CODEWITHSUNDEEP
jsonjakarta-eeresteasy
KIC
KIC

Reputation: 6121

Wildfly RestEASY return json from plain string

I have and angular app and I want to make a small session store for the case when a user has to login but should be able to resume where he left the page.

The Storing part is pretty easy since I store the received jsonstring as it is. But when I retun the value the String got escaped to be a string instead of a json. Is there a way to return a string (which is already json) as json object?

@Path("/session")
public class SessionStore extends Application {
    @POST
    @Path("/save/{variable}")
    @Consumes("application/json")
    public boolean save(@PathParam("variable") String var, String json) throws Exception {
        getSession().setAttribute(var, json);
        return true;
    }

    @GET
    @Path("/load/{variable}")
    @Produces("application/json")
    public Object load(@PathParam("variable") String var) {
        return getSession().getAttribute(var); // this string is already a json
    }
}

Upvotes: 0

Views: 2967

Answers (2)

lefloh
lefloh

Reputation: 10961

I don't know which JSON serializer you are using. I could not reproduce this behavior with Jackson.

At first I would change the return time of your method to String. As it does not make sense to convert a String to a JSON-String unless it is already a JSON-String your JSON serializer should not touch it. If it tries to be smarter you can register a custom MessageBodyWriter for Strings:

@Provider
@Produces(MediaType.APPLICATION_JSON)
public class JsonStringSerializer implements MessageBodyWriter<String> {

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type == String.class;
    }

    @Override
    public long getSize(String t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    @Override
    public void writeTo(String entity, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
        entityStream.write(entity.getBytes(Charset.forName("UTF-8")));      
    }

}

I'd strongly recommend not to change the @Produces annotation to text/plain. This may result in returning the correct content but will also change the Content-Type header to text/plain. So you are sending JSON but telling your client that it is no JSON. If the client believes you he will not parse the content any more.

Upvotes: 0

Zhedar
Zhedar

Reputation: 3510

If you dont't want your return value to be automatically boxed into the json format, tell your JAX-RS implementation to return plain text instead of json with @Produces("text/plain").

@GET
@Path("/load/{variable}")
@Produces("text/plain")
public String load(@PathParam("variable") String var) {
    //the cast may not be necessary, but this way your intention is clearer
    return (String) getSession().getAttribute(var);
}

Upvotes: 1

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