java - 无法删除文件，因为该文件正在使用中

Question

我先贴出代码，然后再详细说明:

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());
    }
}

我正在尝试获取 xml 文件并根据 xsd 架构验证它。如果验证失败，我想删除包含xml文件的文件夹。当验证失败时，我无法删除该文件夹，因为 web.xml 仍在使用中。我尝试在验证失败后将 Source 设置为 null，但 web.xml 不知何故仍在使用中。有什么想法如何解锁该文件以便我可以删除它吗？附注:如果验证成功，则删除文件夹也成功。

Answer 1

删除文件夹之前需要关闭InputStream。

我还没有测试过这段代码，但它应该能给你一个想法:

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;
    }
}

希望它有效!祝你好运!

[编辑]顺便提一句。您应该始终关闭文件和流以避免内存泄漏，从而导致 OutOfMemoryExceptions 和 ConcurrentModificationExceptions。[/编辑]