feat(file/excel): 新增 Easy Excel List 集合转换器

continew-starter-file/continew-starter-file-excel/src/main/java/top/continew/starter/file/excel/converter/ExcelListConverter.java

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+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.continew.starter.file.excel.converter;
+
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.util.StrUtil;
+import com.alibaba.excel.converters.Converter;
+import com.alibaba.excel.enums.CellDataTypeEnum;
+import com.alibaba.excel.metadata.GlobalConfiguration;
+import com.alibaba.excel.metadata.data.ReadCellData;
+import com.alibaba.excel.metadata.data.WriteCellData;
+import com.alibaba.excel.metadata.property.ExcelContentProperty;
+import org.springframework.stereotype.Component;
+import top.continew.starter.core.constant.StringConstants;
+
+import java.util.List;
+
+/**
+ * Easy Excel List 集合转换器
+ *
+ * <p>
+ * 仅适合 List<基本类型> <=> xxx,xxx 转换
+ * </p>
+ *
+ * @author Charles7c
+ * @since 2.0.2
+ */
+@Component
+public class ExcelListConverter implements Converter<List> {
+
+    @Override
+    public Class supportJavaTypeKey() {
+        return List.class;
+    }
+
+    @Override
+    public CellDataTypeEnum supportExcelTypeKey() {
+        return CellDataTypeEnum.STRING;
+    }
+
+    @Override
+    public List convertToJavaData(ReadCellData<?> cellData,
+                                  ExcelContentProperty contentProperty,
+                                  GlobalConfiguration globalConfiguration) {
+        String stringValue = cellData.getStringValue();
+        return StrUtil.split(stringValue, StringConstants.COMMA);
+    }
+
+    @Override
+    public WriteCellData<Object> convertToExcelData(List value,
+                                                    ExcelContentProperty contentProperty,
+                                                    GlobalConfiguration globalConfiguration) {
+        WriteCellData<Object> writeCellData = new WriteCellData<>(CollUtil.join(value, StringConstants.COMMA));
+        writeCellData.setType(CellDataTypeEnum.STRING);
+        return writeCellData;
+    }
+}