动态feign调用

1.上下文类

@Component("springContextS")
public class SpringContextS implements ApplicationContextAware{

    private static ApplicationContext applicationContext;

    public void setApplicationContext(ApplicationContext applicationContext) throw BeansException {
        SpringContextS.applicationContext = applicationContext;    }

    public static ApplicationContext getApplicationContext(){
       return applicationContext;
    }
}

2.Feign工具类

public class FeignClientUtils {
    private static final Map<String,Object> FEIGN_CACHE = new ConcurrentHashMap();
    private static <T> T build(String type,String server,Class<T> clazz){
         String key = String.format("%s-%s",type,server);
         T t = (T) FEIGN_CACHE.get(key);
         if(Objects.isNull(t)){
            FeignClientBuilder.Builder<T> builder = new FeignClientBuilder(SpringContextS.getApplicationContext()).forType(clazz,server):
            builder = builder.contextId(UUID.randomUUID().toString());
            t = builder.build();
            FEIGN_CACHE.put(key,t);
         }
         return t;
    }
}

3.Feign接口模板

public interface FeignClientTemplate {
   @PostMapping("/TEMPLATE/list")
   Result<List<ResDTO>> list(@RequestBody ReqDTO dto); 
}

4.Feign拦截器

@Configuration
public class TempFeignInterceptor implements RequestInterceptor{
    @Override
    public void apply(RequestTemplate template){
        String server = template.feignTarget().name.toLowerCase();
        String url = "/" + server+"/test"
        String tempUrl = template.url();
        if(StringUtils.isNotEmpty(templateUrl){
            if(tempUrl.contains("TEMPLATE")){
               template.uri(tempUrl.replace("TEMPLATE",url);
            }
        }
    }
}

5.使用

public void use(ReqDTO dto){
    FeignClientTemplate client = FeignClientUtils.build("TEXT","TEXT",FeignClientTemplate.class);
   Result< List> result =  client.list(dto);
}