java導出數據到excel

1.導入maven
!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.15</version>
    <scope>compile</scope>
</dependency>

2.導出excel方法
public void exportExcel(HttpServletResponse response, Searchable search){

        //查出檢驗項目
        Master master = masterService.findOne(search);
        //查出檢驗項目的結果集合
        List<Result> list = findListWithSort(search);
        //創建HSSFWorkbook對象(excel的文檔對象)
        HSSFWorkbook wb = new HSSFWorkbook();

        //建立新的sheet對象（excel的表單）
        HSSFSheet sheet = wb.createSheet("檢驗結果表");

        //在sheet里創建第一行，參數為行索引(excel的行)，可以是0～65535之間的任何一個
        HSSFRow row1 = sheet.createRow(0);
        //創建單元格（excel的單元格，參數為列索引，可以是0～255之間的任何一個
        HSSFCell cell = row1.createCell(0);
        //設置單元格內容
        cell.setCellValue(master.getItemName() + "檢驗報告單");
        //合並單元格CellRangeAddress構造參數依次表示起始行，截至行，起始列， 截至列
        sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 5));
        //在sheet里創建第二行
        HSSFRow row2 = sheet.createRow(1);
        /*HSSFCell cell1 = row2.createCell(0);
        HSSFCell cell2 = row2.createCell(1);
        HSSFCell cell3 = row2.createCell(2);
        HSSFCell cell4 = row2.createCell(3);
        HSSFCell cell5 = row2.createCell(4);
        HSSFCell cell6 = row2.createCell(5);
        //設置列寬
        sheet.setColumnWidth( cell1.getColumnIndex(),256 * 25);
        sheet.setColumnWidth( cell2.getColumnIndex(),256 * 20);
        sheet.setColumnWidth( cell3.getColumnIndex(),256 * 20);
        sheet.setColumnWidth( cell4.getColumnIndex(),256 * 20);
        sheet.setColumnWidth( cell5.getColumnIndex(),256 * 20);
        sheet.setColumnWidth( cell6.getColumnIndex(),256 * 20);*/
        //設置缺省列寬
        sheet.setDefaultColumnWidth(20);
        //設置缺省列高
        sheet.setDefaultRowHeightInPoints(30);
        //創建單元格並設置單元格內容
        row2.createCell(0).setCellValue("報告日期");

        HSSFCellStyle style = wb.createCellStyle();
        // 實例化樣式對象
        row2.createCell(1).setCellValue("報告項目名稱");
        // 垂直居中
        style.setAlignment(HorizontalAlignment.CENTER);
        //將樣式應用到行
        cell.setCellStyle(style);


        row2.createCell(2).setCellValue("結果");

        row2.createCell(3).setCellValue("單位");

        row2.createCell(4).setCellValue("異常");

        row2.createCell(5).setCellValue("正常參考值");

        for (int i = 0; i < list.size(); i++) {
            HSSFRow rows = sheet.createRow(i + 2);

            rows.createCell(0).setCellValue(DateUtil.formatDateTime(list.get(i).getResultDateTime()));
            rows.createCell(1).setCellValue(list.get(i).getReportItemName());
            rows.createCell(2).setCellValue(list.get(i).getResult());
            rows.createCell(3).setCellValue(list.get(i).getUnits());
            rows.createCell(4).setCellValue(list.get(i).getNormalIndicator());
            rows.createCell(5).setCellValue(list.get(i).getReferenceRange());
        }
        try {
            String fileName = new String((master.getItemName() + ".xls").getBytes(), "ISO8859-1");
            response.setContentType("application/octet-stream;charset=ISO8859-1");
            response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
            response.addHeader("Pargam", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
            OutputStream os = response.getOutputStream();

            wb.write(os);
            os.flush();
            os.close();
        } catch (Exception var8) {
            throw new ServiceException("導出excel發生異常", var8);
        }

    }