无法删除文件，因为它正在使用中答案

【问题标题】：Cannot delete file because it is in use无法删除文件，因为它正在使用中
【发布时间】：2013-08-06 15:39:14
【问题描述】：

我先贴出代码，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());
    }
}

我正在尝试获取一个 xml 文件并根据 xsd 架构对其进行验证。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。在验证失败后，我尝试将Source 设置为null，但web.xml 不知何故仍在使用中。任何想法如何解锁文件以便我可以删除它？旁注：如果验证成功，则删除文件夹也成功。

【问题讨论】：

标签： java file stream delete-file

【解决方案1】：

您需要在删除文件夹之前关闭 InputStream。

我没有测试过这段代码，但它应该给你的想法：

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]

【讨论】：

我找不到getInputStream() 方法。
我需要使用StreamSource 而不仅仅是Source 来获取该方法。
^^ 是的，我在示例代码中更正了它。现在上班了吗？
很可能我们现在可以直接关闭 FileInputStream，而不是使用 StreamSource 上的 getINputStream 方法。
是的，我刚刚看到了那个编辑。这似乎非常重要。谢谢你的帮助。现在完美运行！

【解决方案2】：

试试

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;
    }
}

【讨论】：

使用File 作为new StreamSource(File ...) 的参数有助于解决我的问题！谢谢