Java POI导出excel

最新推荐文章于 2022-10-13 12:27:27 发布

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这篇博客详细介绍了如何在Java项目中使用POI库来导出Excel文件，强调了依赖版本一致性的重要性，提醒开发者避免因版本不匹配导致的问题。

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package com.dajie.notice.util;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import com.dajie.notice.controller.me.MeExportController;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 多功能excel导出
 *
 * @author kangzhuang
 * @ClassName: PoiExportExcel.java
 * @Description:
 */
public class PoiExportComplexExcel {
    /**
     * 日志
     */
    private static final Logger logger = LoggerFactory.getLogger(MeExportController.class);
    //导出表名
    private String fileName;
    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName;
    //定义导出数据集合
    private List<Object[]> dataList = new ArrayList<Object[]>();
    HttpServletResponse response;

    //构造方法，传入要导出的数据
    public PoiExportComplexExcel(String fileName, String title, String[] rowName,
                                 List<Object[]> dataList, HttpServletResponse response) {
        this.fileName = fileName;
        this.title = title;
        if (rowName == null) {
            this.rowName = new String[0];
        } else {
            this.rowName = Arrays.copyOf(rowName, rowName.length);
        }
        this.dataList = dataList;
        this.response = response;
    }

    /**
     * 创建excel
     *
     * @param workbook
     */
    private void createExcel(SXSSFWorkbook workbook) throws Exception {
        logger.info("PoiExportComplexExcel  createExcel start fileName:{}",fileName);
        Sheet sheet = workbook.createSheet(title);                    // 创建工作表
        CellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
        CellStyle style = this.getStyle(workbook);                    //单元格样式对象

        int columnNum = rowName.length;                                // 定义所需列数
        Row rowRowName = sheet.createRow(0);                        // 在索引0的位置创建行(最顶端的行开始的第0行)
        // 将列头设置到sheet的单元格中
        for (int n = 0; n < columnNum; n++) {
            Cell cellRowName = rowRowName.createCell(n);            //创建列头对应个数的单元格
            cellRowName.setCellType(Cell.CELL_TYPE_STRING);            //设置列头单元格的数据类型
            RichTextString text = new XSSFRichTextString(rowName[n]);
            cellRowName.setCellValue(text);                                //设置列头单元格的值
            cellRowName.setCellStyle(columnTopStyle);                    //设置列头单元格样式
        }
        //将查询出的数据设置到sheet对应的单元格中
        for (int i = 0; i < dataList.size(); i++) {
            Object[] obj = dataList.get(i);                    //遍历每个对象
            Row row = sheet.createRow(i + 1);                                //创建所需的行数
            for (int j = 0; j < obj.length; j++) {
                Cell cell_col = null;                                    //设置单元格的数据类型
                cell_col = row.createCell(j, Cell.CELL_TYPE_STRING);        //带序号j+1
                //防止.toString()时此处报空指针异常
                if (obj[j] == null) {
                    cell_col.setCellValue("");//设置单元格的值
                } else {
                    cell_col.setCellValue(obj[j].toString());//设置单元格的值
                }
                cell_col.setCellStyle(style);                        //设置单元格样式
            }
        }
        //让列宽随着导出的列长自动适应
        for (int colNum = 0; colNum < columnNum; colNum++) {
            int columnWidth = sheet.getColumnWidth(colNum) / 256;
            for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                Row currentRow;
                //当前行未被使用过
                if (sheet.getRow(rowNum) == null) {
                    currentRow = sheet.createRow(rowNum);
                } else {
                    currentRow = sheet.getRow(rowNum);
                }
                if (currentRow.getCell(colNum) != null) {
                    Cell currentCell = currentRow.getCell(colNum);
                    if (currentCell.getRichStringCellValue() != null) {
                        columnWidth = currentCell.getStringCellValue().getBytes().length;            // 设置每列的宽度
                    }
                }
            }
            if (colNum == 0) {
                sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
            } else {
                sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
            }
        }
    }

    /**
     * 导出单个xlsx
     *
     * @throws Exception
     */
    public void export() {

        logger.info("PoiExportComplexExcel  export start");
        OutputStream out = null;
        // SXSSFWorkbook为POI专门处理大数据量的，并且可以解决使用XSSFWorkbook内存溢出问题。
        // 创建工作簿对象（需要初始化导出数据量）
        SXSSFWorkbook workbook = new SXSSFWorkbook(dataList.size() + 1);
        try {
            this.createExcel(workbook);
            if (workbook != null) {
                fileName = new String(fileName.getBytes("utf-8"), "ISO8859-1") + ".xlsx";
                String headStr = "attachment; filename=\"" + fileName + "\"";
                response.setContentType("APPLICATION/OCTET-STREAM");
                response.setHeader("Content-Disposition", headStr);
                out = response.getOutputStream();
                workbook.write(out);
                out.flush();
            }

        } catch (IOException e) {
            logger.error("export IOException:", e);
        } catch (Exception e) {
            logger.error("export Exception:", e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (workbook != null) {
                    workbook.close();
                }
            } catch (IOException e) {
                logger.error("export IOException:", e);
            }
        }

    }

    /*
     * 列头单元格样式
     */
    public CellStyle getColumnTopStyle(SXSSFWorkbook workbook) {

        // 设置字体
        Font font = workbook.createFont();
        //字体加粗
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        CellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(CellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(CellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(CellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(CellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(CellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);

        return style;
    }

    /*
     * 列数据信息单元格样式
     */
    public CellStyle getStyle(SXSSFWorkbook workbook) {

        // 设置字体
        Font font = workbook.createFont();
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        CellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(CellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(CellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(CellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(CellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(CellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);

        return style;
    }
}

引入的依赖:

注意:版本号一定要一致,不然你会遇到神坑!

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.14</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.14</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml-schemas</artifactId>
    <version>3.14</version>
</dependency>