Image.getInstance("C:\\1.jpg");// 设置水印图片平铺的宽度和高度（例如：将水印图片设为100x100像素）//float tileWidth = 100f;//float tileHeight = 100f;//watermarkImage.scaleAbsolute(tileWidth, tileHeight);//水印随机平铺3个(003)Image watermarkImage = Image.getInstance("C:\\1.jpg");// 设置水印图片平铺的宽度和高度（例如：将水印图片设为100x100像素）float tileWidth = 100f;float tileHeight = 100f;Random random = new Random(); // 创建一个随机数生成器int n = reader.getNumberOfPages();for (int i = 1; i <= n; i++) {PdfContentByte underContent = stamper.getUnderContent(i);underContent.setGState(gs);// 字体添加透明度ColumnText.showTextAligned(underContent, Element.ALIGN_CENTER,new Phrase("水印文字",font),reader.getPageSize(i).getWidth() / 2,reader.getPageSize(i).getHeight() / 2,45); // 角度可调整水印倾斜程度// 获取页面尺寸并计算水印位置(001)//Rectangle pageRect = reader.getPageSizeWithRotation(i);//float x = (pageRect.getWidth() - watermarkImage.getScaledWidth()) / 2;//float y = (pageRect.getHeight() - watermarkImage.getScaledHeight()) / 2;// 添加水印图片//underContent.addImage(watermarkImage, watermarkImage.getWidth(), 0, 0, watermarkImage.getHeight(), x, y);//水印平铺(002)满屏//Rectangle pageRect = reader.getPageSizeWithRotation(i);// 计算并添加水印图片的位置（按照平铺效果）//for (float x = 0; x < pageRect.getWidth(); x += tileWidth) {//    for (float y = 0; y < pageRect.getHeight(); y += tileHeight) {//        underContent.addImage(watermarkImage, tileWidth, 0, 0, tileHeight, x, y);//    }//}//(003)Rectangle pageRect = reader.getPageSizeWithRotation(i);// 计算并添加三个随机位置的水印图片for (int j = 0; j < 3; j++) {// 随机计算X和Y坐标float x = random.nextFloat() * (pageRect.getWidth() - tileWidth);float y = random.nextFloat() * (pageRect.getHeight() - tileHeight);underContent.addImage(watermarkImage, tileWidth, 0, 0, tileHeight, x, y);}}// 关闭stamper.close();reader.close();tempFile.delete();System.out.println("带有水印的PDF文件已生成至： output.pdf");}
}