I need comunicating using java with a WebService that uses the WSDL technology.
I tried some libraries but with no success, thus, I decided to do it manually.
My plan is getting a .xml which uses the comunication (filtering with fiddler for example) and copy it manually building a string. So the .xml will be ok. Do I need to take care of anything else?
Do I have to do any more? Http request, response?
I wouldn't like to create all the structure for the xml and after that, find that I can't continue the comunication.
Thanks
Java comes with a complete API for XML Web Services, this is JAX-WS. (lot of documentation available with a simple serach with google)
it allows developers to build a working client with very little effort starting from a WSDL file (seems your case)
I really discourage you to build the client by yourself. You should care about SOAP message building, message sending, response parsing and so on.
Related
I want to write a java client to use some medical api. On there website they have uploaded a bunch of WSDL files and corresponding XSD files, along with documentation explaining the SOAP messages format to consume each service.
In past I have used REST API of Amazon and Azure to write java client but this seems to be different.
I have read about JAX-WS and also tried to create a dynamic web project in Eclipse using Tomcat but nothing working (https://wiki.eclipse.org/Creating_a_Java_Web_Service_Client).
Could some one explain me basic steps on how to write a simple java
client to **consume these WSDL and XSD files using SOAP messages** and
point me to really good tutorial where I can understand the underlying
concepts?
Till now:
I read about basic wsdl and xsd structure.
Tried to use Postman and SoapUI to make service call to these services.
But struggling to make first step towards making a simple java client project to interact with these services.
I would recommend you go check SAAJ API
I was wondering if it was actually possible to create a Java SOAP Webservice without using it's WSDL.
Context:
The idea is that I have to mock a webservice, so I have its WSDL. The mock will only read the soap request, search if there are any similar request (as key in a map) and send the matching response (as its value). This is for automated testing purpose. The problem is not the "map" part.
Anyway, I've been using Axis and eclipse to generate classes and files and load them in tomcat from the WSDL. So far it've been a mess, with a lot of compatibility issues between these components. And it's gonna be much more difficult to compare the input or serialize the output to do what I want this way.
I thought about creating a REST endpoint and send the soap request through it (so I would directly get the SOAP request !), but I rode somewhere that soap request weren't valid and wouldn't be retreived by the REST endpoint... Also, won't the client application throw an error if there is no WSDL at this address ?
My question is:
Is there a way to create an access point, that looks like a SOAP Webservice (from clients), but which allows me to get the full soap request (as a String for example) and send a response (still as a String) inside a Java app?
Complements:
I'm looking for something, a library, maybe just an annotation on Servlets, that doesn't needs (if possible) to generate a huge load of classes and xml files everywhere. The app would be running on tomcat (but I can be a basic Java app). Using maven and spring wouldn't be a problem.
Thanks in advance !
Normally, clients do not require an WSDL. But it is a nice feature - use a normal servlet and handle the "?WSDL" manually. Then use some simple XPath or parse logic to extract the payload as a DOM document.
I need to implement web services, send json to a server and read the response. All of the requests are send to the service https://api.polldaddy.com/
This will take place within a web application. This is the api I have to implement :
http://support.polldaddy.com/api/
It seems straightforward, just send some json to the server and consume the json response that is sent back. There seems to be so many options of doing this task that its a little daunting where to start ?
So, where is the best place to start in learning how to implement this service, ie : send json to a server and consume the response.
First of all, you are using the wrong terminology. "Implement web services" implies you will create a service, it sound like you just want to call a web service. You could say "leverage web services" if you need it to be business speak complaint.
The harder way. If you can't add on any additional libraries use java.net.HttpURLConnection.
The easier way. If you can add libraries use the Jersey client API. http://jersey.java.net/nonav/documentation/latest/user-guide.html#client-api
Java EE 7 will include an official client API, EE 6 only included the REST server-side API.
But you should prefer the XML content over the JSON content yourself. JSON is great because it is easy for JavaScript to parse. Java has more ways to parse XML than it does JSON. If you really want to use JSON you could look at something like http://jettison.codehaus.org/
If there is no JAVA API already written I would go for a JAX-RS approach with a client framework like jersey client. Look at http://jersey.java.net/nonav/documentation/latest/client-api.html.
Since you're creating a web app that needs to do HTTP request handling... Start with either Tomcat or Jetty, and Apache HTTP Client, and use a JSON library such as available from json.org.
If you are familiar with maven, you could get all this wrapped up and building within 10 minutes. Otherwise, you'll have to build the webapp and handle dependencies yourself.
If you are on Java EE 7 and want to use the included JAX-RS 2.0 API then have a look at https://github.com/tobiasdenzler/jee7-rest-crud. Its a simple CRUD project using JSON.
(I am fairly new to web services, kindly excuse any incorrect terminology)
Given a WSDL URL, how does one determine what methods are available in that web service by looking at the source of the WSDL file?
Also, how does one construct a SOAP response to use with the WSDL file to post data back to the web service?
I think what you ask is how to interpret a wsdl. Following articles[1][2] may help you.
[1] http://wso2.org/library/2873
[2] http://wso2.org/library/2935
Unlike the others, I'm not going to go into details about the WSDL file and how you can read it. You will eventually learn all of that by yourself by reading books, articles, experimenting with web services etc.
What I'm going to do is recommend you a very simple to use, yet powerful tool, than must be in the toolbox of every web service developer (especially someone new to web services): SoapUI.
You create a simple project in SoapUI and point it to the WSDL file of the web service. It will discover the operations, create sample request and response messages, create mocks of the web service and much more.
You can then look at the WSDL code and with the help of what's presented inside SoapUI discover which elements are involved in each method.
Just open this url to WSDL (looks like http://host:port/ddfdgfgd?wsdl) in your browser or download it to file.
Find all WSDL sections portType (portType is similar Java interface). All WSDL port types contains operations linked to input/output messages. These messages linked with XSD elements or types (it depends SOAP encoding type).
Also you can import WSDL with Java with wsimport command line tool and implement client or server side.
im starting with web services. I'm working in a project that needs to communicate Android with a web server and I'd like to save some time chosing the appropriate protocol for the communication.
Between JSON ,REST and SOAP:
Which ones can I run in a non-dedicated server?
Whats the best choice for a high trafic server?
Thanks in advance
JSON and REST are not mututally exclusive. JSON is a data format that the REST interface can return.
You may run either on a non dedicated server. I would personally choose REST for rapid prototyping on Android as it is easier to get up and running. (With SOAP you will probably want to have a schema which takes time to put together)
There's a good comparison between REST and SOAP on the REST wiki article: http://en.wikipedia.org/wiki/Representational_State_Transfer#Concept
REST is more of a framework than a communications protocol. JSON and SOAP could be use to create a RESTful application.
If you're writing something with many resources, I'd use REST as it is far more structured. There are also a lot of libraries that will set most of things up for you. I find JSON and SOAP are better for custom functionality that you want to hack together quickly. They can be lightweight, but less structured.