I have a JSON which has an attribute with its List type. Can someone help me on how to read the value in Apache Velocity template? Following is an example of JSON. The challenge is to read the list of University from JSON and iterate through it.
{
"StudentName":"XYZ",
"List<Univesity>": [
{
"Name": "NYU",
"City": "NY",
"Country":"US",
} ]
}
The solution is dependent upon the JSON library you use, but for many of them, the following code should work:
#set( $universities = $document.get('List<University>') )
#foreach( $university in $universities )
... do something ...
#end
The main point to note here is that you can call any Java method on the object you get.
Also, if the security uberspector is not present, for debugging purposes you can display the Java class name of any object in the context, for instance: $document.class.name should display, in your case, something like com.fasterxml.jackson.databind.node.ObjectNode.
Related
i'm trying to send JSON object to my free marker, but i getting error while testing JUnit
here is my object
{
"filename": "test",
"orderId": "123435",
"orderDate": "23.09.2020г.",
"itemsCount": "4",
"items": [
{
"itemName": "ТВ Приставка 400",
"itemCount": "2 шт Х 400₽",
"itemSum": "800.00"
}
],
"totalSumm": "3000.00"
}
here is my error:
FreeMarker template error:
The value you try to list is an extended_hash+string (org.camunda.bpm.engine.impl.util.json.JSONArray wrapped into f.e.b.StringModel), thus you must specify two loop variables after the "as"; one for the key, and another for the value, like <#... as k, v>).
how could i resolve it?
items is a arrays of JSON objects
FreeMarker knows nothing about org.camunda.bpm.engine.impl.util.json.JSONArray, so it doesn't see it as a list-like thing (as a sequence, as it's called in FTL). So you can do one of these:
Using the objectWrapper Configuration setting, you teach FreeMarker how to treat JSONArray as a list. (You can find more about custom ObjectWrapper-s elsewhere.) Then you can just #list such objects, and use all the other operations applicable to sequences.
Or, you call the Java API-s of JSONArray from the template. That will be less convenient of course, but requires no prior investment.
Please consider a MongoDB collection with the following document:
"_id": "clientsInfo"
"data": {
"clientsList" : [
{
"name" : "Mike",
"country" : "USA"
},
...
]
}
After setting the DataSet and defining the Query like this...
{
collectionName:'projectA',
findQuery: {
'_id':'clientsInfo',
},
findFields: {
'_id':0,
'data.clientsList':1
},
}
...I am able to display the first item of the fetched array (java.util.List type) in JasperSoft Studio inside a Text Field using the following expression:
$F{data.clientsList}.get(0)
But, considering that I would like to exhibit the whole data in a Name/Country Table...
Question1: How could I access any of the dictionary fields? Trying get method I obtain The method get(String) is undefined for the type Object. error. However, knowing that the object is an instance of com.mongodb.BasicDBObject it should have that method inherited (See doc).
I have also tried to cast object to org.json.JSONObject but then I get net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression for source text: (JSONObject)$F{data.clientsList}.get(0) error.
Question2: Let's suppose we have already solved first question... How can I iterate the list to access not only the first item but all of them according to the array length? Is it possible to use for-loop sentence inside the JasperSoft Expression Editor? (if-then-else seems to be available)
Thanks in advance, Any clue that point me in the right direction will be appreciated.
Just in case someone was in the same situation as I was, I must say this whole approach was wrong.
It's not about making a simple query which returns big block of complex data formatted as an object or list of objects and then manipulate it with JasperSoft Studio. Instead, what I had to do was design a more elaborated query which returns the simple fields I wanted to use straightforward. How to do this? By using Aggregation Framework.
So, by changing this...
{
collectionName:'projectA',
findQuery: {
'_id':'clientsInfo',
},
findFields: {
'_id':0,
'data.clientsList':1
},
}
...for this...
{
runCommand: {
aggregate : 'projectA',
pipeline : [
{'$match': {'_id':'clientsInfo'}},
{'$project': {'data.clientsList': 1}},
{'$unwind': '$data'},
{'$unwind': '$data.clientsList'}
]
}
}
...is how I get name and country fields in order to use them in Text Fields, Tables, ...etc.
Given a Json, is it possible to use Jackson to only parse out a section of the message?
Say that the data I'm interested in is buried in a deep hierarchy of fields and I simply do not care about creating DTO classes for each and every class.
Given a very simplified scenario I'd like to model the Telephone class without knowing anything about the structure before it:
...{
"firstName": "John",
"lastName" : "doe",
"age" : 26,
"address" : {
"streetAddress": "naist street",
"city" : "Nara",
"postalCode" : "630-0192"
},
"phoneNumbers": [
{
"type" : "iPhone",
"number": "0123-4567-8888"
},
{
"type" : "home",
"number": "0123-4567-8910"
}
]
}....
I'm thinking something in the terms of using json-path together with deserializing just the parts I'm interested of. Some pseudo:
List<Telephone> phoneNrs = parse(".my.deep.structure.persons.phoneNumbers", List<Telephone.class>);
ObjectMapper mapper = new ObjectMapper();
JsonNode json = mapper.readTree("... your JSON ...");
Using the JsonNode object you can then call get("my").get("deep").get("structure") to get the node you want.
Once you got your hands on that node, a simple call to mapper.treeToValue(myDeepJsonNode, Telephone[].class) will get you your array ofTelephone. You can get a list using a TypeReference as well.
To get to your deep JsonNode you can also use the findValue and findPath methods.
The Javadoc:
https://fasterxml.github.io/jackson-databind/javadoc/2.2.0/com/fasterxml/jackson/databind/JsonNode.html
Yes, it is possible the way you have mentioned in the Pseudo code. "phoneNumbers" is a key and value returned can be passed on to Jackson deserialiying.
If the response is an array of maps then you can iterate through each one of them and use the yourResponseAsJSONObject.get('phoneNumbers') method to get the value and pass it on to Jackson
or use JsonPath as mentioned by #dimas
You can use JsonPath library. With this library you can map your JsonPath output directly into POJO's.
Pseudo:
List<Telephone> phoneNrs = JsonPath.parse(json).read("$.my.deep.structure.persons.phoneNumbers", List.class);
To do this efficiently with Jackson, use the Streaming API via the JsonParser class (http://fasterxml.github.io/jackson-core/javadoc/2.5/com/fasterxml/jackson/core/JsonParser.html).
This approach will allocate no additional memory and will not incur the cost of deserializing values for all of the skipped data. Since the code will be much longer and more difficult to read than using Jackson's ObjectMapper, only do this if profiling shows unacceptable GC activity or CPU usage during parsing.
You can skip all of the nodes that you are uninterested in until you hit the "phoneNumbers" key. Then you can call the readValueAs function to deserialize the array of phone number dictionaries like so readValueAs(new TypeReference<MyPhoneNumberType[]>()).
See also:
a tutorial on reading and writing with JsonParser: http://www.cowtowncoder.com/blog/archives/2009/01/entry_132.html
The main documentation: https://github.com/FasterXML/jackson-core
Let's say that we have the following json response:
{
"data":
[
{
"id": 1,
"name": "Pablo"
},
{
"id": 2,
"name": "Ernesto"
}
]
...
}
Where the data list could consist of many more objects. If I where to verify that no name field is set to null, what would be the Rest Assured way of doing this?
Now I'm using:
from(response.asString()).get("data");
to get a list of HashMaps, and then moving on from there for each entry. But I guess there is some other way that is more efficient?
Edit/Clarification: I am wondering if there is a way to do this without the creation of a list of maps?
i guess this is the best we can do
List<HashMap> data = from(response.asString()).get("data");
for(HashMap map: data){
if(map.get("name") == null){
// null name found
}
}
// No null name found
Ok, so perhaps I should have read the docs a bit more carefully, the easiest (and intended) way to retrieve e.g. all name values (as in my example) is to use JsonPath like so:
List<Object> names = from(response.asString()).get("data.name");
So there are no magical utility methods within the Rest-Assured library to do this except using JsonPath.from().get() and then to go from there.
I am working on a Spring MVC and I want to insert javascript into the html output for analytics purpose. I am only partially familiar with serialization but I figured it does the job nicely rather than manually constructing a string containing javascript.
Would it be possible to generate something the following snippet? Any pointers would be great!
"emd" : new Date('6/6/2014')
Update:
I need to output a javascript object which has many fields which may be complex. Hence, on the backend I am gathering all the data into java beans with all the information and I plan to use Jackson mapper to convert to string that I can just output through JSP.
Generating the above snippet does not seem straightforward though, not sure if it is even possible. For context, the rest of that javascript looks something like this.
Analytics.items["item_123"] = {
//ratings and reviews
"rat" : a.b, //the decimal value for the rating
"rev" : xxxx, //integer
//list of flags that indicate how the product was displayed to the customer
//add as needed...tracking code will pick up flags as needed when they are available
"dec" : ["mbe", "green", "recycled"],
//delivery messaging
"delivery" : {
"cd" : new Date() //current date
"offers" : [{
"type" : "abcd"
"emd" : new Date('6/6/2014'),
"weekend" : true
}
]
},
};
JSON.stringify should do the trick. It will be built into your browser, unless you're using a very old browser, in which case you can use a polyfill.