remove unused functions

src/main/java/com/alibaba/excel/converters/DefaultConverterLoader.java

@@ -6,8 +6,6 @@ import java.util.Map;
 import com.alibaba.excel.converters.bigdecimal.BigDecimalBooleanConverter;
 import com.alibaba.excel.converters.bigdecimal.BigDecimalNumberConverter;
 import com.alibaba.excel.converters.bigdecimal.BigDecimalStringConverter;
-import com.alibaba.excel.converters.bigdecimal.BigIntegerBooleanConverter;
-import com.alibaba.excel.converters.biginteger.BigIntegerNumberConverter;
 import com.alibaba.excel.converters.biginteger.BigIntegerStringConverter;
 import com.alibaba.excel.converters.booleanconverter.BooleanBooleanConverter;
 import com.alibaba.excel.converters.booleanconverter.BooleanNumberConverter;
@@ -98,9 +96,7 @@ public class DefaultConverterLoader {
         putAllConverter(new StringStringConverter());
         putAllConverter(new StringErrorConverter());
 
-        putAllConverter(new BigIntegerBooleanConverter());
         putAllConverter(new BigIntegerStringConverter());
-        putAllConverter(new BigIntegerNumberConverter());
     }
 
     private static void initDefaultWriteConverter() {

src/main/java/com/alibaba/excel/converters/biginteger/BigIntegerBooleanConverter.java

@@ -1,47 +0,0 @@
-package com.alibaba.excel.converters.bigdecimal;
-
-import java.math.BigDecimal;
-import java.math.BigInteger;
-
-import com.alibaba.excel.converters.Converter;
-import com.alibaba.excel.enums.CellDataTypeEnum;
-import com.alibaba.excel.metadata.CellData;
-import com.alibaba.excel.metadata.GlobalConfiguration;
-import com.alibaba.excel.metadata.property.ExcelContentProperty;
-
-/**
- * BigDecimal and boolean converter
- *
- * @author Jiaju Zhuang
- */
-public class BigIntegerBooleanConverter implements Converter<BigInteger> {
-
-    @Override
-    public Class supportJavaTypeKey() {
-        return BigInteger.class;
-    }
-
-    @Override
-    public CellDataTypeEnum supportExcelTypeKey() {
-        return CellDataTypeEnum.BOOLEAN;
-    }
-
-    @Override
-    public BigInteger convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,
-                                        GlobalConfiguration globalConfiguration) {
-        if (cellData.getBooleanValue()) {
-            return BigInteger.ONE;
-        }
-        return BigInteger.ZERO;
-    }
-
-    @Override
-    public CellData convertToExcelData(BigInteger value, ExcelContentProperty contentProperty,
-                                       GlobalConfiguration globalConfiguration) {
-        if (BigDecimal.ONE.equals(value)) {
-            return new CellData(Boolean.TRUE);
-        }
-        return new CellData(Boolean.FALSE);
-    }
-
-}

src/main/java/com/alibaba/excel/converters/biginteger/BigIntegerNumberConverter.java

@@ -1,38 +0,0 @@
-package com.alibaba.excel.converters.biginteger;
-import java.math.BigInteger;
-
-import com.alibaba.excel.converters.Converter;
-import com.alibaba.excel.enums.CellDataTypeEnum;
-import com.alibaba.excel.metadata.CellData;
-import com.alibaba.excel.metadata.GlobalConfiguration;
-import com.alibaba.excel.metadata.property.ExcelContentProperty;
-
-/**
- * BigDecimal and number converter
- *
- * @author Jiaju Zhuang
- */
-public class BigIntegerNumberConverter implements Converter<BigInteger> {
-
-    @Override
-    public Class supportJavaTypeKey() {
-        return BigInteger.class;
-    }
-
-    @Override
-    public CellDataTypeEnum supportExcelTypeKey() {
-        return CellDataTypeEnum.NUMBER;
-    }
-
-    @Override
-    public BigInteger convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,
-                                        GlobalConfiguration globalConfiguration) {
-        return cellData.getNumberValue().toBigInteger();
-    }
-
-    @Override
-    public CellData convertToExcelData(BigInteger value, ExcelContentProperty contentProperty,
-                                       GlobalConfiguration globalConfiguration) {
-        return new CellData(value);
-    }
-}