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因此,当用户尝试调用我的应用程序未知的 url 时,我试图发送自定义答案。为此,我首先添加到我的application.properties(在主文件夹和测试文件夹中)

spring.mvc.throw-exception-if-no-handler-found=true
spring.web.resources.add-mappings=false

因此,如果没有找到处理程序,则会引发异常。此异常应为NoHandlerFoundException类型

然后我在我的控制器建议中添加了一个自定义异常处理程序我的控制器建议(简化)

@EnableWebMvc // (I tried with and without it doesn't change the error)
@ControllerAdvice
@Order(Ordered.HIGHEST_PRECEDENCE) // (I tried with and without it doesn't change the error)
public class ExceptionsHandler extends ResponseEntityExceptionHandler {
    // invalid route handler
    @Override
    @ResponseStatus(HttpStatus.NOT_FOUND)
    @ResponseBody
    protected ResponseEntity<Object> handleNoHandlerFoundException(
    NoHandlerFoundException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
        String error = "No handler found for " + ex.getHttpMethod() + " " + ex.getRequestURL();

        ApiError apiError = new ApiError(HttpStatus.NOT_FOUND, ex.getLocalizedMessage(), error);
        return new ResponseEntity<>(apiError.getErrors(), new HttpHeaders(), apiError.getStatus());
    }
}

使用它,在我的测试中使用以下方法调用未知 url 时:

this.mvc.perform(get("/ttt"))
        .andDo(print())
        .andExpect(status().isNotFound())
        .andExpect(content().contentType(MediaType.APPLICATION_JSON))
        .andExpect(jsonPath("$.error").value("No Handler found for GET /ttt"));

我进入调试控制台: o.s.web.servlet.PageNotFound : No mapping for GET /ttt 虽然,答案没有我的自定义错误消息,因为我也进入调试控制台:

MockHttpServletResponse:
           Status = 404
    Error message = null
          Headers = []
     Content type = null
             Body = 
    Forwarded URL = null
   Redirected URL = null
          Cookies = []

然后我尝试了

    @ExceptionHandler({NoHandlerFoundException.class})
    @ResponseStatus(HttpStatus.NOT_FOUND)
    @ResponseBody
    public ResponseEntity<Object> handleNoHandler(HttpServletRequest request, Exception ex) {
        String error = ex.getMessage();
        return new ResponseEntity<>(error, new HttpHeaders(), HttpStatus.NOT_FOUND);
    }

但随后出现非法状态异常:Failed to load application context is throwed with cause

IllegalStateException:Ambiguous @ExceptionHandler method mapped for [class org.framework.web.servlet.NoHandlerFoundException]

另外,当我在我的处理程序中放置断点并调试我的测试时,执行永远不会在任何断点处停止。

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1 回答 1

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因此,在使用异常处理程序时,MockMvc 似乎在构建 MockHttpServletRequest 时遇到了麻烦,因此内容为空。当我运行我的 springboot 应用程序并尝试在我的导航器中调用一个未知的 url 时,它可以工作。我有error 404; with body : No handler found使用覆盖方法的预期。

在此处查看更多信息,堆栈接受的答案具有 100+ 有用性得分->单元测试 MockHttpServletRequest 不返回内容类型

于 2022-01-26T16:12:16.767 回答