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Spring Boot + OpenFeign + Hystrix 服务消费者 ```python

基于Spring Boot和OpenFeign的组合使用案例，展示如何构建服务消费者并实现服务失效处理。

本案例中，服务消费者通过OpenFeign与服务提供者进行通信，并在服务失效时引入Hystrix进行熔断处理。---### 依赖管理```xml
       
            
     
      org.springframework.cloud
             
     
      spring-cloud-starter-netflix-eureka-client
         
        
            
     
      org.springframework.boot
             
     
      spring-boot-starter-web
         
        
            
     
      org.springframework.cloud
             
     
      spring-cloud-starter-openfeign
         
        
            
     
      org.project.lombok
             
     
      lombok
         
        
            
     
      io.github.openfeign
             
     
      feign-httpclient
         
        
            
     
      org.springframework.boot
             
     
      spring-boot-starter-test
             
     
      test
             
                 
                      
       
        org.junit.vintage
                       
       
        junit-vintage-engine
                   
              
         
    
   

OpenFeign 集成 Hystrix ```python

本案例中，OpenFeign与Hystrix集成后，服务消费者在服务失效时可以通过Hystrix进行熔断处理，避免了长时间等待或抛出异常。

配置说明

server:    port: 8110    compression:        enabled: true        mime-types: application/json,application/xml,text/xml,text/html,text/plain        min-response-size: 512spring:    application:        name: service-consumer-hystrix-feigneureka:    client:        service-url:            defaultZone: http://root:123@localhost:8761/eureka/,http://root:123@localhost:8762/eureka/        register-with-eureka: false        registry-fetch-interval-seconds: 10feign:    hystrix:        enabled: true

实体类定义

@Data@NoArgsConstructor@AllArgsConstructorpublic class Order implements Serializable {    private Long id;    private String orderNo;    private String orderAddress;    private BigDecimal totalPrice;    private List
   
     productList;}@Data@NoArgsConstructor@AllArgsConstructorpublic class Product implements Serializable {    private Long id;    private String name;    private Integer num;    private BigDecimal price;}
   

服务接口定义

@FeignClient(value = "service-provider", fallback = ProductServiceFallbackImpl.class)public interface ProductService {    @GetMapping("/provider/getProducts")    List
   
     getProductList();    @GetMapping("/provider/getProductsById/{id}")    Product getProductsById(@PathVariable("id") Long id);    @PostMapping("/provider/getProductsByIdWithPost")    Product selectProductByIdWithPost(Product product);    @PostMapping("/provider/create")    Map
    
      createProduct(Product product);    @GetMapping("/provider/pojo")    Product selectProductByPojo(Product product);}public interface OrderService {    Order getOrderById(Long id);    Order getById(Long id);    Order selectProductByIdWithPost(Product product);    Map
     
       createProduct(Product product);    Product selectProductByPojo(Product product);}
     
    
   

熔断处理实现

public class ProductServiceFallbackImpl implements ProductService {    @Override    public List
   
     getProductList() {        return Arrays.asList(            new Product(1L, "fallback01", 1, new BigDecimal("100")),            new Product(2L, "fallback02", 1, new BigDecimal("100"))        );    }    @Override    public Product getProductsById(Long id) {        return new Product(id, "fallback0" + id, 1, new BigDecimal("100"));    }    @Override    public Product selectProductByIdWithPost(Product product) {        return new Product(product.getId(), "fallback0" + product.getId(), 1, new BigDecimal("100"));    }    @Override    public Map
    
      createProduct(Product product) {        return null;    }    @Override    public Product selectProductByPojo(Product product) {        return null;    }}
    
   

服务实现类

@Servicepublic class OrderServiceImpl implements OrderService {    @Resource    private ProductService productService;    @Override    public Order getOrderById(Long id) {        return new Order(            id,             "order01",             "address",             new BigDecimal("200"),             productService.getProductList()        );    }    @Override    public Order getById(Long id) {        return new Order(            id,             "order01",             "address",             new BigDecimal("200"),             Collections.singletonList(productService.getProductsById(id))        );    }    @Override    public Order selectProductByIdWithPost(Product product) {        return new Order(            product.getId(),             "order01",             "address",             new BigDecimal("200"),             Collections.singletonList(productService.selectProductByIdWithPost(product))        );    }    @Override    public Map
   
     createProduct(Product product) {        return productService.createProduct(product);    }    @Override    public Product selectProductByPojo(Product product) {        return productService.selectProductByPojo(product);    }}
   

启动类注解

@EnableFeignClients

测试结果

通过上述配置和实现，消费者可以直接调用服务提供者的端点，返回的数据如下：

{    "id": 1,    "orderNo": "order01",    "orderAddress": "address",    "totalPrice": 200,    "productList": [        {            "id": 1,            "name": "fallback01",            "num": 1,            "price": 100        },        {            "id": 2,            "name": "fallback02",            "num": 1,            "price": 100        }    ]}

以上是基于Spring Boot和OpenFeign的服务消费者案例，展示了如何实现服务发现、过渡到Hystrix熔断，以及客户端的封装与调用。