Java itextpdf7工具包 HTML转PDF（支持中文）

1.依赖

<!-- itext7html转pdf  -->
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>html2pdf</artifactId>
    <version>3.0.2</version>
</dependency>
<!-- 中文字体支持 -->
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>font-asian</artifactId>
    <version>7.1.13</version>
</dependency>

注意两个依赖的版本对应，进入html2pdf的pom文件就能看到itext的版本，font-asian的版本最低也要是html2pdf中itext7的版本。

2.水印和页码

导出pdf一般是需要水印和页码
实现com.itextpdf.kernel.events.IEventHandler接口就可以了水印

public class WaterMarkEventHandler implements IEventHandler {
 
    /**
     * 水印内容
     */
    private String waterMarkContent;
 
    /**
     * 一页中有几列水印
     */
    private int waterMarkX;
 
    /**
     * 一页中每列有多少水印
     */
    private int waterMarkY;
 
    public WaterMarkEventHandler(String waterMarkContent) {
        this(waterMarkContent, 5, 5);
    }
 
    public WaterMarkEventHandler(String waterMarkContent, int waterMarkX, int waterMarkY) {
        this.waterMarkContent = waterMarkContent;
        this.waterMarkX = waterMarkX;
        this.waterMarkY = waterMarkY;
    }
 
    @Override
    public void handleEvent(Event event) {
 
        PdfDocumentEvent documentEvent = (PdfDocumentEvent) event;
        PdfDocument document = documentEvent.getDocument();
        PdfPage page = documentEvent.getPage();
        Rectangle pageSize = page.getPageSize();
 
        PdfFont pdfFont = null;
        try {
            pdfFont = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamAfter(), page.getResources(), document);
 
        Paragraph waterMark = new Paragraph(waterMarkContent).setOpacity(0.5f);
        Canvas canvas = new Canvas(pdfCanvas, pageSize)
                .setFontColor(WebColors.getRGBColor("lightgray"))
                .setFontSize(16)
                .setFont(pdfFont);
 
        for (int i = 0; i < waterMarkX; i++) {
            for (int j = 0; j < waterMarkY; j++) {
                canvas.showTextAligned(waterMark, (150 + i * 300), (160 + j * 150), document.getNumberOfPages(), TextAlignment.CENTER, VerticalAlignment.BOTTOM, 120);
            }
        }
        canvas.close();
    }
}

页码

public class PageEventHandler implements IEventHandler {
 
    @Override
    public void handleEvent(Event event) {
        PdfDocumentEvent documentEvent = (PdfDocumentEvent) event;
        PdfDocument document = documentEvent.getDocument();
        PdfPage page = documentEvent.getPage();
        Rectangle pageSize = page.getPageSize();
 
        PdfFont pdfFont = null;
        try {
            pdfFont = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        PdfCanvas pdfCanvas = new PdfCanvas(page.getLastContentStream(), page.getResources(), document);
        Canvas canvas = new Canvas(pdfCanvas, pageSize);
        float  x = (pageSize.getLeft() + pageSize.getRight()) / 2;
        float  y = pageSize.getBottom() + 15;
        Paragraph paragraph = new Paragraph("第" + document.getPageNumber(page) + "页/共" + document.getNumberOfPages() + "页")
                .setFontSize(10)
                .setFont(pdfFont);
        canvas.showTextAligned(paragraph, x, y, TextAlignment.CENTER);
        canvas.close();
    }
}

3.工具类

import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
import com.itextpdf.kernel.events.PdfDocumentEvent;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.font.FontProvider;
 
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
 
public class HtmlToPdfUtils {
 
    /**
     * html转pdf
     *
     * @param  inputStream 输入流
     * @param  waterMark 水印
     * @param fontPath 字体路径，ttc后缀的字体需要添加<b>,0<b/>；比如："C:\\Windows\\Fonts\\微软雅黑\\msyh.ttc,0"
     * @param  outputStream 输出流
     */
    public static void convertToPdf(InputStream inputStream, String waterMark, String fontPath, OutputStream outputStream) throws IOException {
 
        PdfWriter pdfWriter = new PdfWriter(outputStream);
        PdfDocument pdfDocument = new PdfDocument(pdfWriter);
        //设置为A4大小
        pdfDocument.setDefaultPageSize(PageSize.A4);
        //添加水印
        pdfDocument.addEventHandler(PdfDocumentEvent.END_PAGE, new WaterMarkEventHandler(waterMark));
 
        //添加中文字体支持
        ConverterProperties properties = new ConverterProperties();
        FontProvider fontProvider = new FontProvider();
 
        PdfFont sysFont = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
        fontProvider.addFont(sysFont.getFontProgram(), "UniGB-UCS2-H");
 
        //添加自定义字体，例如微软雅黑
        if (StrUtil.isNotBlank(fontPath)){
            PdfFont microsoft = PdfFontFactory.createFont(fontPath, PdfEncodings.IDENTITY_H, false);
            fontProvider.addFont(microsoft.getFontProgram(), PdfEncodings.IDENTITY_H);
        }
 
        properties.setFontProvider(fontProvider);
        HtmlConverter.convertToPdf(inputStream, pdfDocument, properties);
 
        pdfWriter.close();
        pdfDocument.close();
    }
 
}