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                #### 服務調用Feign - 場景舉例 > 項目拆分成訂單服務,庫存服務,積分服務等,現在訂單服務確實知道庫存服務、積分服務、在哪里了,同時也監聽著哪些端口號了。**但是新問題又來了:難道訂單服務要自己寫一大堆代碼,跟其他服務建立網絡連接,然后構造一個復雜的請求,接著發送請求過去,最后對返回的響應結果再寫一大堆代碼來處理嗎?** - 以前的遠程調用方式 ![](https://box.kancloud.cn/02f1f7ec8392a601ab7a8a0fd0d461e1_781x553.png) > 使用Feign可以簡化很多,它底層封裝好了輪子 - 首先引入依賴 ``` <dependency> <groupId>com.dg</groupId> <artifactId>sc-common-lib</artifactId> <version>1.0-SNAPSHOT</version> </dependency> <!-- Eureka客戶端服務注冊 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <!-- 服務調用 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <!-- Web應用支持--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 國際化模板--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> ``` - 定義接口 ProductFeignClient.java ``` @FeignClient(value = "sc-eureka-client") public interface ProductFeignClient { @GetMapping("/products") List<Product> listProducts(); } ``` - 定義Controller進行測試 ``` @Controller public class ProductController { @Autowired ProductFeignClient productFeignClient; @RequestMapping("/products") public Object products(Model m) { List<Product> ps = productFeignClient.listProducts(); m.addAttribute("ps", ps); m.addAttribute("version", 1.0); return "products"; } } ``` - 瀏覽器測試調用結果,結果正確,遠程調用成功 ![](https://box.kancloud.cn/08f7717d519c6f41772ad3382c985ce2_1024x238.png)
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