Springboot集成OpenFeign Demo详解

//本地调用
R result = orderService.findOrderByUserId(id);
//RPC远程调用  orderService为代理对象
R result = orderService.findOrderByUserId(id);

@Bean
@LoadBalanced
public RestTemplate restTemplate() {
    return new RestTemplate();
}
 
//调用方式
String url = "http://mall-order/order/findOrderByUserId/"+id;
R result = restTemplate.getForObject(url,R.class);

@FeignClient(value = "mall-order",path = "/order")
public interface OrderFeignService {
    @RequestMapping("/findOrderByUserId/{userId}")
    public R findOrderByUserId(@PathVariable("userId") Integer userId);
}
 
//调用
@Autowired
OrderFeignService orderFeignService;
//feign调用
R result = orderFeignService.findOrderByUserId(id);

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

@EnableAsync
@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class, DruidDataSourceAutoConfigure.class })
@EnableDiscoveryClient
@EnableFeignClients  //扫描和注册feign客户端的beanDefinition
@MapperScan("com.**.**.**.**.mapper")
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

@FeignClient(value = "base-application", path = "/base")
@RequestMapping("/api/testDemo")
public interface OpenFeignBaseDemo {
 
    @PostMapping("/queryList")
    String queryList(@RequestBody JSONObject jsonObject);
}

@RestController
@RequestMapping("/openFeignDemo")
public class OpenFeignControllerDemo {
 
    @Autowired
    private OpenFeignBaseDemo openFeignBase;
 
    @PostMapping(value = "/test", produces = { "application/json;charset=utf-8" })
    public ResponseEntity test(@RequestBody JSONObject jsonObject) {
        //feign调用
        String res = openFeignBase.queryList(jsonObject);
        return new ResponseEntity(res, HttpStatus.OK);
    }
 
}

public @interface FeignClient {
    @AliasFor("name")
    String value() default "";
 
    String contextId() default "";
 
    @AliasFor("value")
    String name() default "";
 
    String qualifier() default "";
 
    String url() default "";
 
    boolean decode404() default false;
 
    Class<?>[] configuration() default {};
 
    Class<?> fallback() default void.class;
 
    Class<?> fallbackFactory() default void.class;
 
    String path() default "";
 
    boolean primary() default true;
}

feign:
  client:
    config:
      default:
        connectTimeout: 1000
        readTimeout: 6000

feign.client.config.default.connect-timeout=20000
feign.client.config.default.read-timeout=20000