java - 如何在Java中将HTML文件转换为PDF？

Question

我正在尝试开发一个应用程序，它将 html 文件或 url 作为输入并呈现与 PDF 文件相同的效果。我正在使用 yahp 来达到这个目的。我已经导入了 yahp.jar 文件，但是我遇到了以下异常:

java.lang.ClassNotFoundException: org.allcolor.yahp.cl.converter.CHtmlToPdfFlyingSaucerTransformer
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.allcolor.yahp.converter.CClassLoader.findClass(CClassLoader.java:1495)
at org.allcolor.yahp.converter.CClassLoader.findClass(CClassLoader.java:1477)
at org.allcolor.yahp.converter.CClassLoader.loadClass(CClassLoader.java:2056)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.allcolor.yahp.converter.CYaHPConverter.getTransformer(CYaHPConverter.java:383)
at org.allcolor.yahp.converter.CYaHPConverter.convertToPdf(CYaHPConverter.java:246)
at HtmlToPDF.htmlToPdfFile(HtmlToPDF.java:74)
at HtmlToPDF.main(HtmlToPDF.java:52)
SEVERE: Error while getting   transformer 'org.allcolor.yahp.cl.converter.CHtmlToPdfFlyingSaucerTransformer' ! :        org.allcolor.yahp.cl.converter.CHtmlToPdfFlyingSaucerTransformer
org.allcolor.yahp.converter.IHtmlToPdfTransformer$CConvertException
at org.allcolor.yahp.converter.CYaHPConverter.convertToPdf(CYaHPConverter.java:255)
at HtmlToPDF.htmlToPdfFile(HtmlToPDF.java:74)Done

at HtmlToPDF.main(HtmlToPDF.java:52)
Caused by: java.lang.NullPointerException
at org.allcolor.yahp.converter.CYaHPConverter.convertToPdf(CYaHPConverter.java:247)
... 2 more
Destroying YAHP ClassLoader Tree
Exception in thread "AWT-Windows" java.lang.IllegalStateException: Shutdown in progress
at java.lang.ApplicationShutdownHooks.add(Unknown Source)
at java.lang.Runtime.addShutdownHook(Unknown Source)
at sun.awt.windows.WToolkit.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Answer 1

iText“XML Worker”允许开发人员以程序员友好的方式将 XML 文件转换为 PDF 文档。 iText 还可以使用 HTML 元素上实现的 CSS 样式将 HTML 转换为 PDF。看this