英文:
Deleting a file with the same name only if the new version can be saved
问题
我的当前情况是：
我有一个 test.txt 文件，在一段时间间隔后，我想使用相同的名称保存一个更新版本的 test.txt，因为在我的应用程序中，我正在使用 test.txt 名称来读取文件。
我发现使用下面的代码，如果 test.txt 文件已经存在，它基本上会覆盖 test.txt 文件。
new FileWriter("test.txt", false);
我对使用这段代码的主要担忧是，new FileWriter 可能会抛出错误（IOException 和 FileNotFound）。如果无法保存新版本的 test.txt，我不希望它删除旧的 test.txt。
是否有一种方法/选项可以保证只有在能够创建/保存新版本时才删除旧版本的 test.txt？
我不希望陷入旧版本被删除而新版本无法保存的情况。
英文:
My current situation is:
I have test.txt and after an interval i want to save a newer version of test.txt using the same name, because in my application i am using the test.txt name to read the file.
I found that using the code below basically overrides the test.txt file if it already exists.
new FileWriter("test.txt", false);
My main concern using this code is that new FileWriter can throw errors (IOException and FileNotFound). I don't want it to delete the old test.txt if it's not possible to save the new version of test.txt.
Is there a way/option to guarantee that the old version of test.txt gets deleted only if the new version can get created/saved?
I don't want to get stuck in the situation where the old version gets deleted and the new version can't be saved.
答案1
得分: 1
你可以尝试将你的数据写入一个新的临时文件，如果写入完成，就删除test.txt，然后将临时文件重命名为test.txt。
英文:
You could try to write your data to a new temp file and if that is finished delete test.txt and rename the temp file to test.txt.
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