修改head是List时，内容单元格的样式不生效 #1339

src/main/java/com/alibaba/excel/write/style/AbstractCellStyleStrategy.java

@@ -22,6 +22,7 @@ import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
  * @author Jiaju Zhuang
  */
 public abstract class AbstractCellStyleStrategy implements CellWriteHandler, WorkbookWriteHandler, NotRepeatExecutor {
+
     boolean hasInitialized = false;
 
     @Override
@@ -50,7 +51,7 @@ public abstract class AbstractCellStyleStrategy implements CellWriteHandler, Wor
     @Override
     public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder,
         List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
-        if (isHead == null || head == null) {
+        if (isHead == null) {
             return;
         }
         if (isHead) {

src/main/java/com/alibaba/excel/write/style/AbstractVerticalCellStyleStrategy.java

@@ -12,7 +12,6 @@ import com.alibaba.excel.util.StyleUtil;
 import com.alibaba.excel.write.metadata.style.WriteCellStyle;
 
 /**
- *
  * Use the same style for the column
  *
  * @author Jiaju Zhuang
@@ -30,6 +29,9 @@ public abstract class AbstractVerticalCellStyleStrategy extends AbstractCellStyl
 
     @Override
     protected void setHeadCellStyle(Cell cell, Head head, Integer relativeRowIndex) {
+        if (head == null) {
+            return;
+        }
         int columnIndex = head.getColumnIndex();
         if (headCellStyleCache.containsKey(columnIndex)) {
             CellStyle cellStyle = headCellStyleCache.get(columnIndex);
@@ -50,6 +52,9 @@ public abstract class AbstractVerticalCellStyleStrategy extends AbstractCellStyl
 
     @Override
     protected void setContentCellStyle(Cell cell, Head head, Integer relativeRowIndex) {
+        if (head == null) {
+            return;
+        }
         int columnIndex = head.getColumnIndex();
         if (contentCellStyleCache.containsKey(columnIndex)) {
             CellStyle cellStyle = contentCellStyleCache.get(columnIndex);
@@ -71,8 +76,7 @@ public abstract class AbstractVerticalCellStyleStrategy extends AbstractCellStyl
     /**
      * Returns the column width corresponding to each column head
      *
-     * @param head
+     * @param head Nullable
-     *            Nullable
      * @return
      */
     protected abstract WriteCellStyle headCellStyle(Head head);
@@ -80,8 +84,7 @@ public abstract class AbstractVerticalCellStyleStrategy extends AbstractCellStyl
     /**
      * Returns the column width corresponding to each column head
      *
-     * @param head
+     * @param head Nullable
-     *            Nullable
      * @return
      */
     protected abstract WriteCellStyle contentCellStyle(Head head);

src/test/java/com/alibaba/easyexcel/test/temp/WriteV34Test.java

@@ -0,0 +1,86 @@
+package com.alibaba.easyexcel.test.temp;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.poi.ss.usermodel.FillPatternType;
+import org.apache.poi.ss.usermodel.IndexedColors;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.alibaba.easyexcel.test.demo.write.DemoData;
+import com.alibaba.easyexcel.test.util.TestFileUtil;
+import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.ExcelWriter;
+import com.alibaba.excel.write.metadata.WriteSheet;
+import com.alibaba.excel.write.metadata.style.WriteCellStyle;
+import com.alibaba.excel.write.metadata.style.WriteFont;
+import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
+
+/**
+ * 临时测试
+ *
+ * @author Jiaju Zhuang
+ **/
+@Ignore
+public class WriteV34Test {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(WriteV34Test.class);
+
+    @Test
+    public void test() throws Exception {
+        String fileName = TestFileUtil.getPath() + "handlerStyleWrite" + System.currentTimeMillis() + ".xlsx";
+        // 头的策略
+        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
+        // 背景设置为红色
+        headWriteCellStyle.setFillForegroundColor(IndexedColors.RED.getIndex());
+        WriteFont headWriteFont = new WriteFont();
+        headWriteFont.setFontHeightInPoints((short)20);
+        headWriteCellStyle.setWriteFont(headWriteFont);
+        // 内容的策略
+        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
+        // 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定
+        contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
+        // 背景绿色
+        contentWriteCellStyle.setFillForegroundColor(IndexedColors.GREEN.getIndex());
+        WriteFont contentWriteFont = new WriteFont();
+        // 字体大小
+        contentWriteFont.setFontHeightInPoints((short)20);
+        contentWriteCellStyle.setWriteFont(contentWriteFont);
+        // 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
+        HorizontalCellStyleStrategy horizontalCellStyleStrategy =
+            new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
+
+        // 这里 需要指定写用哪个class去写，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcel.write(fileName).head(head()).registerWriteHandler(horizontalCellStyleStrategy).sheet("模板")
+            .doWrite(data(1));
+    }
+
+
+    private List<List<String>> head() {
+        List<List<String>> list = new ArrayList<List<String>>();
+        List<String> head0 = new ArrayList<String>();
+        head0.add("字符串" + System.currentTimeMillis());
+        List<String> head1 = new ArrayList<String>();
+        head1.add("数字" + System.currentTimeMillis());
+        List<String> head2 = new ArrayList<String>();
+        head2.add("日期" + System.currentTimeMillis());
+        list.add(head0);
+        list.add(head1);
+        list.add(head2);
+        return list;
+    }
+
+    private List<DemoData> data(int no) {
+        List<DemoData> list = new ArrayList<DemoData>();
+        for (int i = 0; i < 10; i++) {
+            DemoData data = new DemoData();
+            data.setString("字符串" + no + "---" + i);
+            list.add(data);
+        }
+        return list;
+    }
+
+}

update.md

@@ -4,6 +4,7 @@
 * 修复07版仅有样式的空行 默认不忽略的bug
 * 写入`sheet`不设置`index`和`name`默认不为0的问题
 * 修复多个`sheet`不按照顺序写入 会乱序的bug [Issue #1332](https://github.com/alibaba/easyexcel/issues/1332)
+* 修改head是List时，内容单元格的样式不生效 [Issue #1339](https://github.com/alibaba/easyexcel/issues/1339)
 
 
 # 2.2.3