無法刪除文件，因爲它是在使用

Question

我會第一時間發佈代碼，然後闡述：

public void createPackage(String uploadedZipLocation) throws BadException, IOException, SAXException { 
    String extractedFolderPath = uploadedZipLocation.split("\\.zip")[0]; 
    File tempFolder = null; 
    Source xml = null; 
    try { 
     xml = new StreamSource(extractedFolderPath + "/web.xml"); 
     validatePkgXml(xml, extractedFolderPath + "/web.xml"); 
     xml = null; 
    } catch (IOException e) { 
     throw e; 
    } catch (BadException bpe) { 
     xml = null; 
     tempFolder = new File(extractedFolderPath); 
     FileUtils.deleteDirectory(tempFolder); // **** Can't delete the folder because it is in use. web.xml is still being read in validatePkgXml I think 
     throw bpe; 
    } 
} 


private void validatePkgXml(Source xmlStream, String xmlPath) throws BadException, IOException, SAXException{ 
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); 
    Schema schema = schemaFactory.newSchema(new File("/C:/workspacesFresh2/web.xsd")); 
    Validator validator = schema.newValidator(); 
    validator.setErrorHandler(new PackageXMLValidationErrorHandler()); 
    try { 
     validator.validate(xmlStream); 
     logger.info(xmlStream.getSystemId() + " is valid"); 
    } catch (SAXException e) { 
     logger.error(xmlStream.getSystemId() + " is NOT valid"); 
     throw new BadException(xmlPath, e.getLocalizedMessage()); 
    } 
} 

我試圖得到一個XML文件，並驗證它針對xsd架構。如果驗證失敗，我想刪除包含xml文件的文件夾。當驗證失敗時，我無法刪除該文件夾，因爲web.xml仍在使用中。我已經嘗試在驗證失敗後將Source設置爲null，但web.xml仍以某種方式仍在使用中。任何想法如何解鎖文件，以便我可以刪除它？備註：如果驗證成功，則刪除文件夾也會成功。

Answer 1

您需要在刪除文件夾之前關閉InputStream。

我沒有測試此代碼，但它應該給你的想法：

public void createPackage(String uploadedZipLocation) throws BadException, IOException, SAXException { 
    String extractedFolderPath = uploadedZipLocation.split("\\.zip")[0]; 
    File tempFolder = null; 
    StreamSource xml = null; 
    FileInputStream file = null; 

    try { 
     file = new FileInputStream(extractedFolderPath + "/web.xml"); 
     xml = new StreamSource(file); 
     validatePkgXml(xml, extractedFolderPath + "/web.xml"); 
     xml.getInputStream().close(); 
     //xml = null; 
    } catch (IOException e) { 
     xml.getInputStream().close(); 
     throw e; 
    } catch (BadException bpe) { 
     //xml = null; 
     xml.getInputStream().close(); 
     tempFolder = new File(extractedFolderPath); 
     FileUtils.deleteDirectory(tempFolder); // **** Can't delete the folder because it is in use. web.xml is still being read in validatePkgXml I think 
     throw bpe; 
    } 
} 

希望工程！祝你好運！

btw。您應始終關閉文件和流以避免內存泄漏，從而導致OutOfMemoryException和ConcurrentModificationException異常。 [/編輯]

Answer 2

嘗試

public void createPackage(String uploadedZipLocation) throws BadException, IOException, SAXException { 
    String extractedFolderPath = uploadedZipLocation.split("\\.zip")[0]; 
    File tempFolder = null; 
    FileInputStream file = null; 
    Source xml = null; 
    try { 
     file = new FileInputStream(extractedFolderPath + "/web.xml"); 
     xml = new StreamSource(file); 
     validatePkgXml(xml, extractedFolderPath + "/web.xml"); 
     xml = null; 
    } catch (IOException e) { 
     throw e; 
    } catch (BadException bpe) { 
     file.close(); 
     tempFolder = new File(extractedFolderPath); 
     FileUtils.deleteDirectory(tempFolder); 
     throw bpe; 
    } 
}