我希望捕捉到我正在开发的spring-boot API中发生的一些杰克逊异常。例如，我具有以下请求类，并且我想捕获当JSON请求对象中的“ questionnaireResponse”键为null或空白（即请求对象中的" "）时发生的错误。
@Validated
@JsonRootName("questionnaireResponse")
public class QuestionnaireResponse {
@JsonProperty("identifier")
@Valid
private Identifier identifier = null;
@JsonProperty("basedOn")
@Valid
private List<Identifier_WRAPPED> basedOn = null;
@JsonProperty("parent")
@Valid
private List<Identifier_WRAPPED> parent = null;
@JsonProperty("questionnaire")
@NotNull(message = "40000")
@Valid
private Identifier_WRAPPED questionnaire = null;
@JsonProperty("status")
@NotNull(message = "40000")
@NotEmptyString(message = "40005")
private String status = null;
@JsonProperty("subject")
@Valid
private Identifier_WRAPPED subject = null;
@JsonProperty("context")
@Valid
private Identifier_WRAPPED context = null;
@JsonProperty("authored")
@NotNull(message = "40000")
@NotEmptyString(message = "40005")
@Pattern(regexp = "\\d{4}-(?:0[1-9]|[1-2]\\d|3[0-1])-(?:0[1-9]|1[0-2])T(?:[0-1]\\d|2[0-3]):[0-5]\\d:[0-5]\\dZ", message = "40001")
private String authored;
@JsonProperty("author")
@NotNull(message = "40000")
@Valid
private QuestionnaireResponseAuthor author = null;
@JsonProperty("source")
@NotNull(message = "40000")
@Valid
private Identifier_WRAPPED source = null; // Reference(Patient | Practitioner | RelatedPerson) resources not implemented
@JsonProperty("item")
@NotNull(message = "40000")
@Valid
private List<QuestionnaireResponseItem> item = null;
public Identifier getIdentifier() {
return identifier;
}
public void setIdentifier(Identifier identifier) {
this.identifier = identifier;
}
public List<Identifier_WRAPPED> getBasedOn() {
return basedOn;
}
public void setBasedOn(List<Identifier_WRAPPED> basedOn) {
this.basedOn = basedOn;
}
public List<Identifier_WRAPPED> getParent() {
return parent;
}
public void setParent(List<Identifier_WRAPPED> parent) {
this.parent = parent;
}
public Identifier_WRAPPED getQuestionnaire() {
return questionnaire;
}
public void setQuestionnaire(Identifier_WRAPPED questionnaire) {
this.questionnaire = questionnaire;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public Identifier_WRAPPED getSubject() {
return subject;
}
public void setSubject(Identifier_WRAPPED subject) {
this.subject = subject;
}
public Identifier_WRAPPED getContext() {
return context;
}
public void setContext(Identifier_WRAPPED context) {
this.context = context;
}
public String getAuthored() {
return authored;
}
public void setAuthored(String authored) {
this.authored = authored;
}
public QuestionnaireResponseAuthor getAuthor() {
return author;
}
public void setAuthor(QuestionnaireResponseAuthor author) {
this.author = author;
}
public Identifier_WRAPPED getSource() {
return source;
}
public void setSource(Identifier_WRAPPED source) {
this.source = source;
}
public List<QuestionnaireResponseItem> getItem() {
return item;
}
public void setItem(List<QuestionnaireResponseItem> item) {
this.item = item;
}
}
导致此Jackson错误：
{
"Map": {
"timestamp": "2018-07-25T12:45:32.285Z",
"status": 400,
"error": "Bad Request",
"message": "JSON parse error: Root name '' does not match expected ('questionnaireResponse') for type [simple type, class com.optum.genomix.model.gel.QuestionnaireResponse]; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Root name '' does not match expected ('questionnaireResponse') for type [simple type, class com.optum.genomix.model.gel.QuestionnaireResponse]\n at [Source: (PushbackInputStream); line: 2, column: 3]",
"path": "/api/optumhealth/genomics/v1.0/questionnaireResponse/create"
}
}
是否有一种方法可以捕获和处理这些异常（在示例中，JsonRootName为null /无效），可能类似于扩展了ResponseEntityExceptionHandler的@ControllerAdvice类？
答案 0 :(得分：0)
是的，您可以实现 HandlerIntercepter 。这样，如果您要提供自定义消息，则可以预先处理请求&&，然后使用 @ControllerAdvice 处理异常。
public class CustomInterceptor implements HandlerInterceptor{
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler){
//your custom logic here.
return true;
}
}
您需要配置此拦截器：
@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {
@Override
public void addInterceptors(InterceptorRegistry registry){
registry.addInterceptor(new CustomInterceptor()).addPathPatterns("/**");
}
}
这是句柄异常：
@Order(Ordered.HIGHEST_PRECEDENCE)
@ControllerAdvice
public class GlobalExceptionHandler {
private static final Logger logger = LogManager.getLogger(GlobalExceptionHandler.class);
@ExceptionHandler(JsonProcessingException.class)
public void handleJsonException(HttpServletResponse response, Exception ex) {
//here build your custom response
prepareErrorResponse(response,UNPROCESSABLE_ENTITY,"");
}
private void prepareErrorResponse(HttpServletResponse response, HttpStatus status, String apiError) {
response.setStatus(status.value());
try(PrintWriter writer = response.getWriter()) {
new ObjectMapper().writeValue(writer, apiError);
} catch (IOException ex) {
logger.error("Error writing string to response body", ex);
}
}
}
答案 1 :(得分：0)
尝试以下方法：
@ControllerAdvice
public class ExceptionConfiguration extends ResponseEntityExceptionHandler {
@ExceptionHandler(JsonMappingException.class) // Or whatever exception type you want to handle
public ResponseEntity<SomeErrorResponsePojo> handleConverterErrors(JsonMappingException exception) { // Or whatever exception type you want to handle
return ResponseEntity.status(...).body(...your response pojo...).build();
}
}
这允许您处理任何类型的异常并做出相应的响应。如果响应状态始终相同，只需在方法上贴上@ResponseStatus(HttpStatus.some_status)并调用ResponseEntity.body(...)
答案 2 :(得分：0)
您可以执行以下操作：
@ExceptionHandler(HttpMessageNotReadableException.class)
public CustomResponse handleJsonException(HttpServletResponse response, HttpMessageNotReadableException ex) {
return customGenericResponse(ex);
}
public CustomResponse customGenericResponse(HttpMessageNotReadableException ex) {
//here build your custom response
CustomResponse customResponse = new CustomResponse();
GenericError error = new GenericError();
error.setMessage(ex.getMessage());
error.setCode(500);
customResponse.setError(error);
return customResponse;
}
CustomResponse为：
public class CustomResponse {
Object data;
GenericError error;
}
public class GenericError {
private Integer code;
private String message;
}
在 customGenericResponse 中，您可以检查 ex 原因的实例，并相应地返回自定义错误消息。
答案 3 :(得分：0)
发现了与此问题类似的问题，只有我是一个不同的JSON解析错误：
JSON parse error: Unrecognized character escape 'w' (code 119); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Unrecognized character escape 'w' (code 119)\n at [Source: (PushbackInputStream); line: 1, column: 10]
来自这样的REST JSON请求
{"query":"\\w"}
如果您可以修改Rest Controller，则可以使用HttpMessageNotReadableException捕获JSON解析错误（在Spring Boot中使用@RestController注释对我有用）。即使我无法使用@ExceptionHandler(Exception.class)
您可以通过使用序列化的对象（自然转换为JSON）来响应自定义JSON。您还可以指定首先要引起问题的请求和异常。这样您可以获得详细信息，或修改错误消息。
@ResponseBody
@ExceptionHandler(HttpMessageNotReadableException.class)
private SerializableResponseObject badJsonRequestHandler(HttpServletRequest req, Exception ex) {
SerializableResponseObject response = new SerializableResponseObject(404,
"Bad Request",
"Invalid request parameters, could not create query",
req.getRequestURL().toString())
Logger logger = LoggerFactory.getLogger(UserController.class);
logger.error("Exception: {}\t{}\t", response);
return response;
}
代码将返回类似
{
"timestamp": "Thu Oct 17 10:19:48 PDT 2019",
"status": 404,
"error": "Bad Request",
"message": "Invalid request parameters, could not create query",
"path": "http://localhost:8080/user/query"
}
并且会记录类似
的内容Exception: [Thu Oct 17 10:19:48 PDT 2019][404][http://localhost:8080/user/query][Bad Request]: Invalid request parameters, could not create query
SerializableResponseObject的代码
public class SerializableResponseObject implements Serializable {
public String timestamp;
public Integer status;
public String error;
public String message;
public String path;
public SerializableResponseObject(Integer status, String error, String message, String path) {
this.timestamp = (new Date()).toString();
this.status = status;
this.error = error;
this.message = message;
this.path = path;
}
public String getTimestamp() {
return timestamp;
}
public Integer getStatus() {
return status;
}
public String getError() {
return error;
}
public String getMessage() {
return message;
}
public String getPath() {
return path;
}
public void setTimestamp(String timestamp) {
this.timestamp = timestamp;
}
public void setStatus(Integer status) {
this.status = status;
}
public void setError(String error) {
this.error = error;
}
public void setMessage(String message) {
this.message = message;
}
public void setPath(String path) {
this.path = path;
}
public String toString() {
return "[" + this.timestamp + "][" + this.status + "][" + this.path + "][" + this.error + "]: " + this.message;
}
}