java针对于时间转换的DateUtils工具类

本文实例为大家分享了时间转换的dateutils工具类，供大家参考，具体内容如下

import java.sql.timestamp;
import java.text.simpledateformat;
import java.util.calendar;
import java.util.date;
import java.util.hashmap;
import java.util.map;
import net.sf.json.jsonobject;

/**
 * 时间日期工具类
 * 
 * @author wul
 * 2015-12-31
 */
public class dateutil {

  public static final string date_normal_format = "yyyy-mm-dd"; 
  public static final string datetime_normal_format = "yyyy-mm-dd hh:mm:ss"; 
  public static final string date_compact_format = "yyyymmdd"; 
  public static final string datetime_compact_format = "yyyymmddhhmmss"; 
  public static final string ym_normal_format = "yyyy-mm"; 
  public static final string ym_compact_format = "yyyymm"; 

  /**
   * string转timestamp
   * @param datestr
   * @return
   * @author wul
   * 2016-1-17
   */
  public static timestamp stringtotimestamp(string datestr) {
    try { 
      if(datestr.length() <= 10) {
        datestr += " 00:00:00";
      }
      return timestamp.valueof(datestr); 
    } catch (exception e) { 
      e.printstacktrace(); 
      return null;
    } 
  }

  /**
   * string转date
   * @param datestr
   * @param format
   * @return
   * @author wul
   * 2016-1-17
   */
  public static date stringtodate(string datestr, string format) {
    if(datestr == null || "".equals(datestr)){
      return null;
    }
    date date = null; 
    //注意format的格式要与日期string的格式相匹配 
    simpledateformat sdf = new simpledateformat(format); 
    try { 
      date = sdf.parse(datestr); 
    } catch (exception e) { 
      e.printstacktrace(); 
    } 
    return date;
  }

  /**
   * date转string
   * @param date
   * @param format
   * @return
   * @author wul
   * 2016-1-17
   */
  public static string datetostring(date date, string format) {
    simpledateformat sdf = new simpledateformat(format);
    string currentdate = sdf.format(date);
    return currentdate;
  }

  /**
   * date转timestamp
   * @param date
   * @return
   * @author wul
   * 2016-1-17
   */
  public static timestamp datetotimestamp(date date) {
    timestamp ts = new timestamp(date.gettime());
    return ts;
  }

  /**
   * timestamp转string
   * @param ts
   * @return
   * @author wul
   * 2016-1-17
   */
  public static string timestamptostring(timestamp ts) {
    string tsstr = null; 
    simpledateformat sdf = new simpledateformat(datetime_normal_format); 
    try { 
      tsstr = sdf.format(ts); 
    } catch (exception e) { 
      e.printstacktrace(); 
    } 
    return tsstr;
  }

  /**
   * timestamp转date
   * @param ts
   * @return
   * @author wul
   * 2016-1-17
   */
  public static date timestamptodate(timestamp ts) {
    return ts;
  }

  /**
   * 获得当前时间并格式化：yyyy-mm-dd hh:mm:ss
   * @return
   */
  public static string getcurrenttimenormal() {

    simpledateformat sdf = new simpledateformat(datetime_normal_format);
    string currentdate = sdf.format(new date());
    return currentdate;
  }
  /**
   * 获得当前时间并格式化：yyyymmddhhmmss
   * @return
   */
  public static string getcurrenttimecompact() {

    simpledateformat sdf = new simpledateformat(datetime_compact_format);
    string currentdate = sdf.format(new date());
    return currentdate;
  }

  /**
   * 获得当前时间并格式化：yyyy-mm-dd
   * @return
   */
  public static string getcurrentdatenormal() {

    simpledateformat sdf = new simpledateformat(date_normal_format);
    string currentdate = sdf.format(new date());
    return currentdate;
  }

  /**
   * 获得当前时间并格式化：yyyymmdd
   * @return
   */
  public static string getcurrentdatecompact() {

    simpledateformat sdf = new simpledateformat(date_compact_format);
    string currentdate = sdf.format(new date());
    return currentdate;
  }

  /**
   * 将20101202时间格式化为2010-12-02
   * 
   * @param datestring 时间格式:yyyymmdd
   * @return
   */
  public static string getdatecompacttonormal(string datestring){

    stringbuilder sb = new stringbuilder();
    sb.append(datestring.substring(0,4)).append("-").append(datestring.subsequence(4, 6)).append("-").append(datestring.substring(6, 8));
    return sb.tostring();
  }

  /**
   * 将20101202101423时间格式化为2010-12-02 10:14:23
   * 
   * @param datestring 时间格式:yyyymmddhhmmss
   * @return
   */
  public static string getdatetimecompacttonormal(string datestring){

    stringbuilder sb = new stringbuilder();
    sb.append(datestring.substring(0,4)).append("-").append(datestring.subsequence(4, 6)).append("-").append(datestring.substring(6, 8))
        .append(" ").append(datestring.substring(8, 10)).append(":").append(datestring.substring(10, 12)).append(":").append(datestring.substring(12));
    return sb.tostring();
  }

  /**
   * 把界面输入的时间转为间凑的时间字符串
   * 将2010-12-02 10:14:23时间格式化为20101202101423
   * @param datenormalstr string
   * @return string
   */
  public static string getcompactstring(string datenormalstr) {
    stringbuffer ret = new stringbuffer();
    try {
      ret.append(datenormalstr.substring(0, 4));
      ret.append(datenormalstr.substring(5, 7));
      ret.append(datenormalstr.substring(8, 10));
      ret.append(datenormalstr.substring(11, 13));
      ret.append(datenormalstr.substring(14, 16));
      ret.append(datenormalstr.substring(17, 19));
    } catch (exception ex) {
      // 如果字串不够长度，则返回前面的部分
    }
    return ret.tostring();
  }
  /**
   * 将20101202(101423)时间格式 获得年份
   * @param datestring  时间格式:yyyymmdd(hhmmss)
   * @return
   */
  public static string getyear(string datestring){

    return datestring.substring(0,4);
  }

  /**
   * 将20101202(101423)时间格式 获得月份
   * @param datestring  时间格式:yyyymmdd(hhmmss)
   * @return
   */
  public static string getmonth(string datestring){

    return datestring.substring(4,6);
  }

  /**
   * 将20101202时间格式 获得日期
   * @param datestring  时间格式:yyyymmdd
   * @return
   */
  public static string getdaynotime(string datestring){
    return datestring.substring(6);
  }

  /**
  * 获取当前日期之前的日期，按天数向前推
  * @param numval
  * @param dateformat
  * @return
  * @author wul
  * 2016-1-17
  */
  public static string getbeforedateplusday(int numval, string dateformat) {
    calendar calendar = calendar.getinstance();
    long currenttimemillis = calendar.gettimeinmillis();

    long hourinmillis = 60 * 60 * 1000;
    long dval = numval * 24 * hourinmillis;

    simpledateformat sdf = new simpledateformat(dateformat);
    string currentdate = sdf.format(currenttimemillis - dval);
    return currentdate;
  }

  /**
   * 获取当前日期之前的日期，按天数向前推
   * @param numval
   * @param dateformat
   * @return
   * @author wul
   * 2016-1-17
   */
  public static string getafterdateplusday(int numval, string dateformat) {
    calendar calendar = calendar.getinstance();
    long currenttimemillis = calendar.gettimeinmillis();

    long hourinmillis = 60 * 60 * 1000;
    long dval = numval * 24 * hourinmillis;

    simpledateformat sdf = new simpledateformat(dateformat);
    string currentdate = sdf.format(currenttimemillis + dval);
    return currentdate;
  }

  /**
   * 获取当前日期之前的日期，按小时向前推
   * @param numval
   * @param dateformat
   * @return
   * @author wul
   * 2016-1-17
   */
  public static string getbeforedateplushour(int numval, string dateformat) {
    calendar calendar = calendar.getinstance();
    long currenttimemillis = calendar.gettimeinmillis();

    long hourinmillis = 60 * 60 * 1000;
    long dval = numval * hourinmillis;

    simpledateformat sdf = new simpledateformat(dateformat);
    string currentdate = sdf.format(currenttimemillis - dval);
    return currentdate;
  }

  /**
   * 获取当前日期之前的日期，按小时向前推
   * @param numval
   * @param dateformat
   * @return
   * @author wul
   * 2016-1-17
   */
  public static string getafterdateplushour(int numval, string dateformat) {
    calendar calendar = calendar.getinstance();
    long currenttimemillis = calendar.gettimeinmillis();

    long hourinmillis = 60 * 60 * 1000;
    long dval = numval * hourinmillis;

    simpledateformat sdf = new simpledateformat(dateformat);
    string currentdate = sdf.format(currenttimemillis + dval);
    return currentdate;
  }

  /**
   * 两个日期相差天数
   * @param begindate
   * @param enddate
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int daysbetween(date begindate, date enddate) {
    calendar cal = calendar.getinstance();
    cal.settime(begindate);
    long time1 = cal.gettimeinmillis();
    cal.settime(enddate);
    long time2 = cal.gettimeinmillis();
    long between_days = (time2 - time1) / (1000 * 3600 * 24);
    return integer.parseint(string.valueof(between_days));
  }

  /**
   * 获取某月天数
   * @param year
   * @param month
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getmonthdays(int year, int month) {
    calendar cal = calendar.getinstance();
    cal.set(calendar.year, year);
    cal.set(calendar.month, month - 1);
    return cal.getactualmaximum(calendar.date);
  }

  /**
   * 给时间加减年份
   * @param date
   * @param plustime
   * @return
   * @author wul
   * 2016-1-18
   */
  public static date getdateplusyear(date date, int plustime) {
    calendar cal = calendar.getinstance();
    cal.settime(date);
    cal.add(calendar.year, plustime);
    date d = cal.gettime();
    return d;
  }

  /**
   * 给时间加减月份
   * @param date
   * @param plustime
   * @return
   * @author wul
   * 2016-1-18
   */
  public static date getdateplusmonth(date date, int plustime) {
    calendar cal = calendar.getinstance();
    cal.settime(date);
    cal.add(calendar.month, plustime);
    date d = cal.gettime();
    return d;
  }

  /**
   * 给时间加减天数
   * @param date
   * @param plustime
   * @return
   * @author wul
   * 2016-1-18
   */
  public static date getdateplusday(date date, int plustime) {
    calendar cal = calendar.getinstance();
    cal.settime(date);
    cal.add(calendar.date, plustime);
    date d = cal.gettime();
    return d;
  }

  /**
   * 给时间加减小时
   * @param date
   * @param plustime
   * @return
   * @author wul
   * 2016-1-18
   */
  public static date getdateplushour(date date, int plustime) {
    calendar cal = calendar.getinstance();
    cal.settime(date);
    cal.add(calendar.hour, plustime);
    date d = cal.gettime();
    return d;
  }

  /**
   * 给时间加减分钟
   * @param date
   * @param plustime
   * @return
   * @author wul
   * 2016-1-18
   */
  public static date getdateplusminute(date date, int plustime) {
    calendar cal = calendar.getinstance();
    cal.settime(date);
    cal.add(calendar.minute, plustime);
    date d = cal.gettime();
    return d;
  }

  /**
   * 给时间加减秒
   * @param date
   * @param plustime
   * @return
   * @author wul
   * 2016-1-18
   */
  public static date getdateplussecond(date date, int plustime) {
    calendar cal = calendar.getinstance();
    cal.settime(date);
    cal.add(calendar.second, plustime);
    date d = cal.gettime();
    return d;
  }

  /**
   * 返回当前年
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getcurrentyear() {
    calendar calendar = calendar.getinstance();
    return calendar.get(1);
  }

  /**
   * 返回当前月
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getcurrentmonth() {
    calendar calendar = calendar.getinstance();
    return calendar.get(2) + 1;
  }

  /**
   * 返回当前天
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getcurrentday() {
    calendar calendar = calendar.getinstance();
    return calendar.get(5);
  }

  /**
   * 返回当前小时
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getcurrenthour() {
    calendar calendar = calendar.getinstance();
    return calendar.get(11);
  }

  /**
   * 返回当前分钟
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getcurrentminute() {
    calendar calendar = calendar.getinstance();
    return calendar.get(12);
  }

  /**
   * 返回当前秒
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getcurrentsecond() {
    calendar calendar = calendar.getinstance();
    return calendar.get(13);
  }

  /**
   * 返回当前年
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getyear(date date) {
    calendar calendar = calendar.getinstance();
    calendar.settime(date);
    return calendar.get(1);
  }

  /**
   * 返回当前月
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getmonth(date date) {
    calendar calendar = calendar.getinstance();
    calendar.settime(date);
    return calendar.get(2) + 1;
  }

  /**
   * 返回当前天
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getday(date date) {
    calendar calendar = calendar.getinstance();
    calendar.settime(date);
    return calendar.get(5);
  }

  /**
   * 返回当前小时
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int gethour(date date) {
    calendar calendar = calendar.getinstance();
    calendar.settime(date);
    return calendar.get(11);
  }

  /**
   * 返回当前分钟
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getminute(date date) {
    calendar calendar = calendar.getinstance();
    calendar.settime(date);
    return calendar.get(12);
  }

  /**
   * 返回当前秒
   * @return
   * @author wul
   * 2016-1-18
   */
  public static int getsecond(date date) {
    calendar calendar = calendar.getinstance();
    calendar.settime(date);
    return calendar.get(13);
  }

  public static void main(string[] args) {
    system.out.println(dateutil.datetostring(new java.sql.date(system.currenttimemillis()), dateutil.date_normal_format));
    map<string,object> map = new hashmap<string,object>();
    map.put("date", new date());
    string json = jsonobject.fromobject(map).tostring();
    system.out.println(json);
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。