SpringCloud OpenFeign超详细讲解模板化远程通信的实现

<!--nacos服务注册与发现-->
<dependency>
	<groupId>com.alibaba.cloud</groupId>
	<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
	<version>2021.0.1.0</version>
</dependency>
<!--远程服务调用-->
<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-loadbalancer</artifactId>
</dependency>
<!--服务调用feign-->
<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

@FeignClient(value = "userservice")
//没有注册中心的服务调用使用  testFeign/随便写
//@FeignClient(value = "testFeign",url = "http://192.168.0.199:7540")
public interface UserService {
    //默认是@RequestBody注解参数 
    //如果使用其他注解一定要带上value 否者会报错 RequestParam.value() was empty on parameter 1
    @GetMapping("/getTime/{uuid}")
    String getTime(@PathVariable("uuid") String uuid, @RequestParam("name") String name);
    @PostMapping("/postTime")
    Map<String, Object> getTime(@RequestBody Map<String, Object> params);
}

	@Resource
    UserService userService;
    @GetMapping("/test")
    public String test() throws Exception {
        log.info("openFeign -- start");
        Map<String, Object> time = userService.getTime(resMap);
        log.info("openFeign -- {}", time);
        return template + ":" + time;
    }

    @PostMapping("/postTime")
    public Map<String, Object> getTime(@RequestBody Map<String, Object> params) {
        params.put("time", new Date().getTime());
        return params;
    }