动态列excel

 iailab-framework/iailab-common-excel/src/main/java/com/iailab/framework/excel/core/util/ExcelUtils.java

@@ -1,5 +1,7 @@
package com.iailab.framework.excel.core.util;

import com.alibaba.excel.EasyExcelFactory;
import com.alibaba.excel.write.handler.AbstractRowWriteHandler;
import com.iailab.framework.excel.core.handler.SelectSheetWriteHandler;
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.converters.longconverter.LongStringConverter;
@@ -10,6 +12,7 @@
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/**
@@ -36,7 +39,7 @@
        EasyExcel.write(response.getOutputStream(), head)
                .autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
                .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()) // 基于 column 长度，自动适配。最大 255 宽度
                .registerWriteHandler(new SelectSheetWriteHandler(head,false)) // 基于固定 sheet 实现下拉框
                .registerWriteHandler(new SelectSheetWriteHandler(head, false)) // 基于固定 sheet 实现下拉框
                .registerConverter(new LongStringConverter()) // 避免 Long 类型丢失精度
                .sheet(sheetName).doWrite(data);
        // 设置 header 和 contentType。写在最后的原因是，避免报错时，响应 contentType 已经被修改了
@@ -56,11 +59,33 @@
        EasyExcel.write(response.getOutputStream(), head)
                .autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
                .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()) // 基于 column 长度，自动适配。最大 255 宽度
                .registerWriteHandler(new SelectSheetWriteHandler(head,selectFlag)) // 基于固定 sheet 实现下拉框
                .registerWriteHandler(new SelectSheetWriteHandler(head, selectFlag)) // 基于固定 sheet 实现下拉框
                .registerConverter(new LongStringConverter()) // 避免 Long 类型丢失精度
                .sheet(sheetName).doWrite(data);
        // 设置 header 和 contentType。写在最后的原因是，避免报错时，响应 contentType 已经被修改了
        response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, StandardCharsets.UTF_8.name()));
        response.setContentType("application/vnd.ms-excel;charset=UTF-8");
    }

    public static void write(HttpServletResponse response, String filename, String sheetName,
                             List<String> column, List<List<Object>> data) throws IOException {

        List<List<String>> head = new ArrayList<>();
        if (column != null && column.size() > 0) {
            for (String columnName : column) {
                List<String> item = new ArrayList<>();
                item.add(columnName);
                head.add(item);
            }
        }

        EasyExcelFactory.write(response.getOutputStream())
                .head(head)
                // handle
                .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
                .sheet(sheetName).doWrite(data);
        // 设置 header 和 contentType。写在最后的原因是，避免报错时，响应 contentType 已经被修改了
        response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, StandardCharsets.UTF_8.name()));
        response.setContentType("application/vnd.ms-excel;charset=UTF-8");
    }
}