基于NOPI的Execl模板转换类,直接将Execl模板转换对应的Entity
1、创建实体属性标记
1 public class CellAttribute : Attribute 2 { 3 /// <summary> 4 /// 5 /// </summary> 6 /// <param name="displayName">显示名称</param> 7 /// <param name="hander"></param> 8 public CellAttribute(string displayName, Type hander = null) 9 { 10 DisplayName = displayName; 11 12 Hander = hander; 13 } 14 15 /// <summary> 16 /// 显示名称 17 /// </summary> 18 public string DisplayName { get; set; } 19 20 /// <summary> 21 /// 类型 22 /// </summary> 23 public Type Hander { get; set; } 24 }
2、创建通用处理方法
1 public class XlsFileHandler<T> where T : new() 2 { 3 private readonly string _path; 4 private readonly Dictionary<string, CellAttribute> _cellAttributes; 5 readonly Dictionary<string, string> _propDictionary; 6 7 public XlsFileHandler(string path) 8 { 9 _path = path; 10 _cellAttributes = new Dictionary<string, CellAttribute>(); 11 _propDictionary = new Dictionary<string, string>(); 12 CreateMappers(); 13 } 14 15 /// <summary> 16 /// 创建映射 17 /// </summary> 18 private void CreateMappers() 19 { 20 foreach (var prop in typeof(T).GetProperties()) 21 { 22 foreach (CellAttribute cellMapper in prop.GetCustomAttributes(false).OfType<CellAttribute>()) 23 { 24 _propDictionary.Add(cellMapper.DisplayName, prop.Name); 25 _cellAttributes.Add(cellMapper.DisplayName, cellMapper); 26 } 27 } 28 } 29 30 /// <summary> 31 /// 获取整个xls文件对应行的T对象 32 /// </summary> 33 /// <returns></returns> 34 public List<T> ToData() 35 { 36 List<T> dataList = new List<T>(); 37 using (FileStream stream = GetStream()) 38 { 39 IWorkbook workbook = new HSSFWorkbook(stream); 40 ISheet sheet = workbook.GetSheetAt(0); 41 var rows = sheet.GetRowEnumerator(); 42 int lastCell = 0; 43 int i = 0; 44 IRow headRow = null; 45 while (rows.MoveNext()) 46 { 47 var row = sheet.GetRow(i); 48 if (i == 0) 49 { 50 headRow = sheet.GetRow(0); 51 lastCell = row.LastCellNum; 52 } 53 else 54 { 55 T t = GetData(workbook, headRow, row, lastCell); 56 dataList.Add(t); 57 } 58 i++; 59 } 60 stream.Close(); 61 } 62 return dataList; 63 } 64 65 /// <summary> 66 /// 获取T对象 67 /// </summary> 68 /// <param name="workbook"></param> 69 /// <param name="headRow"></param> 70 /// <param name="currentRow"></param> 71 /// <param name="lastCell"></param> 72 /// <returns></returns> 73 private T GetData(IWorkbook workbook, IRow headRow, IRow currentRow, int lastCell) 74 { 75 T t = new T(); 76 for (int j = 0; j < lastCell; j++) 77 { 78 var displayName = headRow.Cells[j].StringCellValue; 79 if (!_cellAttributes.ContainsKey(displayName) || !_propDictionary.ContainsKey(displayName)) 80 { 81 continue; 82 } 83 var currentAttr = _cellAttributes[displayName]; 84 var propName = _propDictionary[displayName]; 85 86 ICell currentCell = currentRow.GetCell(j); 87 string value = currentCell != null ? GetCellValue(workbook, currentCell) : ""; 88 if (currentAttr.Hander != null) 89 { 90 SetValue(ref t, propName, InvokeHandler(currentAttr.Hander, value)); 91 } 92 else 93 { 94 SetValue(ref t, propName, value); 95 } 96 } 97 return t; 98 } 99 100 /// <summary> 101 /// 动态执行处理方法 102 /// </summary> 103 /// <param name="type"></param> 104 /// <param name="value"></param> 105 /// <returns></returns> 106 private static object InvokeHandler(Type type, object value) 107 { 108 System.Reflection.ConstructorInfo constructor = type.GetConstructor(Type.EmptyTypes); 109 if (constructor == null) throw new ArgumentNullException("type"); 110 object mgConstructor = constructor.Invoke(null); 111 System.Reflection.MethodInfo method = type.GetMethod("GetResults"); 112 return method.Invoke(mgConstructor, new[] { value }); 113 } 114 115 /// <summary> 116 /// 获取文件流 117 /// </summary> 118 /// <returns></returns> 119 private FileStream GetStream() 120 { 121 if (!File.Exists(_path)) throw new FileNotFoundException("path"); 122 return new FileStream(_path, FileMode.Open, FileAccess.Read, FileShare.Read); 123 } 124 125 /// <summary> 126 /// 获取xls文件单元格的值 127 /// </summary> 128 /// <param name="workbook"></param> 129 /// <param name="cell"></param> 130 /// <returns></returns> 131 private static string GetCellValue(IWorkbook workbook, ICell cell) 132 { 133 string value; 134 switch (cell.CellType) 135 { 136 case CellType.FORMULA: 137 HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(workbook); 138 value = evaluator.Evaluate(cell).FormatAsString(); 139 break; 140 default: 141 value = cell.ToString(); 142 break; 143 } 144 return value; 145 } 146 147 /// <summary> 148 /// 设置T属性值 149 /// </summary> 150 /// <param name="t"></param> 151 /// <param name="propName"></param> 152 /// <param name="value"></param> 153 private static void SetValue(ref T t, string propName, object value) 154 { 155 var typeName = t.GetType().GetProperty(propName).PropertyType.Name; 156 var property = t.GetType().GetProperty(propName); 157 switch (typeName) 158 { 159 case "Int32": 160 property.SetValue(t, Convert.ToInt32(value), null); 161 break; 162 case "DateTime": 163 property.SetValue(t, Convert.ToDateTime(value), null); 164 break; 165 case "Decimal": 166 property.SetValue(t, Convert.ToDecimal(value), null); 167 break; 168 default: 169 property.SetValue(t, value, null); 170 break; 171 } 172 } 173 }
3、创建Execl文件映射类
1 public class ReadMapper 2 { 3 [CellAttribute("测试1")] 4 public decimal Code { get; set; } 5 6 [CellAttribute("测试2")] 7 public int Name { get; set; } 8 9 [CellAttribute("测试3", typeof(ClassCellHander))] 10 public string Group { get; set; } 11 12 [CellAttribute("测试4")] 13 public DateTime AddTime { get; set; } 14 }
4、指定Execl文件路径，通过通用处理方法导出映射实体
1 [Test] 2 public void Read1() 3 { 4 const string filePath = @"C:\Users\zk\Desktop\1.xls"; 5 XlsFileHandler<ReadMapper> handler = new XlsFileHandler<ReadMapper>(filePath); 6 List<ReadMapper> readMappers = handler.ToData(); 7 Assert.AreEqual(readMappers.Count, 3); 8 }