Junit 测试中 LocalDateTime 反序列化的问题

Question

我LocalDateTime在Junit测试中遇到反序列化问题。我有简单的REST API返回一些DTO对象。当我打电话给我的端点时，响应没有问题 - 这是正确的。然后我尝试编写单元测试，获取MvcResult并使用ObjectMapper将其转换为我的DTO对象。但我仍然收到：

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.time.LocalDateTime` out of START_ARRAY token
 at [Source: (String)"{"name":"Test name","firstDate":[2019,3,11,18,34,43,52217600],"secondDate":[2019,3,11,19,34,43,54219000]}"; line: 1, column: 33] (through reference chain: com.mylocaldatetimeexample.MyDto["firstDate"])

我正在尝试@JsonFormat并添加compile group: 'com.fasterxml.jackson.datatype', name: 'jackson-datatype-jsr310', version: '2.9.8'到我的build.gradle但我使用Spring Boot 2.1.3.RELEASE所以它参与其中。我不知道如何解决它。我的简单端点和单元测试如下：

@RestController
@RequestMapping("/api/myexample")
public class MyController {

    @GetMapping("{id}")
    public ResponseEntity<MyDto> findById(@PathVariable Long id) {

        MyDto myDto = new MyDto("Test name", LocalDateTime.now(), LocalDateTime.now().plusHours(1));
        return ResponseEntity.ok(myDto);
    }
}

MyDto 类

public class MyDto {

    private String name;
    private LocalDateTime firstDate;
    private LocalDateTime secondDate;

// constructors, getters, setters
}

单元测试

public class MyControllerTest {

    @Test
    public void getMethod() throws Exception {
        MyController controller = new MyController();
        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(controller).build();

        MvcResult mvcResult = mockMvc.perform(MockMvcRequestBuilders.get("/api/myexample/1"))
                .andExpect(MockMvcResultMatchers.status().isOk()).andReturn();

        String json = mvcResult.getResponse().getContentAsString();
        MyDto dto = new ObjectMapper().readValue(json, MyDto.class);

        assertEquals("name", dto.getName());
    }
}

Answer 1

您ObjectMapper在测试类中创建新的：

MyDto dto = new ObjectMapper().readValue(json, MyDto.class);

尝试ObjectMapper从Spring上下文注入或手动注册模块：

mapper.registerModule(new JavaTimeModule());

也可以看看：

• 杰克逊模块-java8