Returning XML/JSON in Jersey

Question

@GET @Path("/ids/{printerid}")

@Produces({"application/json", "application/xml"})

public Printer getPrinter(@PathParam("printerid") String printerId) { ... }

is a piece of a code example found here: https://jersey.java.net/documentation/latest/jaxrs-resources.html#d0e2089

What I understand is:

the method
getPrinter
is called when the
HTTP method GET
is called on the path
/ids/{printerid}

the method
Produces
either a
json
or an
xml
result

the method returns an
Object
of type Printer, identified by the ID provided in the
URI

What I don't understand is, how the returned Printer is represented as an

xml/json

document. We return a Printer in this method, so how do we get an

xml/json

file from that?

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Answer 1

This is the whole idea of Jersy layer / spring controller, they encapsulate it and convert the class to JSON. You can have the same result with Gson

Gson gson = new Gson();
String json = gson.toJson(printerObject);
System.out.println(json);

Not sure if Jersy is using Gson, but the logic will be probably the same

Returning XML/JSON in Jersey

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