我正在尝试使用Apache FOP 2.2生成PDF,但出现了一些问题我正在使用完整的URI,例如file:///Users/mac/Desktop/image.png
。这是myTemplate的一部分。
<fo:block>
<fo:external-graphic content-height="scale-to-fit" content-width="46.0mm"scaling="non-uniform" src="(here I put the upper URI)"/>
</fo:block>`.
I also got fop_config.xml in resources folder than looks like
`<fop version="1.0">
<renderers>
<renderer mime="application/pdf">
<auto-detect/>
<fonts>
<---! here are my fonts --->
</fonts>
</renderer>
</renderers>
</fop>
和我的脚本
val fopFactory = FopConfParser(File("fop_config.xml"))
.fopFactoryBuilder
.build()
val foUserAgent = fopFactory.newFOUserAgent()
val outStream = BufferedOutputStream(FileOutputStream(File("my_pdf.pdf")))
outStream.use { out ->
val fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out)
val transformer = TransformerFactory.newInstance().newTransformer()
val src = StreamSource(StringReader(myTemplate))
val res = SAXResult(fop.defaultHandler)
transformer.setParameter("versionParam", "2.0")
transformer.transform(src, res)
}
我正在使用Kotlin,但这并不重要。我可以通过IDEA很好地渲染,但是当我用shadowJar Gradle插件创建胖罐时,SEVERE: Image not found. URI: file:///Users/mac/Desktop/image.png. (No context info available)
为什么我不能在fatJar中使用URI以及如何解决它?
UPD
我发现我的问题与ImagePreloader有关。例外
org.apache.xmlgraphics.image.loader.ImageException: The file format is not supported. No ImagePreloader found for file:///Users/mac/Desktop/image.png
但是它只是在Jar里面!怎么可能?
最后我发现问题出在依赖项上。由于某些原因,如果xmlgraphics-commons作为fop的传递依赖项下载,则无法解析ImagePreloader。解决的方法是从:
更改Gradle脚本。compile('org.apache.xmlgraphics:fop:2.1')
至:
compile('org.apache.xmlgraphics:xmlgraphics-commons:2.1')
compile('org.apache.xmlgraphics:fop:2.1') {
exclude group:'org.apache.xmlgraphics', module: 'xmlgraphics-commons'
}