如何在 Java 5 中从文本文件中读取时间和日期？
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How to Read Time and Date from Text File in Java 5?
提问by dvanaria
I'm trying to read data from a plain text file using Java 5 SE. The data is in the following formats:
我正在尝试使用 Java 5 SE 从纯文本文件中读取数据。数据采用以下格式：
10:48 AM
07/21/2011
I've looked into DateFormat and SimpleDateFormat, but I can't figure out the most straight-forward way of reading this data into a Date object.
我已经研究了 DateFormat 和 SimpleDateFormat，但我无法找出将这些数据读入 Date 对象的最直接方法。
Here's what I have so far:
这是我到目前为止所拥有的：
import java.io.File;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
class Pim {
File dataFile;
BufferedReader br;
String lineInput;
Date inputTime;
Date inputDate;
public Pim() {
dataFile = new File("C:\Data.txt");
try {
br = new BufferedReader(new FileReader(dataFile));
lineInput = br.readLine();
inputTime = new Date(lineInput);
lineInput = br.readLine();
inputDate = new Date(lineInput);
br.close();
} catch (IOException ioe) {
System.out.println("\n An error with the Data.txt file occured.");
}
}
}
Am I on the right track here? What's the best way to do this?
我在正确的轨道上吗？做到这一点的最佳方法是什么？
回答by Marsellus Wallace
First concat the two lines to have something like this: String date = "07/21/2011 10:48 AM"
首先将两行合并为如下内容： String date = "07/21/2011 10:48 AM"
DateFormat formatter = new SimpleDateFormat("MM/dd/yy h:mm a");
Date date = (Date)formatter.parse(date);
This should work, you can refer to SimpleDateFormat APIfor more options.
这应该有效，您可以参考SimpleDateFormat API以获取更多选项。
回答by Kumar Bibek
http://www.kodejava.org/examples/19.html
http://www.kodejava.org/examples/19.html
Change the SimpleDateFormat param as per your format.
根据您的格式更改 SimpleDateFormat 参数。
回答by Jonik
Using a library such as Guavainstead of writing your own file reading boilerplate code, you could get away with something like:
使用诸如Guava 之类的库而不是编写自己的文件读取样板代码，您可以使用以下内容：
List<String> lines =
Files.readLines(new File("C:\Data.txt"), Charset.forName("UTF-8"));
DateFormat timeFormat = new SimpleDateFormat("hh:mm a");
Date time = timeFormat.parse(lines.get(0));
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
Date date = dateFormat.parse(lines.get(1));
(Handling of IOException and ParseException omitted in above example.)
（上例中省略了 IOException 和 ParseException 的处理。）
回答by Shiva
Try this,
试试这个，
import java.util.Date;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class StringToDateDemo
{
public static void main(String[] args) throws ParseException
{
String strDate = "05/23/14 5:10 am";
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yy h:mm a");
Date dt = sdf.parse(strDate);
System.out.println(dt);
}
}
For more refer links below,
如需更多参考链接，请参阅以下链接，
https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html
https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html
