How do I access the underlying Jackson ObjectMappe

问题:

I need to configure the underlying Jackson ObjectMapper in REST Assured. I am writing REST API tests using REST Assured and I need to define some filters to register with the ObjectMapper that is used to serialize my objects to JSON:

    String newTestSuite = "{\"name\":\"Added through Rest API\",\"description\":\"Test Description\",\"steps\":[]}";

    FilterProvider filters = new SimpleFilterProvider().addFilter("createNewTestSuite", new NewTestSuiteFilter());
    ObjectMapper om = new ObjectMapper();
    om.setFilters(filters);

    try {
        TestSuite ts = om.readValue(newCaspianTest, TestSuite.class);

        RequestSpecification requestSpec = new RequestSpecBuilder()
            .setBaseUri("https://somesite.com")
            .setBody(ts)
            .setUrlEncodingEnabled(false)
            .build();

        ResponseSpecification responseSpec = new ResponseSpecBuilder()
            .expectStatusCode(200)
            .expectStatusLine(Matchers.containsString("200 OK"))
            .build();

        RestAssured.given()
            .auth().basic("testUser","testPassword")
            .spec(requestSpec)
            .log().all()
            .post("/restendpoint")
                .then()
                .log().all()
                .spec(responseSpec);

    } catch(JsonParseException jpe) {

    } catch(JsonMappingException jme) {

    } catch(IOException ioe) {

    }
}

}

回答1:

You can try this:

RestAssured.config = RestAssuredConfig.config().objectMapperConfig(new ObjectMapperConfig().jackson2ObjectMapperFactory(
new Jackson2ObjectMapperFactory() {
        @Override
        public ObjectMapper create(Class aClass, String s) {
            FilterProvider filter = new SimpleFilterProvider().addFilter(...);
            ObjectMapper objectMapper = new ObjectMapper();
            objectMapper.setFilters(filter);
            return objectMapper;
        }
    }
));

回答2:

This will give you an object mapper that does not explode when the back end developer decides to add a new field.

RestAssured.config = RestAssuredConfig.config().objectMapperConfig(new ObjectMapperConfig().jackson2ObjectMapperFactory(
    new Jackson2ObjectMapperFactory() {
      @Override
      public ObjectMapper create(Type cls, String charset) {
        ObjectMapper om = new ObjectMapper().findAndRegisterModules();
        om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        return om;
      }          

    }
));

回答3:

@sanj's answer was very helpful. I had to modify it slightly because I'm using RestAssuredMockMvc.

This is how I configure RestAssuredMockMvc to use snake_case instead of CamelCase:

RestAssuredMockMvc.config = RestAssuredMockMvcConfig.config().objectMapperConfig(new ObjectMapperConfig().jackson2ObjectMapperFactory(
            (type, s) -> {
                ObjectMapper objectMapper = new ObjectMapper();
                objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
                return objectMapper;
            }
    ));