java - 如何使用 Micronaut 客户端注释映射 errorType

Question

如何使用 Micronaut 客户端注释映射 errorType，如果以编程方式，我们可以在成功和失败时提供主体类型和 errorType 对象。

以编程方式调用客户端:

import io.micronaut.core.type.Argument;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.HttpResponse;
import io.micronaut.http.MediaType;
import io.micronaut.http.client.DefaultHttpClient;
import io.micronaut.http.client.exceptions.HttpClientResponseException;
import io.micronaut.http.uri.UriBuilder;
import io.reactivex.Single;
import java.net.URL;

@Singleton
public class Test{
    public User getUser(String id) {
        try {
            String uriPath = UriBuilder.of("url")
                            .queryParam("id", id)
                            .toString();

        DefaultHttpClient httpClient = new DefaultHttpClient(new URL(""),httpClientConfiguration);

        Single<HttpResponse<User>> single = Single.fromPublisher(httpClient.exchange(
        HttpRequest.GET(uriPath).header(X_REQUEST_ID, REQUEST_ID).accept(MediaType.APPLICATION_JSON_TYPE),
        Argument.of(User.class), //bodyType
        Argument.of(Object.class) //errorType
        ));

        HttpResponse<User> response = single.blockingGet();
        User user = response.body();
        return user;            
        } catch (HttpClientResponseException | Exception e ) {              
        } 
    }
}

使用注解调用Client

import io.micronaut.http.HttpResponse;
import io.micronaut.http.MediaType;
import io.micronaut.http.annotation.Consumes;
import io.micronaut.http.annotation.Get;
import io.micronaut.http.annotation.Header;
import io.micronaut.http.client.annotation.Client;
import io.reactivex.Single;
@Client(value = "url",
path = "/user")
public interface TestClient {
    @Get("?id=123")
    @Consumes(MediaType.APPLICATION_JSON)
        Single<HttpResponse<User>> getUser();
   }

Answer 1

如果你想定义自己的自定义对象为errorType，可以在micronaut中使用声明式客户端时声明如下:

@Client(id="",//The ID of the client
            value = "url", //The URL or service ID of the remote service
            path = "/user",//The base URI for the client. Only to be used in conjunction with id().
            errorType=YourCustomObject.class,//The type used to decode errors
            configuration=<? extends HttpClientConfiguration>//The http client configuration bean to use
            )
public interface ExternalCallClient{
    //some API method
}

然后在您的连接器客户端类:

class Connect{

@Inject
private ExternalCallClient externalCallClient;

call(){

    try{
        //call to external API method using externalCallClient
      }catch(HttpClientResponseException e){

         Optional<YourCustomObject> error = e.getResponse()
                                             .getBody(YourCustomObject.class)
            }
        }
    }

如果底层客户端出现异常，Micronaut 客户端会对 HTTP 代码(400 及以上 400(404 除外))抛出 HttpClientResponseException。因此，如果底层客户端在出现异常时提供自定义错误对象作为响应正文，则此自定义错误类型可用于优雅的错误处理和日志记录。

类似的方法也可用于 DefaultHttpClient。