工作臺

需求分析

Apache POI

介紹

入門案例

package com.sky.test;

import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.File;
import java.io.FileOutputStream;

/**
 * 使用POI操作excel文件
 */
public class POITest {
    /**
     * 通過POI創(chuàng)建excel文件并寫入文件內(nèi)容
     */
    public static void write() throws Exception{
        //在內(nèi)存中創(chuàng)建excel文件
        XSSFWorkbook excel = new XSSFWorkbook();
        //在excel文件中創(chuàng)建sheet頁
        XSSFSheet sheet = excel.createSheet("info");
        //在sheet中創(chuàng)建行對象  rownum編號是從0開始的
        XSSFRow row = sheet.createRow(1);
        //在行上面創(chuàng)建單元格 并寫入文件內(nèi)容
        row.createCell(1).setCellValue("姓名");
        //這一句和上一句相當于在第二行的第二格與第三格 寫入信息
        row.createCell(2).setCellValue("城市");
        //創(chuàng)建一個新行
        row = sheet.createRow(2);
        row.createCell(1).setCellValue("張三");
        row.createCell(2).setCellValue("北京");
        row = sheet.createRow(3);
        row.createCell(1).setCellValue("李四");
        row.createCell(2).setCellValue("南京");
        //通過輸出流將內(nèi)存中的excel文件寫出到磁盤
        FileOutputStream out = new FileOutputStream(new File("D:\\info.xlsx"));
        excel.write(out);
        //關閉資源
        out.close();
        excel.close();

    }

    public static void main(String[] args) throws Exception{
            write();

    }
}

結(jié)果

    public static void  read() throws Exception{
        FileInputStream inputStream = new FileInputStream(new File("D:\\info.xlsx"));
        //讀取磁盤上已存放的excel文件
        XSSFWorkbook excel = new XSSFWorkbook(inputStream);
        //讀取excel文件中的第一個sheet頁
        XSSFSheet sheet = excel.getSheet("info");
        //獲取最后一行的行號
        int lastRowNum = sheet.getLastRowNum();
        for (int i = 1;i <= lastRowNum; i++){
            //獲得某一行
            XSSFRow row = sheet.getRow(i);
            //獲得單元格對象
            String cellValue1 = row.getCell(1).getStringCellValue();
            String cellValue2 = row.getCell(2).getStringCellValue();
            System.out.println(cellValue1 + "   " + cellValue2);
        }
        //關閉資源
        excel.close();
        inputStream.close();
            public static void main(String[] args) throws Exception{
//            write();
            read();
    }
    }

導出運營數(shù)據(jù)Excel報表

需求分析

代碼開發(fā)

Controller層

    /**
     * 導出運營數(shù)據(jù)報表
     * @param response
     */
    @GetMapping("/export")
    @ApiOperation("導出運營數(shù)據(jù)報表")
    public void export(HttpServletResponse response){
        reportService.exportBusinessData(response);
    }

Service實現(xiàn)類文章來源地址http://www.zghlxwxcb.cn/news/detail-823174.html

   /**
     * 導出運營數(shù)據(jù)報表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1、查詢數(shù)據(jù)庫獲得營業(yè)數(shù)據(jù)--查詢最近30天數(shù)據(jù)
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查詢概覽數(shù)據(jù)
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2、通過POI將數(shù)據(jù)寫入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/運營數(shù)據(jù)報表模板.xlsx");

        try {
            //基于已有模板文件創(chuàng)建一個新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //填充數(shù)據(jù)--時間
            XSSFSheet sheet1 = excel.getSheet("sheet1");
            sheet1.getRow(1).getCell(1).setCellValue("時間:" + dateBegin + "至" + dateEnd);
            //獲得第四行
            sheet1.getRow(3).getCell(2).setCellValue(businessDataVO.getTurnover());
            sheet1.getRow(3).getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            sheet1.getRow(3).getCell(6).setCellValue(businessDataVO.getNewUsers());
            //獲得第五行
            XSSFRow row = sheet1.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            //填充明細數(shù)據(jù)
            for (int i = 0; i <30 ; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查詢某一天的營業(yè)數(shù)據(jù)
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //獲得某一行
                row = sheet1.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //3、通過輸出流將excel文件下載到客戶端瀏覽器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //關閉資源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

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