fix float bug

hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java

@@ -1080,11 +1080,11 @@ public class NumberUtil {
 	 * @since 5.6.5
 	 */
 	public static String decimalFormat(String pattern, Object value, RoundingMode roundingMode) {
-		if(value instanceof Number){
+		if (value instanceof Number) {
 			Assert.isTrue(isValidNumber((Number) value), "value is NaN or Infinite!");
 		}
 		final DecimalFormat decimalFormat = new DecimalFormat(pattern);
-		if(null != roundingMode){
+		if (null != roundingMode) {
 			decimalFormat.setRoundingMode(roundingMode);
 		}
 		return decimalFormat.format(value);
@@ -1472,7 +1472,7 @@ public class NumberUtil {
 	 * @since 5.6.0
 	 */
 	public static BigInteger factorial(BigInteger n) {
-		if(n.equals(BigInteger.ZERO)){
+		if (n.equals(BigInteger.ZERO)) {
 			return BigInteger.ONE;
 		}
 		return factorial(n, BigInteger.ZERO);
@@ -1492,21 +1492,21 @@ public class NumberUtil {
 	public static BigInteger factorial(BigInteger start, BigInteger end) {
 		Assert.notNull(start, "Factorial start must be not null!");
 		Assert.notNull(end, "Factorial end must be not null!");
-		if(start.compareTo(BigInteger.ZERO) < 0 || end.compareTo(BigInteger.ZERO) < 0){
+		if (start.compareTo(BigInteger.ZERO) < 0 || end.compareTo(BigInteger.ZERO) < 0) {
 			throw new IllegalArgumentException(StrUtil.format("Factorial start and end both must be > 0, but got start={}, end={}", start, end));
 		}
 
-		if (start.equals(BigInteger.ZERO)){
+		if (start.equals(BigInteger.ZERO)) {
 			start = BigInteger.ONE;
 		}
 
-		if(end.compareTo(BigInteger.ONE) < 0){
+		if (end.compareTo(BigInteger.ONE) < 0) {
 			end = BigInteger.ONE;
 		}
 
 		BigInteger result = start;
 		end = end.add(BigInteger.ONE);
-		while(start.compareTo(end) > 0) {
+		while (start.compareTo(end) > 0) {
 			start = start.subtract(BigInteger.ONE);
 			result = result.multiply(start);
 		}
@@ -2116,7 +2116,7 @@ public class NumberUtil {
 	 */
 	public static String toStr(BigDecimal bigDecimal, boolean isStripTrailingZeros) {
 		Assert.notNull(bigDecimal, "BigDecimal is null !");
-		if(isStripTrailingZeros){
+		if (isStripTrailingZeros) {
 			bigDecimal = bigDecimal.stripTrailingZeros();
 		}
 		return bigDecimal.toPlainString();
@@ -2669,10 +2669,26 @@ public class NumberUtil {
 	 * @return 结果
 	 * @since 5.7.6
 	 */
-	public static double calculate(String expression){
+	public static double calculate(String expression) {
 		return Calculator.conversion(expression);
 	}
 
+	/**
+	 * Number值转换为double<br>
+	 * float强制转换存在精度问题，此方法避免精度丢失
+	 *
+	 * @param value 被转换的float值
+	 * @return double值
+	 * @since 5.7.8
+	 */
+	public static double toDouble(Number value) {
+		if(value instanceof Float){
+			return Double.parseDouble(value.toString());
+		}else{
+			return value.doubleValue();
+		}
+	}
+
 	// ------------------------------------------------------------------------------------------- Private method start
 	private static int mathSubNode(int selectNum, int minNum) {
 		if (selectNum == minNum) {

hutool-poi/src/main/java/cn/hutool/poi/excel/cell/setters/NumberCellSetter.java

@@ -1,5 +1,6 @@
 package cn.hutool.poi.excel.cell.setters;
 
+import cn.hutool.core.util.NumberUtil;
 import cn.hutool.poi.excel.cell.CellSetter;
 import org.apache.poi.ss.usermodel.Cell;
 
@@ -26,10 +27,6 @@ public class NumberCellSetter implements CellSetter {
 	public void setValue(Cell cell) {
 		// issue https://gitee.com/dromara/hutool/issues/I43U9G
 		// 避免float到double的精度问题
-		if (value instanceof Float) {
+		cell.setCellValue(NumberUtil.toDouble(value));
-			cell.setCellValue(value.floatValue());
-		} else {
-			cell.setCellValue(value.doubleValue());
-		}
 	}
 }

hutool-poi/src/test/java/cn/hutool/poi/excel/ExcelWriteTest.java

@@ -721,4 +721,16 @@ public class ExcelWriteTest {
 
 		writer.close();
 	}
+
+	@Test
+	@Ignore
+	public void writeFloatTest(){
+		//issue https://gitee.com/dromara/hutool/issues/I43U9G
+		String path = "d:/test/floatTest.xlsx";
+		FileUtil.del(path);
+
+		final ExcelWriter writer = ExcelUtil.getWriter(path);
+		writer.writeRow(ListUtil.of(22.9f));
+		writer.close();
+	}
 }