java如何获取当天的上一个月

可以通过GregorianCalendar 函数来实现日期定义获取到本月的下一个月，通过”calendaradd(CalendarMONTH, -2)“获取上个月的信息（上月和下个月是差2）

GregorianCalendar calendar = new GregorianCalendar(2015, 6, 28);//灵活的输入年份，月份，日期，

      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");//定义日期显示格式

      Systemoutprintln(sdfformat(calendargetTime()));//打印当前月份的下一个月份

      for (int i = 0; i < 1; i++) {

          calendaradd(CalendarMONTH, -2);//获取上个月月份

          Systemoutprintln(sdfformat(calendargetTime()));//输出结果

      }

结果：

//将yyyyMMdd转为date

public static Date getCoreToEmsDateStr(String dateStr){

DateFormat format = new SimpleDateFormat("yyyyMMdd");

Date d = null;

try{

d = formatparse(dateStr);

}catch(ParseException e){

eprintStackTrace();

}

return d;

}

public static String getDateAfterDays(Timestamp s,int days){

Timestamp currTimestamp = s;

for (int i=0;i<days;i++){

currTimestamp = getNextDate(currTimestamp);

}

return getDateTimeStr(currTimestamp,"3");

}

public static Timestamp getNextDate(javasqlTimestamp tsDate){

if(tsDate==null)

return null;

javautilCalendar calendar = CalendargetInstance();

calendarsetTime(tsDate);

return getDateTime(calendarget(CalendarYEAR),calendarget(CalendarMONTH)+1,calendarget(CalendarDATE)+1,

calendarget(CalendarHOUR_OF_DAY),calendarget(CalendarMINUTE),calendarget(CalendarSECOND));

}

public static javasqlTimestamp getDateTime(int year,int month,int day,int hour,int minute,int second){

javasqlTimestamp ts = null;

javautilDate dt = null;

javautilCalendar calendar = CalendargetInstance();

calendarclear();

calendarset(year,month-1,day,hour,minute,second);

dt = calendargetTime();

ts = new javasqlTimestamp(dtgetTime());

return ts;

}

/

比较两个时间是否相同

@param tsBeginDate

@param tsEndDate

@param bool

@return

/

public static long getDateInterval(Timestamp tsBeginDate,Timestamp tsEndDate,boolean bool){

long lDays = 0;

if(bool){

tsBeginDate = CommongetDateTime(CommongetDateString(tsBeginDate),bool);

}

if(tsBeginDate!=null&&tsEndDate!=null){

Log4jinfo("tsEndDategetTime ()===="+tsEndDate);

Log4jinfo("tsBeginDategetTime ()===="+tsBeginDate);

lDays = (tsEndDategetTime()-tsBeginDategetTime())/86400000+1;

Log4jinfo("lDays===="+lDays);

}

return lDays;

}

/

格式化成Timestamp类型

@param sDt

@param bool

@return

/

public static javasqlTimestamp getDateTime(String sDt,boolean bool){

try{

return javasqlTimestampvalueOf(sDt); //sDt format:yyyy-mm-dd hh:mm:ssfffffffff

}catch(IllegalArgumentException iae){

if(bool)

sDt = sDt+" 23:59:590";

else

sDt = sDt+" 00:00:000";

return javasqlTimestampvalueOf(sDt);

}

}

/

根据时间获取日期字符串

@param ts

@return

/

public static String getDateString(Timestamp ts){

if(ts==null)

return "";

Calendar calendar = CalendargetInstance();

calendarsetTime(ts);

String strMonth = StringvalueOf(calendarget(CalendarMONTH)+1);

if(strMonthlength()==1){

strMonth = "0"+strMonth;

}

String strDay = StringvalueOf(calendarget(CalendarDATE));

if(strDaylength()==1){

strDay = "0"+strDay;

}

return calendarget(CalendarYEAR)+"-"+strMonth+"-"+strDay;

}

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