I'm supposed to parse information from a JSON string to build a UI for an app. However the data contains hypermedia (HATEOAS) instead of the more traditional approach of having all the data in the JSON string. How would I go about fetching this info in LWUIT or CodenameOne?
//Sample response:
{
"user_details": "https://mysite.io:8085/users/15",
"user_roles": "https://mysite.io:8085/users/15/roles",
"allocations": "https://mysite.io:8085/allocations/15"
}
Codename One has a builtin JSONParser class that can parse such responses easily. It also has some 3rd party classes to parse JSON.
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I am developing ios app which is getting data from Google endpoint ,the data is base 64 encoded on the server to a custom java object, which is then returned by the endpoint method.
On the iOS side I am able to receive the data and print the data using the generated client code.
I am facing a problem and I am unable to decode the data back in to the GTL**** endpoint auto generated class.
The decoded data shows up with some hex numbers:
My Code:
let respo2 = GTLDecodeBase64(responce) as? GTLEndpointStatusCollection
I also tried decoding using the swift classes:
let respo = NSData(base64EncodedString: responce, options: NSDataBase64DecodingOptions(rawValue: 0))
The input is base64 encoded : rO0ABXNyABNqYXZhLnV0aWwuQXJyYXlMaXN0eIHSHZnHYZ......
The desired output should have been readable data,
but instead im getting:
<aced0005 73720013 6a617661 2e757469 6c2e4172 7261794c.....
I even tried encoding, decoding the base64 decoded data with NSUTF8
but no use.
What am I doing wrong? Is it possible for data encoded on Server in Java (with custom Java objects) to be decoded back ? (I understand Google endpoint does the serialization/deserialization in between)
Thanks in advance.
You should use JSON for serialization rather than manually converting the object to a bytestring and base64 encoding it. If you are using the Endpoints libraries this is automatically done for you, simply by returning the object in your method. See the docs here for an example and the rest of the Endpoints docs for more details. To consume the API you can use the generated iOS libraries which also do this for you as per the examples here. You won't actually see any JSON unless you inspect the HTTP traffic or use the API Explorer.
It sounds like you might just be doing more work than is needed by pre-encoding the object, rather than just letting Endpoints do it for you. If you really need to manually serialize an object to some property you can use a library on the Endpoints side like Jackson to serialize the object to a string property and NSJSONSerialization on the client to convert it back to an object.
Issue: How to correlate messages for an aggregator based on a XML value in the payload? I have a scenerio where I call a third party application and it only gives back an xml response. Based on an xml value in the payload I would like to correlate the messages to produce a single response back to the consumer.
Example using Header Attribute
#CorrelationStrategy
public Object correlate(Message message) throws JMSException {
return message.getHeaders().get("JMSXUserID");
}
Solution Notes:
As described below and referenced in the spring documentation for xml payload support.
http://docs.spring.io/spring-integration/reference/html/xml.html#xpath-spel-function
Sample Config Applied:
<aggregator
id="agg"
input-channel="jmsInChannel"
output-channel="outputChannel"
ref="AggregatorPOJO"
method="combineResponesMessages"
correlation-strategy-expression="#xpath(payload, '/test/name')"
release-strategy="AggregatorPOJO"
release-strategy-method="isComplete"/>
This will correlate the following xml.
<test><name>test1</name></test>
Take a look if #xpath() SpEL function can help you, for example:
correlation-strategy-expression="#xpath(payload, '/name')"
where payload is a payload in some XML representation of messages to correlated and /name is an XPath against that payload.
You should be sure that spring-integratrion-xml jar is on your CLASSPATH.
You would have to parse the XML; you might be able to use a simple regex Pattern or you might have to convert the payload to a DOM for more complex situations.
I need to create a ReST service using Jersey 2.0. I need to send multiple documents and metadata to the client.
What is the best approach do to the achieve this.
I was able to send a MultiPart response from the server , but not sure how to read this from the client code
Let's say you have a document called "document1" which you want to get via your client.
In your REST-API your unique identifier for the document (the resource) could be:
http://example.com/restapi/documents/document1
As you want to READ data you do a HTTP-GET Request to that uri.
And here comes the important part for you: A resource can have multiple representations - meta data and binary data in your case.
So the client has to tell the server which representation type to get (content negotiation). This information can be set in the ACCEPT Header of the client request for instance.
You can use the content type "application/json" as a representation for the meta data.
Unfortunately you didn't tell us what kind of binary data you want to send.
If they are PDFs the content type would be "application/pdf" for instance. If the binary data doesn't have a specific type you can use "application/octet-stream".
Of course there is work to be done on the server side too. Here an example:
#Path("/documents/{documentname}")
public class docResource {
#GET #Produces("application/json")
public Response getDocumentMetaData(#PathParam("documentname") String docName) {
// Create a Response containing a json
}
#GET #Produces("application/pdf")
public Response getDocumentBinaryData(#PathParam("documentname") String docName) {
// Create a response containing the binary data
}
...
}
Jersey will check the accept header of the client and will run the appropriate method.
Also see: https://jersey.java.net/documentation/latest/jaxrs-resources.html
If you are using jersey with jackson you can also easily marshal a POJO to JSON and visa versa:
http://examples.javacodegeeks.com/enterprise-java/rest/jersey/json-example-with-jersey-jackson/
If you are not sure what to do in the "getDocumentBinaryData"-Method - checkout this simple example from mkyong:
http://www.mkyong.com/webservices/jax-rs/download-excel-file-from-jax-rs/
I have a REST controller whice should return a list of companies in json format. The companies are fetched by a service. Where should i encode the result into json format? I tought of an encoder class, but where should i inject that?
PHP Offers JSON encoding / decoding functionality built in:
http://php.net/manual/en/function.json-encode.php
$json_result = json_encode($array_to_be_encoded);
I've generated the web service client in eclipse for the OpenCalais WSDL using the "develop" client type. Actually I was following this post so not really going in detail. Now when I get the results this way: new CalaisLocator().getcalaisSoap().enlighten(key, content, requestParams);, I get the String object, containing the response XML. Sure it's possible to parse that XML, but I think there must be some way to do it automatically, e.g. getting the response object in the form of some list whatsoever?
The response from the SOAP interface is already parsed. The englighten() method returns an XML string. When you call it with SOAP, this response is wrapped within even more XML. The SOAP library already parses the outer SOAP XML and returns the result of the enlighten() method, which is also XML.