不规则时间字符串处理（Java）

来源：互联网发布：道路车流量预测软件编辑：程序博客网时间：2024/06/05 08:44

最近从MongoDB中读取时间字符串。由于写入字符串时没有处理，该字符串显示的时间格式很不规律，如“2017-04-14 11:05”,“2017年11月14 11:05”,“2017-11-14日11:05”，“20170414”等。

我听说PHP有个函数可以把各种时间格式的字符串转成linux时间戳。不过Java我不知道有没有这样的函数，所以自己按规则写了一个。先转成时间戳，在转回规定格式。

代码很丑，不优雅，以后想起了再琢磨一下写成工具类。现在先记下来方便用。

package Test;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.Locale;import java.util.Vector;public class Test{    public static void main(String[] args) {        String term = "20170414";        System.out.println(getTime(term));    }    public static String getTime(String givingTime){        SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",Locale.ENGLISH);        givingTime = givingTime.replaceAll("([^0-9] )|([^0-9])"," ");        givingTime = givingTime.replaceAll("\\s{1,}", " ");        String[] numbers = givingTime.split(" ");        if (numbers.length == 1){            String time = numbers[0];            SimpleDateFormat format;            if (time.length() == 8)                format = new SimpleDateFormat("yyyyMMdd",Locale.ENGLISH);            else if (time.length() == 14)                format = new SimpleDateFormat("yyyyMMddHHmmss",Locale.ENGLISH);            else if (time.length() > 8){                time = time.substring(0, 8);                format = new SimpleDateFormat("yyyyMMdd",Locale.ENGLISH);            }            else{                format = null;                return sdf.format(new Date(0));            }            Date date = null;            try {                date = format.parse(time);            } catch (ParseException e) {                e.printStackTrace();            }            return sdf.format(date);        }        Vector<Integer> nums = new Vector<Integer>();        for (int i = 0; i < 6; i++)            nums.add(0);        if (numbers.length > 3){            if(Integer.parseInt(numbers[2]) > 31){                String tmp = numbers[2].substring(0, 2);                if (Integer.parseInt(tmp) > 31)                    tmp = numbers[2].substring(0, 1);                numbers[3] = numbers[2].substring(tmp.length());                numbers[2] = tmp;            }        }        for (int i = 0; i < numbers.length; i++){            nums.setElementAt(Integer.parseInt(numbers[i]), i);            System.out.println("i = " + i + ": nums = " + nums.get(i));        }        int year = nums.get(0);        int month = nums.get(1);        int day = nums.get(2);        int hour = nums.get(3);        if (hour > 24) hour = 0;        int min = nums.get(4);        if (min > 60) min = 0;        int sec = nums.get(5);        if (sec > 60) sec = 0;        Calendar calendar = Calendar.getInstance();        System.out.println(year+ " " + (month-1)+ " " + day+ " " + hour+ " " + min+ " " + sec);        calendar.set(year, month-1, day, hour, min, sec);        return sdf.format(calendar.getTime());    }}

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