Conversion method: 1. Use SimpleDateFormat to format time; 2. Use "org.apache.commons.lang3.time.DateUtils" to format time; 3. Use DateTimeFormatter to format time.
The operating environment of this tutorial: windows7 system, java8 version, DELL G3 computer.
There are three common ways to convert String to Date: SimpleDateFormat, org.apache.commons.lang3.time.DateUtils, DateTimeFormatter (Java 8)
| Description | |
|---|---|
| SimpleDateFormat | Thread-unsafe, flexible text matching |
DateUtils |
Tool class, supports date operations |
| DateTimeFormatter | Thread safety, supports chain programming with LocalDateTime, Convenient comparison operations |
The following is the sample code
/** * 指定当前时间-指定时间是否大于30秒 */ //SimpleDateFormat private static void m1() throws ParseException { String endTime = "哈哈2020-02-07 18:58:02.0你好";//支持特殊格式转换 String format = "哈哈yyyy-MM-dd HH:mm:ss"; SimpleDateFormat sdf = new SimpleDateFormat(format); Date edate = sdf.parse(endTime); Date now = new Date(); String nowStr = DateFormatUtils.format(now, format); if(DateUtils.addSeconds(edate, 30).before((now))){ logger.info("true endTime={} now={}",endTime, nowStr); }else{ logger.info("false endTime={} now={}",endTime, nowStr); } } //DateUtils private static void m3() throws ParseException { String endTime = "2020-02-07 18:58:02.0"; String format = "yyyy-MM-dd HH:mm:ss"; Date edate = DateUtils.parseDate(endTime, format, "yyyy-MM-dd HH:mm:ss.SSS");//支持多格式匹配 Date now = new Date(); String nowStr = DateFormatUtils.format(now, format); if(DateUtils.addSeconds(edate, 30).before((now))){ logger.info("true endTime={} now={}",endTime, nowStr); }else{ logger.info("false endTime={} now={}",endTime, nowStr); } } //DateTimeFormatter private static void m2(){ String endTime = "2020-02-07 18:58:02"; String format = "yyyy-MM-dd HH:mm:ss"; LocalDateTime now = LocalDateTime.now(); DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format); String nowStr = now.format(dateTimeFormatter); if(LocalDateTime.parse(endTime, dateTimeFormatter) .plusSeconds(30).isBefore(LocalDateTime.now())){//链式编程 logger.info("true endTime={} now={}",endTime, nowStr); }else{ logger.info("false endTime={} now={}",endTime, nowStr); } }
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