如何将LocalDate格式化为yyyyMMDD（不使用JodaTime）

Question

我正在尝试获取下一个即将到来的星期五的日期，并将其格式设置为
yyyyMMDD。如果可能，我想不使用JodaTime来执行此操作。这是
我的代码：

import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;
import java.time.DayOfWeek;
import java.time.format.DateTimeFormatter;

// snippet from main method
LocalDate friday = LocalDate.now().with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
DateTimeFormatter formatter = DateTimeFormatter.ofPattern('yyyyMMDD');
System.out.println(friday.format(formatter));

But when I run this I get the following error (running it today 20170809)

java.time.DateTimeException: Field DayOfYear cannot be printed as the value 223 exceeds the maximum print width of 2

我究竟做错了什么？

编辑：我正在使用Java 8

Answer 1

Big D means day-of-year. You have to use small d.

So in your case use "yyyyMMdd".

You can check all patterns
here.

This particular pattern is built into Java 8 and later:
DateTimeFormatter.BASIC_ISO_DATE