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。