hutools寫出excel

hutools寫出excel

引入依賴

        <!--hutool 工具包-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.22</version>
        </dependency>
        <!--poi-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>

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示例代碼

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.date.DateUtil;
import cn.hutool.poi.excel.BigExcelWriter;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.style.StyleUtil;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.VerticalAlignment;

import java.util.List;

public class ExcelDemo {

    public static void main(String[] args) {
        //構建數據
        List<?> row1 = CollUtil.newArrayList("aa", "bb", "cc", "dd", DateUtil.date(), 3.22676575765d);
        List<?> row2 = CollUtil.newArrayList("aa1", "bb1", "cc1", "dd1", DateUtil.date(), 250.7676d);
        List<?> row3 = CollUtil.newArrayList("aa2", "bb2", "cc2", "dd2", DateUtil.date(), 0.111d);
        List<?> row4 = CollUtil.newArrayList("aa3", "bb3", "cc3", "dd3", DateUtil.date(), 35d);
        List<?> row5 = CollUtil.newArrayList("aa4", "bb4", "cc4", "dd4", DateUtil.date(), 28.00d);
        List<List<?>> rows = CollUtil.newArrayList(row1, row2, row3, row4, row5);

        List<String> headRow = CollUtil.newArrayList("列1", "列2", "列3", "列4", "時間", "數字");

        String fileName = "D:\\示例.xlsx";
        BigExcelWriter writer = ExcelUtil.getBigWriter(fileName);

        //設置內容字體
        Font font = writer.createFont();
        font.setBold(true);
        font.setColor(Font.COLOR_RED);
        font.setItalic(true);

        //默認單元格樣式
        CellStyle defauleStyle = writer.getCellStyle();
        defauleStyle.setFont(font);

        //頭部樣式
        CellStyle headStyle = writer.getHeadCellStyle();
        StyleUtil.setColor(headStyle, IndexedColors.BLUE, FillPatternType.SOLID_FOREGROUND);

        //數字樣式
        CellStyle numberStyle = writer.getStyleSet().getCellStyleForNumber();
        StyleUtil.setColor(numberStyle, IndexedColors.RED, FillPatternType.SOLID_FOREGROUND);
        StyleUtil.setAlign(numberStyle, HorizontalAlignment.RIGHT, VerticalAlignment.CENTER);

        //日期樣式
        CellStyle dateStyle = writer.getStyleSet().getCellStyleForDate();
        StyleUtil.setColor(dateStyle, IndexedColors.DARK_YELLOW, FillPatternType.SOLID_FOREGROUND);

        //寫入表頭
        writer.writeHeadRow(headRow);

        // 一次性寫出內容，使用默認樣式
        rows.forEach(k -> {
            writer.writeRow(k);
        });
        // 關閉writer，釋放內存
        writer.close();
    }

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其他記錄

行乘列限制

• excel 2003版本 單sheet最大 65536*256
• excel 2007以上版本 單sheet最大 1048576*16384

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臨時文件占用系統緩存目錄

說明：hutool的excel工具包通過封裝poi包提供處理excel的功能
使用SXSSFWorkbook因需要緩存大量數據，又不能占內存，需要生成臨時文件

• windows下：AppData\Local\Temp\poifiles文件夾下，生成一個叫poi-sxssf-sheet**************的文件
• Linux系統下：會在/tmp/poifiles文件下生成該臨時文件