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");
}
}