捕获 IIOException 已捕获的问题

如何解决捕获 IIOException 已捕获的问题

我目前正在编写一个程序，该程序从不同来源读取大量图片以使用 PDFBox 生成 PDF。 有些图片抛出IIOException，没关系，我抓到了，通知用户图片无法读取。 其他一些也抛出 IIOException:

javax.imageio.IIOException: JFIF APP0 必须是 SOI 之后的第一个标记

没有被我的 try-catch 块捕获。我怎样才能让每张抛出这个异常的图片都具有相同的行为。

这是我的 try-catch 块：

83    try {
84      if (new File(picture).exists()) {
85          // Some pictures throws an exception here 
86          PDImageXObject pdImage = PDImageXObject.createFromFile(picture,document);
87          contentStream.drawImage(pdImage,x,y,width,height);
88      } else {
89          PDImageXObject pdImage = PDImageXObject.createFromFile(defaultPicture,document);
90          contentStream.drawImage(pdImage,height);
91      }
92          
93  } catch(IIOException e) {
94      PDImageXObject pdImage = PDImageXObject.createFromFile(defaultPicture,document);
95      contentStream.drawImage(pdImage,height);
96      System.out.println("Problem reading this file : " + picture);
97  }

编辑： 堆栈跟踪：

javax.imageio.IIOException: JFIF APP0 must be first marker after SOI
    at com.sun.imageio.plugins.jpeg.JPEGMetadata.<init>(JPEGMetadata.java:224)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.getimageMetadata(JPEGImageReader.java:1023)
    at org.apache.pdfBox.pdmodel.graphics.image.JPEGFactory.getNumComponentsFromImageMetadata(JPEGFactory.java:213)
    at org.apache.pdfBox.pdmodel.graphics.image.JPEGFactory.retrieveDimensions(JPEGFactory.java:182)
    at org.apache.pdfBox.pdmodel.graphics.image.JPEGFactory.createFromByteArray(JPEGFactory.java:103)
    at org.apache.pdfBox.pdmodel.graphics.image.JPEGFactory.createFromStream(JPEGFactory.java:85)
    at org.apache.pdfBox.pdmodel.graphics.image.PDImageXObject.createFromFileByExtension(PDImageXObject.java:241)
    at org.apache.pdfBox.pdmodel.graphics.image.PDImageXObject.createFromFile(PDImageXObject.java:202)
    at myClass(ServiceGenerationPDF.java:85)
    at 
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setpressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6535)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
    at java.awt.Component.processEvent(Component.java:6300)
    at java.awt.Container.processEvent(Container.java:2236)
    at java.awt.Component.dispatchEventImpl(Component.java:4891)
    at java.awt.Container.dispatchEventImpl(Container.java:2294)
    at java.awt.Component.dispatchEvent(Component.java:4713)
    at java.awt.Lightweightdispatcher.retargetMouseEvent(Container.java:4888)
    at java.awt.Lightweightdispatcher.processMouseEvent(Container.java:4525)
    at java.awt.Lightweightdispatcher.dispatchEvent(Container.java:4466)
    at java.awt.Container.dispatchEventImpl(Container.java:2280)
    at java.awt.Window.dispatchEventImpl(Window.java:2750)
    at java.awt.Component.dispatchEvent(Component.java:4713)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.awt.EventQueue$4.run(EventQueue.java:731)
    at java.awt.EventQueue$4.run(EventQueue.java:729)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
    at java.awt.EventdispatchThread.pumpOneEventForFilters(EventdispatchThread.java:201)
    at java.awt.EventdispatchThread.pumpEventsForFilter(EventdispatchThread.java:116)
    at java.awt.EventdispatchThread.pumpEventsForHierarchy(EventdispatchThread.java:105)
    at java.awt.EventdispatchThread.pumpEvents(EventdispatchThread.java:101)
    at java.awt.EventdispatchThread.pumpEvents(EventdispatchThread.java:93)
    at java.awt.EventdispatchThread.run(EventdispatchThread.java:82)```

解决方法

您不应该将实际处理代码作为 catch 块的一部分。话虽如此，但抛出的是 catch 块中的 PDImageXObject.createFromFile 。由于它不在单独的 try/catch 块中，因此不会捕获异常。

如果你试试这段代码，你会看到每个 IIOException 都被捕获了。

try {
    if (new File(picture).exists()) {
        // Some pictures throws an exception here 
        PDImageXObject pdImage = PDImageXObject.createFromFile(picture,document);
        contentStream.drawImage(pdImage,x,y,width,height);
    } else {
        PDImageXObject pdImage = PDImageXObject.createFromFile(defaultPicture,height);
    }
        
} catch(IIOException e) {
    System.out.println("Problem reading this file : " + picture);
}