Использование Ben Nadel POI для чтения Excel

Question

Я использую чтение файлов Excel Бена Наделя с кодами ColdFusion и POI по адресу https://www.bennadel.com/blog/472-reading-excel-files-with-coldfusion-and-poi.htm чтобы прочитать мой файл Excel. С его примерами кодов я могу прочитать файл Excel, когда строки в моем Excel сделаны одинаковыми. Бен упомянул об этом в своем комментарии. Но мой Excel, однако, не всегда имеет одинаковые строки. У некоторых есть дата рождения, у некоторых нет пола и т. Д. Коды Бена Наделя выдают ошибку, как только они попадают в пустую ячейку. Он говорит, что переменная objCell не существует. Сбой следующего кода:

<cfset objCell = objRow.GetCell(JavaCast( "int", intCell )) />

У кого-нибудь есть пример и не против поделиться кодами, которые также могут читать пустые ячейки при цикле?

Я вставляю коды Бена здесь:

  <!---
  Create the Excel file system object. This object is
  responsible for reading in the given Excel file.
  --->
<cfset objExcelFileSystem = CreateObject(
"java",
"org.apache.poi.poifs.filesystem.POIFSFileSystem"
).Init(

    CreateObject(
        "java",
        "java.io.FileInputStream"
        ).Init(

            ExpandPath( "./jenna_jameson.xls" )

            )
    ) />


 <!---
 Get the workbook from the Excel file system object that
 we just created. Remember, the workbook contains the
 Excel sheets that have our data.
 --->
 <cfset objWorkBook = CreateObject(
 "java",
 "org.apache.poi.hssf.usermodel.HSSFWorkbook"
  ).Init(
    objExcelFileSystem
    ) />

 <!---
 For this demo, we are only interested in reading in the
 data from the first sheet. Remember, since Java is zero-
 based, not one-based like ColdFusion, the first Excel
 sheet is at index ZERO (not ONE).
 --->
 <cfset objSheet = objWorkBook.GetSheetAt(
  JavaCast( "int", 0 )
  ) />
 <!---
 We are going to build a ColdFusion query that houses the
 Excel data, but we don't know anything about the data
 just yet. So, just create the place holder for the query
 and then we will add to it when we have more information.
 --->
 <cfset qCell = "" />
 <!---
 Get the Excel sheet's row iterator. This appears to be some
 sort of implementation of the Java class java.util.TreeMap,
 but I don't know much about that. What I do know, is that
 this will allow us to loop over the rows in the Excel file
 until there are no more to loop over. The interface for it
 looks like the standard iterator interface.
 --->
 <cfset objRowIterator = objSheet.rowIterator() />
 <!---
 User the row iterator to loop over all the physical rows in
 the Excel sheet. This condition checks to see if we have a
 row to read in. At this point, the iterator is NOT pointing
 at a valid Excel data row.
 --->
 <cfloop condition="objRowIterator.HasNext()">
 <!---
    We have determined that we have a valid row to read.
    Now, move the iterator to point to this valid row.
 --->
 <cfset objRow = objRowIterator.Next() />
  <!---
    Get the number of physical cells in this row. While I
    think that this can possibly change from row to row,
    for the purposes of this demo, I am going to assume
    that all rows are uniform and that this row is a model
    of how the rest of the data will be displayed.
    --->
    <cfset intCellCount = objRow.GetPhysicalNumberOfCells() />
    <!---
    Check to see if the query variable we have it actually
    a query. If we have not done anything to it yet, then
    it should still just be a string value (Yahoo for
    dynamic typing!!!). If that is the case, then let's use
    this first data row to set up the query object.
     --->
    <cfif NOT IsQuery( qCell )>
    <!---
        Create an empty query. Doing it this way creates a
        query with neither column nor row values.
    --->
    <cfset qCell = QueryNew( "" ) />
    <!---
        Now that we have an empty query, we are going to
        loop over the cells COUNT for this data row and for
        each cell, we are going to create a query column
        of type VARCHAR. I understand that cells are going
        to have different data types, but I am chosing to
        store everything as a string to make it easier.
    --->
    <cfloop index="intCell" from="0" to="#(intCellCount - 1)#"
    step="1">
        <!---
            Add the column. Notice that the name of the
            column is the text "column" plus the column
            index. I am starting my column indexes at ONE
            rather than ZERO to get it back into a more
            ColdFusion standard notation.
        --->
        <cfset QueryAddColumn(qCell,"column#(intCell + 1)#",
            "CF_SQL_VARCHAR",ArrayNew( 1 )) />
      </cfloop>
    </cfif>
    <!---
    ASSERT: Whether we are on our first Excel data row or
    our Nth data row, at this point, we have a ColdFusion
    query object that has the proper columns defined.
    --->
    <!---
    Add a row to the query so that we can store this row's
    data values.
    --->
    <cfset QueryAddRow( qCell ) />
    <!--- Loop over the cells in this row to find values. --->
   <cfloop index="intCell" from="0" to="#(intCellCount - 1)#"
    step="1">
    <!---
        When getting the value of a cell, it is important
        to know what type of cell value we are dealing
        with. If you try to grab the wrong value type,
        an error might be thrown. For that reason, we must
        check to see what type of cell we are working with.
        These are the cell types and they are constants
        of the cell object itself:

        0 - CELL_TYPE_NUMERIC
        1 - CELL_TYPE_STRING
        2 - CELL_TYPE_FORMULA
        3 - CELL_TYPE_BLANK
        4 - CELL_TYPE_BOOLEAN
        5 - CELL_TYPE_ERROR
      --->
     <!--- Get the cell from the row object. --->

     ----- **When it hit an empty cell CF throws error** ---
     <cfset objCell = objRow.GetCell(JavaCast( "int", intCell)) />


     <!--- Get the type of data in this cell. --->
     <cfset objCellType = objCell.GetCellType() />
     <!---
        Get teh value of the cell based on the data type.
        The thing to worry about here is cell forumlas and
        cell dates. Formulas can be strange and dates are
        stored as numeric types. For this demo, I am not
        going to worry about that at all. I will just grab
        dates as floats and formulas I will try to grab as
        numeric values.
        --->
       <cfif (objCellType EQ objCell.CELL_TYPE_NUMERIC)>
        <!---
            Get numeric cell data. This could be a
            standard number, could also be a date value.
            I am going to leave it up to the calling
            program to decide.
        --->
        <cfset objCellValue = objCell.GetNumericCellValue() />
      <cfelseif (objCellType EQ objCell.CELL_TYPE_STRING)>
        <cfset objCellValue = objCell.GetStringCellValue() />
      <cfelseif (objCellType EQ objCell.CELL_TYPE_FORMULA)>
        <!---
            Since most forumlas deal with numbers, I am
            going to try to grab the value as a number. If
            that throws an error, I will just grab it as a
            string value.
        --->
        <cftry>
            <cfset objCellValue = objCell.GetNumericCellValue() />
            <cfcatch>
                <!---
                    The numeric grab failed. Try to get the
                    value as a string. If this fails, just
                    force the empty string.
                --->
                <cftry>
                    <cfset objCellValue = objCell.GetStringCellValue() />
                    <cfcatch>
                        <!--- Force empty string. --->
                        <cfset objCellValue = "" />
                    </cfcatch>
                </cftry>
            </cfcatch>
        </cftry>
      <cfelseif (objCellType EQ objCell.CELL_TYPE_BLANK)>
        <cfset objCellValue = "" />
      <cfelseif (objCellType EQ objCell.CELL_TYPE_BOOLEAN)>
        <cfset objCellValue = objCell.GetBooleanCellValue() />
      <cfelse>
        <!--- If all else fails, get empty string. --->
        <cfset objCellValue = "" />
    </cfif>
    <!---
        ASSERT: At this point, we either got the cell value
        out of the Excel data cell or we have thrown an
        error or didn't get a matching type and just
        have the empty string by default. No matter what,
        the object objCellValue is defined and has some
        sort of SIMPLE ColdFusion value in it.
      --->
      <!---
        Now that we have a value, store it as a string in
        the ColdFusion query object. Remember again that my
        query names are ONE based for ColdFusion standards.
        That is why I am adding 1 to the cell index.
    --->
    <cfset qCell[ "column#(intCell + 1)#" ][ qCell.RecordCount ] = 
    JavaCast( "string", objCellValue ) />
   </cfloop>
  </cfloop>
<!---
At this point, the excel data should be in a ColdFusion
query object. However, if the query did not contain any
record, then the row iterator was never launched which
mean we never actually defined a query. As one final check
just make sure we are dealing with a query.
--->
<cfif NOT IsQuery( qCell )>
  <!--- Just define an empty query. --->
  <cfset qCell = QueryNew( "" ) />
</cfif>

Answer 1

Выполните следующие два шага, чтобы прочитать пустые ячейки также в ColdFusion-8:

1. Добавьте переменную вне цикла для представления HSSFCell. Пример:
   <cfset jCell = createObject("java", "org.apache.poi.hssf.usermodel.HSSFCell")>
2. Используйте функцию objRow. GetLastCellNum () вместо objRow. GetPhysicalNumberOfCells (). Пример:
   <cfset intCellCount = objRow.GetLastCellNum() />
3. Добавить <cfif> условие для установки значения переменной objCellType на основе существования переменной objCell. Пример:
   <cfset objCell = objRow.GetCell(JavaCast( "int", intCell)) /> <cfif structKeyExists(variables, "objCell")> <cfset objCellType = objCell.GetCellType() /> <cfelse> <cfset objCellType = jCell.CELL_TYPE_BLANK /> </cfif>
4. Замените имя переменной objCell во всех ссылках на objCell.CELL_TYPE_[type_name] именем переменной, созданным на шаге 1. Пример:
   <cfif (objCellType EQ jCell.CELL_TYPE_NUMERIC)>