Excelpoi导入导出--上完整代码！

 //1.写入excel
    Workbook();

结果如下图： 详见代码文章末尾代码内方法： Workbook();

 //2.读取excel
        Readbook();

结果如下图： 详见代码文章末尾代码内方法： Readbook();

   //3.写入车辆excel---------------该方法为实战用例
        Ceatbook();

结果如下图： 详见代码文章末尾代码内方法：  Ceatbook();

 

    //4.list循环写入车辆excel---------------该方法为实战用例

ForCeatbook();

结果如下图： 详见代码文章末尾代码内方法：  ForCeatbook();

 

public class Excelpoi {
 
    public static void main(String[] args) throws IOException {
        //1.写入excel
        Workbook();
        //2.读取excel
        Readbook();
        //3.写入车辆excel
        Ceatbook();
        //4.循环写入车辆excel
        ForCeatbook();
    }
 
    /**
     * 写入excel
     *
     * @param
     * @throws IOException
     */
    public static void Workbook() throws IOException {
        //1.打开excel
        XSSFWorkbook workbook = new XSSFWorkbook();
        //2.创建sheet页
        XSSFSheet sheet1 = workbook.createSheet("sheet1");//sheet:工作表
        //3.创建行,索引从0开始
        XSSFRow row = sheet1.createRow(0);//row 行
        //4.创建单元格,索引从0开始
        XSSFCell cell = row.createCell(0);//cell:单元格
        //5.向单元格中插入数据
        cell.setCellValue("你好");
        //6.将数据写入文件,相当于另存为
        workbook.write(new FileOutputStream("F:\\ExcelPoi\\excelpoi写入.xlsx"));
        System.out.println("生成excel成功");
 
    }
 
    /**
     * 读取excel
     *
     * @param
     * @throws IOException
     */
    public static void Readbook() throws IOException {
        //1.使用excel打开指定的xlsx文件
        XSSFWorkbook fw = new XSSFWorkbook("F:\\ExcelPoi\\excelpoi写入.xlsx");
        //2.获取第一个sheet页
        XSSFSheet sheet1 = fw.getSheetAt(0);
        //3.获取第0行
        XSSFRow row = sheet1.getRow(0);
        //4.获取第0个单元格
        XSSFCell cell = row.getCell(0);
        //5.获取单元格中的数据
        System.out.println(cell.getStringCellValue());
        System.out.println("读取成功");
 
 
    }
 
    /**
     * 创建一个车辆excel
     *
     * @throws IOException
     */
    public static void Ceatbook() throws IOException {
        /*1.创建EXCEL文件*/
        XSSFWorkbook workbook = new XSSFWorkbook();
 
        /*2.创建sheet页面*/
        XSSFSheet sheet1 = workbook.createSheet("sheet1");
        sheet1.addMergedRegion(new CellRangeAddress(0, 0, 0, 2));
 
        /*3.创建车辆信息头*/
        XSSFRow row = sheet1.createRow(0);
        XSSFCell cell = row.createCell(0);
        XSSFCellStyle textAlignCenter = workbook.createCellStyle();
        textAlignCenter.setAlignment(HorizontalAlignment.CENTER);//横着对其
        textAlignCenter.setVerticalAlignment(VerticalAlignment.CENTER);//上下对齐
        cell.setCellStyle(textAlignCenter);
        cell.setCellValue("车辆信息");
 
        /*4.创建表头*/
        XSSFRow titleRow = sheet1.createRow(1);
        XSSFCell idCell = titleRow.createCell(0);
        idCell.setCellValue("编号");
        XSSFCell nameCell = titleRow.createCell(1);
        nameCell.setCellValue("车牌");
        XSSFCell ageCell = titleRow.createCell(2);
        ageCell.setCellValue("颜色");
 
 
        /*5.创建数据*/
        XSSFRow dataRow1 = sheet1.createRow(2);
        XSSFCell idCell1 = dataRow1.createCell(0);
        idCell1.setCellValue("1");
        XSSFCell nameCell1 = dataRow1.createCell(1);
        nameCell1.setCellValue("京A11111");
        XSSFCell ageCell1 = dataRow1.createCell(2);
        ageCell1.setCellValue("black");
 
        XSSFRow dataRow2 = sheet1.createRow(3);
        XSSFCell idCell2 = dataRow2.createCell(0);
        idCell2.setCellValue("2");
        XSSFCell nameCell2 = dataRow2.createCell(1);
        nameCell2.setCellValue("京A22222");
        XSSFCell ageCell2 = dataRow2.createCell(2);
        ageCell2.setCellValue("red");
 
 
        workbook.write(new FileOutputStream("F:\\ExcelPoi\\车辆信息.xlsx"));
 
        System.out.println("车辆写入成功");
 
 
    }
 
    /**
     * 循环创建一个车辆excel
     *
     * @throws IOException
     */
    public static void ForCeatbook() throws IOException {
        /*1.创建EXCEL文件*/
        XSSFWorkbook workbook = new XSSFWorkbook();
 
        /*2.创建sheet页面*/
        XSSFSheet sheet1 = workbook.createSheet("sheet1");
        sheet1.addMergedRegion(new CellRangeAddress(0, 0, 0, 2));
 
        /*3.创建车辆信息头*/
        XSSFRow row = sheet1.createRow(0);
        XSSFCell cell = row.createCell(0);
        XSSFCellStyle textAlignCenter = workbook.createCellStyle();
        textAlignCenter.setAlignment(HorizontalAlignment.CENTER);
        textAlignCenter.setVerticalAlignment(VerticalAlignment.CENTER);
        cell.setCellStyle(textAlignCenter);
        cell.setCellValue("车辆信息");
 
        /*4.创建表头*/
        XSSFRow titleRow = sheet1.createRow(1);
        XSSFCell idCell = titleRow.createCell(0);
        idCell.setCellValue("编号");
        XSSFCell nameCell = titleRow.createCell(1);
        nameCell.setCellValue("车牌");
        XSSFCell ageCell = titleRow.createCell(2);
        ageCell.setCellValue("颜色");
 
 
 
 
        /*5.创建数据*/
        ArrayList vehicle = new ArrayList<>();
        vehicle.add(new Vehicle(1, "京A11111", "black"));
        vehicle.add(new Vehicle(2, "京A22222", "white"));
        vehicle.add(new Vehicle(3, "京A33333", "red"));
        vehicle.add(new Vehicle(4, "京A44444", "yellow"));
 
 
        for (int i = 0; i < vehicle.size(); i++) {
            XSSFRow dataRow1 = sheet1.createRow(2 + i);
            XSSFCell idCell1 = dataRow1.createCell(0);
            idCell1.setCellValue(vehicle.get(i).getId());
            XSSFCell nameCell1 = dataRow1.createCell(1);
            nameCell1.setCellValue(vehicle.get(i).getPlateNo());
            XSSFCell ageCell1 = dataRow1.createCell(2);
            ageCell1.setCellValue(vehicle.get(i).getColor());
        }
 
        workbook.write(new FileOutputStream("F:\\ExcelPoi\\循环车辆信息.xlsx"));
 
        System.out.println("循环车辆写入成功");
 
 
    }
}