What are the methods to convert string to date in java

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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