java正则实现各种日期格式化
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package com.st.test;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.regex.Pattern;
public class DateFormatUtil {
@SuppressWarnings ( "finally" )
public static String FormatDate(String dateStr){
HashMap<String, String> dateRegFormat = new HashMap<String, String>();
dateRegFormat.put(
"^\\d{4}\\D+\\d{1,2}\\D+\\d{1,2}\\D+\\d{1,2}\\D+\\d{1,2}\\D+\\d{1,2}\\D*$" ,
"yyyy-MM-dd-HH-mm-ss" ); //2014年3月12日 13时5分34秒,2014-03-12 12:05:34,2014/3/12 12:5:34
dateRegFormat.put( "^\\d{4}\\D+\\d{2}\\D+\\d{2}\\D+\\d{2}\\D+\\d{2}$" ,
"yyyy-MM-dd-HH-mm" ); //2014-03-12 12:05
dateRegFormat.put( "^\\d{4}\\D+\\d{2}\\D+\\d{2}\\D+\\d{2}$" ,
"yyyy-MM-dd-HH" ); //2014-03-12 12
dateRegFormat.put( "^\\d{4}\\D+\\d{2}\\D+\\d{2}$" , "yyyy-MM-dd" ); //2014-03-12
dateRegFormat.put( "^\\d{4}\\D+\\d{2}$" , "yyyy-MM" ); //2014-03
dateRegFormat.put( "^\\d{4}$" , "yyyy" ); //2014
dateRegFormat.put( "^\\d{14}$" , "yyyyMMddHHmmss" ); //20140312120534
dateRegFormat.put( "^\\d{12}$" , "yyyyMMddHHmm" ); //201403121205
dateRegFormat.put( "^\\d{10}$" , "yyyyMMddHH" ); //2014031212
dateRegFormat.put( "^\\d{8}$" , "yyyyMMdd" ); //20140312
dateRegFormat.put( "^\\d{6}$" , "yyyyMM" ); //201403
dateRegFormat.put( "^\\d{2}\\s*:\\s*\\d{2}\\s*:\\s*\\d{2}$" ,
"yyyy-MM-dd-HH-mm-ss" ); //13:05:34 拼接当前日期
dateRegFormat.put( "^\\d{2}\\s*:\\s*\\d{2}$" , "yyyy-MM-dd-HH-mm" ); //13:05 拼接当前日期
dateRegFormat.put( "^\\d{2}\\D+\\d{1,2}\\D+\\d{1,2}$" , "yy-MM-dd" ); //14.10.18(年.月.日)
dateRegFormat.put( "^\\d{1,2}\\D+\\d{1,2}$" , "yyyy-dd-MM" ); //30.12(日.月) 拼接当前年份
dateRegFormat.put( "^\\d{1,2}\\D+\\d{1,2}\\D+\\d{4}$" , "dd-MM-yyyy" ); //12.21.2013(日.月.年)
String curDate = new SimpleDateFormat( "yyyy-MM-dd" ).format( new Date());
DateFormat formatter1 = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );
DateFormat formatter2;
String dateReplace;
String strSuccess= "" ;
try {
for (String key : dateRegFormat.keySet()) {
if (Pattern.compile(key).matcher(dateStr).matches()) {
formatter2 = new SimpleDateFormat(dateRegFormat.get(key));
if (key.equals( "^\\d{2}\\s*:\\s*\\d{2}\\s*:\\s*\\d{2}$" )
|| key.equals( "^\\d{2}\\s*:\\s*\\d{2}$" )) { //13:05:34 或 13:05 拼接当前日期
dateStr = curDate + "-" + dateStr;
} else if (key.equals( "^\\d{1,2}\\D+\\d{1,2}$" )) { //21.1 (日.月) 拼接当前年份
dateStr = curDate.substring( 0 , 4 ) + "-" + dateStr;
}
dateReplace = dateStr.replaceAll( "\\D+" , "-" );
// System.out.println(dateRegExpArr[i]);
strSuccess = formatter1.format(formatter2.parse(dateReplace));
break ;
}
}
} catch (Exception e) {
System.err.println( "-----------------日期格式无效:" +dateStr);
throw new Exception( "日期格式无效" );
} finally {
return strSuccess;
}
}
public static void main(String[] args) {
String[] dateStrArray= new String[]{
"2014-03-12 12:05:34" ,
"2014-03-12 12:05" ,
"2014-03-12 12" ,
"2014-03-12" ,
"2014-03" ,
"2014" ,
"20140312120534" ,
"2014/03/12 12:05:34" ,
"2014/3/12 12:5:34" ,
"2014年3月12日 13时5分34秒" ,
"201403121205" ,
"1234567890" ,
"20140312" ,
"201403" ,
"2000 13 33 13 13 13" ,
"30.12.2013" ,
"12.21.2013" ,
"21.1" ,
"13:05:34" ,
"12:05" ,
"14.1.8" ,
"14.10.18"
};
for ( int i= 0 ;i<dateStrArray.length;i++){
System.out.println(dateStrArray[i] + "------------------------------" .substring( 1 , 30 -dateStrArray[i].length())+ FormatDate(dateStrArray[i]));
}
}
}
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