java - Spring MVC : How to bind to nested object properties in the @ModelAttribute

Question

我要根据以下代码部分进行单元测试:

  @RequestMapping(value = "/changePass", method = RequestMethod.POST)
  public ModelAndView changePass(@ModelAttribute(TAPPLICATION) AppBean applicationBean, BindingResult result, ModelMap model, Principal principal, HttpServletRequest request) throws NSException, SQLException {
         // ...

         if (applicationBean != null
                    && applicationBean.getChangePassDto() != null
                    && StringUtils.isNotEmpty(applicationBean.getChangePassDto().getNewPassword())) {

                String newPassword = applicationBean.getChangePassDto().getNewPassword();
                // ...                   
            }
            // ...

AppBean 包含以下 getter 和 setter:

private ChangePassDto changePassDto;   

   public ChangePassDto getChangePassDto() {
        return changePassDto;
    }

    public void setChangePassDto(ChangePasswordDto changePassDto) {
        this.changePassDto = changePassDto;
    }

基本上，当我执行单元测试时，方法 applicationBean.getChangePassDto() 为 null 但 applicationBean 不为 null。如何初始化 applicationBean.getChangePassDto() 使其不返回 null？我已经使用 .param 方法初始化了其他非对象参数，如我的单元测试中所示。

我还使用 Powermock 作为单元测试框架。

请找到我的单元测试的以下部分:

    @Before
    public void setup() {

        request = new MockHttpServletRequest();
        request.setAttribute(DispatcherServlet.OUTPUT_FLASH_MAP_ATTRIBUTE, new FlashMap());
        response = new MockHttpServletResponse();
        session = new MockHttpSession();
        request.setSession(session);
        RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));

        //Added viewResolver to prevent circular view path error
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix("/WEB-INF/jsp/");
        viewResolver.setSuffix(".jsp");

        this.mockMvc = MockMvcBuilders.standaloneSetup(appController).setViewResolvers(viewResolver).build();    
    }

    @Test
    public void changePass_ExpectC() throws Exception {

        PowerMockito.doNothing().when(passwordVal).validate(any(User.class), anyListOf(Params.class), any(Object.class),any(Errors.class));


        mockMvc.perform(post("/changePass").param("userLogName", "JOHN").param("userLogged", "userLogged").param("password", "password123").param("newPassword", "newPassword123").param("confirmNewPassword", "newPassword123"))
                 .andExpect(view().name(Constants.DENIED))
                .andExpect(status().isOk()
                 );
    }

知道如何初始化 applicationBean.getchangePassDto() 使其不为空吗？

提前感谢您的帮助。

Answer 1

只需在您的 AppBean 中创建 ChangePassDto 的新实例即可:

public class AppBean {

  private ChangePassDto changePassDto = new ChangePassDto();

  public ChangePassDto getChangePassDto() {
    return changePassDto;
  }

  public void setChangePassDto(ChangePasswordDto changePassDto) {
    this.changePassDto = changePassDto;
  }

  // ...
}

然后，您需要使用嵌套 DTO 中属性的完整路径，如下所示:

mockMvc.perform(post("/changePass")
    .param("changePassDto.userLogName", "JOHN")
    .param("changePassDto.userLogged", "userLogged")
    .param("changePassDto.password", "password123")
    .param("changePassDto.newPassword", "newPassword123")
    .param("changePassDto.confirmNewPassword", "newPassword123"))
.andExpect(view().name(Constants.DENIED))
.andExpect(status().isOk());