@GetMapping("/buy/{id}") public Product order() { Product product = restTemplate.getForObject("http://shop-service product/product/1", Product.class); return product; }
1.1 Feign简介
1.2 基于Feign的服务调用
(1)引入依赖
<!--引入feign依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency>
(2)启动类添加Feign的支持
@SpringBootApplication @EntityScan("cn.itcast.product.order") @EnableFeignClients//通过@EnableFeignClients注解开启Spring Cloud Feign的支持功能 public class OrderApplication { /** * 使用spring的RestTemplate发送http请求到商品服务 * 1.创建RestTemplate对象交给容器管理 * 2.在使用的时候调用其方法完成操作 */ /** * 基于Ribbon的服务调用与负载均衡 */ @LoadBalanced @Bean public RestTemplate restTemplate(){ return new RestTemplate(); } public static void main(String[] args) { SpringApplication.run(OrderApplication.class,args); } }
(3)配置调用微服务的接口
/** * 1.声明需要调用的微服务名称 */ @FeignClient(name = "service-product") public interface ProductFeignClient { /** * 2.配置需要调用的微服务接口 */ @RequestMapping(value = "/product/findById/{id}", method = RequestMethod.GET) public Product findById(@PathVariable("id") Long id);//注意,这里@PathVariable后面一定要配置参数名 }
(4)调用微服务
@Autowired ProductFeignClient productFeignClient; @RequestMapping(value = "/buybuybuybuy/{id}", method = RequestMethod.GET) public Product findById4(@PathVariable Long id) { // Product product = restTemplate.getForObject("http://127.0.0.1:9001/product/findById/1", Product.class); // Product product = restTemplate.getForObject("http://service-product/product/findById/1", Product.class); Product product = productFeignClient.findById(id); return product; }
1.3 Feign和Ribbon的联系
1.4 负载均衡
2 服务调用Feign高级
2.1 Feign的配置
feign: client: config: feignName: ##定义FeginClient的名称 connectTimeout: 5000 # 相当于Request.Options readTimeout: 5000 # 相当于Request.Options # 配置Feign的日志级别,相当于代码配置方式中的Logger loggerLevel: full # Feign的错误解码器,相当于代码配置方式中的ErrorDecoder errorDecoder: com.example.SimpleErrorDecoder # 配置重试,相当于代码配置方式中的Retryer retryer: com.example.SimpleRetryer # 配置拦截器,相当于代码配置方式中的RequestInterceptor requestInterceptors: - com.example.FooRequestInterceptor - com.example.BarRequestInterceptor decode404: false
2.2请求压缩
feign: compression: request: enabled: true # 开启请求压缩 response: enabled: true # 开启响应压缩
feign: compression: request: enabled: true # 开启请求压缩 mime-types: text/html,application/xml,application/json # 设置压缩的数据类型 min-request-size: 2048 # 设置触发压缩的大小下限
2.3 日志级别
feign: client: config: service-product: #这里是被调用的服务名称 loggerLevel: FULL logging: level: cn.itcast.order.fegin.ProductFeginClient: debug
: [ProductFeignClient#findById] <--- HTTP/1.1 200 (822ms) : [ProductFeignClient#findById] content-type: application/json;charset=UTF-8 : [ProductFeignClient#findById] date: Fri, 28 Aug 2020 08:17:12 GMT : [ProductFeignClient#findById] transfer-encoding: chunked : [ProductFeignClient#findById] : [ProductFeignClient#findById] {"id":1,"productName":"访问的服务地址:192.168.137.19011","status":1,"price":111.00,"productDesc":"第一间商铺","caption":"贵族商品","inventory":1111} : [ProductFeignClient#findById] <--- END HTTP (164-byte body) : Flipping property: service-product.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
@PathVariable("id")