java 如何使用 DateFormat 将 FileTime 转换为字符串
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How to Convert FileTime to String with DateFormat
提问by user2150250
I'm attempting to convert the creationTime attribute of a file to a string with a date format of MM/dd/yyyy. I am using Java nio to obtain the the creationTime attribute, which is of FileTimetype, but I just want the date from this FileTimeas a string with the date format specified previously. So far I have ...
我正在尝试将文件的 creationTime 属性转换为日期格式为 MM/dd/yyyy 的字符串。我正在使用 Java nio 来获取属于类型的 creationTime 属性，FileTime但我只希望此日期FileTime作为具有先前指定的日期格式的字符串。到目前为止我有...
String file = "C:\foobar\example.docx";
Path filepath = Paths.get(file);
BasicFileAttributes attr = Files.readAttributes(filepath,BasicFileAttributes.class);
FileTime date = attr.creationTime();
DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
String dateCreated = df.format(date);
However, it throws an exception saying it cannot format the FileTime dateobject as a Date. FileTime seems to output in form of 2015-01-30T17:30:57.081839Zfor example. What solution would you recommend to best solve this? Should I just use regex on that output or is there a more elegant solution?
但是，它抛出一个异常，说它不能将FileTime date对象格式化为日期。FileTime 似乎以2015-01-30T17:30:57.081839Z例如的形式输出。你会推荐什么解决方案来最好地解决这个问题？我应该在该输出上使用正则表达式还是有更优雅的解决方案？
采纳答案by Sotirios Delimanolis
Just get the milliseconds since epochfrom the FileTime.
刚拿到毫秒纪元以来从FileTime。
String dateCreated = df.format(date.toMillis());
// ^
回答by Selvaraj
Convert FileTime to millis by toMillis()method.
通过toMillis()方法将 FileTime 转换为毫秒。
String file = "C:\foobar\example.docx";
Path filepath = Paths.get(file);
BasicFileAttributes attr = Files.readAttributes(filepath, BasicFileAttributes.class);
FileTime date = attr.creationTime();
SimpleDateFormat df = new SimpleDateFormat("MM/dd/yyyy");
String dateCreated = df.format(date.toMillis());
System.out.println(dateCreated);
Use this code to get formatted value.
使用此代码获取格式化值。
回答by Mincong Huang
In Java 8, you can convert the FileTimeinto ZonedDateTimebefore formatting it:
在 Java 8 中，您可以在格式化之前将其转换FileTime为ZonedDateTime：
BasicFileAttributes attr = Files.readAttributes(path, BasicFileAttributes.class);
long cTime = attr.creationTime().toMillis();
ZonedDateTime t = Instant.ofEpochMilli(cTime).atZone(ZoneId.of("UTC"));
String dateCreated = DateTimeFormatter.ofPattern("MM/dd/yyyy").format(t);
System.out.println(dateCreated);
which prints:
打印：
06/05/2018
回答by adesh
Converting FileTime to Date
将文件时间转换为日期
Path path = Paths.get("C:\Logs\Application.evtx");
DateFormat df=new SimpleDateFormat("dd/MM/yy");
try {
BasicFileAttributes attr = Files.readAttributes(path, BasicFileAttributes.class);
Date d1 = df.parse(df.format(attr.creationTime().toMillis()));
System.out.println("File time : " +d1);
} catch (Exception e) {
System.out.println("oops error! " + e.getMessage());
}
use this code to convert
使用此代码进行转换
回答by chia yongkang
To summarise:
总结一下：
String file = "C:\foobar\example.docx";
Path filepath = Paths.get(file);
BasicFileAttributes attr = Files.readAttributes(filepath,BasicFileAttributes.class);
FileTime date = attr.creationTime();
DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
String dateCreated = df.format(date.toMillis());
