修复导出浮点型数据可能精度异常的bug

pom.xml

@@ -4,7 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
-    <version>3.0.0-beta2</version>
+    <version>3.0.0-beta3</version>
     <packaging>jar</packaging>
     <name>easyexcel</name>
 

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

@@ -5,6 +5,7 @@ import com.alibaba.excel.metadata.property.ExcelContentProperty;
 
 import lombok.AllArgsConstructor;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
 /**
  * write converter context
@@ -12,6 +13,7 @@ import lombok.Data;
  * @author Jiaju Zhuang
  */
 @Data
+@NoArgsConstructor
 @AllArgsConstructor
 public class WriteConverterContext<T> {
 

src/main/java/com/alibaba/excel/util/NumberUtils.java

@@ -58,7 +58,7 @@ public class NumberUtils {
      * @return
      */
     public static WriteCellData<?> formatToCellData(Number num, ExcelContentProperty contentProperty) {
-        WriteCellData<?> cellData = new WriteCellData<>(BigDecimal.valueOf(num.doubleValue()));
+        WriteCellData<?> cellData = new WriteCellData<>(new BigDecimal(num.toString()));
         if (contentProperty != null && contentProperty.getNumberFormatProperty() != null
             && StringUtils.isNotBlank(contentProperty.getNumberFormatProperty().getFormat())) {
             WorkBookUtil.fillDataFormat(cellData, contentProperty.getNumberFormatProperty().getFormat(), null);
@@ -134,7 +134,7 @@ public class NumberUtils {
         if (!hasFormat(contentProperty)) {
             return new BigDecimal(string);
         }
-        return BigDecimal.valueOf(parse(string, contentProperty).doubleValue());
+        return new BigDecimal(parse(string, contentProperty).toString());
     }
 
     /**

src/test/java/com/alibaba/easyexcel/test/core/converter/ConverterTest.java

@@ -0,0 +1,29 @@
+package com.alibaba.easyexcel.test.core.converter;
+
+import java.math.BigDecimal;
+
+import com.alibaba.excel.converters.WriteConverterContext;
+import com.alibaba.excel.converters.floatconverter.FloatNumberConverter;
+import com.alibaba.excel.metadata.data.WriteCellData;
+
+import org.junit.Assert;
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runners.MethodSorters;
+
+/**
+ * @author Jiaju Zhuang
+ */
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class ConverterTest {
+
+    @Test
+    public void t01FloatNumberConverter() {
+        FloatNumberConverter floatNumberConverter = new FloatNumberConverter();
+        WriteConverterContext<Float> context = new WriteConverterContext<>();
+        context.setValue(95.62F);
+        WriteCellData<?> writeCellData = floatNumberConverter.convertToExcelData(context);
+        Assert.assertEquals(0, writeCellData.getNumberValue().compareTo(new BigDecimal("95.62")));
+    }
+
+}

update.md

@@ -1,3 +1,7 @@
+# 3.0.0-beta3
+
+* 修复导出浮点型数据可能精度异常的bug
+
 # 3.0.0-beta2
 
 * 优化写入样式