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  • POI基本操作

    POI基本操作

    导入依赖

    <!--xls(03)-->
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>
        <version>3.9</version>
    </dependency>
    <!--xlsx(07)-->
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
        <version>3.9</version>
    </dependency>
    

    POI 写入操作

    //03版本Excel  最多支持65535行
    Workbook workbook = new HSSFWorkbook();
    Sheet sheet = workbook.createSheet("hah");
    Row row = sheet.createRow(0);
    Cell cell = row.createCell(0);
    cell.setCellValue("今日新增");
    Cell cell1 = row.createCell(1);
    cell1.setCellValue(new Date());
    
    Row row1 = sheet.createRow(1);
    Cell cell_1 = row1.createCell(0);
    cell_1.setCellValue("每日新闻");
    Cell cell1_2 = row1.createCell(1);
    cell1_2.setCellValue("666");
    FileOutputStream out = new FileOutputStream(new File(PATH,"11.xls"));
    workbook.write(out);
    out.close();
    
    
    
      //07版本Excel
      Workbook workbook = new XSSFWorkbook();
      Sheet sheet = workbook.createSheet("hah");
      Row row = sheet.createRow(0);
      Cell cell = row.createCell(0);
      cell.setCellValue("今日新增");
      Cell cell1 = row.createCell(1);
      cell1.setCellValue(new Date());
    
      Row row1 = sheet.createRow(1);
      Cell cell_1 = row1.createCell(0);
      cell_1.setCellValue("每日新闻");
      Cell cell1_2 = row1.createCell(1);
      cell1_2.setCellValue("666");
      FileOutputStream out = new FileOutputStream(new File(PATH,"22.xlsx"));
      workbook.write(out);
      out.close();
    
    
    
    Workbook workbook = new SXSSFWorkbook();
     Sheet sheet = workbook.createSheet("hah");
     Row row = sheet.createRow(0);
     Cell cell = row.createCell(0);
     cell.setCellValue("今日新增");
     Cell cell1 = row.createCell(1);
     cell1.setCellValue(new Date());
    
     Row row1 = sheet.createRow(1);
     Cell cell_1 = row1.createCell(0);
     cell_1.setCellValue("每日新闻");
     Cell cell1_2 = row1.createCell(1);
     cell1_2.setCellValue("666");
     FileOutputStream out = new FileOutputStream(new File(PATH,"33.xlsx"));
     workbook.write(out);
     //清理临时文件
     ((SXSSFWorkbook)workbook).dispose();
     out.close();
    

    POI读取操作

    //获取一个文件流
            InputStream inputStream = new FileInputStream(new File(PATH,"会员消费商品明细表.xls"));
            //创建一个工作表,读取文件
            Workbook workbook=new HSSFWorkbook(inputStream);
            //获取工作簿名称
    
            Sheet sheet = workbook.getSheetAt(0);
            //获取第一行标题
            Row row_title = sheet.getRow(0);
            if (row_title!=null){
                //获取一行有多少列
                int cell_counts = row_title.getPhysicalNumberOfCells();
                for (int cellNum=0;cellNum<cell_counts;cellNum++){
                    //遍历获取每一个单元格
                    Cell cell = row_title.getCell(cellNum);
                    if (cell !=null){
                        //获取单元格内元素类型
                        int cellType = cell.getCellType();
                        //获取单元格内元素内容
                        String cell_value = cell.getStringCellValue();
                        System.out.print(cellType+cell_value+" | ");
                    }
    
                }
    
    
                //获取除标题行外的所有行
                int rows = sheet.getPhysicalNumberOfRows();
                for(int row_num=1;row_num< rows;row_num++){
                    //遍历获取所有行
                    Row row_data = sheet.getRow(row_num);
                    if(row_data!=null){
                        //获取行有多少列
                        int cell_count = row_data.getPhysicalNumberOfCells();
    
                        for(int cell_num=0;cell_num<cell_count;cell_num++){
                            //遍历得到每一个单元格
                            Cell cell = row_data.getCell(cell_num);
                            if(cell!=null){
                                int cellType = cell.getCellType();
                                String cellValue = " ";
                                switch (cellType){
                                    case HSSFCell.CELL_TYPE_STRING:
                                        System.out.print("[String]");
                                        cellValue = cell.getStringCellValue();
                                        break;
                                    case HSSFCell.CELL_TYPE_BOOLEAN:
                                        System.out.print("[Boolean]");
                                    cellValue = String.valueOf(cell.getBooleanCellValue());
                                        break;
    
                                    case HSSFCell.CELL_TYPE_BLANK:
                                        System.out.print("[Blank]");
    
                                        break;
                                    case HSSFCell.CELL_TYPE_NUMERIC:
                                        System.out.print("[numergic]");
                                        if(HSSFDateUtil.isCellDateFormatted(cell)){
                                            Date date = cell.getDateCellValue();
                                      cellValue = new DateTime(date).toString("yyyy-MM-dd");
                                        }else {
                                            //不是日期格式,防止数字过长
                                            System.out.print("[转换为字符串]");
                                            cell.setCellType(HSSFCell.CELL_TYPE_STRING);
                                            cellValue=cell.toString();
                                        }
                                        break;
                                    case HSSFCell.CELL_TYPE_ERROR:
                                        System.out.println("[数据类型错误]");
                                        break;
                                }
                                System.out.println(cellValue);
                            }
                        }
    
                    }
    

    操作公式

    FileInputStream inputStream = new FileInputStream(new File(PATH,"计算公式.xls"));
    Workbook workbook = new HSSFWorkbook(inputStream);
    Sheet sheet = workbook.getSheetAt(0);
    
    Row row = sheet.getRow(4);
    Cell cell = row.getCell(0);
    HSSFFormulaEvaluator formulaEvaluator = new HSSFFormulaEvaluator((HSSFWorkbook) workbook);
    int cellType = cell.getCellType();
    switch (cellType){
        case Cell.CELL_TYPE_FORMULA:
            String formula = cell.getCellFormula();
            System.out.println(formula);
    
            //计算
            CellValue evaluate = formulaEvaluator.evaluate(cell);
            String cellValue = evaluate.formatAsString();
            System.out.println(cellValue);
            break;
    }
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  • 原文地址:https://www.cnblogs.com/liangyongwang/p/14235730.html
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