html转pdf（总结五种方法Java）

html转pdf（总结五种方法Java）

Java 实现html转pdf，总结五种方法。
推荐使用wkhtmltopdf,Itext

方法一：使用wkhtmltopdf

1、下载插件wkhtmltopdf
https://wkhtmltopdf.org/downloads.html

2、本机测试
本目录下cmd进入
输入命令 wkhtmltopdf.exe ‪E:\学习文档\百度常用标签.html ‪E:\学习文档\百度常用标签.pdf

3、java代码实现
HtmlToPdf类

import java.io.File;
 
public class HtmlToPdf {
 
    //    wkhtmltopdf在系统中的路径
    private static final String toPdfTool = "‪D:\\wkhtmltopdf\\bin\\wkhtmltopdf.exe";
 
    /**
     * 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 toPdfTool){
        File file = new File(destPath);
        File parent = file.getParentFile();
        //如果pdf保存路径不存在，则创建路径
        if(!parent.exists()){
            parent.mkdirs();
        }
        StringBuilder cmd = new StringBuilder();
        cmd.append(toPdfTool);
        cmd.append(" ");
        cmd.append(" --header-line");//页眉下面的线
        cmd.append(" --margin-top 3cm ");//设置页面上边距 (default 10mm)
        // cmd.append(" --header-html file:///"+WebUtil.getServletContext().getRealPath("")+FileUtil.convertSystemFilePath("\\style\\pdf\\head.html"));// (添加一个HTML页眉,后面是网址)
        cmd.append(" --header-spacing 5 ");// (设置页眉和内容的距离,默认0)
        //cmd.append(" --footer-center (设置在中心位置的页脚内容)");//设置在中心位置的页脚内容
        //cmd.append(" --footer-html file:///"+WebUtil.getServletContext().getRealPath("")+FileUtil.convertSystemFilePath("\\style\\pdf\\foter.html"));// (添加一个HTML页脚,后面是网址)
        cmd.append(" --footer-line");//* 显示一条线在页脚内容上)
        cmd.append(" --footer-spacing 5 ");// (设置页脚和内容的距离)
        cmd.append(srcPath);
        cmd.append(" ");
        cmd.append(destPath);
        boolean result = true;
        try{
            Process proc = Runtime.getRuntime().exec(cmd.toString());
            HtmlToPdfInterceptor error = new HtmlToPdfInterceptor(proc.getErrorStream());
            HtmlToPdfInterceptor output = new HtmlToPdfInterceptor(proc.getInputStream());
            error.start();
            output.start();
            proc.waitFor();
        }catch(Exception e){
            result = false;
            e.printStackTrace();
        }
 
        return result;
    }
    public static void main(String[] args) {
        String sourcePath = "https://blog.csdn.net/weixin_43981813/article/details/127895442?spm=1001.2014.3001.5502";
        HtmlToPdf.convert(sourcePath, "D:\\testpdf.pdf",toPdfTool);
        System.out.println("0000");
    }
 
 
}

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HtmlToPdfInterceptor类

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
 
public class HtmlToPdfInterceptor extends Thread {
    private InputStream is;
 
    public HtmlToPdfInterceptor(InputStream is){
        this.is = is;
    }
 
    public void run(){
        try{
            InputStreamReader isr = new InputStreamReader(is, "utf-8");
            BufferedReader br = new BufferedReader(isr);
            String line = null;
            while ((line = br.readLine()) != null) {
                System.out.println(line.toString()); //输出内容
            }
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}

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linux版本参考： https://blog.csdn.net/weixin_43981813/article/details/128257492

方法二：使用Itext

1、引入依赖

    com.itextpdf
    html2pdf
    3.0.2



    com.itextpdf
    font-asian
    7.1.13

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2、解决水印和页码
只需实现实现com.itextpdf.kernel.events.IEventHandler接口即可

/**
 * 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();
    }
}
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/**
 * 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();
    }
}
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3、转换工具类

/**
 * Itext7转换工具类
 */
@Slf4j
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,0
     * @param outputStream 输出流
     * @date : 2022/11/15 14:07
     */
    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();

        //        设置字体
        /*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 (StringUtils.isNotBlank(fontPath)) {
            PdfFont microsoft = PdfFontFactory.createFont(fontPath, PdfEncodings.IDENTITY_H, false);
            fontProvider.addFont(microsoft.getFontProgram(), PdfEncodings.IDENTITY_H);
        }

        properties.setFontProvider(fontProvider);
        //        读取Html文件流，查找出当中的 或出现类似的符号空格字符
        inputStream = readInputStrem(inputStream);
        if (inputStream != null) {
            //        生成pdf文档
            HtmlConverter.convertToPdf(inputStream, pdfDocument, properties);
            pdfWriter.close();
            pdfDocument.close();
            return;
        } else {
            log.error("转换失败！");
        }
    }

    /**
     * 读取HTML 流文件，并查询当中的 或类似符号直接替换为空格
     *
     * @param inputStream
     * @return
     */
    private static InputStream readInputStrem(InputStream inputStream) {
        // 定义一些特殊字符的正则表达式 如：
        String regEx_special = "\\&[a-zA-Z]{1,10};";
        try {
            //<1>创建字节数组输出流，用来输出读取到的内容
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            //<2>创建缓存大小
            byte[] buffer = new byte[1024]; // 1KB
            //每次读取到内容的长度
            int len = -1;
            //<3>开始读取输入流中的内容
            while ((len = inputStream.read(buffer)) != -1) { //当等于-1说明没有数据可以读取了
                baos.write(buffer, 0, len);   //把读取到的内容写到输出流中
            }
            //<4> 把字节数组转换为字符串
            String content = baos.toString();
            //<5>关闭输入流和输出流
            //            inputStream.close();
            baos.close();
            //            log.info("读取的内容：{}", content);
            //            判断HTML内容是否具有HTML的特殊字符标记
            Pattern compile = Pattern.compile(regEx_special, Pattern.CASE_INSENSITIVE);
            Matcher matcher = compile.matcher(content);
            String replaceAll = matcher.replaceAll("");
            //            log.info("替换后的内容：{}", replaceAll);
            //            将字符串转化为输入流返回
            InputStream stringStream = getStringStream(replaceAll);
            //<6>返回结果
            return stringStream;
        } catch (Exception e) {
            e.printStackTrace();
            log.error("错误信息：{}", e.getMessage());
            return null;
        }
    }

    /**
     * 将一个字符串转化为输入流
     * @param sInputString 字符串
     * @return
     */
    public static InputStream getStringStream(String sInputString) {
        if (sInputString != null && !sInputString.trim().equals("")) {
            try {
                ByteArrayInputStream tInputStringStream = new ByteArrayInputStream(sInputString.getBytes());
                return tInputStringStream;
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }

}
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@Slf4j
public class Test {

    public static void main(String[] args) throws IOException {
        long startTime = System.currentTimeMillis();
        //       html文件所在相对路径
        String htmlFile = "src/main/resources/html/index2.html";
        //       pdf文件存储相对路径
        String pdfFile = "src/main/resources/x6.pdf";
        //        自定义水印
        String waterMarkText =  "";
        InputStream inputStream = new FileInputStream(htmlFile);
        OutputStream outputStream = new FileOutputStream(pdfFile);
        //微软雅黑在windows系统里的位置如下，linux系统直接拷贝该文件放在linux目录下即可
        //        String fontPath = "src/main/resources/font/STHeiti Light.ttc,0";
        String fontPath = "src/main/resources/font/simsun.ttc,0";
        HtmlToPdfUtils.convertToPdf(inputStream, waterMarkText, fontPath, outputStream);
        log.info("转换结束，耗时：{}ms",System.currentTimeMillis()-startTime);
    }
}
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将文档从一种格式转换为另一种格式是Spire.Doc的主要功能之一。这种转换只不过是加载和保存操作的组合。因此，使用Spire.DOC可以将文档从任何受支持的加载格式转换为任何受支持的保存格式。
spire.doc分为商业版和免费版，免费版只支持转换前3页，以免费版为例
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        com.e-iceblue
        http://repo.e-iceblue.cn/repository/maven-public/
    

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    e-iceblue
    spire.doc.free
    3.9.0

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/**
 * @Author：lzh
 * @Create：2022/11/19/18:04
 * @Description：html转换pdf
 * @Version：1.0
 */
public class Html3Pdf {

    public static void main(String[] args) throws IOException {

    }

    /**
     * 免费版，只支持前三页转换
     * @param inputHtml HTML地址
     * @param pdfName pdf保存地址
     * @throws IOException
     */
    public void  spireDoc(String inputHtml,String pdfName) throws IOException {
        inputHtml = "src/main/resources/html/index2.html";
        //新建Document对象
        Document doc = new Document();
        //添加section
        Section sec = doc.addSection();

//        将html转化为流字符串
        String htmlText = readTextFromFile(inputHtml);
        //添加段落并写入HTML文本
        sec.addParagraph().appendHTML(htmlText);
        pdfName = "src/main/resources/x4.pdf";
        //将文档另存为PDF
        doc.saveToFile(pdfName, FileFormat.PDF);
        doc.dispose();
    }


    /**
     * 将该路径的HTML页面转化为流字符串
     * @param fileName 文件地址
     * @return
     * @throws IOException
     */
    public static String readTextFromFile(String fileName) throws IOException {
        StringBuffer sb = new StringBuffer();
        BufferedReader br = new BufferedReader(new FileReader(fileName));
        String content;
        while ((content = br.readLine()) != null) {
            sb.append(content);
        }
        return sb.toString();
    }
}
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public class Html2Pdf {
     /**
      * HTML代码转PDF文档
      *
      * @param content 待转换的HTML代码
      * @param storagePath 保存为PDF文件的路径
      */
     public static void parsePdf(String content, String storagePath) {
         FileOutputStream os = null;
         try {
             File file = new File(storagePath);
             if(!file.exists()) {
                 file.createNewFile();
             }
             os = new FileOutputStream(file);
  
             ITextRenderer renderer = new ITextRenderer();
 //解决中文支持问题
 //            ITextFontResolver resolver = renderer.getFontResolver();
 //            resolver.addFont("simhei.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
 //            resolver.addFont("simhei.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
             renderer.setDocumentFromString(content);
 // 解决图片的相对路径问题,图片路径必须以file开头
 // renderer.getSharedContext().setBaseURL("file:/");
             renderer.layout();
             renderer.createPDF(os);
  
         } catch (DocumentException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }finally {
             if(null != os) {
                 try {
                     os.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }
  
     /**
      * 对Html要求特别严格
      * @param args
      * @throws IOException
      */
     public static void main(String[] args) throws IOException {
         String htmlFilePath = "";
         htmlFilePath = "F:/pdf/IText实现对PDF文档属性的基本设置 - 半亩池光 - 博客园.html";
         StringBuilder content = new StringBuilder();
         BufferedInputStream in;
         byte[] bys = new byte[1024];
         int len;
         in = new BufferedInputStream(new FileInputStream(htmlFilePath));
         while ((len = in.read(bys)) != -1) {
             content.append(new String(bys, 0, len));
         }
         String html = closeHTML(content.toString());
         html = html.replace(" "," ");
  
         parsePdf(html,"F:/pdf/wahaha.pdf");
  
     }
  
     public static String closeHTML(String str){
         List arrTags = new ArrayList();
         arrTags.add("br");
         arrTags.add("hr");
         arrTags.add("link");
         arrTags.add("meta");
         arrTags.add("img");
         arrTags.add("input");
         for(int i=0;i=0){
                     int tagEnd = str.indexOf(">",tagStart);
                     j = tagEnd;
                     String preCloseTag = str.substring(tagEnd-1,tagEnd);
                     if(!"/".equals(preCloseTag)){
                         String preStr = str.substring(0,tagEnd);
                         String afterStr = str.substring(tagEnd);
                         str = preStr + "/" + afterStr;
                     }
                 }else{
                     break;
                 }
             }
         }
         return str;
     }
  
 }
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public class HtmlToPDFUtil {
     public static void main(String[] args) throws Exception {
         //HtmlToPDFUtil htmlToPDFUtil = new HtmlToPDFUtil();
         HtmlToPDFUtil.generatePDF_2(new File("F:\pdf/demo_ch_pd4ml.pdf"),
                 "F:\pdf/flying saucer 使用中的一些问题 (java导出pdf) - 真的勇士，敢于直面这扯淡的人生 - ITeye博客.htm");
  
         //File pdfFile = new File("D:/Test/test3.pdf");
 //        String pdfPath = "D:/Test1/mmt";
 //
 //        File file = new File(pdfPath);
 //        if (!file.exists()) {
 //            file.mkdirs();
 //        }
 //        String pdfName = "aa.pdf";
 //        File pdfFile = new File(pdfPath+File.separator+pdfName);
 //        StringBuffer html = new StringBuffer();
 //        html.append("")
 //                .append("")
 //                .append("")
 //                .append("").append("")
 //                //.append("")
 //                .append("")
 //                .append("显示中文aaaaaaaaaa")
 //                .append("").append("");
 //        StringReader strReader = new StringReader(html.toString());
 //        HtmlToPDFUtil.generatePDF_1(pdfFile, strReader);
  
     }
  
     // 手动构造HTML代码
     public static void generatePDF_1(File outputPDFFile, StringReader strReader)
             throws Exception {
         FileOutputStream fos = new FileOutputStream(outputPDFFile);
         PD4ML pd4ml = new PD4ML();
         pd4ml.setPageInsets(new Insets(20, 10, 10, 10));
         pd4ml.setHtmlWidth(950);
         pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4));
         pd4ml.useTTF("java:fonts", true);        
         //pd4ml.setDefaultTTFs("KaiTi_GB2312", "KaiTi_GB2312", "KaiTi_GB2312");
         pd4ml.setDefaultTTFs("KaiTi", "KaiTi", "KaiTi");
         pd4ml.enableDebugInfo();
         pd4ml.render(strReader, fos);
     }
  
     // HTML代码来自于HTML文件
     public static void generatePDF_2(File outputPDFFile, String inputHTMLFileName)
             throws Exception {
         FileOutputStream fos = new FileOutputStream(outputPDFFile);
         PD4ML pd4ml = new PD4ML();
         pd4ml.setPageInsets(new Insets(20, 10, 10, 10));
         pd4ml.setHtmlWidth(950);
         pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4));
  
         pd4ml.useTTF("java:fonts", true);
         pd4ml.setDefaultTTFs("KaiTi", "KaiTi", "KaiTi");
         pd4ml.enableDebugInfo();
         pd4ml.render("file:" + inputHTMLFileName, fos);
     }
  
 }
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