新增写入demo：为指定行标记背景颜色、为指定行转化数字格式为百分比格式

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/write/CustomRowAddBackgroundColorHandler.java

@@ -0,0 +1,53 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import com.alibaba.excel.metadata.data.WriteCellData;
+import com.alibaba.excel.write.handler.CellWriteHandler;
+import com.alibaba.excel.write.handler.context.CellWriteHandlerContext;
+import com.alibaba.excel.write.metadata.style.WriteCellStyle;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.FillPatternType;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+/**
+ * 为指定行添加背景颜色
+ * @author raxcl
+ */
+public class CustomRowAddBackgroundColorHandler implements CellWriteHandler {
+    private final int colorIndex;
+    private final List<Integer> rowList;
+
+
+    public CustomRowAddBackgroundColorHandler(int colorIndex, Integer ...row) {
+        this.colorIndex = colorIndex;
+        this.rowList = new ArrayList<>();
+        rowList.addAll(Stream.of(row).collect(Collectors.toList()));
+    }
+
+    @Override
+    public void afterCellDispose(CellWriteHandlerContext context) {
+        Cell cell = context.getCell();
+        int rowIndex = cell.getRowIndex();
+
+        // 自定义样式处理
+        // 当前事件会在 数据设置到poi的cell里面才会回调
+        // 指定行设置背景颜色
+        if (rowList.contains(rowIndex)) {
+            // 第一个单元格
+            // 只要不是头 一定会有数据 当然fill的情况 可能要context.getCellDataList() ,这个需要看模板，因为一个单元格会有多个 WriteCellData
+            WriteCellData<?> cellData = context.getFirstCellData();
+            // 这里需要去cellData 获取样式
+            // 很重要的一个原因是 WriteCellStyle 和 dataFormatData绑定的 简单的说 比如你加了 DateTimeFormat
+            // ，已经将writeCellStyle里面的dataFormatData 改了 如果你自己new了一个WriteCellStyle，可能注解的样式就失效了
+            // 然后 getOrCreateStyle 用于返回一个样式，如果为空，则创建一个后返回
+            WriteCellStyle writeCellStyle = cellData.getOrCreateStyle();
+            //writeCellStyle.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.getIndex());
+            writeCellStyle.setFillForegroundColor((short) this.colorIndex);
+            // 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND
+            writeCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
+        }
+    }
+}

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/write/CustomRowSetPercentageFormatHandler.java

@@ -0,0 +1,42 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import com.alibaba.excel.metadata.data.DataFormatData;
+import com.alibaba.excel.metadata.data.WriteCellData;
+import com.alibaba.excel.write.handler.CellWriteHandler;
+import com.alibaba.excel.write.handler.context.CellWriteHandlerContext;
+import com.alibaba.excel.write.metadata.style.WriteCellStyle;
+import org.apache.poi.ss.usermodel.Cell;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * 为指定行设置百分比格式
+ * @author raxcl
+ */
+public class CustomRowSetPercentageFormatHandler implements CellWriteHandler {
+    private final List<Integer> rowList;
+
+    public CustomRowSetPercentageFormatHandler(Integer... rows) {
+        this.rowList = new ArrayList<>();
+        Collections.addAll(this.rowList, rows);
+    }
+
+    @Override
+    public void afterCellDispose(CellWriteHandlerContext context) {
+        // 获取当前单元格
+        Cell cell = context.getCell();
+        int rowIndex = cell.getRowIndex();
+
+        // 如果是我们要设置的行
+        if (rowList.contains(rowIndex)) {
+            WriteCellData<?> cellData = context.getFirstCellData();
+            WriteCellStyle writeCellStyle = cellData.getOrCreateStyle();
+            DataFormatData dataFormatData = new DataFormatData();
+            dataFormatData.setIndex((short)10);
+            // 设置百分比
+            writeCellStyle.setDataFormatData(dataFormatData);
+        }
+    }
+}

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java

@@ -33,6 +33,7 @@
 import com.alibaba.excel.util.FileUtils;
 import com.alibaba.excel.util.ListUtils;
 import com.alibaba.excel.write.handler.CellWriteHandler;
+import com.alibaba.excel.write.handler.WriteHandler;
 import com.alibaba.excel.write.handler.context.CellWriteHandlerContext;
 import com.alibaba.excel.write.merge.LoopMergeStrategy;
 import com.alibaba.excel.write.metadata.WriteSheet;
@@ -769,4 +770,34 @@ private List<DemoData> data() {
         return list;
     }
 
+    /**
+     * 为指定行标记背景颜色、为指定行转化数字格式为百分比格式
+     */
+    @Test
+    public void testLineWrite() {
+        String fileName = TestFileUtil.getPath() + "handlerStyleWrite" + System.currentTimeMillis() + ".xlsx";
+        ExcelWriter excelWriter = EasyExcel.write(fileName).build();
+
+        //写入
+        WriteSheet writeSheet1 = EasyExcel.writerSheet(0).build();
+        List<WriteHandler> cellWriteHandlerList = new ArrayList<>();
+        //指定行设置背景颜色
+        cellWriteHandlerList.add(new CustomRowAddBackgroundColorHandler(IndexedColors.GREY_25_PERCENT.getIndex(),1, 9, 13, 17, 22));
+        // 指定行设置百分比格式
+        cellWriteHandlerList.add(new CustomRowSetPercentageFormatHandler(2, 10, 14, 18, 23));
+        writeSheet1.setCustomWriteHandlerList(cellWriteHandlerList);
+        // 分页去数据库查询数据 这里可以去数据库查询每一页的数据
+        List<ConverterData> data = new ArrayList<>();
+        for (int i = 0; i < 10; i++) {
+            ConverterData converterData = new ConverterData();
+            converterData.setString("字符串" + i);
+            converterData.setDate(new Date());
+            converterData.setDoubleData(0.56);
+            data.add(converterData);
+        }
+        excelWriter.fill(data, writeSheet1);
+    }
+
+
+
 }