字符串时间格式化

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

/**

* 日期格式化工具

* @author Administrator

*

*/

public class DateUtil {

public static Date format(String date) {

if(date.matches("[a-zA-Z]{3} [a-zA-Z]{3} \\d{1,2} \\d{1,2}:\\d{1,2}:\\d{2} CST \\d{4}")) {

SimpleDateFormat dateFormat = new SimpleDateFormat("EEE MMM d HH:mm:ss 'CST' yyyy", Locale.ENGLISH);

try {

return dateFormat.parse(date);

} catch (ParseException e) {

}

}else if(date.matches("[a-zA-Z]{3} \\d{2}, \\d{4} \\d{1,2}:\\d{1,2}:\\d{1,2} (AM)|(PM)")) {

SimpleDateFormat dateFormat = new SimpleDateFormat("MMM d, yyyy h:m:s aa", Locale.ENGLISH);

try {

return dateFormat.parse(date);

} catch (ParseException e) {

}

}

//日期提取

String datePattern = "\\d{4}[-/年]{1}\\d{1,2}[-/月]{1}\\d{1,2}日?";

Pattern pattern = Pattern.compile(datePattern);

Matcher matcher = pattern.matcher(date);

String datepart = "";

if(matcher.find()) {

String extractDate = matcher.group();

String[] ymd = extractDate.split("[-/年月日]");

int month = Integer.valueOf(ymd[1]);

int day = Integer.valueOf(ymd[2]);

if((month>0 && month<13)&&(day>0 && day<32)) {

extractDate = ymd[0]+"-"+String.format("%02d", Integer.valueOf(ymd[1]))+"-"+String.format("%02d", Integer.valueOf(ymd[2]));

datepart = extractDate;

}

}

//时间提取

datePattern = "\\d{1,2}[:：时]{1}\\d{1,2}[:：分]{1}\\d{1,2}秒?";

pattern = Pattern.compile(datePattern);

matcher = pattern.matcher(date);

String timepart = "00:00:00";

if(matcher.find()) {

String extractDate = matcher.group();

String[] ymd = extractDate.split("[:：时分秒]");

int hour = Integer.valueOf(ymd[0]);

int minute = Integer.valueOf(ymd[1]);

int second = Integer.valueOf(ymd[2]);

if((hour>-1&&hour<25)&&(minute>-1&&minute<60)&&(second>-1&&second<60)) {

extractDate = String.format("%02d", Integer.valueOf(ymd[0]))+":"+String.format("%02d", Integer.valueOf(ymd[1]))+":"+String.format("%02d", Integer.valueOf(ymd[2]));

timepart = extractDate;

}

}

boolean distinguishAMPM = false;

datePattern = "[amAM]{2}|[pmPM]{2}";

pattern = Pattern.compile(datePattern);

matcher = pattern.matcher(date);

if(matcher.find()) {

distinguishAMPM = true;

timepart += (" "+matcher.group());

}

if(StringUtils.isNotEmpty(datepart) && StringUtils.isNotEmpty(timepart)) {

String dateTime = datepart+" "+timepart;

SimpleDateFormat sdf = null;

String formarter = "";

if(distinguishAMPM) {

formarter = "yyyy-MM-dd hh:mm:ss a";

sdf = new SimpleDateFormat(formarter, Locale.ENGLISH);

}else {

formarter = "yyyy-MM-dd HH:mm:ss";

sdf = new SimpleDateFormat(formarter);

}

try {

return sdf.parse(dateTime);

} catch (ParseException e) {

}

}

return null;

}

public static void main(String[] args) {

System.out.println(format("2018/12/3 22时12分3秒"));

System.out.println(format("2018/2/30 22：2：30"));

System.out.println(format("2018/2/30 22:2:30"));

System.out.println(format("2018-2-30 22:2:30"));

System.out.println(format("2018年2月30日 22:2:30"));

System.out.println(format("2018/2/30干扰项22:2:30 am"));

}

}