diff --git a/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java b/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java
index ef627392..4898ff2c 100644
--- a/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java
+++ b/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java
@@ -8,6 +8,10 @@ import java.util.Date;
 
 import com.alibaba.excel.metadata.data.FormulaData;
 
+import lombok.AccessLevel;
+import lombok.Data;
+import lombok.Getter;
+import lombok.Setter;
 import org.apache.poi.ss.SpreadsheetVersion;
 import org.apache.poi.ss.usermodel.CellBase;
 import org.apache.poi.ss.usermodel.CellStyle;
@@ -24,16 +28,21 @@ import org.apache.poi.ss.util.CellRangeAddress;
  *
  * @author Jiaju Zhuang
  */
+@Data
 public class CsvCell extends CellBase {
 
     /**
      * column index
      */
+    @Getter(value = AccessLevel.NONE)
+    @Setter(value = AccessLevel.NONE)
     private Integer columnIndex;
 
     /**
      * cell type
      */
+    @Getter(value = AccessLevel.NONE)
+    @Setter(value = AccessLevel.NONE)
     private CellType cellType;
     /**
      * row
@@ -132,6 +141,24 @@ public class CsvCell extends CellBase {
         richTextString = value;
     }
 
+    @Override
+    public void setCellValue(String value) {
+        if (value == null) {
+            setBlank();
+            return;
+        }
+        setCellValueImpl(value);
+    }
+
+    @Override
+    public void setCellValue(RichTextString value) {
+        if (value == null || value.getString() == null) {
+            setBlank();
+            return;
+        }
+        setCellValueImpl(value);
+    }
+
     @Override
     protected SpreadsheetVersion getSpreadsheetVersion() {
         return null;
diff --git a/src/main/java/com/alibaba/excel/metadata/csv/CsvCellStyle.java b/src/main/java/com/alibaba/excel/metadata/csv/CsvCellStyle.java
index 8c8fe981..ca153e45 100644
--- a/src/main/java/com/alibaba/excel/metadata/csv/CsvCellStyle.java
+++ b/src/main/java/com/alibaba/excel/metadata/csv/CsvCellStyle.java
@@ -2,6 +2,7 @@ package com.alibaba.excel.metadata.csv;
 
 import com.alibaba.excel.metadata.data.DataFormatData;
 
+import lombok.Data;
 import org.apache.poi.ss.usermodel.BorderStyle;
 import org.apache.poi.ss.usermodel.CellStyle;
 import org.apache.poi.ss.usermodel.Color;
@@ -15,6 +16,7 @@ import org.apache.poi.ss.usermodel.VerticalAlignment;
  *
  * @author Jiaju Zhuang
  */
+@Data
 public class CsvCellStyle implements CellStyle {
 
     /**
@@ -33,22 +35,31 @@ public class CsvCellStyle implements CellStyle {
 
     @Override
     public short getIndex() {
-        return 0;
+        return index;
     }
 
     @Override
     public void setDataFormat(short fmt) {
+        initDataFormatData();
+        dataFormatData.setIndex(fmt);
+    }
 
+    private void initDataFormatData() {
+        if (dataFormatData == null) {
+            dataFormatData = new DataFormatData();
+        }
     }
 
     @Override
     public short getDataFormat() {
-        return 0;
+        initDataFormatData();
+        return dataFormatData.getIndex();
     }
 
     @Override
     public String getDataFormatString() {
-        return null;
+        initDataFormatData();
+        return dataFormatData.getFormat();
     }
 
     @Override
diff --git a/src/main/java/com/alibaba/excel/metadata/csv/CsvRow.java b/src/main/java/com/alibaba/excel/metadata/csv/CsvRow.java
index d7248313..0550e611 100644
--- a/src/main/java/com/alibaba/excel/metadata/csv/CsvRow.java
+++ b/src/main/java/com/alibaba/excel/metadata/csv/CsvRow.java
@@ -3,6 +3,7 @@ package com.alibaba.excel.metadata.csv;
 import java.util.Iterator;
 import java.util.List;
 
+import lombok.Data;
 import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.compress.utils.Lists;
 import org.apache.poi.ss.usermodel.Cell;
@@ -16,6 +17,7 @@ import org.apache.poi.ss.usermodel.Sheet;
  *
  * @author Jiaju Zhuang
  */
+@Data
 public class CsvRow implements Row {
 
     /**
diff --git a/src/main/java/com/alibaba/excel/metadata/csv/CsvSheet.java b/src/main/java/com/alibaba/excel/metadata/csv/CsvSheet.java
index 07f09e73..fa83fd47 100644
--- a/src/main/java/com/alibaba/excel/metadata/csv/CsvSheet.java
+++ b/src/main/java/com/alibaba/excel/metadata/csv/CsvSheet.java
@@ -1,13 +1,7 @@
 package com.alibaba.excel.metadata.csv;
 
 import java.io.Closeable;
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.OutputStream;
-import java.io.OutputStreamWriter;
-import java.nio.charset.Charset;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
@@ -77,22 +71,6 @@ public class CsvSheet implements Sheet, Closeable {
      */
     private CSVPrinter csvPrinter;
 
-    public CsvSheet(CsvWorkbook csvWorkbook, File file, Charset charset) throws FileNotFoundException {
-        this.csvWorkbook = csvWorkbook;
-        this.out = new OutputStreamWriter(new FileOutputStream(file), charset);
-        this.rowCacheCount = 500;
-        this.csvFormat = CSVFormat.DEFAULT;
-        this.lastRowIndex = -1;
-    }
-
-    public CsvSheet(CsvWorkbook csvWorkbook, OutputStream outputStream) {
-        this.csvWorkbook = csvWorkbook;
-        this.out = new OutputStreamWriter(outputStream);
-        this.rowCacheCount = 500;
-        this.csvFormat = CSVFormat.DEFAULT;
-        this.lastRowIndex = -1;
-    }
-
     public CsvSheet(CsvWorkbook csvWorkbook, Appendable out) {
         this.csvWorkbook = csvWorkbook;
         this.out = out;
diff --git a/src/main/java/com/alibaba/excel/metadata/data/DataFormatData.java b/src/main/java/com/alibaba/excel/metadata/data/DataFormatData.java
index 7f1a14c8..2cbcb42c 100644
--- a/src/main/java/com/alibaba/excel/metadata/data/DataFormatData.java
+++ b/src/main/java/com/alibaba/excel/metadata/data/DataFormatData.java
@@ -19,6 +19,10 @@ public class DataFormatData {
      */
     private String format;
 
+    public DataFormatData() {
+        this.index = 0;
+    }
+
     @Override
     public DataFormatData clone() {
         DataFormatData dataFormatData = new DataFormatData();
diff --git a/src/main/java/com/alibaba/excel/util/WorkBookUtil.java b/src/main/java/com/alibaba/excel/util/WorkBookUtil.java
index 3fb6575e..5071709d 100644
--- a/src/main/java/com/alibaba/excel/util/WorkBookUtil.java
+++ b/src/main/java/com/alibaba/excel/util/WorkBookUtil.java
@@ -1,6 +1,5 @@
 package com.alibaba.excel.util;
 
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 
@@ -68,16 +67,9 @@ public class WorkBookUtil {
                 }
                 return;
             case CSV:
-                CsvWorkbook csvWorkbook;
-                if (writeWorkbookHolder.getFile() != null) {
-                    csvWorkbook = new CsvWorkbook(
-                        new OutputStreamWriter(new FileOutputStream(writeWorkbookHolder.getFile()),
-                            writeWorkbookHolder.getFileCharset()),
-                        writeWorkbookHolder.getGlobalConfiguration().getLocale());
-                } else {
-                    csvWorkbook = new CsvWorkbook(null, writeWorkbookHolder.getGlobalConfiguration().getLocale());
-                }
-                CsvWorkbook csvWorkbook = new CsvWorkbook(writeWorkbookHolder);
+                CsvWorkbook csvWorkbook = new CsvWorkbook(
+                    new OutputStreamWriter(writeWorkbookHolder.getOutputStream(), writeWorkbookHolder.getCharset()),
+                    writeWorkbookHolder.getGlobalConfiguration().getLocale());
                 writeWorkbookHolder.setCachedWorkbook(csvWorkbook);
                 writeWorkbookHolder.setWorkbook(csvWorkbook);
                 return;
diff --git a/src/main/java/com/alibaba/excel/write/metadata/WriteWorkbook.java b/src/main/java/com/alibaba/excel/write/metadata/WriteWorkbook.java
index 899e4ca1..9f4bea5c 100644
--- a/src/main/java/com/alibaba/excel/write/metadata/WriteWorkbook.java
+++ b/src/main/java/com/alibaba/excel/write/metadata/WriteWorkbook.java
@@ -3,6 +3,7 @@ package com.alibaba.excel.write.metadata;
 import java.io.File;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.Charset;
 
 import com.alibaba.excel.support.ExcelTypeEnum;
 
@@ -31,6 +32,10 @@ public class WriteWorkbook extends WriteBasicParameter {
      * If 'outputStream' and 'file' all not empty,file first
      */
     private OutputStream outputStream;
+    /**
+     * output charset
+     */
+    private Charset charset;
     /**
      * Template input stream
      * <p>
diff --git a/src/main/java/com/alibaba/excel/write/metadata/holder/WriteWorkbookHolder.java b/src/main/java/com/alibaba/excel/write/metadata/holder/WriteWorkbookHolder.java
index cb29ec22..a7871ba7 100644
--- a/src/main/java/com/alibaba/excel/write/metadata/holder/WriteWorkbookHolder.java
+++ b/src/main/java/com/alibaba/excel/write/metadata/holder/WriteWorkbookHolder.java
@@ -65,14 +65,14 @@ public class WriteWorkbookHolder extends AbstractWriteHolder {
      * If 'outputStream' and 'file' all not empty,file first
      */
     private File file;
-    /**
-     * charset of final output file
-     */
-    private Charset fileCharset;
     /**
      * Final output stream
      */
     private OutputStream outputStream;
+    /**
+     * output charset
+     */
+    private Charset charset;
     /**
      * Template input stream
      * <p>
@@ -152,6 +152,13 @@ public class WriteWorkbookHolder extends AbstractWriteHolder {
         } else {
             this.outputStream = writeWorkbook.getOutputStream();
         }
+
+        if (writeWorkbook.getCharset() == null) {
+            this.charset = Charset.defaultCharset();
+        } else {
+            this.charset = writeWorkbook.getCharset();
+        }
+
         if (writeWorkbook.getAutoCloseStream() == null) {
             this.autoCloseStream = Boolean.TRUE;
         } else {