对象生成excel表格

话不多说直接上代码:

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;
}

启动类

//要写入的对象
        Workbook workbook = ExcelWriter.exportData(users);
        // 以文件的形式输出工作簿对象
        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();
            }
            //生成输出流
            fileOut = new FileOutputStream(exportFilePath);
            //写入数据
            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("关闭输出流时发生错误，错误原因：" + e.getMessage());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

创建excel对象

    /**
     * 生成Excel并写入数据信息
     * @param users 数据列表
     * @return 写入数据后的工作簿对象
     */
    public static Workbook exportData(List<User2> users) {
        // 生成xlsx的Excel
//        Workbook workbook = new SXSSFWorkbook();

        // 如需生成xls的Excel，请使用下面的工作簿对象，注意后续输出时文件后缀名也需更改为xls
        Workbook workbook = new HSSFWorkbook();

        // 生成Sheet表，写入第一行的列头
        Sheet sheet = buildDataSheet(workbook);
        //构建每行的数据内容
        int rowNum = 1;
        for (Iterator<User2> it = users.iterator(); it.hasNext(); ) {
            User2 user = it.next();
            if (user == null) {
                continue;
            }
            //输出行数据
            Row row = sheet.createRow(rowNum++);
            //姓名
            row.createCell(0).setCellValue(user.getName());
            //年龄
            row.createCell(1).setCellValue(user.getAge());
            //所在城市
            row.createCell(2).setCellValue(user.getLocation());
            //职业
            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;

    }

创建列头

private static List<String> CELL_HEADS; //列头

    static{
        // 类装载时就载入指定好的列头信息，如有需要，可以考虑做成动态生成的列头
        CELL_HEADS = new ArrayList<>();
        CELL_HEADS.add("姓名");
        CELL_HEADS.add("年龄");
        CELL_HEADS.add("居住城市");
        CELL_HEADS.add("职业");
        CELL_HEADS.add("生日");
    }

创建一页对象

    private static Sheet buildDataSheet(Workbook workbook) {
        //创建一页
        Sheet sheet = workbook.createSheet("信息表");
        for (int i = 0; i < CELL_HEADS.size(); i++) {
            //设置每个格子默认宽
            sheet.setColumnWidth(i, 4000);
        }
            // 设置默认一行行高
            sheet.setDefaultRowHeight((short) 1000);
            // 构建头单元格样式
            CellStyle cellStyle = buildHeadCellStyle(sheet.getWorkbook());
            // 写入第一行各列的数据
            Row head = sheet.createRow(0);
            for (int j = 0; j < CELL_HEADS.size(); j++) {
                //单个格子
                Cell cell = head.createCell(j);
                cell.setCellValue(CELL_HEADS.get(j));
                cell.setCellStyle(cellStyle);
            }
            return sheet;

    }

设置第一行列头样式

private static CellStyle buildHeadCellStyle(Workbook workbook) {
        //样式
        CellStyle style = workbook.createCellStyle();
        //对齐方式设置
        style.setAlignment(HorizontalAlignment.CENTER);
        //边框颜色和宽度设置
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex()); // 下边框
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex()); // 左边框
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.BLACK.getIndex()); // 右边框
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.BLACK.getIndex()); // 上边框
        //设置背景颜色
        style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        //粗体字设置
        Font font = workbook.createFont();
        font.setBold(true);
        style.setFont(font);
        return style;
    }