對象生成excel表格

話不多說直接上代碼:

maven

        <!--操作excol表格-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.0.1</version>
        </dependency>

javaBean

@ToString
@Data
class User{
    String name;
    String sex;
    Integer age;
    String bir;
}

啓動類

//要寫入的對象
        Workbook workbook = ExcelWriter.exportData(users);
        // 以文件的形式輸出工作簿對象
        FileOutputStream fileOut = null;
        try {
        	//地址是我的桌面
            String exportFilePath = "C:\\Users\\StaryL\\Desktop\\write.xlsx";
            File exportFile = new File(exportFilePath);
            if (!exportFile.exists()) {
                exportFile.createNewFile();
            }
            //生成輸出流
            fileOut = new FileOutputStream(exportFilePath);
            //寫入數據
            workbook.write(fileOut);
            fileOut.flush();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                if (null != fileOut) {
                    fileOut.close();
                }
                if (null != workbook) {
                    workbook.close();
                }
            } catch (IOException e) {
                System.out.println("關閉輸出流時發生錯誤，錯誤原因：" + e.getMessage());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

創建excel對象

    /**
     * 生成Excel並寫入數據信息
     * @param users 數據列表
     * @return 寫入數據後的工作簿對象
     */
    public static Workbook exportData(List<User2> users) {
        // 生成xlsx的Excel
//        Workbook workbook = new SXSSFWorkbook();

        // 如需生成xls的Excel，請使用下面的工作簿對象，注意後續輸出時文件後綴名也需更改爲xls
        Workbook workbook = new HSSFWorkbook();

        // 生成Sheet表，寫入第一行的列頭
        Sheet sheet = buildDataSheet(workbook);
        //構建每行的數據內容
        int rowNum = 1;
        for (Iterator<User2> it = users.iterator(); it.hasNext(); ) {
            User2 user = it.next();
            if (user == null) {
                continue;
            }
            //輸出行數據
            Row row = sheet.createRow(rowNum++);
            //姓名
            row.createCell(0).setCellValue(user.getName());
            //年齡
            row.createCell(1).setCellValue(user.getAge());
            //所在城市
            row.createCell(2).setCellValue(user.getLocation());
            //職業
            row.createCell(3).setCellValue(user.getJob());
            //生日
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd");
            String format = simpleDateFormat.format(user.getBri());
            row.createCell(4).setCellValue(format);
        }
        return workbook;

    }

創建列頭

private static List<String> CELL_HEADS; //列頭

    static{
        // 類裝載時就載入指定好的列頭信息，如有需要，可以考慮做成動態生成的列頭
        CELL_HEADS = new ArrayList<>();
        CELL_HEADS.add("姓名");
        CELL_HEADS.add("年齡");
        CELL_HEADS.add("居住城市");
        CELL_HEADS.add("職業");
        CELL_HEADS.add("生日");
    }

創建一頁對象

    private static Sheet buildDataSheet(Workbook workbook) {
        //創建一頁
        Sheet sheet = workbook.createSheet("信息表");
        for (int i = 0; i < CELL_HEADS.size(); i++) {
            //設置每個格子默認寬
            sheet.setColumnWidth(i, 4000);
        }
            // 設置默認一行行高
            sheet.setDefaultRowHeight((short) 1000);
            // 構建頭單元格樣式
            CellStyle cellStyle = buildHeadCellStyle(sheet.getWorkbook());
            // 寫入第一行各列的數據
            Row head = sheet.createRow(0);
            for (int j = 0; j < CELL_HEADS.size(); j++) {
                //單個格子
                Cell cell = head.createCell(j);
                cell.setCellValue(CELL_HEADS.get(j));
                cell.setCellStyle(cellStyle);
            }
            return sheet;

    }

設置第一行列頭樣式

private static CellStyle buildHeadCellStyle(Workbook workbook) {
        //樣式
        CellStyle style = workbook.createCellStyle();
        //對齊方式設置
        style.setAlignment(HorizontalAlignment.CENTER);
        //邊框顏色和寬度設置
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex()); // 下邊框
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex()); // 左邊框
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.BLACK.getIndex()); // 右邊框
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.BLACK.getIndex()); // 上邊框
        //設置背景顏色
        style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        //粗體字設置
        Font font = workbook.createFont();
        font.setBold(true);
        style.setFont(font);
        return style;
    }