寻找高效的X3D文件阅读器组件或Java代码片段

Question

旧版Java应用正在读取CAD X3D文件和缺少的几何数据。我已经在网上搜索并寻找“ 动手专家意见/建议”以获取用于读取X3D文件的组件或Java代码段。

谢谢

示例代码：

public Element loadGraphicsFile(File graphicsFile) throws Exception {
    Element sceneRoot = null;   
    InputStream stream = null;

    try {
        String fileName = graphicsFile.getName();
        if(fileName.endsWith(".gz") || fileName.endsWith(".x3dz")) {
            stream = new GZIPInputStream(new FileInputStream(graphicsFile));
        } 
        else {
            stream = new FileInputStream(graphicsFile);
        }

        SAXBuilder builder = new SAXBuilder();
        Document fileDocument = builder.build(stream);

        Element docRoot = fileDocument.getRootElement();    // <X3D/>
        Element topSceneRoot = docRoot.getChild("Scene");   // <Scene>
        sceneRoot = topSceneRoot.getChild("Transform");     // <Transform>
        Element tempRoot = sceneRoot.getChild("Transform"); // Nested <Transform>
        if(tempRoot != null) {  //some (CATIA?) have 2nd transform level
            sceneRoot = tempRoot;   
        } finally {
            if(stream != null) stream.close();
        }

        return sceneRoot;
    }
}