Cannot read JBIG2 image

2025-10-26 02:38:50

1、添加levigo-jbig2-imageio插件：

针对jdk1.7或以上的：

建议组合：PDFbox的2.07版本+levigo-jbig2-imageio的2.0版本。

如：

<dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>pdfbox</artifactId> <version>2.0.7</version> </dependency>  <dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>pdfbox-tools</artifactId> <version>2.0.7</version> </dependency>  <dependency> <groupId>com.levigo.jbig2</groupId> <artifactId>levigo-jbig2-imageio</artifactId> <version>2.0</version> </dependency>

针对jdk1.6的：

报错：java.lang.UnsupportedClassVersionError: com/levigo/jbig2/JBIG2ImageReaderSpi : Unsupported major.minor version 51.0 (unable to load class com.levigo.jbig2.JBIG2ImageReaderSpi)

于是将levigo-jbig2-imageio降为1.6.5版本，又报错：

org.apache.pdfbox.contentstream.PDFStreamEngine.operatorException(875) | Cannot read JBIG2 image: jbig2-imageio is not installed

于是怒了，查看PDFbox源码分析，发现jbig2-imageio在jdk1.6时，兼容性问题？？？？？

百度百度.........发现有个JavaX的东东？？？

然后，发现了rt.jar中有一个javax.imageio.spi包下，有一些类提供的图所示。

再分析发现，ImageIO类中扫描插件注册函数，

public static void scanForPlugins() { theRegistry.registerApplicationClasspathSpis(); }

2、经分析测试，在jdk1.6版本下，应将levigo-jbig2-imageio降为1.6.5版本，且在调用PDFRenderer renderer = new PDFRenderer(document);

添加代码：

ImageIO.scanForPlugins();

3、 <dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>pdfbox</artifactId> <version>2.0.7</version> </dependency>  <dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>pdfbox-tools</artifactId> <version>2.0.7</version> </dependency>  <dependency> <groupId>com.levigo.jbig2</groupId> <artifactId>levigo-jbig2-imageio</artifactId> <version>1.6.5</version> </dependency> <dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcprov-jdk15on</artifactId> <version>1.54</version> </dependency> <dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcmail-jdk15on</artifactId> <version>1.54</version> </dependency> <dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcpkix-jdk15on</artifactId> <version>1.54</version> </dependency>

4、 PDDocument document = null; boolean failed = false; File file = new File(pdfPath); System.out.println("Opening: " + file.getName()); try { new FileOutputStream(new File(path, file.getName() + ".parseerror")).close(); document = PDDocument.load(file, (String)null); String outputPrefix = path + '/' + file.getName() + "-"; int numPages = document.getNumberOfPages(); if (numPages < 1) { failed = true; System.out.println("file " + file.getName() + " has < 1 page"); } else { new File(path, file.getName() + ".parseerror").delete(); } ImageIO.scanForPlugins(); PDFRenderer renderer = new PDFRenderer(document); for (int i = 0; i < numPages; i++) { Map map = new HashMap<String, String>(); String fileName = outputPrefix + (i + 1) + ".png"; BufferedImage image = renderer.renderImageWithDPI(i, 96); // Windows native DPI ImageIO.write(image, "PNG", new File(fileName)); }

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