删除java中的临时文件
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delete temporary file in java
提问by
I'm creating temporary file in java but i'm unable to delete it. This is the code I have written:
我正在用 java 创建临时文件，但我无法删除它。这是我写的代码：
temp = File.createTempFile("temp", ".txt");
temp.deleteOnExit();
fileoutput = new FileWriter(temp);
buffout = new BufferedWriter(fileoutput);
回答by Mnementh
Add the following code (after you have done your operations with the file):
添加以下代码（在对文件完成操作之后）：
buffout.close();
fileoutput.close();
temp.delete();
As long as some stream on the file is open, it is locked (at least on the windows-implementation of the JVM). So it cannot be deleted.
只要文件上的某个流打开，它就会被锁定（至少在 JVM 的 Windows 实现上）。所以无法删除。
It is good practice always to check if all opened streams get closed again after usage, because this is a bad memory-leak-situation. Your application can even eat up all available file-handles, that can lead to an unusable system.
最好总是检查所有打开的流在使用后是否再次关闭，因为这是一种糟糕的内存泄漏情况。您的应用程序甚至可以吃掉所有可用的文件句柄，这可能导致系统无法使用。
回答by Yoni Roit
There's a bugsaying that if the file is open by filewriter or anything, it won't be deleted. On windows. Check if you close your file writers.
有一个错误说如果文件被文件编写器或任何东西打开，它不会被删除。在窗户上。检查您是否关闭了文件编写器。
Another workaround would be installing a ShutdownHookwhich would manually delete the file.
另一种解决方法是安装ShutdownHook，它会手动删除文件。
回答by oxbow_lakes
You have to shut down a VM cleanlyin order for the deleteOnExitto work properly (I suspect). On UNIXa killwould be a clean shutdown (i.e. the ShutdownHookswould be processed) whereas a kill -9would be more like a force quit.
你必须关闭VM干净，以使deleteOnExit正常工作（我怀疑）。在UNIXakill上将是干净的关闭（ShutdownHooks即将被处理）而 akill -9将更像是强制退出。
deleteOnExitdefinitely works for me!
deleteOnExit绝对适合我！
回答by vineetawaw kkklll
Code to close the inpustream and outputstream:
关闭输入流和输出流的代码：
FileInputStream in = new FileInputStream();
ArrayList list_in = new ArrayList<FileInputStream>();
list_in.add(in);
FileOutputStream out = new FileOutputStream();
ArrayList list_out = new ArrayList<OutputputStream>();
list_in.add(out);
public do_before_exit()
{
for(int i=0;i<list_in.size();i++)
{
FileInputStream in=(FileInputStream)list_in.get(i)
FileInputStream out=(FileInputStream)list_out.get(i)
in.close()
out.close();
}
}
回答by Bhavesh Padharia
import java.io.File;
import java.io.IOException;
public class TemporaryFileExample
{
public static void main(String[] args)
{
File temp;
try
{
temp = File.createTempFile("myTempFile", ".txt");
System.out.println("Temp file created : " + temp.getAbsolutePath());
//temp.delete(); //For deleting immediately
temp.deleteOnExit(); //Delete on runtime exit
System.out.println("Temp file exists : " + temp.exists());
} catch (IOException e)
{
e.printStackTrace();
}
}
}
