Ben Nadel POIを使用してExcelを読み取る

Question

私はBen NadelのExcelファイルをColdFusionで、POIコードをhttps://www.bennadel.com/blog/472-reading-excel-files-with-coldfusion-and-poi.htmにして、私のExcelファイルを読むことにしています。 私のExcelの行が統一されているとき、彼のサンプルコードでExcelファイルを読むことができます。ベンは彼のコメントでこれについて言及した。しかし、私のExcelは、常に均一な行を持っていません。いくつかは生年月日、性別を持たない人もいます。 Ben Nadelのコードは、一度空のセルに当たったらエラーになります。それは、 objCell変数が存在しないと言います。次のコードはクラッシュします：

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

誰かが例を持ち、ループ時に空のセルを読み取ることができるコードを共有しても大丈夫ですか？

私はここベンのコードを貼り付けています：

<!--- 
    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

は、ColdFusion-8にも、空のセルを読むために2つのステップの下に実行します。

1. 変数を追加します。外HSSFCellを表現するためにループします。例：
   <cfset jCell = createObject("java", "org.apache.poi.hssf.usermodel.HSSFCell")>
2. 使用関数objRow。 objRowではなくGetLastCellNum（）です。 GetPhysicalNumberOfCells（）。例：
   <cfset intCellCount = objRow.GetLastCellNum() />
3. は、変数objCellの有無に基づいて、可変objCellTypeの値を設定する<cfif>条件を追加します。例：
   <cfset objCell = objRow.GetCell(JavaCast("int", intCell)) /> <cfif structKeyExists(variables, "objCell")> <cfset objCellType = objCell.GetCellType() /> <cfelse> <cfset objCellType = jCell.CELL_TYPE_BLANK /> </cfif>
4. ステップ1の例で作成した変数名とobjCell.CELL_TYPE_ [タイプ名]へのすべての参照にobjCell変数名を置き換えます。
   <cfif (objCellType EQ jCell.CELL_TYPE_NUMERIC)>