如何正确获取WebTarget获取请求响应（JAX-RS）的主体？

Question

How do i get the body of a HTTP get request with the javax.ws.rs library?

I tried:

Response response = service.path(path).request().get();
String body = response.readEntity(String.class);

but that doesn't work. Instead i get this exception: java.lang.NoClassDefFoundError: javax/ws/rs/core/NoContentException

Then i tried:

Response response = service.path(path).request(MediaType.APPLICATION_JSON_TYPE).get();
String body = response.readEntity(JSONObject.class);

because I should actually get a JSON String back but i don't need it as JSON Object, that's the reason why i tried it like above before.

But that doesn't work at all, i even can't compile and get the (IntelliJ) message no instance(s) of type variable(s) exist so that JSONObject conforms to String inference variable T has incompatible bounds: equality constraints: JSONObject upper bounds: Object, String

Addition:

I get 200 as response status so everything worked fine and when i do the same in eg Postman or Fiddler it works.

Answer 1

You can do this by using Jackson: first you create object from body

ObjectMapper mapper = new ObjectMapper();
InputStream responseBody = response.getBody().in();
JSONObject jsonobject = mapper.readValue(responseBody, JSONObject.class);

Then transform jsonobject to string:

String jsonInString = mapper.writeValueAsString(jsonobject);

Answer 2

In this specific case it should also work with

Response response = service.path(path).request(MediaType.APPLICATION_JSON_TYPE).get();

String body = response.readEntity(String.class);

because it tries to read the Entity and construct an object of the given type out of it. So I think that should work.