Add JSON or XML Data from a Web Service

XML example

import clr
clr.AddReference('System.Data')
import System
from System import DateTime
from System.Data import DataSet, DataTable, XmlReadMode
from System.IO import StringReader, StreamReader, StreamWriter, MemoryStream, SeekOrigin
from System.Net import HttpWebRequest
from Spotfire.Dxp.Data import DataType, DataTableSaveSettings
from Spotfire.Dxp.Data.Import import TextFileDataSource, TextDataReaderSettings

# get stock quotes data in XML format from Yahoo Finance API
tickerSymbol = Document.Properties["TickerSymbol"]
startDate = DateTime.Today.AddMonths(-3).ToString("yyyy-MM-dd")
endDate = DateTime.Today.ToString("yyyy-MM-dd")
uri = "http://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.historicaldata where symbol = %22" + tickerSymbol + "%22 and startDate = %22" + startDate + "%22 and endDate = %22" + endDate + "%22&format=xml&diagnostics=true&env=store://datatables.org/alltableswithkeys"
webRequest = HttpWebRequest.Create(uri)
response = webRequest.GetResponse()
streamReader = StreamReader(response.GetResponseStream())
xmlData = streamReader.ReadToEnd()
stringReader = StringReader(xmlData)

# read desired data fields from XML into a DataSet
dataSet = DataSet()
dataTable = DataTable("quote")
dataTable.Columns.Add("Date", System.String)
dataTable.Columns.Add("Close", System.String)
dataSet.Tables.Add(dataTable)
dataSet.ReadXml(stringReader, XmlReadMode.IgnoreSchema)

# build a string representing the data in tab-delimited text format
textData = "Symbol\tDate\tClose\r\n"
for row in dataTable.Rows:
textData += tickerSymbol + "\t" + "\t".join(row.ItemArray) + "\r\n"

# make a stream from the string
stream = MemoryStream()
writer = StreamWriter(stream)
writer.Write(textData)
writer.Flush()
stream.Seek(0, SeekOrigin.Begin)

# set up the text data reader
readerSettings = TextDataReaderSettings()
readerSettings.Separator = "\t"
readerSettings.AddColumnNameRow(0)
readerSettings.SetDataType(0, DataType.String)
readerSettings.SetDataType(1, DataType.Date)
readerSettings.SetDataType(2, DataType.Currency)

# create a data source to read in the stream
textDataSource = TextFileDataSource(stream, readerSettings)

# add the data into a Data Table in Spotfire
if Document.Data.Tables.Contains("Stock Data"):
Document.Data.Tables["Stock Data"].ReplaceData(textDataSource)
else:
newTable = Document.Data.Tables.Add("Stock Data", textDataSource)
tableSettings = DataTableSaveSettings (newTable, False, False)
Document.Data.SaveSettings.DataTableSettings.Add(tableSettings)


JSON example

import clr
clr.AddReference('System.Data')
clr.AddReference('System.Web.Extensions')
import System
from System import DateTime
from System.Data import DataSet, DataTable
from System.IO import StreamReader, StreamWriter, MemoryStream, SeekOrigin
from System.Net import HttpWebRequest
from System.Web.Script.Serialization import JavaScriptSerializer
from Spotfire.Dxp.Data import DataType, DataTableSaveSettings
from Spotfire.Dxp.Data.Import import TextFileDataSource, TextDataReaderSettings

# get stock quotes data in JSON format from Yahoo Finance API
tickerSymbol = Document.Properties["TickerSymbol"]
startDate = DateTime.Today.AddMonths(-3).ToString("yyyy-MM-dd")
endDate = DateTime.Today.ToString("yyyy-MM-dd")
uri = "http://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.historicaldata where symbol = %22" + tickerSymbol + "%22 and startDate = %22" + startDate + "%22 and endDate = %22" + endDate + "%22&format=json&diagnostics=true&env=store://datatables.org/alltableswithkeys"
webRequest = HttpWebRequest.Create(uri)
response = webRequest.GetResponse()
streamReader = StreamReader(response.GetResponseStream())
jsonData = streamReader.ReadToEnd()
js = JavaScriptSerializer()
dataDict = js.Deserialize(jsonData,object)

# build a string representing the data in tab-delimited text format
textData = "Symbol\tDate\tClose\r\n" 
for quote in dataDict["query"]["results"]["quote"]:
     textData += tickerSymbol + "\t" + quote["Date"] + "\t" + quote["Close"] + "\r\n"

# make a stream from the string
stream = MemoryStream()
writer = StreamWriter(stream)
writer.Write(textData)
writer.Flush()
stream.Seek(0, SeekOrigin.Begin)

# set up the text data reader
readerSettings = TextDataReaderSettings()
readerSettings.Separator = "\t"
readerSettings.AddColumnNameRow(0)
readerSettings.SetDataType(0, DataType.String)
readerSettings.SetDataType(1, DataType.Date)
readerSettings.SetDataType(2, DataType.Currency)

# create a data source to read in the stream
textDataSource = TextFileDataSource(stream, readerSettings)

# add the data into a Data Table in Spotfire
if Document.Data.Tables.Contains("Stock Data"):
     Document.Data.Tables["Stock Data"].ReplaceData(textDataSource)
else:
     newTable = Document.Data.Tables.Add("Stock Data", textDataSource)
     tableSettings = DataTableSaveSettings (newTable, False, False)
     Document.Data.SaveSettings.DataTableSettings.Add(tableSettings)

Source: http://spotfire.tibco.com/tips/2014/03/03/streaming-xml-and-json-data-from-the-web-directly-into-spotfire-clients-using-script-controls/