jersey 2.21。
我有一个如下所示的资源文件
……
@POST
@Path("/userReg")
@Produces("application/json;charset=UTF-8")
public JsonResp userReg(UserRegReq userRegReq) throws LoginNameExists {
HttpHeaderUtils.parseHeaders(userRegReq, headers);
//JsonResp is a custom java class.
JsonResp result = new JsonResp();
//will throw LoginNameExists
User user = userManager.register(userRegReq.getLoginName(), userRegReq.getPassword());
//success
result.setResult(0);
result.setData(user.getId);
return result;
}
……
要将结果返回给客户端,我实现了一个自定义MessageBodyWriter,如下所示
@Produces("application/json")
public class MyRespWriter implements MessageBodyWriter<JsonResp> {
@Override
public boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
return type == JsonResp.class;
}
@Override
public long getSize(JsonResp jsonResp, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
return 0;
}
@Override
public void writeTo(JsonResp jsonResp, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> multivaluedMap, OutputStream outputStream) throws IOException, WebApplicationException {
//if these no exception in userReg(),
//the parameter annotations contains the annotations
//such as POST, Path, Produces;
//but if there is an exception in userReg(),
//the parameter annotations contains none of POST, Path, Produces;
//So, is there any way to retrieve the original annotations all along?
//JsonUtils is a custom java class.
String data = JsonUtils.toJsonString(jsonResp);
Writer osWriter = new OutputStreamWriter(outputStream, "UTF-8");
osWriter.write(data);
osWriter.flush();
}
}
为了处理异常,我实现了这样的ExceptionMapper:
public class MyExceptionMapper implements ExceptionMapper<Exception> {
public Response toResponse(Exception e) {
JsonResp result = new JsonResp();
//error
result.setResult(-1);
result.setErrMsg("System error.");
return Response.ok(result, MediaType.APPLICATION_JSON_TYPE).status(Response.Status.OK).build();
}
}
现在,如果一切正常并且没有异常,代码执行路由器为userReg() -> MyRespWriter.writeTo()
,MyRespWriter.writeTo()
的参数“注释”包含方法userReg()
的正确注释,例如POST
,Path
,Produces
。
但如果userReg()
抛出异常,代码执行路由器为userReg() -> MyExceptionMapper.toResponse() -> MyRespWriter.writeTo()
,则方法MyRespWriter.writeTo()
的参数“注释”没有方法userReg()
的注释。 / p>
我想知道,MyRespWriter.writeTo()
是否可以一直检索原始注释?
答案 0 :(得分:1)
您可以注入ResourceInfo
,然后使用Method
获取ri.getResourceMethod()
,然后拨打method.getAnnotations()
以获取注释。
public class MyRespWriter implements MessageBodyWriter<JsonResp> {
@Context
ResourceInfo ri;
...
Annotations[] annos = ri.getResourceMethod().getAnnotations();