Serializer a method just from a specify Controller - Spring, JSON Jackson - json

Question

I have 2 controllers and a get method for a field with custom serialization like as #JsonSerialize(using = MySerialization.class).
But I want to make this serialization just when I call method from A Controller, not from B Controller.
How I can specify this?

Answer 1

Okay, I will assume that you have the follow requestmaps
#RequestMapping(value = "/saveA", method = RequestMethod.GET)
public #ResponseBody Person getPersonA() {
return getPerson();
}
#RequestMapping(value = "/saveB", method = RequestMethod.GET)
public #ResponseBody Person getPersonB() {
return getPerson();
}
private Person getPerson() {
return new Person("Elvis");
}
static class Person {
private String name;
public Person(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
}
So you want to serialize the Person object in different ways at each requestMap, I personally could not found (even see) a Spring Solution for that, I think that is a Jackson and Java problem to be solved, so here is my solution:
Create a Person subclass then customize it as you need, for example
static class CustomPerson extends Person {
public CustomPerson(String name) {
super(name);
}
#JsonSerialize(using = NameSerializer.class)
#Override
public String getName() {
return super.getName();
}
}
static class NameSerializer extends JsonSerializer {
#Override
public void serialize(Object value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
gen.writeString("customSerializer-" + String.valueOf(value));
}
}
Then, all you need to do is create a mapper method, that converts your Person to a CustomPerson
#RequestMapping(value = "/saveB", method = RequestMethod.GET)
public #ResponseBody Person getPersonB() {
return getCustomPerson();
}
private Person getCustomPerson() {
return new CustomPerson(getPerson().getName());
}
Another option is to create the object mapper and serialize the Object as you want when you need it customized:
#RequestMapping(value = "/saveC", method = RequestMethod.GET)
public void getPersonC(HttpServletResponse response) throws IOException {
response.setHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
new ObjectMapper()
.registerModule(new SimpleModule().addSerializer(Person.class, new JsonSerializer<Person>() {
#Override
public void serialize(Person value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
gen.writeStartObject();
gen.writeStringField("name", "Custom-" + value.getName());
gen.writeEndObject();
}
}))
.writeValue(response.getWriter(), getPerson());
}