使用Batik将svg转换为图像时的TranscoderException

Question

我正在尝试将svg内容转换为pdf或png文件。我正在使用Batik来做这件事。我的代码如下：

Transcoder transcoder = new PDFTranscoder();
TranscoderOutput transcoderOutput = new TranscoderOutput(new FileOutputStream(new File(outputFilePath + "\\" + outputFileName + ".pdf")));
transcoder.transcode(transcoderInput, transcoderOutput);

但是，我得到了以下异常：

Exception in thread "main" org.apache.batik.transcoder.TranscoderException: null
Enclosed Exception:
Content is not allowed in prolog.
    at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:226)
    at org.apache.batik.transcoder.image.ImageTranscoder.transcode(ImageTranscoder.java:92)
    at org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(XMLAbstractTranscoder.java:142)
    at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:156)
    at com.we.poc.svgConverterdemo.conv.POC.main(POC.java:35)
Caused by: org.apache.batik.bridge.BridgeException: Content is not allowed in prolog.
    at org.apache.batik.bridge.BridgeContext.getReferencedNode(BridgeContext.java:788)
    at org.apache.batik.bridge.BridgeContext.getReferencedElement(BridgeContext.java:804)
    at org.apache.batik.bridge.PaintServer.convertURIPaint(PaintServer.java:365)
    at org.apache.batik.bridge.PaintServer.convertPaint(PaintServer.java:273)
    at org.apache.batik.bridge.PaintServer.convertFillPaint(PaintServer.java:242)
    at org.apache.batik.bridge.PaintServer.convertFillAndStroke(PaintServer.java:160)
    at org.apache.batik.bridge.SVGShapeElementBridge.createShapePainter(SVGShapeElementBridge.java:117)
    at org.apache.batik.bridge.SVGDecoratedShapeElementBridge.createFillStrokePainter(SVGDecoratedShapeElementBridge.java:58)
    at org.apache.batik.bridge.SVGDecoratedShapeElementBridge.createShapePainter(SVGDecoratedShapeElementBridge.java:84)
    at org.apache.batik.bridge.SVGShapeElementBridge.buildGraphicsNode(SVGShapeElementBridge.java:91)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:224)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.build(GVTBuilder.java:141)
    at org.apache.batik.bridge.SVGImageElementBridge.createSVGImageNode(SVGImageElementBridge.java:697)
    at org.apache.batik.bridge.SVGImageElementBridge.createImageGraphicsNode(SVGImageElementBridge.java:296)
    at org.apache.batik.bridge.SVGImageElementBridge.buildImageGraphicsNode(SVGImageElementBridge.java:179)
    at org.apache.batik.bridge.SVGImageElementBridge.createGraphicsNode(SVGImageElementBridge.java:121)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:213)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219)
    at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)
    at org.apache.batik.bridge.GVTBuilder.build(GVTBuilder.java:82)
    at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:208)
    ... 4 more

Answer 1

从堆栈跟踪来看，一些填充定义似乎引用了外部文件。仔细查看文件，确保它是valid XML

org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(XMLAbstractTranscoder.java:142)上的

..。由以下原因引起：

org.apache.batik.bridge.BridgeException: prolog中不允许包含内容。

在org.apache.batik.bridge.BridgeContext.getReferencedNode(BridgeContext.java:788)

在org.apache.batik.bridge.BridgeContext.getReferencedElement(BridgeContext.java:804)

在org.apache.batik.bridge.PaintServer.convertURIPaint(PaintServer.java:365)

在org.apache.batik.bridge.PaintServer.convertPaint(PaintServer.java:273)

在org.apache.batik.bridge.PaintServer.convertFillPaint(PaintServer.java:242)