这是我的jsp页面源代码：<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ page import="java.time.format.DateTimeFormatter"%> <%@ page import="java.time.temporal.TemporalAdjusters"%> <%@ page import="java.time.LocalDate"%> <!DOCTYPE html><html><head><meta charset="UTF-8"><title>Local Date Demo</title></head><body><%int year=2018,month=12,date=1;LocalDate theMonthShiftStartDate=LocalDate.of(year,month,date);LocalDate theMonthShiftEndDate=theMonthShiftStartDate.with(TemporalAdjusters.lastDayOfMonth()); LocalDate previousMonthShiftStartDate=theMonthShiftStartDate.plusMonths(-1);LocalDate previousMonthShiftEndDate=previousMonthShiftStartDate.with(TemporalAdjusters.lastDayOfMonth());%>theMonthShiftStartDate=<%=theMonthShiftStartDate.format(DateTimeFormatter.ofPattern("YYYY-MM-dd"))%><br>theMonthShiftEndDate=<%=theMonthShiftEndDate.format(DateTimeFormatter.ofPattern("YYYY-MM-dd"))%><br>previousMonthShiftStartDate=<%=previousMonthShiftStartDate.format(DateTimeFormatter.ofPattern("YYYY-MM-dd"))%><br>previousMonthShiftEndDate=<%=previousMonthShiftEndDate.format(DateTimeFormatter.ofPattern("YYYY-MM-dd"))%><br></body></html>为什么输出如下： theMonthShiftStartDate=2018-12-01 theMonthShiftEndDate=2019-12-31 previousMonthShiftStartDate=2018-11-01 previousMonthShiftEndDate=2018-11-30我预计“月移日期”应该是2018-12-31，但是，它返回2019-12-31。根据爪哇多克： TemporalAdjusters.lastDayOfMonth() 返回“每月的最后一天”调整器，该调整器返回设置为当前月份的最后一天的新日期。我今天运行jsp，为什么问题只发生在“十二月”本地日期对象，而不发生在十一月？
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