java's method of randomly generating time strings

This article is an example for you to share java random generation of time string specific code, for your reference, specific content is as follows

package com.wechat.utils; 
 
import java.text.SimpleDateFormat; 
import java.util.Date; 
 
/** 
 * Created by hexun on 2017/2/4. 
 */ 
public class RandTimeUtils { 
 
 
  /** 
   *  Generating random time  
   * @param beginDate 
   * @param endDate 
   * @return 
   */ 
  private static Date randomDate(String beginDate,String endDate ){ 
 
    try { 
 
      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); 
 
      Date start = format.parse(beginDate);// Construction start date  
 
      Date end = format.parse(endDate);// End date of construction  
 
      //getTime() Represents return from  1970  years  1  month  1  day  00:00:00 GMT  Since the  Date  The number of milliseconds the object represents.  
 
      if(start.getTime() >= end.getTime()){ 
 
        return null; 
 
      } 
 
      long date = random(start.getTime(),end.getTime()); 
 
      return new Date(date); 
 
    } catch (Exception e) { 
 
      e.printStackTrace(); 
 
    } 
 
    return null; 
 
  } 
 
  private static long random(long begin,long end){ 
 
    long rtn = begin + (long)(Math.random() * (end - begin)); 
 
    // If start and end times are returned, this function is recursively called to find random values  
 
    if(rtn == begin || rtn == end){ 
 
      return random(begin,end); 
 
    } 
 
    return rtn; 
 
  } 
 
  public static void main(String[] args){ 
    Date randomDate=randomDate("2010-09-20","2017-02-04"); 
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    String resulttime = format.format(randomDate);// Construction start date  
    System.out.println(resulttime); 
  } 
}