1.README.md增加测试类的跳转

2.WriteTest类中增加数据验证自定义拦截器的案例

easyexcel-test/README.md

@@ -1,3 +1,8 @@
 # easyexcel-test
 
-测试案例
+测试案例
+
+* [写的填充写法(Fill)](src/test/java/com/alibaba/easyexcel/test/demo/fill/FillTest.java)
+* [读的常见写法](src/test/java/com/alibaba/easyexcel/test/demo/read/ReadTest.java)
+* [web读写案例](src/test/java/com/alibaba/easyexcel/test/demo/web/WebTest.java)
+* [写的常见写法](src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java)

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

@@ -0,0 +1,38 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import com.alibaba.excel.write.handler.SheetWriteHandler;
+import com.alibaba.excel.write.handler.context.SheetWriteHandlerContext;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.poi.ss.usermodel.DataValidation;
+import org.apache.poi.ss.usermodel.DataValidationConstraint;
+import org.apache.poi.ss.usermodel.DataValidationHelper;
+import org.apache.poi.ss.util.CellRangeAddressList;
+
+
+/**
+ * 自定义拦截器，实现对特定列增加数据验证
+ *
+ * @author Xin Yan
+ */
+@Slf4j
+public class DataValidationSheetWriteHandler implements SheetWriteHandler {
+
+    @Override
+    public void afterSheetCreate(SheetWriteHandlerContext context) {
+        log.info("第{}个Sheet写入成功。", context.getWriteSheetHolder().getSheetNo());
+
+        // 设置验证生效的范围，四个参数分别为：起始行，终止行，起始列，终止列
+        CellRangeAddressList cellRangeAddressList = new CellRangeAddressList(1, 10, 1, 1);
+        DataValidationHelper helper = context.getWriteSheetHolder().getSheet().getDataValidationHelper();
+        // 设置验证方式
+        DataValidationConstraint constraint = helper.createDateConstraint(DataValidationConstraint.OperatorType.BETWEEN,
+            "Date(1900, 1, 1)", "Date(2999, 12, 31)", "yyyy-MM-dd");
+
+        // 创建验证对象
+        DataValidation dataValidation = helper.createValidation(constraint, cellRangeAddressList);
+        // 错误提示信息
+        dataValidation.createErrorBox("提示","请输入正确格式日期[yyyy-MM-dd]");
+        dataValidation.setShowErrorBox(true);
+        context.getWriteSheetHolder().getSheet().addValidationData(dataValidation);
+    }
+}

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

@@ -704,6 +704,25 @@ public class WriteTest {
         EasyExcel.write(fileName).head(head()).sheet("模板").doWrite(dataList());
     }
 
+    /**
+     * 数据验证自定义拦截器
+     * <p>
+     * 对日期标题列进行数据验证，如果格式不为yyyy-MM-dd则提示输入错误
+     * <p>
+     * 1. 创建excel对应的实体对象 参照{@link DemoData}
+     * <p>
+     * 2. 注册拦截器 {@link DataValidationSheetWriteHandler}
+     * <p>
+     * 3. 直接写即可
+     */
+    @Test
+    public void DataValidationHandlerWrite() {
+        String fileName = TestFileUtil.getPath() + "customHandlerWrite" + System.currentTimeMillis() + ".xlsx";
+        // 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, DemoData.class).registerWriteHandler(new DataValidationSheetWriteHandler())
+            .sheet("模板").doWrite(new ArrayList<>());
+    }
+
     private List<LongestMatchColumnWidthData> dataLong() {
         List<LongestMatchColumnWidthData> list = ListUtils.newArrayList();
         for (int i = 0; i < 10; i++) {