在Java中重命名文件

Question

File file= new File("C:\\Documents and Settings\\Administrator\\Desktop\\ajay\\abc.csv");
Timestamp ts=new Timestamp(new Date().getTime());
String str= ts.toString();
String st="C:\\Documents and Settings\\Administrator\\Desktop\\ajay\\abc\\"+str+".csv";
System.out.println(new Date().getTime());
boolean b=file.renameTo(new File(st));
System.out.println(b);

In this code snippet I try to rename the file but I'm unable to find the error in it.

Answer 1

Won't getTime().toString() return a string with colons in it? That would be illegal in a filename.

Answer 2

you can remove colon from String for example with this method :

      String time = "12:12:12";
      String time2 = time.replace(":", "");

output be : 121212

Answer 3

I would use something like

final File file= new File("C:\\Documents and Settings\\Administrator\\Desktop\\ajay\\abc.csv");
final Calendar cal = Calendar.getInstance();
cal.setTime(new Date());
final StringBuilder str = new StringBuilder();
str.append(cal.get(Calendar.YEAR));
str.append(cal.get(Calendar.MONTH));
str.append(cal.get(Calendar.DATE));
final String st="C:\\Documents and Settings\\Administrator\\Desktop\\ajay\\abc"+str+".csv";
System.out.println(new Date().getTime());
final boolean b = file.renameTo(new File(st));
System.out.println(b);