简述
最近有个需求需要给pdf加文字水印,于是开始搜索大法,但是发现网络上的代码基本都是将字体文件直接放在jar包里面。个人强迫症发作(手动狗头),想要像poi一样直接加载系统字体,于是研究了一下午pdfbox的源代码,发现FontFileFinder类可以实现这个功能。废话不多说,直接上代码。
引入依赖
- <dependency>
- <groupId>org.apache.pdfbox</groupId>
- <artifactId>pdfbox</artifactId>
- </dependency>
- <dependency>
- <groupId>org.projectlombok</groupId>
- <artifactId>lombok</artifactId>
- <scope>provided</scope>
- </dependency>
- <dependency>
- <groupId>jakarta.servlet</groupId>
- <artifactId>jakarta.servlet-api</artifactId>
- </dependency>
复制代码 新增水印配置类
- @Data
- @NoArgsConstructor
- public class PdfWatermarkProperties {
- public PdfWatermarkProperties(String content) {
- this.content = content;
- }
- /**
- * 文字水印内容
- */
- private String content = "";
- /**
- * ttf类型字体文件. 为null则使用默认字体
- */
- private File fontFile;
- private float fontSize = 13;
- /**
- * cmyk颜色.参数值范围为 0-255
- */
- private int[] color = {0, 0, 0, 210};
- /**
- * 透明度
- */
- private float transparency = 0.3f;
- /**
- * 倾斜度. 默认30°
- */
- private double rotate = 0.3;
- /**
- * 初始添加水印的点位
- */
- private int x = -10;
- private int y = 10;
- /**
- * 内容区域的宽高.即单个水印范围的大小
- */
- private int width = 200;
- private int height = 200;
- }
复制代码 工具类
- import org.apache.fontbox.ttf.TTFParser;
- import org.apache.fontbox.ttf.TrueTypeCollection;
- import org.apache.fontbox.ttf.TrueTypeFont;
- import org.apache.fontbox.util.autodetect.FontFileFinder;
- import org.apache.pdfbox.pdmodel.PDDocument;
- import org.apache.pdfbox.pdmodel.PDPage;
- import org.apache.pdfbox.pdmodel.PDPageContentStream;
- import org.apache.pdfbox.pdmodel.font.PDFont;
- import org.apache.pdfbox.pdmodel.font.PDType0Font;
- import org.apache.pdfbox.pdmodel.graphics.state.PDExtendedGraphicsState;
- import org.apache.pdfbox.util.Matrix;
- import javax.servlet.http.HttpServletResponse;
- import java.io.*;
- import java.net.URI;
- import java.net.URLEncoder;
- public class PdfUtil {
- private static final String DEFAULT_TTF_FILENAME = "simsun.ttf";
- private static final String DEFAULT_TTC_FILENAME = "simsun.ttc";
- private static final String DEFAULT_FONT_NAME = "SimSun";
- private static final TrueTypeFont DEFAULT_FONT;
- static {
- DEFAULT_FONT = loadSystemFont();
- }
- /**
- * 加载系统字体,提供默认字体
- *
- * @return
- */
- private synchronized static TrueTypeFont loadSystemFont() {
- //load 操作系统的默认字体. 宋体
- FontFileFinder fontFileFinder = new FontFileFinder();
- for (URI uri : fontFileFinder.find()) {
- try {
- final String filePath = uri.getPath();
- if (filePath.endsWith(DEFAULT_TTF_FILENAME)) {
- return new TTFParser(false).parse(filePath);
- } else if (filePath.endsWith(DEFAULT_TTC_FILENAME)) {
- TrueTypeCollection trueTypeCollection = new TrueTypeCollection(new FileInputStream(filePath));
- final TrueTypeFont font = trueTypeCollection.getFontByName(DEFAULT_FONT_NAME);
- //复制完之后关闭ttc
- trueTypeCollection.close();
- return font;
- }
- } catch (Exception e) {
- throw new RuntimeException("加载操作系统字体失败", e);
- }
- }
- return null;
- }
- /**
- * 添加文本水印
- * * 使用内嵌字体模式,pdf文件大小会增加1MB左右
- *
- * @param sourceFile 需要加水印的文件
- * @param descFile 目标存储路径
- * @param props 水印配置
- * @throws IOException
- */
- public static void addTextWatermark(File sourceFile, String descFile, PdfWatermarkProperties props) throws IOException {
- // 加载PDF文件
- PDDocument document = PDDocument.load(sourceFile);
- addTextToDocument(document, props);
- document.save(descFile);
- document.close();
- }
- /**
- * 添加文本水印
- *
- * @param inputStream 需要加水印的文件流
- * @param outputStream 加水印之后的流。执行完之后会关闭outputStream, 建议使用{@link BufferedOutputStream}
- * @param props 水印配置
- * @throws IOException
- */
- public static void addTextWatermark(InputStream inputStream, OutputStream outputStream, PdfWatermarkProperties props) throws IOException {
- // 加载PDF文件
- PDDocument document = PDDocument.load(inputStream);
- addTextToDocument(document, props);
- document.save(outputStream);
- }
- /**
- * 处理PDDocument,添加文本水印
- *
- * @param document
- * @param props
- * @throws IOException
- */
- public static void addTextToDocument(PDDocument document, PdfWatermarkProperties props) throws IOException {
- document.setAllSecurityToBeRemoved(true);
- // 遍历PDF文件,在每一页加上水印
- for (PDPage page : document.getPages()) {
- PDPageContentStream stream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true, true);
- // 加载水印字体
- if (DEFAULT_FONT == null) {
- throw new RuntimeException(String.format("未提供默认字体.请安装字体文件%s或%s", DEFAULT_TTF_FILENAME, DEFAULT_TTC_FILENAME));
- }
- PDFont font;
- if (props.getFontFile() != null) {
- font = PDType0Font.load(document, props.getFontFile());
- } else {
- //当TrueTypeFont为字体集合时, embedSubSet 需要设置为true, 嵌入其子集
- font = PDType0Font.load(document, DEFAULT_FONT, true);
- }
- PDExtendedGraphicsState r = new PDExtendedGraphicsState();
- // 设置透明度
- r.setNonStrokingAlphaConstant(props.getTransparency());
- r.setAlphaSourceFlag(true);
- stream.setGraphicsStateParameters(r);
- // 设置水印字体颜色
- final int[] color = props.getColor();
- stream.setNonStrokingColor(color[0], color[1], color[2], color[3]);
- stream.beginText();
- stream.setFont(font, props.getFontSize());
- // 获取PDF页面大小
- float pageHeight = page.getMediaBox().getHeight();
- float pageWidth = page.getMediaBox().getWidth();
- // 根据纸张大小添加水印,30度倾斜
- for (int h = props.getY(); h < pageHeight; h = h + props.getHeight()) {
- for (int w = props.getX(); w < pageWidth; w = w + props.getWidth()) {
- stream.setTextMatrix(Matrix.getRotateInstance(props.getRotate(), w, h));
- stream.showText(props.getContent());
- }
- }
- // 结束渲染,关闭流
- stream.endText();
- stream.restoreGraphicsState();
- stream.close();
- }
- }
- /**
- * 设置pdf文件输出的响应头
- *
- * @param response web response
- * @param fileName 文件名(不含扩展名)
- */
- public static void setPdfResponseHeader(HttpServletResponse response, String fileName) throws UnsupportedEncodingException {
- response.setContentType("application/pdf");
- response.setCharacterEncoding("utf-8");
- response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".pdf");
- }
- }
复制代码 测试
- @GetMapping("/t")
- public void getFile(HttpServletResponse response) throws IOException {
- PdfUtil.setPdfResponseHeader(response, "watermark");
- final ServletOutputStream out = response.getOutputStream();
- PdfUtil.addTextWatermark(new FileInputStream("D:/测试文件.pdf"), out, new PdfWatermarkProperties("测试pdf水印"));
- }
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