Pagehelper不是特別好用。對list直接分頁
阿新 • • 發佈：2018-12-21
Pagehelper只對
PageHelper.startPage(pageNum,pageSize);
這一句後面的一個查詢起作用。
如果後面有兩個查詢，
則在
PageInfo<MessageDetail> pageInfo = new PageInfo<>(messages);
int total=pageInfo.size();
只能獲取當前頁的條數。而不是總數。
這個時候，pagehelper就不好用了。
只能對list直接分頁。
package com.zfzn.cwyms.message.util;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
/*
* 由於為了以後使用方便,所有方法的返回型別都設為了 java.util.Date 請在使用時根據自己的需要進行日期格式化處理,如:
*
* import java.text.SimpleDateFormat;SimpleDateFormat simpleDateFormat = new
* SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String todayBegin =
* simpleDateFormat.format
* (DateUtils.getDayBegin());System.out.println(todayBegin );//輸出結果為2017-10-26
* 00:00:00
*/
/**
* 1)獲取當天的開始時間
* 2)獲取當天的結束時間
* 3)獲取昨天的開始時間
* 4)獲取昨天的結束時間
* 5)獲取明天的開始時間
* 6)獲取明天的結束時間
* 7)獲取本週的開始時間
* 8)獲取本週的結束時間
* 9)獲取上週的開始時間
* 10)獲取上週的結束時間
* 11)獲取本月的開始時間
* 12)獲取本月的結束時間
* 13)獲取上月的開始時間
* 14)獲取上月的結束時間
* 15)獲取本年的開始時間
* 16)獲取本年的結束時間
* 17)獲取某個日期的開始時間
* 18)獲取某個日期的結束時間
* 19)獲取今年是哪一年
* 20)獲取本月是哪一月
* 21)兩個日期相減得到的天數
* 22)兩個日期相減得到的毫秒數
* 23)獲取兩個日期中的最大日期
* 24)獲取兩個日期中的最小日期
* 25)返回某月該季度的第一個月
* 26)返回某個日期下幾天的日期
* 27)返回某個日期前幾天的日期
* 28)獲取某年某月到某年某月按天的切片日期集合(間隔天數的集合)
* 29)獲取某年某月按天切片日期集合(某個月間隔多少天的日期集合)
*/
/**
* 日期工具類
*/
public class DatesUtil {
// 獲取當天的開始時間
public static java.util.Date getDayBegin() {
Calendar cal = new GregorianCalendar();
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTime();
}
// 獲取當天的結束時間
public static java.util.Date getDayEnd() {
Calendar cal = new GregorianCalendar();
cal.set(Calendar.HOUR_OF_DAY, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);
return cal.getTime();
}
// 獲取昨天的開始時間
public static Date getBeginDayOfYesterday() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayBegin());
cal.add(Calendar.DAY_OF_MONTH, -1);
return cal.getTime();
}
// 獲取昨天的結束時間
public static Date getEndDayOfYesterDay() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayEnd());
cal.add(Calendar.DAY_OF_MONTH, -1);
return cal.getTime();
}
// 獲取明天的開始時間
public static Date getBeginDayOfTomorrow() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayBegin());
cal.add(Calendar.DAY_OF_MONTH, 1);
return cal.getTime();
}
// 獲取明天的結束時間
public static Date getEndDayOfTomorrow() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayEnd());
cal.add(Calendar.DAY_OF_MONTH, 1);
return cal.getTime();
}
// 獲取本週的開始時間
@SuppressWarnings("unused")
public static Date getBeginDayOfWeek() {
Date date = new Date();
if (date == null) {
return null;
}
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
if (dayofweek == 1) {
dayofweek += 7;
}
cal.add(Calendar.DATE, 2 - dayofweek);
return getDayStartTime(cal.getTime());
}
// 獲取本週的結束時間
public static Date getEndDayOfWeek() {
Calendar cal = Calendar.getInstance();
cal.setTime(getBeginDayOfWeek());
cal.add(Calendar.DAY_OF_WEEK, 6);
Date weekEndSta = cal.getTime();
return getDayEndTime(weekEndSta);
}
// 獲取上週的開始時間
@SuppressWarnings("unused")
public static Date getBeginDayOfLastWeek() {
Date date = new Date();
if (date == null) {
return null;
}
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
if (dayofweek == 1) {
dayofweek += 7;
}
cal.add(Calendar.DATE, 2 - dayofweek - 7);
return getDayStartTime(cal.getTime());
}
// 獲取上週的結束時間
public static Date getEndDayOfLastWeek() {
Calendar cal = Calendar.getInstance();
cal.setTime(getBeginDayOfLastWeek());
cal.add(Calendar.DAY_OF_WEEK, 6);
Date weekEndSta = cal.getTime();
return getDayEndTime(weekEndSta);
}
// 獲取本月的開始時間
public static Date getBeginDayOfMonth() {
Calendar calendar = Calendar.getInstance();
calendar.set(getNowYear(), getNowMonth() - 1, 1);
return getDayStartTime(calendar.getTime());
}
// 獲取本月的結束時間
public static Date getEndDayOfMonth() {
Calendar calendar = Calendar.getInstance();
calendar.set(getNowYear(), getNowMonth() - 1, 1);
int day = calendar.getActualMaximum(5);
calendar.set(getNowYear(), getNowMonth() - 1, day);
return getDayEndTime(calendar.getTime());
}
// 獲取上月的開始時間
public static Date getBeginDayOfLastMonth() {
Calendar calendar = Calendar.getInstance();
calendar.set(getNowYear(), getNowMonth() - 2, 1);
return getDayStartTime(calendar.getTime());
}
// 獲取上月的結束時間
public static Date getEndDayOfLastMonth() {
Calendar calendar = Calendar.getInstance();
calendar.set(getNowYear(), getNowMonth() - 2, 1);
int day = calendar.getActualMaximum(5);
calendar.set(getNowYear(), getNowMonth() - 2, day);
return getDayEndTime(calendar.getTime());
}
// 獲取本年的開始時間
public static Date getBeginDayOfYear() {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, getNowYear());
cal.set(Calendar.MONTH, Calendar.JANUARY);
cal.set(Calendar.DATE, 1);
return getDayStartTime(cal.getTime());
}
// 獲取本年的結束時間
public static java.util.Date getEndDayOfYear() {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, getNowYear());
cal.set(Calendar.MONTH, Calendar.DECEMBER);
cal.set(Calendar.DATE, 31);
return getDayEndTime(cal.getTime());
}
// 獲取某個日期的開始時間
public static Timestamp getDayStartTime(Date d) {
Calendar calendar = Calendar.getInstance();
if (null != d)
calendar.setTime(d);
calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
calendar.set(Calendar.MILLISECOND, 0);
return new Timestamp(calendar.getTimeInMillis());
}
// 獲取某個日期的結束時間
public static Timestamp getDayEndTime(Date d) {
Calendar calendar = Calendar.getInstance();
if (null != d)
calendar.setTime(d);
calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH), 23, 59, 59);
calendar.set(Calendar.MILLISECOND, 999);
return new Timestamp(calendar.getTimeInMillis());
}
// 獲取今年是哪一年
public static Integer getNowYear() {
Date date = new Date();
GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
gc.setTime(date);
return Integer.valueOf(gc.get(1));
}
// 獲取本月是哪一月
public static int getNowMonth() {
Date date = new Date();
GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
gc.setTime(date);
return gc.get(2) + 1;
}
// 兩個日期相減得到的天數
public static int getDiffDays(Date beginDate, Date endDate) {
if (beginDate == null || endDate == null) {
throw new IllegalArgumentException("getDiffDays param is null!");
}
long diff = (endDate.getTime() - beginDate.getTime())
/ (1000 * 60 * 60 * 24);
int days = new Long(diff).intValue();
return days;
}
// 兩個日期相減得到的毫秒數
public static long dateDiff(Date beginDate, Date endDate) {
long date1ms = beginDate.getTime();
long date2ms = endDate.getTime();
return date2ms - date1ms;
}
// 獲取兩個日期中的最大日期
public static Date max(Date beginDate, Date endDate) {
if (beginDate == null) {
return endDate;
}
if (endDate == null) {
return beginDate;
}
if (beginDate.after(endDate)) {
return beginDate;
}
return endDate;
}
// 獲取兩個日期中的最小日期
public static Date min(Date beginDate, Date endDate) {
if (beginDate == null) {
return endDate;
}
if (endDate == null) {
return beginDate;
}
if (beginDate.after(endDate)) {
return endDate;
}
return beginDate;
}
// 返回某月該季度的第一個月
public static Date getFirstSeasonDate(Date date) {
final int[] SEASON = {1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4};
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int sean = SEASON[cal.get(Calendar.MONTH)];
cal.set(Calendar.MONTH, sean * 3 - 3);
return cal.getTime();
}
// 返回某個日期下幾天的日期
public static Date getNextDay(Date date, int i) {
Calendar cal = new GregorianCalendar();
cal.setTime(date);
cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);
return cal.getTime();
}
// 返回某個日期前幾天的日期
public static Date getFrontDay(Date date, int i) {
Calendar cal = new GregorianCalendar();
cal.setTime(date);
cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);
return cal.getTime();
}
// 獲取某年某月到某年某月按天的切片日期集合(間隔天數的集合)
@SuppressWarnings({"rawtypes", "unchecked"})
public static List getTimeList(int beginYear, int beginMonth, int endYear,
int endMonth, int k) {
List list = new ArrayList();
if (beginYear == endYear) {
for (int j = beginMonth; j <= endMonth; j++) {
list.add(getTimeList(beginYear, j, k));
}
} else {
{
for (int j = beginMonth; j < 12; j++) {
list.add(getTimeList(beginYear, j, k));
}
for (int i = beginYear + 1; i < endYear; i++) {
for (int j = 0; j < 12; j++) {
list.add(getTimeList(i, j, k));
}
}
for (int j = 0; j <= endMonth; j++) {
list.add(getTimeList(endYear, j, k));
}
}
}
return list;
}
// 獲取某年某月按天切片日期集合(某個月間隔多少天的日期集合)
@SuppressWarnings({"unchecked", "rawtypes"})
public static List getTimeList(int beginYear, int beginMonth, int k) {
List list = new ArrayList();
Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);
int max = begincal.getActualMaximum(Calendar.DATE);
for (int i = 1; i < max; i = i + k) {
list.add(begincal.getTime());
begincal.add(Calendar.DATE, k);
}
begincal = new GregorianCalendar(beginYear, beginMonth, max);
list.add(begincal.getTime());
return list;
}
}
這個類的使用方法：
ListPageUtil<MessageDetail> listPageUtil = new ListPageUtil<MessageDetail>(messages,pageNum, pageSize);
List<MessageDetail> pagedList = listPageUtil.getPagedList();