测试中未使用的自定义ObjectMapper

我调查了一下为什么这样做会如此。重申一下，让我的自定义ObjectMapper在我的测试中工作的过程（假定MockMvc是作为独立的创建的）如下：

1. 创建一个

   WebConfig

   扩展类

   WebMvcConfigurerAdapter

   。
2. 在

   WebConfig

   该类中，创建一个

   @Bean

   返回的新值

   MappingJackson2HttpMessageConverter

   。这

   MappingJackson2HttpMessageConverter

   已应用了所需的更改（在我的情况下，将其传递给

   Jackson2ObjectMapperBuilder

   ，且

   PropertyNamingStrategy

   设置为

   CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES

   。）
3. 同样在

   WebConfig

   该类中，

   @Override

   configureMessageConverters()

   并将

   MappingJackson2HttpMessageConverter

   from（2）添加到消息转换器列表中。
4. 在测试文件中，添加

   @ContextConfiguration(classes = { WebConfig.class })

   注释以通知您的测试

   @Bean

   。
5. 使用

   @Autowired

   注入和访问的

   @Bean

   （2）中所定义。
6. 在的设置中

   MockMvc

   ，使用

   .setMessageConverters()

   方法并将其传递给注入

   MappingJackson2HttpMessageConverter

   。现在，测试将使用（2）中设置的配置。

测试文件：

package com.myproject.controller;import org.junit.Before;import org.junit.Test;import org.junit.runner.RunWith;import org.mockito.InjectMocks;import org.mockito.Mock;import org.mockito.MockitoAnnotations;import org.springframework.http.MediaType;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import org.springframework.test.context.web.AnnotationConfigWebContextLoader;import org.springframework.test.context.web.WebAppConfiguration;import org.springframework.test.web.servlet.MockMvc;import org.springframework.test.web.servlet.MvcResult;import org.springframework.test.web.servlet.setup.MockMvcBuilders;import static org.mockito.Mockito.when;import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;// Along with other application imports...@RunWith(SpringJUnit4ClassRunner.class)@WebAppConfiguration@ContextConfiguration(classes = {WebConfig.class})public class MyControllerTest {        @Autowired    private MappingJackson2HttpMessageConverter jackson2HttpMessageConverter;    @Mock    private MyManager myManager;    @InjectMocks    private MyController myController;    private MockMvc mockMvc;    @Before    public void setup() {        MockitoAnnotations.initMocks(this);        this.mockMvc = MockMvcBuilders .standaloneSetup(this.myController) .setMessageConverters(this.jackson2HttpMessageConverter) // important! .build();    }    @Test    public void testMyControllerWithNameParam() throws Exception {        MyEntity expected = new MyEntity();        String name = "expected";        String title = "expected title";        // Set up MyEntity with data.        expected.setId(1); // Random ID.        expected.setEntityName(name);        expected.setEntityTitle(title)        // When the MyManager instance is asked for the MyEntity with name parameter,        // return expected.        when(this.myManager.read(name)).thenReturn(expected);        // Assert the proper results.        MvcResult result = mockMvc.perform(     get("/v1/endpoint")         .param("name", name))     .andExpect(status().isOk())     .andExpect((content().contentType("application/json;charset=UTF-8")))     .andExpect(jsonPath("$.entity_name", is(name))))     .andExpect(jsonPath("$.entity_title", is(title)))     .andReturn();        System.out.println(result.getResponse().getContentAsString());    }}

和配置文件：

package com.myproject.config;import com.fasterxml.jackson.databind.PropertyNamingStrategy;import org.springframework.context.annotation.*;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import java.util.List;@Configuration@EnableWebMvcpublic class WebConfig extends WebMvcConfigurerAdapter {    @Override    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {        converters.add(jackson2HttpMessageConverter());    }    @Bean    public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter() {        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();        Jackson2ObjectMapperBuilder builder = this.jacksonBuilder();        converter.setObjectMapper(builder.build());        return converter;    }    public Jackson2ObjectMapperBuilder jacksonBuilder() {        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();         builder.propertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES);        return builder;    }}

将我生成的WAR文件部署到XAMPP中的Tomcat
7表示正确使用了命名策略。我认为这样做是可行的，因为在独立安装中，除非另有说明，否则始终使用默认的消息转换器集。可以

setMessageConverters()

orgspringframeworktestwebservletsetupStandaloneMockMvcBuilder.java

       public StandaloneMockMvcBuilder setMessageConverters(HttpMessageConverter<?>...messageConverters) {        this.messageConverters = Arrays.asList(messageConverters);        return this;    }

因此，如果在构建MockMvc的过程中未明确告知MockMvc有关消息转换器的更改，它将不会使用这些更改。