SpringCloud OpenFeign模板化远程通信

时间:2022-09-28 有头发的程序猿! 人气:0

1. openFeign实现

基于spring-boot-starter-parent 2.6.8，spring-cloud-dependencies 2021.0.3，一个order服务一个user服务

1.1 pom依赖

<!--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>

1.2 yaml配置

order调用端，配置的超时设置注释掉了只为记录

spring:
application:
name: orderservice
cloud:
#找对应网段的网卡不配置内部服务就走外网
inetutils:
preferred-networks: 192.168.0
nacos:
discovery:
server-addr: 192.168.0.221:8848
#feign:
# client:
# config:
# #default设置的是全局超时时间，对所有的openFeign接口服务都生效默认60s超时
# default:
# connectTimeout: 5000
# readTimeout: 5000
# #为某个服务设置超时时间优先于全局
# userservice:
# connectTimeout: 5000
# readTimeout: 5000

user服务仅需要注册

spring:
application:
name: userservice
cloud:
#找对应网段的网卡不配置内部服务就走外网
inetutils:
preferred-networks: 192.168.0
nacos:
discovery:
server-addr: 192.168.0.221:8848

远程调用依赖于注册中心，这里用的是nacos，其他的eureka也可以的

1.3 客户端调用代码

启动类上添加@EnableFeignClients注解
api接口，可以单独放在api包

@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);
}

客户端代码

	@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;
    }

1.4.服务端暴露接口

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

1.5.测试日志

c.e.order.controller.OrderController : openFeign -- start
c.e.order.controller.OrderController : openFeign -- {aaaa=bbbb, time=1657187048104}

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