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");}}

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();}}
}

linux版本参考：https://blog.csdn.net/l_learning/article/details/124396757

方法二：使用Itext

1、引入依赖

<!-- 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>

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;}@Overridepublic 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 {@Overridepublic 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、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<b>,0<b/>* @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&nbsp;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&nbsp;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;}}

4、测试

@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);}
}

5、注意事项

页面中不能出现html的特殊字符标记，如等（代码中已经处理，所有都替换为空）可忽略
页面中的图片路径，必须是在项目根路径后面的所有地址（相对路径）
页面中的标签要符合规范，必须都具有结束标签等

方法三：使用Spire.Doc

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

1、增加一个maven仓库路径

<repositories><repository><id>com.e-iceblue</id><url>http://repo.e-iceblue.cn/repository/maven-public/</url></repository>
</repositories>

依赖

<!--    免费版，只支持前三页转化 -->
<dependency><groupId>e-iceblue</groupId><artifactId>spire.doc.free</artifactId><version>3.9.0</version>
</dependency>

2、转换工具类

/*** @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sectionSection 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PDFdoc.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();}
}

可参考：https://blog.csdn.net/csdnerM/article/details/120649237

方法四：使用Flying Sauser(技术老旧，对样式不支持)

Flying Sauser实现html2pdf，纠错能力差，支持中文、支持简单的页面和样式，开源
对html代码要求很严格。极易出现中文乱码问题

实现：

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<arrTags.size();i++){for(int j=0;j<str.length();){int tagStart = str.indexOf("<"+arrTags.get(i),j);if(tagStart>=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;}}

方法五：使用PD4ML（样式有问题）

PD4ML是纯Java的类库，使用HTML、CSS作为页面布局和内容定义格式来生成PDF文档的强大工具，可以简化最终用户生成PDF的工作。参考网站：http://www.pd4ml.com
可参考：https://github.com/linkamnal/Html2Pdf
工具类：

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("<html>")//                .append("<head>")//                .append("<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />")//                .append("</head>").append("<body>")//                //.append("<font face='KaiTi_GB2312'>")//                .append("<font face='KaiTi'>")//                .append("<font color='red' size=22>显示中文aaaaaaaaaa</font>")//                .append("</font>").append("</body></html>");//        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);}}