1.新建springboot專案

2.匯入POI相關maven依賴

<!--poi-->
<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi</artifactId>
   <version>3.17</version>
</dependency>
<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>
 

3.匯出excel（excel的建立，單元格字型樣式，單元格寬高）

package lucene;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import java.io.FileOutputStream;

/**
 * lucene全文檢索測試類
 * Created by Administrator on 2018/7/10.
 */
public class LuceneTestController {

    //poi匯出excel
    public void exportExcel() throws Exception{
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("sheet name");

        //合併單元格
        sheet.addMergedRegion(new CellRangeAddress(0, 2, 0, 5));

        //設定第一列單元格寬度
        sheet.setColumnWidth(0,100*100);
        //設定第二列單元格寬度
        sheet.setColumnWidth(1,100*100);

        //建立第一行
        HSSFRow row0 = sheet.createRow(0);

        //建立第二行
        HSSFRow row1 = sheet.createRow(1);
        //設定第一行單元格高度
        row0.setHeight((short) 400);

        //建立第一行第一列單元格
        HSSFCell cell0_1 = row0.createCell(0);

        //建立第二行第一列單元格
        HSSFCell cell0_2 = row1.createCell(0);

        //設定單元格的值
        cell0_1.setCellValue("專案施工進度管理系統");

        //改變字型樣式，步驟
        HSSFFont hssfFont = wb.createFont();

        //設定字型,紅色
        hssfFont.setColor(HSSFFont.COLOR_RED);

        //字型粗體顯示
        hssfFont.setBold(true);

        hssfFont.setFontName("宋體");

        // 字型大小
        hssfFont.setFontHeightInPoints((short) 22);

        //設定樣式
        HSSFCellStyle cellStyle = wb.createCellStyle();
        cellStyle.setFont(hssfFont);

        //設定單元格背景色
        cellStyle.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.getIndex());
        cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);

        //設定居中
        cellStyle.setAlignment(HorizontalAlignment.CENTER);//水平居中
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中

        //設定邊框
        cellStyle.setBorderBottom(BorderStyle.THIN); //下邊框
        cellStyle.setBorderLeft(BorderStyle.DASH_DOT_DOT);//左邊框
        cellStyle.setBorderTop(BorderStyle.THIN);//上邊框
        cellStyle.setBorderRight(BorderStyle.THIN);//右邊框

        //3.單元格使用樣式，設定第一行第一列單元格樣式
        cell0_1.setCellStyle(cellStyle);
        cell0_2.setCellStyle(cellStyle);
        //生成excel檔案
        FileOutputStream fileOut = new FileOutputStream("e:\\"+System.currentTimeMillis()+".xls");
        wb.write(fileOut);
        fileOut.close();
        /* struts匯出excel，前端需要是提交form形式，否則，點選匯出不會彈出框
              HSSFWorkbook wb = exportExcel(projectId, blockId, buildingId,buildingCode);
             // 生成excel檔案
             String fileName = String.valueOf(Calendar.getInstance().getTimeInMillis()).concat(".xls");
             // 清空response
             this.getResponse().reset();
             this.getResponse().addHeader("Content-Disposition","attachment;filename=" + new                              String(fileName.getBytes()));
             this.getResponse().setContentType("application/vnd.ms-excel;charset=utf-8");
             OutputStream os = this.getResponse().getOutputStream();
             wb.write(os);
             if (os != null) {
             os.close();
             os = null;
             }
             wb.close();
         */
    }
}