java 如何仅在特定方法中使用 RESTEasy PreProcessInterceptor？
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How to use RESTEasy PreProcessInterceptor only in specific methods?
提问by pulu
I'm writing a REST API, making use of RestEasy 2.3.4.Final. I know that a Interceptor will intercept all of my requests, and that a PreProcessInterceptor will be the first (before everything) to be called. I would like to know how can I make this Interceptor to be called just when specific methods are called.
我正在编写一个 REST API，使用 RestEasy 2.3.4.Final。我知道拦截器将拦截我的所有请求，并且 PreProcessInterceptor 将是第一个（在一切之前）被调用。我想知道如何让这个拦截器在调用特定方法时被调用。
I tried to use both PreProcessInterceptor and AcceptedByMethod, but I was not able to read the parameters I need. For example, I need to run my Interceptor only when this method is called:
我尝试同时使用 PreProcessInterceptor 和 AcceptedByMethod，但无法读取所需的参数。例如，我只需要在调用此方法时运行我的拦截器：
@GET
@Produces("application/json;charset=UTF8")
@Interceptors(MyInterceptor.class)
public List<City> listByName(@QueryParam("name") String name) {...}
To be more specific, I need to run my Interceptor in all methods whose have a @QueryParam("name")
更具体地说，我需要在所有具有 @QueryParam("name")
on its signature, so that I can grab the name and do something before everything.
在它的签名上，这样我就可以抓住名字并在一切之前做一些事情。
Is it possible? I tried to catch the "name" parameter inside the Interceptor, but I was not able to do that.
是否可以？我试图在拦截器中捕获“名称”参数，但我无法做到。
Could someone help me, please?
有人可以帮我吗？
采纳答案by eiden
You can use AcceptedByMethodas explained in the RESTEasy documentation
您可以AcceptedByMethod按照RESTEasy 文档中的说明使用
Create a class that implement both PreProcessInterceptorand AcceptedByMethod. In the accept-method, you can check if the method has a parameter with annotated with @QueryParam("name"). If the method has that annotation, return true from the accept-method.
创建一个同时实现PreProcessInterceptor和的类AcceptedByMethod。在accept-method 中，您可以检查该方法是否有带注释的参数@QueryParam("name")。如果该方法具有该注释，则从accept-method返回 true 。
In the preProcess-method, you can get the query parameter from request.getUri().getQueryParameters().getFirst("name").
在preProcess- 方法中，您可以从request.getUri().getQueryParameters().getFirst("name").
EDIT:
编辑：
Here is an example:
下面是一个例子：
public class InterceptorTest {
@Path("/")
public static class MyService {
@GET
public String listByName(@QueryParam("name") String name){
return "not-intercepted-" + name;
}
}
public static class MyInterceptor implements PreProcessInterceptor, AcceptedByMethod {
@Override
public boolean accept(Class declaring, Method method) {
for (Annotation[] annotations : method.getParameterAnnotations()) {
for (Annotation annotation : annotations) {
if(annotation.annotationType() == QueryParam.class){
QueryParam queryParam = (QueryParam) annotation;
return queryParam.value().equals("name");
}
}
}
return false;
}
@Override
public ServerResponse preProcess(HttpRequest request, ResourceMethod method)
throws Failure, WebApplicationException {
String responseText = "intercepted-" + request.getUri().getQueryParameters().getFirst("name");
return new ServerResponse(responseText, 200, new Headers<Object>());
}
}
@Test
public void test() throws Exception {
Dispatcher dispatcher = MockDispatcherFactory.createDispatcher();
dispatcher.getProviderFactory().getServerPreProcessInterceptorRegistry().register(new MyInterceptor());
dispatcher.getRegistry().addSingletonResource(new MyService());
MockHttpRequest request = MockHttpRequest.get("/?name=xxx");
MockHttpResponse response = new MockHttpResponse();
dispatcher.invoke(request, response);
assertEquals("intercepted-xxx", response.getContentAsString());
}
}
回答by maiello
if you return return new ServerResponse(responseText, 200, new Headers<Object>());you will lose the end-point. you need to return nullif you still want the message to be delivered to the final point.
如果您返回，return new ServerResponse(responseText, 200, new Headers<Object>());您将失去终点。null如果您仍然希望将消息传递到最后一点，则需要返回。
