LocalDate与String互转

DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDate formatDate = LocalDate.of(2020, 2, 20);
String dateStr = formatDate.format(df);
System.out.println("LocalDate => String: " + dateStr);

DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDate dateParam = LocalDate.parse(dateStr, df);
System.out.println("String => LocalDate: " + dateParam);