java导出功能（多级表头，复杂表头）

java导出功能（多级表头，复杂表头）

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前言

大概内容：

多级表头，复杂表头的导出功能都可以仿照这个例子去编写

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提示：以下是本篇文章正文内容，下面案例可供参考

一、实现的效果

二、调用工具类

业务层调用

	//假设这是需要导出的数据
   List<MonitorFoldLineTable> data = new ArrayList();
   //调用导出工具类
   FileExportUtil.testExcelDemo(data,response);

对应的实体类

public class MonitorFoldLineTable {

    private String cdbh;
    
    private String sd;

    private Double dcsg;

    private Double dcdsf;

    private Double dcc;

    private Double ljsg;

    private Double ljdsf;

    private Double ljc;;

    private Double bxsg;

    private Double bxdsf;

    private Double bxc;

    private String time;
}

三、详细工具类

直接copy改吧改吧就可以使用，有详细注释

import com.iS3.manager.monitoring.domain.vo.MonitorFoldLineTable;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.usermodel.*;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 *
 * @Author: 杨永卓
 * @Date: 2022/07/21/8:58
 * @Description:
 */
public class FileExportUtil {

    /**
     * @param list 需要写入excel的数据 从数据库或者其他途径读取
     * @Description: 导出监测对比数据的工具类
     * @return:
     * @Author: 杨永卓
     * @Date: 2022/7/25 9:29
     */
    public static void testExcelDemo(List<MonitorFoldLineTable> list, HttpServletResponse response) {
        /** 第一步，创建一个Workbook，对应一个Excel文件  */
        XSSFWorkbook wb = new XSSFWorkbook();
        /** 第二步，在Workbook中添加一个sheet,对应Excel文件中的sheet  */
        XSSFSheet sheet = wb.createSheet("excel导出标题");
        /** 第三步，设置样式以及字体样式*/
        XSSFCellStyle titleStyle = createTitleCellStyle(wb);
        XSSFCellStyle headerStyle = createHeadCellStyle(wb);
        XSSFCellStyle contentStyle = createContentCellStyle(wb);
        /** 第四步，创建标题 ,合并标题单元格 */
        // 行号
        int rowNum = 0;
        // 创建第一页的第一行，索引从0开始
        XSSFRow row0 = sheet.createRow(rowNum++);
        row0.setHeight((short) 600);// 设置行高

        String[] row_Text = {"测点编号", "深度", "单次变化量", "", "", "累计变化量", "", "", "变形速率", "", "", "监测时间"};
         for (int i = 0; i < row_Text.length; i++) {
             XSSFCell c00 = row0.createCell(i);
             c00.setCellValue(row_Text[i]);
             c00.setCellStyle(headerStyle);
         }
         // 合并单元格，参数依次为起始列，结束列，起始行，结束行 （索引0开始）
         sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 0));
         sheet.addMergedRegion(new CellRangeAddress(0, 1, 1, 1));
         sheet.addMergedRegion(new CellRangeAddress(0, 0, 2, 4));
         sheet.addMergedRegion(new CellRangeAddress(0, 0, 5, 7));
         sheet.addMergedRegion(new CellRangeAddress(0, 0, 8, 10));
         sheet.addMergedRegion(new CellRangeAddress(0, 1, 11, 11));         
         //第二行
         XSSFRow row2 = sheet.createRow(rowNum++);
         row2.setHeight((short) 700);
         String[] row_third = {"", "", "施工监测", "第三方监测", "前后差值", "施工监测", "第三方监测", "前后差值", "施工监测", "第三方监测", "前后差值"};
         for (int i = 0; i < row_third.length; i++) {
             XSSFCell tempCell = row2.createCell(i);
             tempCell.setCellValue(row_third[i]);
             tempCell.setCellStyle(headerStyle);
         }


        for (MonitorFoldLineTable value : list) {
  
            XSSFRow tempRow = sheet.createRow(rowNum++);
            tempRow.setHeight((short) 500);
            // 循环单元格填入数据
            for (int j = 0; j < (0 == type ? 12 : 11); j++) {
                //列宽自适应，j为自适应的列，true就是自适应，false就是不自适应，默认不自适应
                sheet.autoSizeColumn(j, true);
                XSSFCell tempCell = tempRow.createCell(j);
                tempCell.setCellStyle(contentStyle);
                String tempValue = "";
                    switch (j) {
                        case 0:
                            tempValue = value.getCdbh();
                            break;
                        case 1:
                            tempValue = value.getSd();
                            break;
                        case 2:
                            tempValue = value.getDcsg().toString();
                            break;
                        case 3:
                            tempValue = value.getDcdsf().toString();
                            break;
                        case 4:
                            tempValue = value.getDcc().toString();
                            break;
                        case 5:
                            tempValue = value.getLjsg().toString();
                            break;
                        case 6:
                            tempValue = value.getLjdsf().toString();
                            break;
                        case 7:
                            tempValue = value.getLjc().toString();
                            break;
                        case 8:
                            tempValue = value.getBxsg().toString();
                            break;
                        case 9:
                            tempValue = value.getBxdsf().toString();
                            break;
                        case 10:
                            tempValue = value.getBxc().toString();
                            break;
                        case 11:
                            tempValue = value.getTime();
                            break;
                    }
                    tempCell.setCellValue(tempValue);
            }
        }
        //导出到浏览器下载
        buildExcelDocument("监测数据", wb, response);
    }

    /**
     * @Description: [导出到浏览器]
     * @Param: [fileName, wb, response]
     * @return: void
     * @Author: 杨永卓
     * @Date: 2022/7/25 9:40
     */
    private static void buildExcelDocument(String fileName, Workbook wb, HttpServletResponse response) {
        try {
            response.setContentType("application/octet-stream");
            // 可自行定义编码格式
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
            //清除jsp编译html文件的空白,防止excel出现空行
            response.flushBuffer();
            //写出
            wb.write(response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(wb);
        }
    }
//---------------------------------------以下是封装的样式-----------------------------

    /**
     * 创建标题样式
     *
     * @param wb
     * @return
     */
    private static XSSFCellStyle createTitleCellStyle(XSSFWorkbook wb) {
        XSSFCellStyle cellStyle = wb.createCellStyle();
        cellStyle.setAlignment(HorizontalAlignment.CENTER);//水平居中
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//垂直对齐
        cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
//        cellStyle.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.getIndex());//背景颜色

        XSSFFont headerFont1 = (XSSFFont) wb.createFont(); // 创建字体样式
        headerFont1.setBold(true); //字体加粗
        headerFont1.setFontName("黑体"); // 设置字体类型
        headerFont1.setFontHeightInPoints((short) 15); // 设置字体大小
        cellStyle.setFont(headerFont1); // 为标题样式设置字体样式
        return cellStyle;
    }

    /**
     * 创建表头样式
     *
     * @param wb
     * @return
     */
    private static XSSFCellStyle createHeadCellStyle(XSSFWorkbook wb) {
        XSSFCellStyle cellStyle = wb.createCellStyle();
        cellStyle.setWrapText(true);// 设置自动换行
        cellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());//背景颜色
        cellStyle.setAlignment(HorizontalAlignment.CENTER); //水平居中
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER); //垂直对齐
        cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
//        cellStyle.setBottomBorderColor(IndexedColors.BLACK.index);
        cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
        cellStyle.setBorderLeft(BorderStyle.THIN); //左边框
        cellStyle.setBorderRight(BorderStyle.THIN); //右边框
        cellStyle.setBorderTop(BorderStyle.THIN); //上边框

        XSSFFont headerFont = (XSSFFont) wb.createFont(); // 创建字体样式
        headerFont.setBold(true); //字体加粗
        headerFont.setFontName("黑体"); // 设置字体类型
        headerFont.setFontHeightInPoints((short) 12); // 设置字体大小
        cellStyle.setFont(headerFont); // 为标题样式设置字体样式

        return cellStyle;
    }

    /**
     * 创建内容样式
     *
     * @param wb
     * @return
     */
    private static XSSFCellStyle createContentCellStyle(XSSFWorkbook wb) {
        XSSFCellStyle cellStyle = wb.createCellStyle();
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中
        cellStyle.setAlignment(HorizontalAlignment.CENTER);// 水平居中
        cellStyle.setWrapText(true);// 设置自动换行
        cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
        cellStyle.setBorderLeft(BorderStyle.THIN); //左边框
        cellStyle.setBorderRight(BorderStyle.THIN); //右边框
        cellStyle.setBorderTop(BorderStyle.THIN); //上边框

        // 生成12号字体
        XSSFFont font = wb.createFont();
        font.setColor((short) 8);
        font.setFontHeightInPoints((short) 12);
        cellStyle.setFont(font);

        return cellStyle;
    }
}

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