如何通过保留文件扩展名来重命名文件?
在我的情况下,我想在上传时重命名文件。我正在使用Apache commons fileupload库。
以下是我的代码段。
File uploadedFile = new File(path + "/" + fileName);
item.write(uploadedFile);
//renaming uploaded file with unique value.
String id = UUID.randomUUID().toString();
File newName = new File(path + "/" + id);
if(uploadedFile.renameTo(newName)) {
} else {
System.out.println("Error");
}
以上代码也在更改文件扩展名。我该如何保存它? apache commons文件上传库有什么好办法吗?
答案 0 :(得分:1)
尝试拆分并仅采用扩展程序的拆分:
String[] fileNameSplits = fileName.split("\\.");
// extension is assumed to be the last part
int extensionIndex = fileNameSplits.length - 1;
// add extension to id
File newName = new File(path + "/" + id + "." + fileNameSplits[extensionIndex]);
一个例子:
public static void main(String[] args){
String fileName = "filename.extension";
System.out.println("Old: " + fileName);
String id = "thisIsAnID";
String[] fileNameSplits = fileName.split("\\.");
// extension is assumed to be the last part
int extensionIndex = fileNameSplits.length - 1;
// add extension to id
System.out.println("New: " + id + "." + fileNameSplits[extensionIndex]);
}