private static void initAllConverter() {
        allConverter = MapUtils.newHashMapWithExpectedSize(40);
        putAllConverter(new BigDecimalBooleanConverter());
        putAllConverter(new BigDecimalNumberConverter());
        putAllConverter(new BigDecimalStringConverter());

        putAllConverter(new BigIntegerBooleanConverter());
        putAllConverter(new BigIntegerNumberConverter());
        putAllConverter(new BigIntegerStringConverter());

        putAllConverter(new BooleanBooleanConverter());
        putAllConverter(new BooleanNumberConverter());
        putAllConverter(new BooleanStringConverter());

        putAllConverter(new ByteBooleanConverter());
        putAllConverter(new ByteNumberConverter());
        putAllConverter(new ByteStringConverter());

        putAllConverter(new DateNumberConverter());
        putAllConverter(new DateStringConverter());

        putAllConverter(new LocalDateNumberConverter());
        putAllConverter(new LocalDateStringConverter());

        putAllConverter(new LocalDateTimeNumberConverter());
        putAllConverter(new LocalDateTimeStringConverter());

        putAllConverter(new DoubleBooleanConverter());
        putAllConverter(new DoubleNumberConverter());
        putAllConverter(new DoubleStringConverter());

        putAllConverter(new FloatBooleanConverter());
        putAllConverter(new FloatNumberConverter());
        putAllConverter(new FloatStringConverter());

        putAllConverter(new IntegerBooleanConverter());
        putAllConverter(new IntegerNumberConverter());
        putAllConverter(new IntegerStringConverter());

        putAllConverter(new LongBooleanConverter());
        putAllConverter(new LongNumberConverter());
        putAllConverter(new LongStringConverter());

        putAllConverter(new ShortBooleanConverter());
        putAllConverter(new ShortNumberConverter());
        putAllConverter(new ShortStringConverter());

        putAllConverter(new StringBooleanConverter());
        putAllConverter(new StringNumberConverter());
        putAllConverter(new StringStringConverter());
        putAllConverter(new StringErrorConverter());
    }
Load default handler

@author Jiaju Zhuang
fastexcel-core/src/main/java/cn/idev/excel/converters/DefaultConverterLoader.java