使用 Java 删除所有带有扩展名的文件
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Delete all files with an extension using Java
提问by tucuxi
I'm (relatively) new to Java and I'm trying to implement a .jar that runs a list of commands that in Windows XP's command prompt it would be:
我（相对）是 Java 新手，我正在尝试实现一个 .jar 文件，该文件运行一系列命令，在 Windows XP 的命令提示符下，它将是：
cd\
cd myfolder
del *.lck /s
My (failed) attempt:
我的（失败）尝试：
// Lists all files in folder
File folder = new File(dir);
File fList[] = folder.listFiles();
// Searchs .lck
for (int i = 0; i < fList.length; i++) {
String pes = fList.get(i);
if (pes.contains(".lck") == true) {
// and deletes
boolean success = (new File(fList.get(i)).delete());
}
}
I screwed somewhere around that "get(i)", but I think I'm pretty close to my goal now.
我在某个地方搞砸了“get(i)”，但我认为我现在已经很接近我的目标了。
I ask for your help and thank you very much in advance!
我请求您的帮助，并在此先感谢您！
EDIT
编辑
Alright! Many thanks, everybody. With the 3 suggested modifications I ended up with:
好吧！非常感谢大家。通过 3 个建议的修改，我最终得到了：
// Lists all files in folder
File folder = new File(dir);
File fList[] = folder.listFiles();
// Searchs .lck
for (int i = 0; i < fList.length; i++) {
String pes = fList[i];
if (pes.endsWith(".lck")) {
// and deletes
boolean success = (new File(fList[i]).delete());
}
}
And now it works!
现在它起作用了！
采纳答案by Rohit Jain
fList.get(i)should be fList[i]as fListis an array, and it returns a Filereference not a String.
fList.get(i)应fList[i]作为fList是一个数组，并且它返回一个File参考不是一个String。
Change: -
改变： -
String pes = fList.get(i);
to: -
到： -
File pes = fList[i];
And then change if (pes.contains(".lck") == true)to if (pes.getName().contains(".lck"))
然后if (pes.contains(".lck") == true)改为if (pes.getName().contains(".lck"))
In fact, since you are checking for the extension, you should use endsWithmethod rather than containsmethod. And yes, you don't need to compare your booleanvalue with ==. So just use this condition: -
事实上，由于您正在检查extension，您应该使用endsWith方法而不是contains方法。是的，您不需要将您的boolean价值与==. 所以只需使用这个条件： -
if (pes.getName().endsWith(".lck")) {
boolean success = (new File(fList.get(i)).delete());
}
回答by tucuxi
for (File f : folder.listFiles()) {
if (f.getName().endsWith(".lck")) {
f.delete(); // may fail mysteriously - returns boolean you may want to check
}
}
回答by Johnny Willer
Java 8 approach
Java 8 方法
Arrays.stream(yourDir.listFiles((f, p) -> p.endsWith("YOUR_FILE_EXTENSION"))).forEach(File::delete);
回答by Yasmeen Azhar
Final Code which works :)
最终代码有效:)
File folder = new File(dir);
File fList[] = folder.listFiles();
for (File f : fList) {
if (f.getName().endsWith(".png")) {
f.delete();
}}
回答by Yogendra Singh
You are using Collectionmethod geton an Array. Use Array Indexnotation as below:
您正在使用Collection的方法get上Array。使用Array Index符号如下：
File pes = fList[i];
Also better to use endsWith()String method over the file name as:
最好 在文件名上使用endsWith()String 方法：
if (pes.getName().endsWith(".lck")){
...
}
