blocks|key|4547802|text|从Java7开始，您可以使用deleteIfExists返回一个布尔值(或抛出异常)，这取决于文件是否被删除。对于其他文件系统操作，该方法可能不是原子的。此外，如果某个文件正在被JVM/其他程序使用，那么在某些操作系统上，它将无法删除该文件。每个文件都可以通过toPath方法转换为path。例如。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4547803|File+file+=+...;
boolean+result+=+Files.deleteIfExists(file.toPath());+//surround+it+in+try+catch+block|code-block|syntax|javascript|4547804|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#deleteIfExists%2528java.nio.file.Path%2529^0|3M|6|E|E|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

Starting from Java 7 you can use <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#deleteIfExists%28java.nio.file.Path%29" rel="noreferrer">deleteIfExists</a> that returns a boolean (or throw an Exception) depending on whether a file was deleted or not. This method may not be atomic with respect to other file system operations. Moreover if a file is in use by JVM/other program then on some operating system it will not be able to remove it. Every file can be converted to path via <code>toPath</code> method . E.g. 

<pre><code>File file = ...;
boolean result = Files.deleteIfExists(file.toPath()); //surround it in try catch block
</code></pre>

blocks|key|4547847|text|file.delete();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4547848|如果文件不存在，它将返回false。|unstyled|4547849|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>file.delete();
</code></pre>
if the file doesn't exist, it will return false.

blocks|key|4547835|text|还有Java+7解决方案，使用新的(Ish)路径抽象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4547836|Path+fileToDeletePath+=+Paths.get("fileToDelete_jdk7.txt");
Files.delete(fileToDeletePath);|code-block|syntax|javascript|4547837|希望这能有所帮助。|4547838|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

There's also the Java 7 solution, using the new(ish) Path abstraction: 

<pre><code>Path fileToDeletePath = Paths.get("fileToDelete_jdk7.txt");
Files.delete(fileToDeletePath);
</code></pre>

Hope this helps.

blocks|key|40942|text|我正在研究这种类型的函数，也许你们中的一些人会对这个遗嘱感兴趣...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|40943|public+boolean+deleteFile(File+file)+throws+IOException+{
++++if+(file+!=+null)+{
++++++++if+(file.isDirectory())+{
++++++++++++File[]+files+=+file.listFiles();

++++++++++++for+(File+f:+files)+{
++++++++++++++++deleteFile(f);
++++++++++++}
++++++++}
++++++++return+Files.deleteIfExists(file.toPath());
++++}
++++return+false;
}|code-block|syntax|javascript|40944|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I was working on this type of function, maybe this will interests some of you ...

<pre><code>public boolean deleteFile(File file) throws IOException {
 if (file != null) {
 if (file.isDirectory()) {
 File[] files = file.listFiles();

 for (File f: files) {
 deleteFile(f);
 }
 }
 return Files.deleteIfExists(file.toPath());
 }
 return false;
}
</code></pre>

blocks|key|4547906|text|如果您的项目中有一个名为uploads的目录中的文件。可以使用以下代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4547907|Path+root+=+Paths.get("uploads");
File+existingFile+=+new+File(this.root.resolve("img.png").toUri());

if+(existingFile.exists()+&&+existingFile.isFile())+{
+++++existingFile.delete();
+++}|code-block|syntax|javascript|4547908|或|4547909|如果它位于不同的目录中，则可以使用此解决方案。|4547910|File+existingFile+=+new+File("D:\\<path>\\img.png");

if+(existingFile.exists()+&&+existingFile.isFile())+{
++++existingFile.delete();
++}|4547911|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

if you have the file inside a dirrectory called uploads in your project. bellow code can be used.
<pre><code>Path root = Paths.get(&quot;uploads&quot;);
File existingFile = new File(this.root.resolve(&quot;img.png&quot;).toUri());

if (existingFile.exists() &amp;&amp; existingFile.isFile()) {
 existingFile.delete();
 }
</code></pre>
OR
If it is inside a different directory this solution can be used.
<pre><code>File existingFile = new File(&quot;D:\\&lt;path&gt;\\img.png&quot;);

if (existingFile.exists() &amp;&amp; existingFile.isFile()) {
 existingFile.delete();
 }
</code></pre>

blocks|key|4547964|text|通常我们创建File对象并检查File是否存在，然后删除。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4547965|File+f1+=+new+File("answer.txt");
if(f1.exists())+{+
++++f1.delete();
}|code-block|syntax|javascript|4547966|或|4547967|File+f2+=+new+File("answer.txt");
f2.deleteOnExit();|4547968|如果您正在使用Apache+Common，则可以使用以下选项来删除文件和目录|4547969|File+f3+=+new+File("answer.txt");
FileUtils.deleteDirectory(f3);|4547970|此方法在任何失败的情况下抛出异常。|4547971|4547972|+File+f4+=+new+File("answer.txt");
+FileUtils.deleteQuietly(f4);|4547973|此方法不会抛出任何异常。|4547974|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|11|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|13|8|@]|9|@]|A|$]]|$1|Q|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|R|3|S|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|T|3|U|5|6|7|16|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|W|$]]

Generally We create the File object and check if File Exist then delete.
<pre><code>File f1 = new File(&quot;answer.txt&quot;);
if(f1.exists()) { 
 f1.delete();
}
</code></pre>
OR
<pre><code>File f2 = new File(&quot;answer.txt&quot;);
f2.deleteOnExit();
</code></pre>
If you are uses the Apache Common then below are the option using which you can delete file and directory
<pre><code>File f3 = new File(&quot;answer.txt&quot;);
FileUtils.deleteDirectory(f3);
</code></pre>
This method throws the exception in case of any failure.
OR
<pre><code> File f4 = new File(&quot;answer.txt&quot;);
 FileUtils.deleteQuietly(f4);
</code></pre>
This method will not throw any exception.

blocks|key|4547854|text|这是我的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4547855|File+f+=+new+File("file.txt");
if(f.exists()+&&+!f.isDirectory())+{+
++++f.delete();
}|code-block|syntax|javascript|4547856|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is my solution:

<pre><code>File f = new File("file.txt");
if(f.exists() &amp;&amp; !f.isDirectory()) { 
 f.delete();
}
</code></pre>

blocks|key|40946|text|++File+xx+=+new+File("filename.txt");
++++if+(xx.exists())+{
+++++++System.gc();//Added+this+part
+++++++Thread.sleep(2000);////This+part+gives+the+Bufferedreaders+and+the+InputStreams+time+to+close+Completely
+++++++xx.delete();+++++
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|40947|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> File xx = new File("filename.txt");
 if (xx.exists()) {
 System.gc();//Added this part
 Thread.sleep(2000);////This part gives the Bufferedreaders and the InputStreams time to close Completely
 xx.delete(); 
 }
</code></pre>

We need to call <code>file.exists()</code> before <code>file.delete()</code> before we can delete a file E.g.

<pre><code> File file = ...;
 if (file.exists()){
 file.delete();
 } 
</code></pre>

Currently in all our project we create a static method in some util class to wrap this code. Is there some other way to achieve the same , so that we not need to copy our utils file in every other project.

Java better way to delete file if exists

文件系统

Java

在删除文件之前，我们需要在file.delete()之前调用file.exists()。 File file = ...; if (file.exists()){     file.delete(); }  目前，在我们所有的项目中，我们在一些util类中创建了一个静态方法来包装这些代码。有没有其他方法可以实现同样的目的，这样我们就不需要在每个其他项目中复制我们的utils文件。

问Java删除文件的更好方法(如果存在
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