详解springcloud 基于feign的服务接口的统一hystrix降级处理

@FeignClient(name="springcloud-nacos-producer", qualifier="productApiService", contextId="productApiService", fallback=ProductFallbackApiService.class)public interface ProductApiService { /**  * 创建商品  * @param product  */ @PostMapping(value="/api/product/add", produces=APPLICATION_JSON, consumes=APPLICATION_JSON) public Result<Long> createProduct(@RequestBody Product product);  /**  * 修改商品  * @param product  */ @PutMapping(value="/api/product/update", produces=APPLICATION_JSON, consumes=APPLICATION_JSON) public Result<Object> updateProduct(@RequestBody Product product);  /**  * 删除商品  * @param productId  */ @DeleteMapping(value="/api/product/delete/{productId}", produces=APPLICATION_JSON) public Result<Object> deleteProductById(@PathVariable("productId") Long productId);  /**  * 根据productId获取商品信息  * @param productId  * @return  */ @GetMapping(value="/api/product/{productId}", produces=APPLICATION_JSON) public Result<Product> getProductById(@PathVariable("productId") Long productId);  /**  * 根据条件查询商品列表(分页、排序)  * @param condition  * @param page  * @param sort  * @return  */ @GetMapping(value="/api/product/list1", produces=APPLICATION_JSON) public PageResult<List<Product>> getProductListByPage(@RequestParam Product condition, @RequestParam Page page, @RequestParam Sort sort);}

@Componentpublic class ProductFallbackApiService implements ProductApiService { private static final HttpStatus SERVICE_UNAVAILABLE = HttpStatus.SERVICE_UNAVAILABLE;  protected <T> Result<T> defaultFallbackResult() {  return Result.failure().code(String.valueOf(SERVICE_UNAVAILABLE.value())).message(String.format("请求失败：%s, %s", SERVICE_UNAVAILABLE.value(), SERVICE_UNAVAILABLE.getReasonPhrase())).build(); }  protected <T> PageResult<T> defaultFallbackPageResult() {  return PageResult.failure().code(String.valueOf(SERVICE_UNAVAILABLE.value())).message(String.format("请求失败：%s, %s", SERVICE_UNAVAILABLE.value(), SERVICE_UNAVAILABLE.getReasonPhrase())).build(); }  @Override public Result<Long> createProduct(Product product) {  return defaultFallbackResult(); } @Override public Result<Object> updateProduct(Product product) {  return defaultFallbackResult(); } @Override public Result<Object> deleteProductById(Long productId) {  return defaultFallbackResult(); } @Override public Result<Product> getProductById(Long productId) {  return defaultFallbackResult(); } @Override public PageResult<List<Product>> getProductListByPage(Product condition, Page page, Sort sort) {  return defaultFallbackPageResult(); }}