轻量级声明式的Http库——Feign的独立使用

      <dependency>
            <groupId>com.netflix.feign</groupId>
            <artifactId>feign-core</artifactId>
            <version>8.18.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.netflix.feign/feign-gson -->
        <dependency>
            <groupId>com.netflix.feign</groupId>
            <artifactId>feign-gson</artifactId>
            <version>8.18.0</version>
        </dependency>

public interface OuterService {
    
    @RequestLine("GET /requesr/list?name={name}")
    @Headers("Authorization: Basic  {token}")
    String request(@Param(value = "name") String name，@Param(value = "token") String token);
}

OuterService service = Feign.builder()
            .options(new Options(1000, 3500))
            .retryer(new Retryer.Default(5000, 5000, 3))
            .target(OuterService.class, http://127.0.0.1:8085);

service.request("test","ad12hj3bhj1b23hj1b2");

@Headers({"Content-Type: application/json","Accept: application/json"})

## 指定Gson序列化。也可以使用Jackson序列化（引入其依赖）
OuterService service = Feign.builder()
                .encoder(new GsonEncoder())
                .decoder(new GsonDecoder())
                .options(new Options(1000, 3500))
                .retryer(new Retryer.Default(5000, 5000, 3))
                .target(OuterService.class, http://127.0.0.1:8085);

OuterService service = Feign.builder()
                .encoder(new GsonEncoder())
                .decoder(new GsonDecoder())
                .requestInterceptor(template -> {
                    // template 可以获取/修改body，header等信息
                })
                .options(new Options(1000, 3500))
                .retryer(new Retryer.Default(5000, 5000, 3))
                .target(OuterService.class, http://127.0.0.1:8085);

    ## get请求
    @RequestLine("GET /messages/detail?msg_ids={msgIds}")
    ## post请求
    @RequestLine("POST /messages/detail?msg_ids={msgIds}")