{ ClassLoader classLoader = DefaultFormattingConversionService.class.getClassLoader(); // 判断是否导入了jsr354
formatterRegistry.addFormatterForFieldAnnotation(new NumberFormatAnnotationFormatterFactory()); // Default handling of monetary values // JSR354 NUMBER DEFAULT, NUMBER, PERCENT, CURRENCY } } Jsr354NumberFormatAnnotationFormatterFactory 也就是Jsr354