填充时候支持根据`sheetName`定位`sheet`

src/main/java/com/alibaba/excel/context/WriteContextImpl.java

@@ -103,10 +103,8 @@ public class WriteContextImpl implements WriteContext {
      */
     @Override
     public void currentSheet(WriteSheet writeSheet, WriteTypeEnum writeType) {
-        boolean illegalArgument =
+        if (writeSheet == null) {
-            writeSheet == null || (writeSheet.getSheetNo() == null && StringUtils.isEmpty(writeSheet.getSheetName()));
+            throw new IllegalArgumentException("Sheet argument cannot be null");
-        if (illegalArgument) {
-            throw new IllegalArgumentException("Sheet name and Sheet number can not be empty.");
         }
         if (selectSheetFromCache(writeSheet)) {
             return;

src/main/java/com/alibaba/excel/write/metadata/holder/WriteSheetHolder.java

@@ -10,6 +10,7 @@ import org.apache.poi.xssf.usermodel.XSSFSheet;
 
 import com.alibaba.excel.enums.HolderEnum;
 import com.alibaba.excel.enums.WriteLastRowTypeEnum;
+import com.alibaba.excel.util.StringUtils;
 import com.alibaba.excel.write.metadata.WriteSheet;
 
 /**
@@ -67,7 +68,11 @@ public class WriteSheetHolder extends AbstractWriteHolder {
     public WriteSheetHolder(WriteSheet writeSheet, WriteWorkbookHolder writeWorkbookHolder) {
         super(writeSheet, writeWorkbookHolder, writeWorkbookHolder.getWriteWorkbook().getConvertAllFiled());
         this.writeSheet = writeSheet;
+        if (writeSheet.getSheetNo() == null && StringUtils.isEmpty(writeSheet.getSheetName())) {
+            this.sheetNo = 0;
+        } else {
             this.sheetNo = writeSheet.getSheetNo();
+        }
         this.sheetName = writeSheet.getSheetName();
         this.parentWriteWorkbookHolder = writeWorkbookHolder;
         this.hasBeenInitializedTable = new HashMap<Integer, WriteTableHolder>();