有没有关闭现有的FileInputStream删除？ [英] is there an existing FileInputStream delete on close?

问题描述

有没有一种方法可以让 FileInputStream 在关闭时自动删除底层文件？

我打算让自己的实用程序类扩展 FileInputStream 并自己做，但我有点儿惊讶的是没有东西已经存在。

edit：用例是我有一个返回 InputStream 从一个页面下载文件。据我所知，当动作完成时，我不会收到通知，或者 FileInputStream 不再被使用，而且我不希望大）的临时文件，生成要下载左转。

这个问题不是Struts 2的具体问题，所以我原来并没有包含这些信息，问题。

解决方案

标准库中没有这样的东西，也没有任何的apache-commons库，所以像：

  public class DeleteOnCloseFileInputStream扩展FileInputStream {
 private文件文件; 
 public DeleteOnCloseFileInputStream（String fileName）抛出FileNotFoundException {
 this（new File（fileName））; 
 
 public DeleteOnCloseFileInputStream（File file）throws FileNotFoundException {
 super（file）; 
 this.file = file; 
 
 $ b $ public void close（）throws IOException {
 try {
 super.close（）; 
} finally {
 if（file！= null）{
 file.delete（）; 
 file = null; 
} 
} 
} 
} 
  

Is there an existing way to have a FileInputStream delete the underlying file automatically when closed?

I was planning to make my own utility class to extend FileInputStreamand do it myself, but I'm kinda surprised that there isn't something already existing.

edit: Use case is that I have a Struts 2 action that returns an InputStream for file download from a page. As far as I can tell, I don't get notified when the action is finished, or the FileInputStream is not in use anymore, and I don't want the (potentially large) temporary files that are generated to be downloaded left lying around.

The question wasn't Struts 2 specific, so I didn't include that info originally and complicate the question.

解决方案

There's no such thing in the standard libraries, and not any of the apache-commons libs either , so something like:

public class DeleteOnCloseFileInputStream extends FileInputStream {
   private File file;
   public DeleteOnCloseFileInputStream(String fileName) throws FileNotFoundException{
      this(new File(fileName));
   }
   public DeleteOnCloseFileInputStream(File file) throws FileNotFoundException{
      super(file);
      this.file = file;
   }

   public void close() throws IOException {
       try {
          super.close();
       } finally {
          if(file != null) {
             file.delete();
             file = null;
         }
       }
   }
}

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