修复在空字符串的时候 格式转换异常 #520

src/main/java/com/alibaba/excel/metadata/CellData.java

@@ -1,6 +1,7 @@
 package com.alibaba.excel.metadata;
 
 import com.alibaba.excel.enums.CellDataTypeEnum;
+import com.alibaba.excel.util.StringUtils;
 
 /**
  * Excel internal cell data
@@ -175,7 +176,7 @@ public class CellData {
         switch (type) {
             case STRING:
             case ERROR:
-                if (stringValue == null) {
+                if (StringUtils.isEmpty(stringValue)) {
                     type = CellDataTypeEnum.EMPTY;
                 }
                 return;

src/test/java/com/alibaba/easyexcel/test/temp/simple/HgTest.java

@@ -1,23 +1,14 @@
 package com.alibaba.easyexcel.test.temp.simple;
 
-import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.util.List;
 
-import org.apache.poi.xssf.streaming.SXSSFRow;
-import org.apache.poi.xssf.streaming.SXSSFSheet;
-import org.apache.poi.xssf.streaming.SXSSFWorkbook;
-import org.apache.poi.xssf.usermodel.XSSFRow;
-import org.apache.poi.xssf.usermodel.XSSFSheet;
-import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.junit.Ignore;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.alibaba.easyexcel.test.temp.poi.PoiTest;
-import com.alibaba.easyexcel.test.util.TestFileUtil;
 import com.alibaba.excel.EasyExcel;
 import com.alibaba.fastjson.JSON;
 
@@ -32,8 +23,8 @@ public class HgTest {
 
     @Test
     public void hh() throws IOException {
-        List<Object> list =
+        List<Object> list = EasyExcel.read(new FileInputStream("D:\\test\\hg2.xlsx")).autoTrim(Boolean.FALSE).sheet()
-            EasyExcel.read(new FileInputStream("D:\\test\\hg2.xlsx")).sheet().headRowNumber(0).doReadSync();
+            .headRowNumber(0).doReadSync();
         for (Object data : list) {
             LOGGER.info("返回数据：{}", JSON.toJSONString(data));
         }

update.md

@@ -2,6 +2,7 @@
 * 加速gc回收 [Issue #511](https://github.com/alibaba/easyexcel/issues/511)
 * 修改空字符串读取可能读取上个字段的数据的bug
 * 修改换行数据无法读取的bug
+* 修复在空字符串的时候 格式转换异常 [Issue #520](https://github.com/alibaba/easyexcel/issues/520)
 
 # 2.0.0-beta1
 * 优化读写逻辑