将string字符串转成LocalDateTime工具类
高大北
发布
于
2022-06-14 20:30:48
发布
于
2022-06-14 20:30:48
文章被收录于专栏：
java架构计划训练营
```
public class LocalDateTimeUtil {
* 将Long类型的时间戳转换成String 类型的时间格式，时间格式为：yyyy-MM-dd HH:mm:ss
public static String convertTimeToString(Long time){
if (StringUtils.isEmpty(time)){
return null;
DateTimeFormatter ftf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
return ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(time), ZoneId.systemDefault()));
* 将Long类型的时间戳转换成String 类型的时间格式，时间格式为：yyyy-MM-dd
public static String convertTimeToStringYMD(Long time){
if (StringUtils.isEmpty(time)){
return null;
DateTimeFormatter ftf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
return ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(time), ZoneId.systemDefault()));
* 将字符串转日期成Long类型的时间戳，格式为：yyyy-MM-dd HH:mm:ss
public static Long convertTimeToLong(String time) {
if (StringUtils.isEmpty(time)){
throw new IllegalArgumentException("时间参数异常！");
DateTimeFormatter ftf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime parse = LocalDateTime.parse(time, ftf);
return LocalDateTime.from(parse).atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
* 将字符串转日期成Long类型的时间戳，格式为：yyyy-MM-dd
public static Long convertTimeToLongYMD(String time) {
if (StringUtils.isEmpty(time)){
throw new IllegalArgumentException("时间参数异常！");
DateTimeFormatter ftf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDateTime parse = LocalDateTime.parse(time, ftf);
return LocalDateTime.from(parse).atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
* 将日期转换为字符串，格式为：yyyy-MM-dd HH:mm:ss
* @param localDateTime
* @return
public static String convertDateToString(LocalDateTime localDateTime){
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String dateTime = dtf.format(localDateTime);
return dateTime;
* 将日期转换为字符串，格式为：yyyy-MM-dd
* @param localDateTime
* @return
public static String convertDateToStringYMD(LocalDateTime localDateTime){
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
String dateTime = dtf.format(localDateTime);
return dateTime;
* 将字符串转换为日期，格式为：yyyy-MM-dd HH:mm:ss
* @param time
* @return
public static LocalDateTime convertStringToDate(String time){
DateTimeFormatter dft = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime dateTime = LocalDateTime.parse(time, dft);
return dateTime;
* 将字符串转换为日期，格式为：yyyy-MM-dd
* @param time
* @return
public static LocalDateTime convertStringToDateYMD(String time){
DateTimeFormatter dft = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDateTime dateTime = LocalDateTime.parse(time, dft);
return dateTime;
* 取本月第一天
public static LocalDate firstDayOfThisMonth() {
LocalDate today = LocalDate.now();
return today.with(TemporalAdjusters.firstDayOfMonth());
* 取本月第N天
public static LocalDate dayOfThisMonth(int n) {
LocalDate today = LocalDate.now();
return today.withDayOfMonth(n);
* 取本月最后一天
public static LocalDate lastDayOfThisMonth() {
LocalDate today = LocalDate.now();
return today.with(TemporalAdjusters.lastDayOfMonth());
* 取本月第一天的开始时间
public static LocalDateTime startOfThisMonth() {
return LocalDateTime.of(firstDayOfThisMonth(), LocalTime.MIN);