POI 3.17使用笔记

1.新建springboot项目

2.导入POI相关maven依赖

   org.apache.poi
   poi
   3.17


   org.apache.poi
   poi-ooxml
   3.17



   org.apache.poi
   poi-ooxml-schemas
   3.17

 

3.导出excel（excel的创建，单元格字体样式，单元格宽高）

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全文检索测试类
 * Created by Administrator on 2018/7/10.
 */
public class LuceneTestController {

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

        //合并单元格
        sheet.addMergedRegion(new CellRangeAddress(0, 2, 0, 5));

        //设置第一列单元格宽度
        sheet.setColumnWidth(0,100*100);
        //设置第二列单元格宽度
        sheet.setColumnWidth(1,100*100);

        //创建第一行
        HSSFRow row0 = sheet.createRow(0);

        //创建第二行
        HSSFRow row1 = sheet.createRow(1);
        //设置第一行单元格高度
        row0.setHeight((short) 400);

        //创建第一行第一列单元格
        HSSFCell cell0_1 = row0.createCell(0);

        //创建第二行第一列单元格
        HSSFCell cell0_2 = row1.createCell(0);

        //设置单元格的值
        cell0_1.setCellValue("项目施工进度管理系统");

        //改变字体样式，步骤
        HSSFFont hssfFont = wb.createFont();

        //设置字体,红色
        hssfFont.setColor(HSSFFont.COLOR_RED);

        //字体粗体显示
        hssfFont.setBold(true);

        hssfFont.setFontName("宋体");

        // 字体大小
        hssfFont.setFontHeightInPoints((short) 22);

        //设置样式
        HSSFCellStyle cellStyle = wb.createCellStyle();
        cellStyle.setFont(hssfFont);

        //设置单元格背景色
        cellStyle.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.getIndex());
        cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);

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

        //设置边框
        cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
        cellStyle.setBorderLeft(BorderStyle.DASH_DOT_DOT);//左边框
        cellStyle.setBorderTop(BorderStyle.THIN);//上边框
        cellStyle.setBorderRight(BorderStyle.THIN);//右边框

        //3.单元格使用样式，设置第一行第一列单元格样式
        cell0_1.setCellStyle(cellStyle);
        cell0_2.setCellStyle(cellStyle);
        //生成excel文件
        FileOutputStream fileOut = new FileOutputStream("e:\\"+System.currentTimeMillis()+".xls");
        wb.write(fileOut);
        fileOut.close();
        /* struts导出excel，前端需要是提交form形式，否则，点击导出不会弹出框
              HSSFWorkbook wb = exportExcel(projectId, blockId, buildingId,buildingCode);
             // 生成excel文件
             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();
         */
    }
}