Jython and SOAP Example
Submitted by Claude Falbriard
I´ve integrated the APACHE SOAP package which provides a simple client for SOAP protocol. The sample program, listed below, delivers a "Currency Converter" in real-time . The webservice is available for public access from a site called: xmethods.net.
The APACHE "soap.jar" library, was downloaded from Apache and goes into the /ext directory of the application server.
Sample - Currency converter using SOAP
Type the name of two countries (english). Result: Conversion rate between two given countries.
Public webservice provided by : xmethods.net
from java.lang import *
from java.net import URL
from java.io import IOException
from java.io import PrintWriter
from java.io import Writer
from java.util import Vector
from java.util import Properties
from java.util import Locale
from java.util import ArrayList
from java.text import NumberFormat
from time import time, ctime
from javax.servlet import ServletException
from javax.servlet import http
from javax.servlet.http import Cookie
from javax.servlet.http import HttpServlet
from javax.servlet.http import HttpServletRequest
from javax.servlet.http import HttpServletResponse
from org.apache.soap.util.xml import *
from org.apache.soap import *
from org.apache.soap.rpc import *
from java.lang import String as javaString
class SOAPCurrency(http.HttpServlet):
head = "<head><title>SOAPCurrency</title></head>"
title = "<center><H2>%s</H2></center>"
def doGet(self,req, res):
res.setContentType("text/html; charset=iso-8859-1")
out = res.getWriter()
out.println('<html>')
out.println(self.head)
out.println("<body background='papyrus.gif' text='DimGray'>")
out.println("<h2>Currency Converter</h2><br>")
out.println("<form method=\"POST\" action=\"" +
req.getContextPath() + req.getServletPath() + "\">")
out.println("Country1: <input type=\"text\" name=\"country1\" value=\"\"><br>")
out.println("Country2: <input type=\"text\" name=\"country2\" value=\"\"><br>")
out.println("URL: <input type=\"text\" name=\"endpointURL\" value=\"https://services.xmethods.net:80/soap\"><br><br>")
out.println("<input type=\"submit\" value=\" Get \"><br>")
out.println("</form>")
out.println("<font size='-1'>")
out.println('<i> ')
out.println('powerd by: Java, Jetty and Jython<i><br><br>')
out.println('<i>by: IBM Brazil, dept.: GS AMS, autor: Claude Falbriard, version: 1.0 <i></font><br>')
out.println("</font>")
out.println('</center></body></html>')
def doPost(self, req, res):
res.setContentType("text/html; charset=iso-8859-1");
out = res.getWriter()
try:
out.println('<html>')
out.println(self.head)
out.println("<body background='papyrus.gif'>")
out.println("<font face='verdana' color='DimGray' size='-1'>")
out.println(self.title % "SOAPCurrency - reply")
# read Post
# SOAP provider
url = req.getParameter("endpointURL")
System.out.println("endpointURL = " + url)
if url == None or len(url) == 0:
# use hardcoded SOAP provider
url = "https://services.xmethods.net:80/soap"
endpointURL = URL(url)
country1 = req.getParameter("country1")
country2 = req.getParameter("country2")
System.out.println("country1 = " + country1)
System.out.println("country2 = " + country2)
# Initialize pseudo-constants
encodingStyleURI = Constants.NS_URI_SOAP_ENC
soapAction = ""
# Create call
call = Call()
# Service uses standard SOAP encoding
encodingStyleURI = Constants.NS_URI_SOAP_ENC
call.setEncodingStyleURI(encodingStyleURI)
call.setTargetObjectURI("urn:xmethods-CurrencyExchange")
call.setMethodName("getRate")
# Create input parameter vector
params = Vector()
myString = javaString("")
params.addElement (Parameter("country1", myString.class, country1, None));
params.addElement (Parameter("country2", myString.class, country2, None));
call.setParams(params)
# Send the start of the response
response = call.invoke(endpointURL, soapAction)
# Print response
if response.generatedFault() == 1:
fault = response.getFault()
out.println("SOAP call generated a fault: " + fault.toString())
else:
result = response.getReturnValue()
float_value = result.getValue()
value_str = str(float_value)
out.println("Current rate for " + country1 + " " + country2 + " is " + value_str)
out.println("</BODY></HTML>")
out.close()
System.out.println("SOAPCurrency.py - end of query ")
# Catch - SOAP exception
except SOAPException, e:
errorfound = String.valueOf(e)
errorfound_str = str(errorfound)
out.println("<BR>SOAP exception: " + errorfound_str)
out.println("<BR></BODY></HTML>")
System.out.print("SOAP exception: " + errorfound_str)
out.close()
# Catch Java Exceptions
except Throwable, e:
errorfound = String.valueOf(e)
errorfound_str = str(errorfound)
out.println("<BR>Java exception error " + errorfound_str)
out.println("<BR></BODY></HTML>")
System.out.print("Java exception error " + errorfound_str)
out.close()
# Catch Jython Exceptions
except Exception, e:
errorfound = String.valueOf(e)
errorfound_str = str(errorfound)
out.println("<BR>Jython run-time exception error " + errorfound_str)
out.println("<BR></BODY></HTML>")
System.out.print("Jython run-time exception error " + errorfound_str)
out.close()
# Catch unexpected errors
except:
System.out.print("Unexpected Python language error:")
out.println("Unexpected Python error:")
out.close()
raise