TikaException：解析PDF时无法关闭临时资源

问题描述

我在Windows 10 jre 1.8.0_241上使用Apache Tika，并且已经使用ant导入了Tika 1.24.1。我有以下代码从PDF中提取内容：

public class TikaExtraction {
    
   public static void main(final String[] args) throws IOException,TikaException {

      //Assume sample.txt is in your current directory              
      File file = new File("C:\\Users\\myPC\\Desktop\\testPDF.pdf");
      
      //Instantiating Tika facade class
      Tika tika = new Tika();
      String filecontent = tika.parseToString(file);
      System.out.println("Extracted Content: " + filecontent);
      
   }         
}

得到以下异常：

Exception in thread "main" org.apache.tika.exception.TikaException: Failed to close temporary resources
    at org.apache.tika.io.TemporaryResources.dispose(TemporaryResources.java:174)
    at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:150)
    at org.apache.tika.Tika.parseToString(Tika.java:527)
    at com.oracle.cegbu.filesearch.service.kafka.TikaExtraction.main(TikaExtraction.java:28)
Caused by: java.nio.file.FileSystemException: C:\Users\myPC\AppData\Local\Temp\apache-tika-6518312717498705085.tmp: The process cannot access the file because it is being used by another process.

    at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
    at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
    at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
    at sun.nio.fs.WindowsFileSystemProvider.implDelete(Unknown Source)
    at sun.nio.fs.AbstractFileSystemProvider.delete(Unknown Source)
    at java.nio.file.Files.delete(Unknown Source)
    at org.apache.tika.io.TemporaryResources$1.close(TemporaryResources.java:84)
    at org.apache.tika.io.TemporaryResources.close(TemporaryResources.java:145)
    at org.apache.tika.io.TemporaryResources.dispose(TemporaryResources.java:172)
    ... 3 more

解决方法

让我们尝试在资源尝试中使用inputStream而不是File

public class TikaExtraction {
public static void main(final String[] args) throws IOException,TikaException {

    //Assume sample.txt is in your current directory     
    Tika tika = new Tika();
    File file = new File("C:\\Users\\myPC\\Desktop\\testPDF.pdf");

    //Instantiating Tika facade class
    try(InputStream inputStream = new FileInputStream(file)) {
        String filecontent = tika.parseToString(inputStream);
        System.out.println("Extracted Content: " + filecontent);
    }
    
}

}