java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: HourOfDay异常原因

x33g5p2x  于2021-08-03 转载在 Java  
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前言

在使用java8中的LocalDate进行时间格式化,报了一个异常,代码如下

LocalDate now = LocalDate.now();
    String day = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    String time = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));

在执行到

String time = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));

抛出异常,错误信息如下:

java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: HourOfDay
    	at java.time.LocalDate.get0(LocalDate.java:680)
    	at java.time.LocalDate.getLong(LocalDate.java:659)
    	at java.time.format.DateTimePrintContext.getValue(DateTimePrintContext.java:298)
    	at java.time.format.DateTimeFormatterBuilder$NumberPrinterParser.format(DateTimeFormatterBuilder.java:2540)
    	at java.time.format.DateTimeFormatterBuilder$CompositePrinterParser.format(DateTimeFormatterBuilder.java:2179)
    	at java.time.format.DateTimeFormatter.formatTo(DateTimeFormatter.java:1746)
    	at java.time.format.DateTimeFormatter.format(DateTimeFormatter.java:1720)
    	at java.time.LocalDate.format(LocalDate.java:1691)

到jdk源码中查看:

private int get0(TemporalField field) { 
        switch ((ChronoField) field) { 
            case DAY_OF_WEEK: return getDayOfWeek().getValue();
            case ALIGNED_DAY_OF_WEEK_IN_MONTH: return ((day - 1) % 7) + 1;
            case ALIGNED_DAY_OF_WEEK_IN_YEAR: return ((getDayOfYear() - 1) % 7) + 1;
            case DAY_OF_MONTH: return day;
            case DAY_OF_YEAR: return getDayOfYear();
            case EPOCH_DAY: throw new UnsupportedTemporalTypeException("Invalid field 'EpochDay' for get() method, use getLong() instead");
            case ALIGNED_WEEK_OF_MONTH: return ((day - 1) / 7) + 1;
            case ALIGNED_WEEK_OF_YEAR: return ((getDayOfYear() - 1) / 7) + 1;
            case MONTH_OF_YEAR: return month;
            case PROLEPTIC_MONTH: throw new UnsupportedTemporalTypeException("Invalid field 'ProlepticMonth' for get() method, use getLong() instead");
            case YEAR_OF_ERA: return (year >= 1 ? year : 1 - year);
            case YEAR: return year;
            case ERA: return (year >= 1 ? 1 : 0);
        }
        throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
    }

说明我在DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")中的的HH:mm:ss是不在case之中的。

原因

因为LocalDate中是不包含时分秒的,想要格式化时分秒需要用LocalDateTime这个类,里边包含的有时分秒

解决办法

正确使用LocalDateTimeLocalDate两个类:

LocalDateTime now = LocalDateTime.now();
    String day = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    String time = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));

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