java无法删除另一个进程正在使用的文件 [英] java Cannot delete file, being used by another process

问题描述

我有这段代码

 import org.apache.commons.io.FileUtils;
    try {
        FileUtils.copyURLToFile(new URL(SHA1_LINK), new File("SHA1.txt"));
        if(!sameSha1()) {
            System.out.println("sha diferentes");
            FileUtils.copyURLToFile(new URL(LINK), new File(PROG));
        }
    } catch (Exception e) {
        System.out.println("Internet is off");
    }
    //delete SHA1 file
    Files.deleteIfExists(Paths.get("SHA1.txt"));

当我执行它时说

java.nio.file.FileSystemException

进程无法访问该文件，因为它正由另一个进程使用（在sun.nio.fs.WindowsException中）

java.nio.file.FileSystemException
The process cannot access the file because it is being used by another process (in sun.nio.fs.WindowsException)

在 sameSha1（）中我有：

String sha1Txt = new Scanner(new File("SHA1.txt")).useDelimiter("\\Z").next();

我想删除文件'SHA1.txt'。我怎么能这样做？

I want to delete the file 'SHA1.txt'. How can I do this?

推荐答案

我想用 sameSha1 你打开 SHA1.txt 阅读它而忘记关闭它。

I guess with sameSha1 you open SHA1.txt to read it and you forget to close it.

编辑：

在评论中，您在 sameSha1 中包含以下行：

From your comment you contain the following line in sameSha1:

String sha1Txt = new Scanner(new File("SHA1.txt")).useDelimiter("\\Z").next();

因此，您创建了扫描程序实例，但未明确关闭它。您应该这样做：

So you create a scanner instance but you don't explicitly close it. You should do something like that:

Scanner s = new Scanner(new File("SHA1.txt"));
try {
    String sha1Txt = s.useDelimiter("\\Z").next();
    ...
    return result;
}
finally {
    s.close();
}

或者@HuStmpHrrr在Java 7中建议：

Or as @HuStmpHrrr suggests in Java 7:

try(Scanner s = new Scanner(new File("SHA1.txt"))) {
    String sha1Txt = s.useDelimiter("\\Z").next();
    ...
    return result;
}

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