using System.Data;
using System.IO;
using NPOI.SS.UserModel;
using System.Text;/// <summary>
/// 获取json字符串的类
/// </summary>
public class GetJson
{/// <summary>/// 得到DataTable的方法/// </summary>/// <param name="filePath">传入Excel所在的路径</param>/// <param name="tableName">传入Table的name</param>/// <returns></returns>public static DataTable GetTable(string filePath, string tableName){DataTable table = new DataTable(tableName);if (File.Exists(filePath)){using (FileStream fStream = File.OpenRead(filePath)){IWorkbook workBook = WorkbookFactory.Create(fStream);ISheet sheet1 = workBook.GetSheetAt(0);IRow headRow = sheet1.GetRow(0);int cellCount = headRow.LastCellNum;for (int m = headRow.FirstCellNum; m < cellCount; m++){string headCellValue = headRow.GetCell(m).StringCellValue;table.Columns.Add(headCellValue);}int rowCount = sheet1.LastRowNum;for (int i = (sheet1.FirstRowNum + 1); i < rowCount + 1; i++){DataRow dataRow = table.NewRow();IRow row = sheet1.GetRow(i);for (int j = row.FirstCellNum; j < cellCount; j++){if (row.GetCell(j) != null)dataRow[j] = row.GetCell(j).ToString();}table.Rows.Add(dataRow);}}}return table;}/// <summary>/// 得到json字符串的类/// </summary>/// <param name="dt">传入要生成json字符串的Table</param>/// <returns></returns>public static string GetJsonStr(DataTable dt){StringBuilder jsonBuilder = new StringBuilder();int count = dt.Rows.Count;if (count != 0){jsonBuilder.Append("{");jsonBuilder.Append("\'");//for (int j = 0; j < dt.Columns.Count; j++)//{//    jsonBuilder.Append(dt.Rows[i][0].ToString());//    break;//}
            jsonBuilder.Append(dt.TableName);jsonBuilder.Append("\'");jsonBuilder.Append(":");jsonBuilder.Append("[");for (int i = 0; i < dt.Rows.Count; i++){//jsonBuilder.Append("\'");//for (int j = 0; j < dt.Columns.Count; j++)//{//    jsonBuilder.Append(dt.Rows[i][0].ToString());//    break;//}//jsonBuilder.Append("\'");//jsonBuilder.Append(":");jsonBuilder.Append("{");for (int j = 0; j < dt.Columns.Count; j++){jsonBuilder.Append("");jsonBuilder.Append("\'");jsonBuilder.Append(dt.Columns[j].ColumnName);jsonBuilder.Append("\'");jsonBuilder.Append(":");if (!IsNum(dt.Rows[i][j].ToString())){jsonBuilder.Append("\'" + dt.Rows[i][j].ToString() + "\'");}else{jsonBuilder.Append(dt.Rows[i][j].ToString());}jsonBuilder.Append(",");}jsonBuilder.Remove(jsonBuilder.Length - 1, 1);jsonBuilder.Append("},");}jsonBuilder.Remove(jsonBuilder.Length - 1, 1);jsonBuilder.Append("]");jsonBuilder.Append("}");return jsonBuilder.ToString();}else{return null;}}/// <summary>/// 判断是否为数字/// </summary>/// <param name="number">要判断的string字符串</param>/// <returns>true/false</returns>private static bool IsNum(string number){try{for (int i = 0; i < number.Length; i++){if (!char.IsNumber(number, i)){return false;}}return true;}catch{return false;}}
}