Dynamic JSON Object using responce entity - Spring

Question

I am using return ResponseEntity of Spring to return HTTP response.

While passing POJO or MAP in entity, it converts that to JSON Object. Like

  return new ResponseEntity<Object>(result, HttpStatus.OK);

result may be POJO class. (getter and setters)

I am using

 <bean id="jsonMessageConverter" class="org.springframework.http.converter.json.GsonHttpMessageConverter ">
</bean>

Now what i want is, i will get a list of response fields in request. I just want to response the request with those fields only.

For Ex, if i receive the response fields as name,id. Then the object must contain those two only.

 {
 "name":"test",
 "id":15
 }

i can't able to use @jsonignore or @explore annotations. B'Coz i want the JSON to be done dynamically using coding.

May be by overriding the GSON convertor methods or using AOP.

Is there any way to configure the adapter of jackson to create the object based on the fields.

You mean you want to sent response that is a object containing what values you have received in request correct ? Is number of request values is fixed or dynamic ? — Manish Prajapati
– Manish Prajapati, Commented Sep 10, 2015 at 12:15
s exactly. what are all the fields in the request need to be sent as object (POJO already have those fields. But lot other than that. we need to exclude). It is dynamic. We don't know what will come. — user1677237
– user1677237, Commented Sep 10, 2015 at 12:22
Ya no problem. may use jackson as well. Is there any way to do in jackson. Actually, first i used jackson only. For this only i shifted to GSON. — user1677237
– user1677237, Commented Sep 10, 2015 at 12:37
Is POJO class created dynamically? Or you just want to ignore null values? — jny
– jny, Commented Sep 10, 2015 at 13:37

Martin Frey · Accepted Answer · 2015-09-10 12:40:14Z

1

If you can switch to jackson probably you can use this little extension i wrote for exactly this purpose:

https://github.com/Antibrumm/jackson-antpathfilter

answered Sep 10, 2015 at 12:40

Martin Frey

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7 Comments

user1677237 Over a year ago

Thanks martin. As per your examples in github, i have to add objectmapper in every method, which works after conversion . I there anyway to tell jackson before converting.

Martin Frey Over a year ago

I did create a spring bean encapsulating the neccessary code with a helper method. bean.write(obj, "filters",...). I did not yet try to incorporate it with responsebody. My controllers return a string directly.

Martin Frey Over a year ago

The mixin configuration can be done only once as it works on Object. In the @PostConstruct of the spring bean for example.

user1677237 Over a year ago

Ok. What about objectmapper. Can we configure that to achieve this.

Martin Frey Over a year ago

I think i will add an example on the github readme. Give me some time ;)

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