String类型时间的获取与处理

package com.base.utils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtils {

//   public static String nowDate(){
//       Calendar now = Calendar.getInstance();
//       return null;
//   }
   /**
   * 比较两个日期的大小
   * @author Chao
   * format 时间格式 "yyyy-MM" "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
   * 返回 i 1-time1大于time2 -1-time2大于time1 0-相等
   */
   public static int complateTime(String time1,String time2,String format) {
       int i = 100 ;
       DateFormat df = new SimpleDateFormat(format);
//获取Calendar实例
Calendar currentTime = Calendar.getInstance();
Calendar compareTime = Calendar.getInstance();
try {
//把字符串转成日期类型
currentTime.setTime(df.parse(time1));
compareTime.setTime(df.parse(time2));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//利用Calendar的方法比较大小
if (currentTime.compareTo(compareTime) > 0) {
return 1;
}else if(currentTime.compareTo(compareTime) < 0){
   return -1;
}else if(currentTime.compareTo(compareTime) == 0) {
   return 0;
}
       return i;
   }
   /**
   * 计算日期几天前或者几天后时间
   * @param time 传入的时间
   * @param state 1-加年 2-加月 3-加日
   * @param day 增加或者减少的数值
   * @param format 日期格式
   * @return 计算后的时间 "yyyy-MM-dd" "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
   * @throws ParseException
   */
   public static String getDate(String time,int state,int day,String format) throws ParseException{
       String d = time;
       DateFormat df = new SimpleDateFormat(format);/*** 加一天*/
           Date dd = df.parse(d);
       Calendar calendar = Calendar.getInstance();
       calendar.setTime(dd);
       if(state==3){
           calendar.add(Calendar.DATE, day);
       }
       if(state==2){
           calendar.add(Calendar.MONTH, day);
       }
       if(state==1){
           calendar.add(Calendar.YEAR, day);
       }
       SimpleDateFormat sdf = new SimpleDateFormat(format);
       String dateStr = sdf.format(calendar.getTime());
       return dateStr;
   }
   /**
   * 通过设置时间格式获取当前时间
   * @param 时间格式 "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
   * @return string
   */
   public static String getCurrentTime(String format){
       SimpleDateFormat sdf = new SimpleDateFormat(format);
   Date date = new Date();
   String formatDate = sdf.format(date);
   return formatDate;
   }

/**
* 字符串时间转时间类型固定日期格式
* @param text 字符串时间，format "yyyy-MM-dd HH:mm:ss"
* @return Date
* @throws Exception
*/
public static Date getStringToDate(String time,String format) throws Exception{
SimpleDateFormat sdf = new SimpleDateFormat(format);//格式时间对象
Date date = sdf.parse(time);
return date;
}
/**
* 获取时间戳
* @param time
* @param format
* @return
* @throws Exception
*/
public static long getTimeStampByTime(String time,String format) throws Exception{
       return getStringToDate(time,format).getTime();
}
/**
* 时间String转Date
* @param strDate
* @return
*/
public static Date strToDateLong(String strDate) {
   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   ParsePosition pos = new ParsePosition(0);
   Date strtodate = formatter.parse(strDate, pos);
   return strtodate;
}
/**
* 获取两个时间的间隔秒数
* @param time1
* @param time2
* @param format
* @return
* @throws ParseException
*/
public static long getDiffTime(String time1,String time2,String format) throws ParseException{
   SimpleDateFormat dfs = new SimpleDateFormat(format);
   Date begin=dfs.parse(time1);
   Date end = dfs.parse(time2);

   long between=(end.getTime()-begin.getTime())/1000;//除以1000是为了转换成秒
//     long min=between/60;
   return between;
}



   public static void main(String[] args) throws ParseException {

       String aString = nowTime("yyyy-MM-dd HH:mm:ss");
       String test1 = "00:00:01";
       String test2 = "11:11:12";
       try {
           System.out.println(getTimeStampByTime(test1,"HH:mm:ss"));
           System.out.println(getTimeStampByTime(test2,"HH:mm:ss"));

       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }


   }
}

String类型时间的获取与处理

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