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POI对Excel自定义日期格式的读取

2017-07-24 14:05 288 查看

用POI读取Excel数据：（版本号：POI3.7）

1、读取Excel

Java代码

private List<String[]> rosolveFile(InputStream is, String suffix,
            int startRow) throws IOException, FileNotFoundException {
        Workbook xssfWorkbook = null;
        if ("xls".equals(suffix)) {
            xssfWorkbook = new HSSFWorkbook(is);
        } else if ("xlsx".equals(suffix)) {
            xssfWorkbook = new XSSFWorkbook(is);
        }
        Sheet xssfSheet = xssfWorkbook.getSheetAt(0);
        if (xssfSheet == null) {
            return null;
        }
        ArrayList<String[]> list = new ArrayList<String[]>();
        int lastRowNum = xssfSheet.getLastRowNum();
        for (int rowNum = startRow; rowNum <= lastRowNum; rowNum++) {
            if (xssfSheet.getRow(rowNum) != null) {
                Row xssfRow = xssfSheet.getRow(rowNum);
                short firstCellNum = xssfRow.getFirstCellNum();
                short lastCellNum = xssfRow.getLastCellNum();
                if (firstCellNum != lastCellNum) {
                    String[] values = new String[lastCellNum];
                    for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
                        Cell xssfCell = xssfRow.getCell(cellNum);
                        if (xssfCell == null) {
                            values[cellNum] = "";
                        } else {
                            values[cellNum] = parseExcel(xssfCell);
                        }
                    }
                    list.add(values);
                }
            }
        }
        return list;
    }

private List<String[]> rosolveFile(InputStream is, String suffix,
int startRow) throws IOException, FileNotFoundException {
Workbook xssfWorkbook = null;
if ("xls".equals(suffix)) {
xssfWorkbook = new HSSFWorkbook(is);
} else if ("xlsx".equals(suffix)) {
xssfWorkbook = new XSSFWorkbook(is);
}
Sheet xssfSheet = xssfWorkbook.getSheetAt(0);
if (xssfSheet == null) {
return null;
}
ArrayList<String[]> list = new ArrayList<String[]>();
int lastRowNum = xssfSheet.getLastRowNum();
for (int rowNum = startRow; rowNum <= lastRowNum; rowNum++) {
if (xssfSheet.getRow(rowNum) != null) {
Row xssfRow = xssfSheet.getRow(rowNum);
short firstCellNum = xssfRow.getFirstCellNum();
short lastCellNum = xssfRow.getLastCellNum();
if (firstCellNum != lastCellNum) {
String[] values = new String[lastCellNum];
for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
Cell xssfCell = xssfRow.getCell(cellNum);
if (xssfCell == null) {
values[cellNum] = "";
} else {
values[cellNum] = parseExcel(xssfCell);
}
}
list.add(values);
}
}
}
return list;
}

2、Excel数据处理：

Excel存储日期、时间均以数值类型进行存储，读取时POI先判断是是否是数值类型，再进行判断转化

1、数值格式(CELL_TYPE_NUMERIC):

1.纯数值格式：getNumericCellValue() 直接获取数据

2.日期格式：处理yyyy-MM-dd, d/m/yyyy h:mm, HH:mm 等不含文字的日期格式

1).判断是否是日期格式：HSSFDateUtil.isCellDateFormatted(cell)

2).判断是日期或者时间

cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")

OR:
cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("yyyy-MM-dd")

3.自定义日期格式：处理yyyy年m月d日,h时mm分,yyyy年m月等含文字的日期格式

判断cell.getCellStyle().getDataFormat()值，解析数值格式

yyyy年m月d日----->31

m月d日---->58

h时mm分--->32

2、字符格式(CELL_TYPE_STRING):直接获取内容

Java代码

private String parseExcel(Cell cell) {
        String result = new String();
        switch (cell.getCellType()) {
        case HSSFCell.CELL_TYPE_NUMERIC:// 数字类型
            if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式
                SimpleDateFormat sdf = null;
                if (cell.getCellStyle().getDataFormat() == HSSFDataFormat
                        .getBuiltinFormat("h:mm")) {
                    sdf = new SimpleDateFormat("HH:mm");
                }
c2e1
else {// 日期
                    sdf = new SimpleDateFormat("yyyy-MM-dd");
                }
                Date date = cell.getDateCellValue();
                result = sdf.format(date);
            } else if (cell.getCellStyle().getDataFormat() == 58) {
                // 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58)
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                double value = cell.getNumericCellValue();
                Date date = org.apache.poi.ss.usermodel.DateUtil
                        .getJavaDate(value);
                result = sdf.format(date);
            } else {
                double value = cell.getNumericCellValue();
                CellStyle style = cell.getCellStyle();
                DecimalFormat format = new DecimalFormat();
                String temp = style.getDataFormatString();
                // 单元格设置成常规
                if (temp.equals("General")) {
                    format.applyPattern("#");
                }
                result = format.format(value);
            }
            break;
        case HSSFCell.CELL_TYPE_STRING:// String类型
            result = cell.getRichStringCellValue().toString();
            break;
        case HSSFCell.CELL_TYPE_BLANK:
            result = "";
        default:
            result = "";
            break;
        }
        return result;
    }

private String parseExcel(Cell cell) {
String result = new String();
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:// 数字类型
if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式
SimpleDateFormat sdf = null;
if (cell.getCellStyle().getDataFormat() == HSSFDataFormat
.getBuiltinFormat("h:mm")) {
sdf = new SimpleDateFormat("HH:mm");
} else {// 日期
sdf = new SimpleDateFormat("yyyy-MM-dd");
}
Date date = cell.getDateCellValue();
result = sdf.format(date);
} else if (cell.getCellStyle().getDataFormat() == 58) {
// 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58)
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
double value = cell.getNumericCellValue();
Date date = org.apache.poi.ss.usermodel.DateUtil
.getJavaDate(value);
result = sdf.format(date);
} else {
double value = cell.getNumericCellValue();
CellStyle style = cell.getCellStyle();
DecimalFormat format = new DecimalFormat();
String temp = style.getDataFormatString();
// 单元格设置成常规
if (temp.equals("General")) {
format.applyPattern("#");
}
result = format.format(value);
}
break;
case HSSFCell.CELL_TYPE_STRING:// String类型
result = cell.getRichStringCellValue().toString();
break;
case HSSFCell.CELL_TYPE_BLANK:
result = "";
default:
result = "";
break;
}
return result;
}

*万能处理方案：

所有日期格式都可以通过getDataFormat()值来判断

yyyy-MM-dd-----
14

yyyy年m月d日---
31

yyyy年m月-------
57

m月d日 ----------
58

HH:mm-----------
20

h时mm分 -------
32

Java代码

//1、判断是否是数值格式
if(cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC){
    short format = cell.getCellStyle().getDataFormat();
    SimpleDateFormat sdf = null;
    if(format == 14 || format == 31 || format == 57 || format == 58){
        //日期
        sdf = new SimpleDateFormat("yyyy-MM-dd");
    }else if (format == 20 || format == 32) {
        //时间
        sdf = new SimpleDateFormat("HH:mm");
    }
    double value = cell.getNumericCellValue();
    Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value);
    result = sdf.format(date);
}

//1、判断是否是数值格式
if(cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC){
short format = cell.getCellStyle().getDataFormat();
SimpleDateFormat sdf = null;
if(format == 14 || format == 31 || format == 57 || format == 58){
//日期
sdf = new SimpleDateFormat("yyyy-MM-dd");
}else if (format == 20 || format == 32) {
//时间
sdf = new SimpleDateFormat("HH:mm");
}
double value = cell.getNumericCellValue();
Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value);
result = sdf.format(date);
}

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标签： poi Excel

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