nacos服务之间相互调用

服务之间相互调用

比如，订单服务需要调用库存服务。比如下订单前需要先明确是否有货，避免超订。相当于订单服务作为调用方，库存模块作为被调用方，订单服务调库存服务里面的一个接口，返回结果到订单服务。

一、库存为被调方

1、pom.xml文件。增加openfeign依赖

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  <!--  openfeign  -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

2、被调用函数

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@RestController
@RequestMapping("/stock")
public class StockController {
/*相当于订单服务作为调用方，库存模块作为被调用方，订单服务调库存服务里面的一个接口，返回结果到订单服务*/
    @RequestMapping("/test")
    public String test(String info){
        return "库存模块接收到的信息："+info;
    }
}

二、主动调方-订单

1、一样，pom增加依赖

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  <!--  openfeign  -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

2、创建service

主要@FeignClient("nacos-stock")，定义被调用的服务名

@RequestMapping("/stock/test")，是服务的路径拼接

参数用@RequestParam比如

public String test(@RequestParam("info") String info);

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@RestController
@RequestMapping("/stock")
public class StockController {
/*相当于订单服务作为调用方，库存模块作为被调用方，订单服务调库存服务里面的一个接口，返回结果到订单服务*/
    @RequestMapping("/test")
    public String test(String info){
        return "库存模块接收到的信息："+info;
    }
}

3、启动类增加包扫描注解，

@EnableFeignClients(basePackages = "com.java1234.feign")

public class NacosOrderApplication {

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@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients(basePackages = "com.java1234.feign")
public class NacosOrderApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosOrderApplication.class,args);
    }
}

4、测试controller

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@RestController
@RequestMapping("/order")
public class OrderController {

    @Autowired
    private StockFeignService stockFeignService;

    @RequestMapping("/test")
    public String test(){
       return stockFeignService.test("牛逼");
    }
}

三、启动被调用服务-再启动主动调用服务

order日志

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2026-02-24 09:59:36.270  INFO 6028 --- [nio-8082-exec-1] c.n.l.DynamicServerListLoadBalancer      : DynamicServerListLoadBalancer for client nacos-stock initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=nacos-stock,current list of Servers=[本地IP地址:8089],Load balancer stats=Zone stats: {unknown=[Zone:unknown;	Instance count:1;	Active connections count: 0;	Circuit breaker tripped count: 0;	Active connections per server: 0.0;]
},Server stats: [[Server:本地IP地址:8089;	Zone:UNKNOWN;	Total Requests:0;	Successive connection failure:0;	Total blackout seconds:0;	Last connection made:Thu Jan 01 08:00:00 CST 1970;	First connection made: Thu Jan 01 08:00:00 CST 1970;	Active Connections:0;	total failure count in last (1000) msecs:0;	average resp time:0.0;	90 percentile resp time:0.0;	95 percentile resp time:0.0;	min resp time:0.0;	max resp time:0.0;	stddev resp time:0.0]
]}ServerList:com.alibaba.cloud.nacos.ribbon.NacosServerList@2a7c8035