使用 pdfbox 2.0.8 时块类型无效
Invalid block type while using pdfbox 2.0.8
我正在尝试使用 PDFBox 从 PDF 中获取文本，但我 运行 遇到了异常。这是我用来进行文本剥离的代码。
try
{
PDDocument document = PDDocument.load(decodedPdfDocument.getBytes());
PDFTextStripper Tstripper = new PDFTextStripper();
String st = Tstripper.getText(document);
System.out.println("Text:" + st);
}
catch (Exception e)
{
e.printStackTrace();
}
这是我遇到的异常。
java.io.IOException: java.util.zip.DataFormatException: invalid block type
at org.apache.pdfbox.filter.FlateFilter.decode(FlateFilter.java:83)
at org.apache.pdfbox.cos.COSInputStream.create(COSInputStream.java:69)
at org.apache.pdfbox.cos.COSStream.createInputStream(COSStream.java:167)
at org.apache.pdfbox.pdmodel.PDPage.getContents(PDPage.java:155)
at org.apache.pdfbox.pdfparser.PDFStreamParser.<init>(PDFStreamParser.java:91)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:485)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:469)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:150)
at org.apache.pdfbox.text.LegacyPDFStreamEngine.processPage(LegacyPDFStreamEngine.java:139)
at org.apache.pdfbox.text.PDFTextStripper.processPage(PDFTextStripper.java:391)
at org.apache.pdfbox.text.PDFTextStripper.processPages(PDFTextStripper.java:319)
at org.apache.pdfbox.text.PDFTextStripper.writeText(PDFTextStripper.java:266)
at org.apache.pdfbox.text.PDFTextStripper.getText(PDFTextStripper.java:227)
at com.cerner.fsi.testing.xds.provideandregister.ClinicalEventInErrorTest.testProvideAndRegisterCDAWrappedDocument_ClinicalEventInError(ClinicalEventInErrorTest.java:117)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
at org.junit.runners.ParentRunner.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access[=11=]0(ParentRunner.java:42)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:184)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at com.cerner.fsi.testing.xds.EnterpriseClientSpringJUnit4ClassRunner.run(EnterpriseClientSpringJUnit4ClassRunner.java:50)
at com.cerner.fsi.testing.xds.EnterpriseClientSpringJUnit4ClassRunner.run(EnterpriseClientSpringJUnit4ClassRunner.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:356)
at com.cerner.fsi.testing.xds.EnterpriseClientSpringJUnit4ClassRunner.evaluate(EnterpriseClientSpringJUnit4ClassRunner.java:43)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.util.zip.DataFormatException: invalid block type
at java.util.zip.Inflater.inflateBytes(Native Method)
at java.util.zip.Inflater.inflate(Inflater.java:259)
at java.util.zip.Inflater.inflate(Inflater.java:280)
at org.apache.pdfbox.filter.FlateFilter.decompress(FlateFilter.java:108)
at org.apache.pdfbox.filter.FlateFilter.decode(FlateFilter.java:74)
... 49 more
我 运行 PDF 通过了验证，它是一个有效的 1.4 PDF。我还能够使用 Foxit 和 Acrobat 前端工具提取文本。不太确定我在这里做错了什么，这是我第一次使用这个 API.
根据 OP 的评论
The decodedPdfDocument comes from decoding a Base64 string. I'm creating a new string using new String(Base64.decode(documentString), "UTF-8");
这是错误。永远不要将二进制内容（如 PDF）视为文本！相反，让解码后的 PDF 文档保持 byte[]:
documentString = [...your base64 encoded PDF ...];
byte[] decodedPdfDocument = Base64.decode(documentString);
...
PDDocument document = PDDocument.load(decodedPdfDocument);
PDFTextStripper textStripper = new PDFTextStripper();
String st = textStripper.getText(document);
作为背景：当你做类似
的事情时
String string = new String(bytes, encoding);
对于 byte[] bytes，您的 bytes 被解码，假设它们包含使用 encoding.
编码为字节的文本
如果您的 bytes 不是使用 encoding 编码的文本，此过程可能具有破坏性，根据假定编码没有意义的字节序列将被转换为替换字符String。当您稍后使用 getBytes() 从字符串中检索字节时，您将检索替换字符的表示而不是原始字节序列。
我正在尝试使用 PDFBox 从 PDF 中获取文本，但我 运行 遇到了异常。这是我用来进行文本剥离的代码。
try
{
PDDocument document = PDDocument.load(decodedPdfDocument.getBytes());
PDFTextStripper Tstripper = new PDFTextStripper();
String st = Tstripper.getText(document);
System.out.println("Text:" + st);
}
catch (Exception e)
{
e.printStackTrace();
}
这是我遇到的异常。
java.io.IOException: java.util.zip.DataFormatException: invalid block type
at org.apache.pdfbox.filter.FlateFilter.decode(FlateFilter.java:83)
at org.apache.pdfbox.cos.COSInputStream.create(COSInputStream.java:69)
at org.apache.pdfbox.cos.COSStream.createInputStream(COSStream.java:167)
at org.apache.pdfbox.pdmodel.PDPage.getContents(PDPage.java:155)
at org.apache.pdfbox.pdfparser.PDFStreamParser.<init>(PDFStreamParser.java:91)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:485)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:469)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:150)
at org.apache.pdfbox.text.LegacyPDFStreamEngine.processPage(LegacyPDFStreamEngine.java:139)
at org.apache.pdfbox.text.PDFTextStripper.processPage(PDFTextStripper.java:391)
at org.apache.pdfbox.text.PDFTextStripper.processPages(PDFTextStripper.java:319)
at org.apache.pdfbox.text.PDFTextStripper.writeText(PDFTextStripper.java:266)
at org.apache.pdfbox.text.PDFTextStripper.getText(PDFTextStripper.java:227)
at com.cerner.fsi.testing.xds.provideandregister.ClinicalEventInErrorTest.testProvideAndRegisterCDAWrappedDocument_ClinicalEventInError(ClinicalEventInErrorTest.java:117)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
at org.junit.runners.ParentRunner.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access[=11=]0(ParentRunner.java:42)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:184)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at com.cerner.fsi.testing.xds.EnterpriseClientSpringJUnit4ClassRunner.run(EnterpriseClientSpringJUnit4ClassRunner.java:50)
at com.cerner.fsi.testing.xds.EnterpriseClientSpringJUnit4ClassRunner.run(EnterpriseClientSpringJUnit4ClassRunner.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:356)
at com.cerner.fsi.testing.xds.EnterpriseClientSpringJUnit4ClassRunner.evaluate(EnterpriseClientSpringJUnit4ClassRunner.java:43)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.util.zip.DataFormatException: invalid block type
at java.util.zip.Inflater.inflateBytes(Native Method)
at java.util.zip.Inflater.inflate(Inflater.java:259)
at java.util.zip.Inflater.inflate(Inflater.java:280)
at org.apache.pdfbox.filter.FlateFilter.decompress(FlateFilter.java:108)
at org.apache.pdfbox.filter.FlateFilter.decode(FlateFilter.java:74)
... 49 more
我 运行 PDF 通过了验证，它是一个有效的 1.4 PDF。我还能够使用 Foxit 和 Acrobat 前端工具提取文本。不太确定我在这里做错了什么，这是我第一次使用这个 API.
根据 OP 的评论
The
decodedPdfDocumentcomes from decoding a Base64 string. I'm creating a new string usingnew String(Base64.decode(documentString), "UTF-8");
这是错误。永远不要将二进制内容（如 PDF）视为文本！相反，让解码后的 PDF 文档保持 byte[]:
documentString = [...your base64 encoded PDF ...];
byte[] decodedPdfDocument = Base64.decode(documentString);
...
PDDocument document = PDDocument.load(decodedPdfDocument);
PDFTextStripper textStripper = new PDFTextStripper();
String st = textStripper.getText(document);
作为背景：当你做类似
的事情时String string = new String(bytes, encoding);
对于 byte[] bytes，您的 bytes 被解码，假设它们包含使用 encoding.
如果您的 bytes 不是使用 encoding 编码的文本，此过程可能具有破坏性，根据假定编码没有意义的字节序列将被转换为替换字符String。当您稍后使用 getBytes() 从字符串中检索字节时，您将检索替换字符的表示而不是原始字节序列。