从yyyy-MM-dd hh：mm：ss格式格式化日期 [英] Format date in yyyy-MM-dd hh:mm:ss format from whatever format

问题描述

我有各种日期字符串，并且想要使用java格式化为特定格式

I am having various date String and want to format in particular format using java

String arr[] = {"Jul 02,2020 ","15-10-2015 10:20:56","2015/10/26 12:10:39","27-04-2016 10:22:56","April 7, 2020"};
    Arrays.asList(arr).forEach(date->{
        try {
            System.out.println(convertDate(date, "yyyy-MM-dd hh:mm:ss"));
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    });

public static String getDateString(String date,String patternStr) throws ParseException {
    if(StringUtils.isNotEmpty(date)&& StringUtils.isNotEmpty(patternStr)) {
        SimpleDateFormat pattern = new SimpleDateFormat(patternStr);
        Date dateObject =new Date(date);
        return pattern.format(dateObject).toString();
    }
    return date;
}

但是我正在解析某些日期值的Exception。是否有任何通用的支持方式对于所有输入日期值。

But i am getting parse Exception for some of the date value.Is there any generic way to support for all the input date value .

推荐答案

我建议您从过时且容易出错的 java.util 日期时间API到丰富的现代日期时间API集。使用 DateTimeFormatterBuilder ，您可以构建一个格式，其中包括所有预期的日期时间格式以及时，分，秒，默认为 0

I recommend you switch from the outdated and error-prone java.util date-time API to the rich set of modern date-time API. Using DateTimeFormatterBuilder, you can build a format including all expected date-time formats and hour, minute, second defaulting to 0.

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;

public class Main {
    public static void main(final String[] args) {
        String arr[] = { "Jul 02,2020 ", "15-10-2015 10:20:56", "2015/10/26 12:10:39", "27-04-2016 10:22:56",
                "April 7, 2020" };
        DateTimeFormatter formatter = new DateTimeFormatterBuilder()
                                        .appendPattern("[MMM d,yyyy]")
                                        .appendPattern("[dd-MM-yyyy HH:mm:ss]")
                                        .appendPattern("[yyyy/MM/dd HH:mm:ss]")
                                        .appendPattern("[dd-MM-yyyy HH:mm:ss]")
                                        .appendPattern("[MMMM d, yyyy]")
                                        .parseDefaulting(ChronoField.HOUR_OF_DAY, 0)
                                        .parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0)
                                        .parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0)
                                        .toFormatter();

        for (String s : arr) {
            LocalDateTime ldt = LocalDateTime.parse(s.trim(), formatter);
            System.out.println("LocalDate#toString: " + ldt + ", " + "Formatted: "
                    + ldt.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        }
    }
}

输出：

LocalDate#toString: 2020-07-02T00:00, Formatted: 2020-07-02 00:00:00
LocalDate#toString: 2015-10-15T10:20:56, Formatted: 2015-10-15 10:20:56
LocalDate#toString: 2015-10-26T12:10:39, Formatted: 2015-10-26 12:10:39
LocalDate#toString: 2016-04-27T10:22:56, Formatted: 2016-04-27 10:22:56
LocalDate#toString: 2020-04-07T00:00, Formatted: 2020-04-07 00:00:00

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