Spring Boot 的 HTTP 客户端框架

<dependency>
    <groupId>com.github.lianjiatech</groupId>
    <artifactId>retrofit-spring-boot-starter</artifactId>
    <version>2.2.2</version>
</dependency>

@RetrofitClient(baseUrl = "${test.baseUrl}")
public interface HttpApi {
    @GET("person")
    Result<Person> getPerson(@Query("id") Long id);
}

@Service
public class TestService {
    @Autowired
    private HttpApi httpApi;
    public void test() {
        // 通过httpApi发起http请求
    }
}

retrofit:
  enable-response-call-adapter: true
  # 启用日志打印
  enable-log: true
  # 连接池配置
  pool:
    test1:
      max-idle-connections: 3
      keep-alive-second: 100
    test2:
      max-idle-connections: 5
      keep-alive-second: 50
  # 禁用void返回值类型
  disable-void-return-type: false
  # 日志打印拦截器
  logging-interceptor: com.github.lianjiatech.retrofit.spring.boot.interceptor.DefaultLoggingInterceptor
  # 请求重试拦截器
  retry-interceptor: com.github.lianjiatech.retrofit.spring.boot.retry.DefaultRetryInterceptor
  # 全局转换器工厂
  global-converter-factories:
    - retrofit2.converter.jackson.JacksonConverterFactory
  # 全局调用适配器工厂
  global-call-adapter-factories:
    - com.github.lianjiatech.retrofit.spring.boot.core.BodyCallAdapterFactory
    - com.github.lianjiatech.retrofit.spring.boot.core.ResponseCallAdapterFactory
  # 是否启用熔断降级
  enable-degrade: true
  # 熔断降级实现方式
  degrade-type: sentinel
  # 熔断资源名称解析器
  resource-name-parser: com.github.lianjiatech.retrofit.spring.boot.degrade.DefaultResourceNameParser

@RetrofitClient(baseUrl = "http://ke.com")
public interface HttpApi3 {
    @OkHttpClientBuilder
    static OkHttpClient.Builder okhttpClientBuilder() {
        return new OkHttpClient.Builder()
                .connectTimeout(1, TimeUnit.SECONDS)
                .readTimeout(1, TimeUnit.SECONDS)
                .writeTimeout(1, TimeUnit.SECONDS);
    }
    @GET
    Result<Person> getPerson(@Url String url, @Query("id") Long id);
}

@Component
public class TimeStampInterceptor extends BasePathMatchInterceptor {
    @Override
    public Response doIntercept(Chain chain) throws IOException {
        Request request = chain.request();
        HttpUrl url = request.url();
        long timestamp = System.currentTimeMillis();
        HttpUrl newUrl = url.newBuilder()
                .addQueryParameter("timestamp", String.valueOf(timestamp))
                .build();
        Request newRequest = request.newBuilder()
                .url(newUrl)
                .build();
        return chain.proceed(newRequest);
    }
}

@RetrofitClient(baseUrl = "${test.baseUrl}")
@Intercept(handler = TimeStampInterceptor.class, include = {"/api/**"}, exclude = "/api/test/savePerson")
public interface HttpApi {
    @GET("person")
    Result<Person> getPerson(@Query("id") Long id);
    @POST("savePerson")
    Result<Person> savePerson(@Body Person person);
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
@InterceptMark
public @interface Sign {
    /**
     * 密钥key
     * 支持占位符形式配置。
     *
     * @return
     */
    String accessKeyId();
    /**
     * 密钥
     * 支持占位符形式配置。
     *
     * @return
     */
    String accessKeySecret();
    /**
     * 拦截器匹配路径
     *
     * @return
     */
    String[] include() default {"/**"};
    /**
     * 拦截器排除匹配，排除指定路径拦截
     *
     * @return
     */
    String[] exclude() default {};
    /**
     * 处理该注解的拦截器类
     * 优先从spring容器获取对应的Bean，如果获取不到，则使用反射创建一个！
     *
     * @return
     */
    Class<? extends BasePathMatchInterceptor> handler() default SignInterceptor.class;
}

@Component
public class SignInterceptor extends BasePathMatchInterceptor {
    private String accessKeyId;
    private String accessKeySecret;
    public void setAccessKeyId(String accessKeyId) {
        this.accessKeyId = accessKeyId;
    }
    public void setAccessKeySecret(String accessKeySecret) {
        this.accessKeySecret = accessKeySecret;
    }
    @Override
    public Response doIntercept(Chain chain) throws IOException {
        Request request = chain.request();
        Request newReq = request.newBuilder()
                .addHeader("accessKeyId", accessKeyId)
                .addHeader("accessKeySecret", accessKeySecret)
                .build();
        return chain.proceed(newReq);
    }
}

@RetrofitClient(baseUrl = "${test.baseUrl}")
@Sign(accessKeyId = "${test.accessKeyId}", accessKeySecret = "${test.accessKeySecret}", exclude = {"/api/test/person"})
public interface HttpApi {
    @GET("person")
    Result<Person> getPerson(@Query("id") Long id);
    @POST("savePerson")
    Result<Person> savePerson(@Body Person person);
}

retrofit:
   # 连接池配置
   pool:
       test1:
       max-idle-connections: 3
       keep-alive-second: 100
       test2:
       max-idle-connections: 5
        keep-alive-second: 50

@RetrofitClient(baseUrl = "${test.baseUrl}", poolName="test1")
public interface HttpApi {
    @GET("person")
    Result<Person> getPerson(@Query("id") Long id);
}

retrofit:
  # 日志打印拦截器
  logging-interceptor: com.github.lianjiatech.retrofit.spring.boot.interceptor.DefaultLoggingInterceptor

retrofit:
  # 请求重试拦截器
  retry-interceptor: com.github.lianjiatech.retrofit.spring.boot.retry.DefaultRetryInterceptor

/**
 * 错误解码器。ErrorDecoder.
 * 当请求发生异常或者收到无效响应结果的时候，将HTTP相关信息解码到异常中，无效响应由业务自己判断
 *
 * When an exception occurs in the request or an invalid response result is received, the HTTP related information is decoded into the exception,
 * and the invalid response is determined by the business itself.
 *
 * @author 陈添明
 */
public interface ErrorDecoder {
    /**
     * 当无效响应的时候，将HTTP信息解码到异常中，无效响应由业务自行判断。
     * When the response is invalid, decode the HTTP information into the exception, invalid response is determined by business.
     *
     * @param request  request
     * @param response response
     * @return If it returns null, the processing is ignored and the processing continues with the original response.
     */
    default RuntimeException invalidRespDecode(Request request, Response response) {
        if (!response.isSuccessful()) {
            throw RetrofitException.errorStatus(request, response);
        }
        return null;
    }
    /**
     * 当请求发生IO异常时，将HTTP信息解码到异常中。
     * When an IO exception occurs in the request, the HTTP information is decoded into the exception.
     *
     * @param request request
     * @param cause   IOException
     * @return RuntimeException
     */
    default RuntimeException ioExceptionDecode(Request request, IOException cause) {
        return RetrofitException.errorExecuting(request, cause);
    }
    /**
     * 当请求发生除IO异常之外的其它异常时，将HTTP信息解码到异常中。
     * When the request has an exception other than the IO exception, the HTTP information is decoded into the exception.
     *
     * @param request request
     * @param cause   Exception
     * @return RuntimeException
     */
    default RuntimeException exceptionDecode(Request request, Exception cause) {
        return RetrofitException.errorUnknown(request, cause);
    }
}

@Component
public class SourceInterceptor extends BaseGlobalInterceptor {
    @Override
    public Response doIntercept(Chain chain) throws IOException {
        Request request = chain.request();
        Request newReq = request.newBuilder()
                .addHeader("source", "test")
                .build();
        return chain.proceed(newReq);
    }
}

retrofit:
  # 是否启用熔断降级
  enable-degrade: true
  # 熔断降级实现方式(目前仅支持Sentinel)
  degrade-type: sentinel
  # 资源名称解析器
  resource-name-parser: com.github.lianjiatech.retrofit.spring.boot.degrade.DefaultResourceNameParser

<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-core</artifactId>
    <version>1.6.3</version>
</dependency>

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
@Documented
public @interface Degrade {
    /**
     * RT threshold or exception ratio threshold count.
     */
    double count();
    /**
     * Degrade recover timeout (in seconds) when degradation occurs.
     */
    int timeWindow() default 5;
    /**
     * Degrade strategy (0: average RT, 1: exception ratio).
     */
    DegradeStrategy degradeStrategy() default DegradeStrategy.AVERAGE_RT;
}

@Slf4j
@Service
public class HttpDegradeFallback implements HttpDegradeApi {
    @Override
    public Result<Integer> test() {
        Result<Integer> fallback = new Result<>();
        fallback.setCode(100)
                .setMsg("fallback")
                .setBody(1000000);
        return fallback;
    }
}
@Slf4j
@Service
public class HttpDegradeFallbackFactory implements FallbackFactory<HttpDegradeApi> {
    /**
     * Returns an instance of the fallback appropriate for the given cause
     *
     * @param cause fallback cause
     * @return 实现了retrofit接口的实例。an instance that implements the retrofit interface.
     */
    @Override
    public HttpDegradeApi create(Throwable cause) {
        log.error("触发熔断了! ", cause.getMessage(), cause);
        return new HttpDegradeApi() {
            @Override
            public Result<Integer> test() {
                Result<Integer> fallback = new Result<>();
                fallback.setCode(100)
                        .setMsg("fallback")
                        .setBody(1000000);
                return fallback;
            }
    }
}

@Bean
@Autowired
public ServiceInstanceChooser serviceInstanceChooser(LoadBalancerClient loadBalancerClient) {
    return new SpringCloudServiceInstanceChooser(loadBalancerClient);
}

@RetrofitClient(serviceId = "${jy-helicarrier-api.serviceId}", path = "/m/count", errorDecoder = HelicarrierErrorDecoder.class)
@Retry
public interface ApiCountService {
}

 ResponseCallAdapterFactory

    /**
     * Call<T>
     * 不执行适配处理，直接返回Call<T>对象
     * @param id
     * @return
     */
    @GET("person")
    Call<Result<Person>> getPersonCall(@Query("id") Long id);
    /**
     *  CompletableFuture<T>
     *  将响应体内容适配成CompletableFuture<T>对象返回
     * @param id
     * @return
     */
    @GET("person")
    CompletableFuture<Result<Person>> getPersonCompletableFuture(@Query("id") Long id);
    /**
     * Void
     * 不关注返回类型可以使用Void。如果http状态码不是2xx，直接抛错！
     * @param id
     * @return
     */
    @GET("person")
    Void getPersonVoid(@Query("id") Long id);
    /**
     *  Response<T>
     *  将响应内容适配成Response<T>对象返回
     * @param id
     * @return
     */
    @GET("person")
    Response<Result<Person>> getPersonResponse(@Query("id") Long id);
    /**
     * 其他任意Java类型
     * 将响应体内容适配成一个对应的Java类型对象返回，如果http状态码不是2xx，直接抛错！
     * @param id
     * @return
     */
    @GET("person")
    Result<Person> getPerson(@Query("id") Long id);

retrofit:
  # 全局调用适配器工厂
  global-call-adapter-factories:
    - com.github.lianjiatech.retrofit.spring.boot.core.BodyCallAdapterFactory
    - com.github.lianjiatech.retrofit.spring.boot.core.ResponseCallAdapterFactory

retrofit:
  # 全局转换器工厂
  global-converter-factories:
    - retrofit2.converter.jackson.JacksonConverterFactory