SpringBoot使用iText7实现将HTML转成PDF并添加页眉页脚水印

        <!-- itext7 -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>kernel</artifactId>
            <version>7.2.4</version>
        </dependency>
 
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>io</artifactId>
            <version>7.2.4</version>
        </dependency>
 
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>forms</artifactId>
            <version>7.2.4</version>
        </dependency>
 
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>layout</artifactId>
            <version>7.2.4</version>
        </dependency>
 
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>svg</artifactId>
            <version>7.2.4</version>
        </dependency>
 
        <!-- font-asian 用于itext使用东亚字体 -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>font-asian</artifactId>
            <version>7.2.4</version>
        </dependency>
 
        <!-- html2pdf 用于转换html为pdf -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>html2pdf</artifactId>
            <version>4.0.1</version>
        </dependency>

/**
     *
     * @param pdf_path PDF文件保存路径
     * @param pdf_name PDF文件名
     * @param cookie 用户信息
     * @param waterContent 水印内容
     * @return
     * @throws AppException
     */
    public PmsLXPDF createHtmlToPDF(String pdf_path, String pdf_name, String cookie, String waterContent) throws AppException {
        logger.info("开始createPDF");
        PmsLXPDF pdf = new PmsLXPDF();
        String pdfViewUrl = "这里是接口路径，生成jsp模板";
 
        String url = Config.getMeurl();
        logger.info("createPDF方法获取meurl[{}]",url);
 
        ItextHtmlToPdf.convert(url + pdfViewUrl, pdf_path, cookie, waterContent);
 
        File file = new File(pdf_path);
        if (file == null || !file.exists()) {
            throw new AppException("立项报告生成pdf失败！");
        }
        try {
            //可以做一些保存的操作
        } catch (Exception e) {
            logger.error("Exception happened", e);
        }
        //pdf.setSuccess(StringUtils.isNotBlank(id));
        logger.info("createPDF结束");
 
        return pdf;
    }
 
 
 
 
/**
     * html转pdf
     *
     * @param srcPath html路径，可以是硬盘上的路径，也可以是网络路径
     * @param destPath pdf保存路径
     * @return 转换成功返回true
     */
    public static boolean convert(String srcPath, String destPath, String cookie, String waterContent) {
        if (!FileUtils.createFile(destPath)) {
            LOGGER.error("目标路径PDF文件已存在，生成PDF失败：" + destPath);
            return false;
        }
        LOGGER.info("convert方法传入的srcPath[{}],cookie[{}]",srcPath,cookie);
        InputStream in = null;
        OutputStream out = null;
        HttpURLConnection connection = null;
        try {
            if (srcPath.startsWith("http")) {
                LOGGER.info("convert方法传入的srcPath[{}],进入了需要cookie的分支",srcPath);
                URL url = new URL(srcPath);
                int connectTimeout = Integer.parseInt(ConfigUtil.getConfig("xxx", "30000"));
                int readTimeout = Integer.parseInt(ConfigUtil.getConfig("xxx", "30000"));
                connection = (HttpURLConnection) url.openConnection();
                // 设置连接主机服务器的超时时间
                connection.setConnectTimeout(connectTimeout);
                // 设置读取远程返回的数据时间
                connection.setReadTimeout(readTimeout);
                if (StringUtils.isNotBlank(cookie)) {
                    // 设置Cookie
                    String cookies = "SESSION=".concat(cookie);
                    connection.setRequestProperty("Cookie", cookies);
                }
                // 连接和获取响应
                connection.connect();
                in = connection.getInputStream();
            } else {
                LOGGER.info("convert方法传入的srcPath[{}],进入了不需要登录的分支",srcPath);
                in = new FileInputStream(srcPath);
            }
            out = new ByteArrayOutputStream();
            HtmlPrittifier.fixHtml(in, out);
        } catch (Throwable t) {
            LOGGER.error("读取该文件失败：" + srcPath, t);
            return false;
        } finally {
            IOUtils.closeQuietly(in);
            IOUtils.closeQuietly(out);
            if (connection != null) {
                connection.disconnect();// 关闭远程连接
            }
        }
        
        String html = out.toString();
 
        converCreatPdf(destPath, cookie, html, waterContent);
        
        return true;
    }
 
 
 
private static boolean converCreatPdf(String destPath, String cookie, String html, String waterContent) {
        try (OutputStream fos = new FileOutputStream(destPath)) {
            //将html转换成pdf
            PdfWriter pdfWriter = new PdfWriter(fos);
            PdfDocument pdfDoc = new PdfDocument(pdfWriter);
 
            // 统一设置页眉
            String header = "我是页眉";
            Header headerHandler = new Header(header);
            pdfDoc.addEventHandler(PdfDocumentEvent.START_PAGE, headerHandler);
 
            // 统一设置页脚
            Footer footerHandler = new Footer();
            pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, footerHandler);
 
            if (StringUtils.isNotBlank(waterContent)) {
                // 添加水印
                PdfWaterMarker pdfWaterMarker = new PdfWaterMarker(waterContent);
                pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, pdfWaterMarker);
            }
 
            // 需要先生成document，而不是直接生成pdf文件（因直接生成pdf文件会关闭流）
            ConverterProperties converterProperties = getConverterProperties(cookie);
            Document document = HtmlConverter.convertToDocument(html, pdfDoc, converterProperties);
 
            // flush触发写操作，此时才会触发已经注册的事件处理器
            document.flush();
 
            // 待document对象写完后，才能开始写入总页码
            LOGGER.debug("PDF总页数：" + document.getPdfDocument().getNumberOfPages());
            footerHandler.writeTotal(pdfDoc);
            document.close();
        } catch (Throwable t) {
            LOGGER.error("生成PDF失败：" + destPath, t);
            return false;
        }
        return true;
    }
 
 
public static ConverterProperties getConverterProperties(String cookie) {
        ConverterProperties converterProperties = new ConverterProperties();
        FontProvider fontProvider = getFontProvider();
        converterProperties.setFontProvider(fontProvider);
        CookieResourceRetriever myResourceRetriever = new CookieResourceRetriever(cookie);
        converterProperties.setResourceRetriever(myResourceRetriever);
        return converterProperties;
    }
 
 
public void writeTotal(PdfDocument pdf) {
            Canvas canvas = new Canvas(placeholder, pdf);
            canvas.setFontSize(8);
            if (font != null) {
                // 设置支持中文
                canvas.setFont(this.font);
                // 在占位符写入总页数
                canvas.showTextAligned(String.format("/共[%d]页", pdf.getNumberOfPages()), 0, descent,
                    TextAlignment.LEFT);
            }
            canvas.close();
        }

public class HtmlPrittifier {
 
    /**
     * 将HTML标准化，补全缺失的闭标签
     *
     * @param in
     * @param out
     */
    public static void fixHtml(InputStream in, OutputStream out) {
        // obtain a new Tidy instance
        Tidy tidy = new Tidy();
 
        // set desired config options using tidy setters
        tidy.setXHTML(true);
 
        tidy.setInputEncoding("utf8");
 
        tidy.setShowWarnings(true);
 
        tidy.setWraplen(1024);
 
        tidy.setSmartIndent(true);
 
        tidy.setQuiet(true);
 
        tidy.setPrintBodyOnly(false);
 
        tidy.setOutputEncoding("utf8");
 
        tidy.setTidyMark(false);
 
        // output document even if errors were found. 防止有些自定义tag匹配不上导致pdf不输出
        tidy.setForceOutput(true);
 
        // 不转换uri，防止uri中有中文，会将非ascii码转为十六进制，导致找不到中文图片链接。
        tidy.setFixUri(false);
 
        tidy.parse(in, out);
    }
 
    /**
     * 将HTML标准化，补全缺失的闭标签
     * 
     * @param htmlString
     */
    @SneakyThrows
    public static String fixHtml(String htmlString) {
        ByteArrayInputStream in = new ByteArrayInputStream(htmlString.getBytes("UTF-8"));
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        fixHtml(in, out);
        return out.toString();
    }
 
}

private static PdfFont createDefaultFont() throws IOException {
        return PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H");
}
 
protected static class PdfWaterMarker implements IEventHandler {
 
        private PdfFont font;
        private String waterContent;
 
        public PdfWaterMarker(String waterContent) {
            this.waterContent = waterContent;
            try {
                this.font = createDefaultFont();
            } catch (IOException e) {
                LOGGER.error("PDF Header设置中文字体失败", e);
            }
        }
 
        @Override
        public void handleEvent(Event event) {
            PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
            PdfDocument pdfDoc = docEvent.getDocument();
            PdfPage page = docEvent.getPage();
            Rectangle pageSize = page.getPageSize();
 
            PdfCanvas pdfCanvas = new PdfCanvas(page.getLastContentStream(), page.getResources(), pdfDoc);
            Canvas canvas = new Canvas(pdfCanvas, pageSize);
 
            // 设置水印文字内容
            Paragraph waterMarker = new Paragraph(waterContent)
                    .setFont(font)
                    .setOpacity(0.15f)// 设置透明度
                    .setFontSize(16);// 文字大小
 
            /*for (int i = 0; i < 6; i++) {
                for (int j = 0; j < 6; j++) {
                    canvas.showTextAligned(waterMarker, (150 + i * 300), (160 + j * 150), pdfDoc.getNumberOfPages(),
                            TextAlignment.CENTER, VerticalAlignment.MIDDLE, 0.3f);
                }
            }*/
 
            // 计算水印的起始位置和间隔
            float xStart = 1;
            float yStart = 1;
            float stepX = 150;
            float stepY = 150;
 
            // 在页面上循环绘制水印文字
            for (float x = xStart; x < pageSize.getWidth(); x += stepX) {
                for (float y = yStart; y < pageSize.getHeight(); y += stepY) {
                    // 绘制水印文字
                    canvas.showTextAligned(waterMarker, x, y, pdfDoc.getNumberOfPages(),
                            TextAlignment.LEFT, VerticalAlignment.MIDDLE, 0.6f);
                }
            }
            // 关闭流
            canvas.close();
        }
    }

private static PdfFont createDefaultFont() throws IOException {
        return PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H");
}
 
protected static class Header implements IEventHandler {
 
        private String header;
 
        private PdfFont font;
 
        public Header(String header) {
            this.header = header;
            try {
                this.font = createDefaultFont();
            } catch (IOException e) {
                LOGGER.error("PDF Header设置中文字体失败", e);
            }
        }
 
        @Override
        public void handleEvent(Event event) {
            PdfDocumentEvent docEvent = (PdfDocumentEvent)event;
            PdfDocument pdf = docEvent.getDocument();
 
            PdfPage page = docEvent.getPage();
            Rectangle pageSize = page.getPageSize();
 
            Document doc = new Document(pdf);
            float leftMargin = doc.getLeftMargin();
            float rightMargin = doc.getRightMargin();
            float bottomMargin = doc.getBottomMargin();
            float topMargin = doc.getTopMargin();
            float height = pageSize.getHeight();
            float width = pageSize.getWidth();
 
            Canvas canvas = new Canvas(new PdfCanvas(page), pageSize);
            if (font != null) {
                // 设置支持中文
                canvas.setFont(this.font);
            }
            canvas.setFontSize(8);
 
            // Creates drawing canvas
            PdfCanvas pdfCanvas = new PdfCanvas(page);
            pdfCanvas.setLineWidth(0.1f);
            pdfCanvas.moveTo(leftMargin, height - topMargin + 3).lineTo(width - rightMargin, height - topMargin + 3)
                .stroke();
 
            // Write text at position
            canvas.showTextAligned(header, width / 2, height - 30, TextAlignment.CENTER);
            canvas.close();
        }
    }

protected static class Footer implements IEventHandler {
 
        // 写总页码的占位符
        protected PdfFormXObject placeholder;
 
        // 页脚占位符大小
        private float side = 36;
 
        // 页脚占位符位置向右调整移动1，向下调整移动3
        private float space = 1;
        private float descent = 3;
 
        private PdfFont font;
 
        public Footer() {
            this.placeholder = new PdfFormXObject(new Rectangle(0, 0, side, side));
            try {
                this.font = createDefaultFont();
            } catch (IOException e) {
                LOGGER.error("PDF Footer设置中文字体失败", e);
            }
        }
 
        @Override
        public void handleEvent(Event event) {
            PdfDocumentEvent docEvent = (PdfDocumentEvent)event;
            PdfDocument pdf = docEvent.getDocument();
            PdfPage page = docEvent.getPage();
            int pageNumber = pdf.getPageNumber(page);
            Rectangle pageSize = page.getPageSize();
 
            LOGGER.debug(String.format("当前处理第[%d]页", pageNumber));
 
            Document doc = new Document(pdf);
            float leftMargin = doc.getLeftMargin();
            float rightMargin = doc.getRightMargin();
            float bottomMargin = doc.getBottomMargin();
            float height = page.getPageSize().getHeight();
            float width = page.getPageSize().getWidth();
 
            // 页脚的位置
            float x = width / 2;
            float y = bottomMargin / 2;
 
            // Creates drawing canvas
            PdfCanvas pdfCanvas = new PdfCanvas(page);
            Canvas canvas = new Canvas(pdfCanvas, pageSize);
 
            if (font != null) {
                // 设置支持中文
                canvas.setFont(this.font);
            }
            canvas.setFontSize(8);
 
            // 设置支持横线
            // canvas.setStrokeWidth(0.1f);
            pdfCanvas.setLineWidth(0.1f);
            pdfCanvas.moveTo(leftMargin, bottomMargin - 3).lineTo(width - rightMargin, bottomMargin - 3).stroke();
 
            // 设置支持页码
            Paragraph p = new Paragraph().add(String.format("第[%d]页", pageNumber));
            canvas.showTextAligned(p, x, y, TextAlignment.RIGHT);
            canvas.close();
 
            // 添加占位符，用于写入总页码
            pdfCanvas.addXObjectAt(placeholder, x + space, y - descent);
            pdfCanvas.release();
 
        }

<style>
    #watermark div {
        /* color: rgba(255, 0, 0, .1); */
        color: rgba(0, 0, 255, .1);
        position: absolute;
        font-size: 24px;
        white-space: nowrap;
        transform: rotate(-30deg);
        -ms-transform: rotate(-30deg); /* IE 9 */
        -moz-transform: rotate(-30deg); /* Firefox */
        -webkit-transform: rotate(-30deg); /* Safari 和 Chrome */
        -o-transform: rotate(-30deg); /* Opera */
    }
</style>
<div id="watermark"
     style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: transparent; pointer-events: none; z-index: 99999999;">
</div>
<script>
    var operatorName = '${requestScope.xx.xxx}';
    var erpId = '${requestScope.xx.xxx}';
    (function() {
        var w = screen.width;
        var h = screen.height;
        var r = Math.sqrt(w * w + h * h);
        var i = 0;
        var j = 0;
        var watermark = document.querySelector('#watermark');
        var div;
        var top, left;
        for (var i = 0; i < 10; ++i) {
            for (var j = 0; j < 10; ++j) {
                div = document.createElement('div');
                div.innerText = '禁止外传：' + operatorName + '（' + erpId + '）';
                top = i * 100 + 'px';
                left = 500 * j - 50 - (i % 2 == 0 ? 250 : 0) + 'px';
                div.style.setProperty('top', top);
                div.style.setProperty('left', left);
                watermark.appendChild(div);
            }
        }
    })();
</script>