复杂Excel转换与导入

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需求

把不同客户提供Excel 直接导入到系统中生成对应的收货单或是出货单。后端创建收货端和出货单的接口已经有现成的webservice或是标准的xml；这类需要做的就是把客户提供不同种类的Excel mapping成标准格式。

要重点解决问题

不同格式的excel如何找到对应的数据项，比如一个Excel中需要字段分别在不同的sheet或是不同的位置上。

解决方案

第一个定位配置信息，sheet-name：数据从哪个sheet中读取，默认sheet1,start-tag:固定标识,查找Excel中一些特殊文本信息来定位具体的celladdress(行，列)，data-offset:设置一个偏移量，在找到具体内容的地址后可能真正需要数据在后面，那就需要设置一个偏移量待读取信息， end-tag:结束位置，用于循环读取的范围。

第二个映射字段明，XmlNode Name:就是目标字段明，data-field:Excel中对应的字段名称（含有表头的行）,data-type:目标字段的类型，data-formatter:格式化截取excel Cell中的内容比如：需要通过substring,或splitl来取其中的内容。

第三个表示单个表头，还是循环的表体 replicate="true" 表示需要循环读取。

大致的处理过程

先根据配置规则把Excel中需要的信息提取出来并生成一个XML文档，如果标准的接口XML结构和数据都比较复杂，那么还需要使用XSLT语言来做更复杂的mapping，满足后端服务的要求。

实际运行的过程

原始Excel

配置规则XML

转换成初步XML

实现的代码

代码非常的简单，还是第一个版本，以后再慢慢优化和重构

class Program
{
static async Task Main(string[] args)
{
var path = @"d:\9C箱单0000880680.xlsx";
var configpath = @"d:\XslImportRule1.xml";
var xdoc = XDocument.Load(configpath);
var root = xdoc.Root.Name;
var descxml = new XDocument();
descxml.Add(new XElement(xdoc.Root.Name));
var workbook = new XSSFWorkbook(path);
Process(workbook,null, xdoc.Root, , descxml.Root,null);
descxml.Save("d:\\output.xml");
return;
}
static void Process(IWorkbook book, ISheet sheet, XElement element, int depth, XElement root,DataRow dr)
{
var pelment = element.Parent;
var name = element.Name;
var atts = element.Attributes();
var replicate = atts.Where(x => x.Name == "replicate").FirstOrDefault()?.Value;
var sheetname = atts.Where(x => x.Name == "sheet-name").FirstOrDefault()?.Value;
var starttag = atts.Where(x => x.Name == "start-tag").FirstOrDefault()?.Value;
var start = atts.Where(x => x.Name == "start").FirstOrDefault()?.Value;
var endtag = atts.Where(x => x.Name == "end-tag").FirstOrDefault()?.Value;
var end = atts.Where(x => x.Name == "end").FirstOrDefault()?.Value;
var fieldname = atts.Where(x => x.Name == "data-field").Select(x => x.Value).FirstOrDefault();
var datatype = atts.Where(x => x.Name == "data-type").Select(x => x.Value);
var defaultvalue = atts.Where(x => x.Name == "data-default").FirstOrDefault()?.Value;
var formatter = atts.Where(x => x.Name == "data-formatter").FirstOrDefault()?.Value;
var offset = atts.Where(x => x.Name == "data-offset").FirstOrDefault()?.Value;
XElement copyelement = null; //if (element.Parent != null )
//{
// copyelement = new XElement(name);
// root.Add(copyelement);
//}
if (!string.IsNullOrEmpty(replicate) && !string.IsNullOrEmpty(sheetname)) {
sheet = book.GetSheet(sheetname);
} if (!element.HasElements)
{
copyelement = new XElement(name);
root.Add(copyelement);
// element is child with no descendants
if (dr == null)
{
CellAddress celladdress = null;
if (!string.IsNullOrEmpty(starttag))
{
celladdress = findXslx(sheet, starttag);
}
else if (!string.IsNullOrEmpty(start))
{
celladdress = new CellAddress(new CellReference(start));
}
if (celladdress != null)
{
var r = ;
var c = ;
if (!string.IsNullOrEmpty(offset))
{
var sp = offset.Split(';');
foreach (var ts in sp)
{
var sparray = ts.Split(':');
if (sparray[].Equals("c", StringComparison.OrdinalIgnoreCase))
{
c = Convert.ToInt32(sparray[]);
}
else
{
r = Convert.ToInt32(sparray[]);
}
}
}
var cell = sheet.GetRow(celladdress.Row + r).GetCell(celladdress.Column + c);
var val = getCellValue(cell);
if (string.IsNullOrEmpty(val) && !string.IsNullOrEmpty(defaultvalue))
{
val = defaultvalue;
}
if (!string.IsNullOrEmpty(val) && !string.IsNullOrEmpty(formatter))
{
var codescript = formatter.Replace("$", "\"" + val + "\"");
var fval = CSharpScript.EvaluateAsync<string>(codescript).Result;
val = fval;
}
copyelement.SetValue(val);
}
else if (!string.IsNullOrEmpty(defaultvalue))
{
copyelement.SetValue(defaultvalue);
}
}
else
{
if(dr.Table.Columns.Contains(fieldname))
{
var val = dr[fieldname].ToString();
if (string.IsNullOrEmpty(val) && !string.IsNullOrEmpty(defaultvalue))
{
val = defaultvalue; }
copyelement.SetValue(val);
}
else if(!string.IsNullOrEmpty(defaultvalue))
{
copyelement.SetValue(defaultvalue);
}
} }
else
{
depth++;
if (replicate == "true")
{
var datatable= filldatatable(sheet, starttag, start, endtag, end, offset);
if (datatable.Rows.Count > )
{
foreach (DataRow datarow in datatable.Rows)
{
copyelement = new XElement(name);
foreach (var child in element.Elements())
{
if (copyelement != null)
{
Process(book, sheet, child, depth, copyelement, datarow);
}
else
{
Process(book, sheet, child, depth, root, datarow);
} }
root.Add(copyelement);
}
}
}
else
{
if (element.Parent != null)
{
copyelement = new XElement(name);
root.Add(copyelement);
}
foreach (var child in element.Elements())
{
if (copyelement != null)
{
Process(book,sheet, child, depth, copyelement,null);
}
else
{
Process(book,sheet, child, depth, root,null);
} }
} depth--;
}
} private static DataTable filldatatable(ISheet sheet, string starttag, string start, string endtag, string end, string offset)
{
CellAddress startaddress = null;
CellAddress endaddress = null;
if (!string.IsNullOrEmpty(starttag))
{
startaddress = findXslx(sheet, starttag);
}
else if (!string.IsNullOrEmpty(start))
{
startaddress = new CellAddress(new CellReference(start));
}
else
{
startaddress = new CellAddress(new CellReference("A0"));
}
if (!string.IsNullOrEmpty(endtag))
{
endaddress = findXslx(sheet, endtag);
}
else if (!string.IsNullOrEmpty(end))
{
endaddress = new CellAddress(new CellReference(end));
}
else
{
endaddress = null;
}
var offsetr = ;
var offsetc = ;
if (!string.IsNullOrEmpty(offset))
{
var sp = offset.Split(';');
foreach (var ts in sp)
{
var sparray = ts.Split(':');
if (sparray[].Equals("c", StringComparison.OrdinalIgnoreCase))
{
offsetc = Convert.ToInt32(sparray[]);
}
else
{
offsetr = Convert.ToInt32(sparray[]);
}
}
}
var firstrow = startaddress == null ? sheet.FirstRowNum : startaddress.Row + offsetr;
var lastrow = (endaddress == null) ? sheet.LastRowNum : endaddress.Row;
var table = new DataTable();
var lastcell = ; //row.LastCellNum;
var firstcell = ; //row.FirstCellNum + offsetc;
for (int r = firstrow; r < lastrow; r++)
{
var row = sheet.GetRow(r);
if (row == null) continue; if (r == firstrow)
{
lastcell = row.LastCellNum;
firstcell = row.FirstCellNum + offsetc;
for (int c = firstcell; c < lastcell; c++)
{
var cell = row.GetCell(c);
if (cell == null) continue;
var strval = getCellValue(cell).Trim();
if (!string.IsNullOrEmpty(strval))
{
table.Columns.Add(new DataColumn(strval));
}
}
}
else
{
var dataRow = table.NewRow();
var array = new string[table.Columns.Count];
//for (var c = 0; c < table.Columns.Count; c++)
//{
// var cell = row.GetCell(firstcell+c);
// var val = getCellValue(cell).Trim();
// array[c] = val;
//}
for (int c = firstcell; c < lastcell; c++)
{
var cell = row.GetCell(c);
var val = getCellValue(cell).Trim();
array[c- firstcell] = val;
}
dataRow.ItemArray = array;
table.Rows.Add(dataRow);
}
}
return table;
} private static CellAddress findXslx(ISheet sheet, string key)
{
var lastrow = sheet.LastRowNum;
var firstrow = sheet.FirstRowNum;
for (int r = firstrow; r < lastrow; r++)
{
var row = sheet.GetRow(r);
if (row == null) continue;
var lastcell = row.LastCellNum;
var firstcell = row.FirstCellNum;
for (int c = firstcell; c < lastcell; c++)
{
var cell = row.GetCell(c);
if (cell == null) continue;
var strval = getCellValue(cell).Trim();
//if (strval.Trim().Equals(key, StringComparison.OrdinalIgnoreCase))
//{
// return cell.Address;
//}
if (match(key, strval))
{
return cell.Address;
}
}
}
return null;
}
private static string getCellValue(ICell cell)
{
if (cell == null)
{
return string.Empty;
}
var dataFormatter = new DataFormatter(CultureInfo.CurrentCulture); // If this is not part of a merge cell,
// just get this cell's value like normal.
if (!cell.IsMergedCell)
{
return dataFormatter.FormatCellValue(cell);
} // Otherwise, we need to find the value of this merged cell.
else
{
// Get current sheet.
var currentSheet = cell.Sheet; // Loop through all merge regions in this sheet.
for (int i = ; i < currentSheet.NumMergedRegions; i++)
{
var mergeRegion = currentSheet.GetMergedRegion(i); // If this merged region contains this cell.
if (mergeRegion.FirstRow <= cell.RowIndex && cell.RowIndex <= mergeRegion.LastRow &&
mergeRegion.FirstColumn <= cell.ColumnIndex && cell.ColumnIndex <= mergeRegion.LastColumn)
{
// Find the top-most and left-most cell in this region.
var firstRegionCell = currentSheet.GetRow(mergeRegion.FirstRow)
.GetCell(mergeRegion.FirstColumn); // And return its value.
return dataFormatter.FormatCellValue(firstRegionCell);
}
}
// This should never happen.
throw new Exception("Cannot find this cell in any merged region");
}
} static bool match(string pattern, string input)
{
if (String.Compare(pattern, input) == )
{
return true;
}
else if (String.IsNullOrEmpty(input))
{
if (String.IsNullOrEmpty(pattern.Trim(new Char[] { '*' })))
{
return true;
}
else
{
return false;
}
}
else if (pattern.Length == )
{
return false;
}
else if (pattern[] == '?')
{
return match(pattern.Substring(), input.Substring());
}
else if (pattern[pattern.Length - ] == '?')
{
return match(pattern.Substring(, pattern.Length - ),
input.Substring(, input.Length - ));
}
else if (pattern[] == '*')
{
if (match(pattern.Substring(), input))
{
return true;
}
else
{
return match(pattern, input.Substring());
}
}
else if (pattern[pattern.Length - ] == '*')
{
if (match(pattern.Substring(, pattern.Length - ), input))
{
return true;
}
else
{
return match(pattern, input.Substring(, input.Length - ));
}
}
else if (pattern[] == input[])
{
return match(pattern.Substring(), input.Substring());
}
return false;
}
}
}