Java Poi导出Excel工具类型

直接上代码：


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

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;

public class ExportExcel {
    
    

    // 显示的导出表的标题
    private String title;
    // 导出表的列名
    private String[] rowName;
    private List<Object[]> dataList = new ArrayList<Object[]>();

    // 构造函数，传入要导出的数据
    public ExportExcel(String title, String[] rowName, List<Object[]> dataList) {
    
    
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
    }

    // 导出数据
    public void export(OutputStream out) throws Exception {
    
    
        try {
    
    
            HSSFWorkbook workbook = new HSSFWorkbook();
            HSSFSheet sheet = workbook.createSheet(title);

            // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTitle = rowm.createCell(0);


            //sheet样式定义【】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);
            HSSFCellStyle style = this.getStyle(workbook);
            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
            cellTitle.setCellStyle(columnTopStyle);
            cellTitle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(2);

            // 将列头设置到sheet的单元格中
            for (int n = 0; n < columnNum; n++) {
    
    
                HSSFCell cellRowName = rowRowName.createCell(n);
                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);
                cellRowName.setCellStyle(columnTopStyle);

            }
            // 将查询到的数据设置到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
                HSSFRow row = sheet.createRow(i + 3);// 创建所需的行数

                for (int j = 0; j < obj.length; j++) {
    
    
                    HSSFCell cell = null;
                    if (j == 0) {
    
    
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i + 1);
                    } else {
    
    
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
                        if (!"".equals(obj[j]) && obj[j] != null) {
    
    
                            cell.setCellValue(obj[j].toString());
                        }
                    }
                    cell.setCellStyle(style);

                }

            }

            // 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++) {
    
    
                    HSSFRow currentRow;
                    if (sheet.getRow(rowNum) == null) {
    
    
                        currentRow = sheet.createRow(rowNum);
                    } else {
    
    
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
    
    
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
    
    
                            int length = currentCell.getStringCellValue().getBytes().length;
                            if (columnWidth < length) {
    
    
                                columnWidth = length;
                            }
                        }
                    }
                }
                if (colNum == 0) {
    
    
                    sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
                } else {
    
    
                    sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
                }
            }

            if (workbook != null) {
    
    
                try {
    
    

                    workbook.write(out);

                } catch (Exception e) {
    
    
                    e.printStackTrace();
                }
            }

        } catch (Exception e) {
    
    

        }
    }


    /*
     * 列头单元格样式
     */
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
    
    
        // 设置字体
        HSSFFont font = workbook.createFont();

        // 设置字体大小
        font.setFontHeightInPoints((short) 11);
        // 字体加粗
        font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        // 设置字体名字
        font.setFontName("Courier New");
        // 设置样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置低边框
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        // 设置低边框颜色
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        // 设置右边框
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        // 设置顶边框
        style.setTopBorderColor(HSSFColor.BLACK.index);
        // 设置顶边框颜色
        style.setTopBorderColor(HSSFColor.BLACK.index);
        // 在样式中应用设置的字体
        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(HSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        return style;

    }

    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
    
    
        // 设置字体
        HSSFFont font = workbook.createFont();
        // 设置字体大小
        font.setFontHeightInPoints((short) 10);
        // 字体加粗
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        // 设置字体名字
        font.setFontName("Courier New");
        // 设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置底边框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        // 设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        // 设置左边框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        // 设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        // 设置右边框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        // 设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        // 设置顶边框;
        style.setBorderTop(HSSFCellStyle.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(HSSFCellStyle.ALIGN_CENTER);
        // 设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        return style;
    }


}

使用示例：

    @RequestMapping("/export")
    public void dispose(HttpServletResponse response) throws IOException {
    
    
        //给文件命名。随机命名
        String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
        //告诉浏览器数据格式，将头和数据传到前台
        String headStr = "attachment; filename=\"" + fileName + "\"";
        response.setContentType("APPLICATION/OCTET-STREAM");
        response.setHeader("Content-Disposition", headStr);
        OutputStream out = response.getOutputStream();

        // 操作导出excel
        List<OutInfo> dataList = outInfoService.list();
        //excel标题
        String title = "信息2020-10-12";
        //excel列头信息
        String[] rowsName = new String[]{
    
    "违规视频", "违规截图", "违规项", "违规等级", "时间", "APP名称", "违规直播间网址", "主播信息", "APP所属公司", "触及关键词", "所属板块"};

        //调用poi的工具类
        ExportExcel ex = new ExportExcel(title, rowsName, HAUtils.objToList(dataList));
        try {
    
    
            ex.export(out);
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
        out.flush();
        out.close();
    }

所使用依赖包文件：

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.11</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.17</version>
        </dependency>

Java Poi导出Excel工具类型

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