Spring Cloud Feign的使用案例详解

server:
  port: 8080
spring:
  application:
    name: order-service
eureka:
  client:
    service-url:
      defaultZone: 你的远程eureka地址

@EnableEurekaClient

@RestController
public class OrderControll {
    @GetMapping("doOrder")
    public String doOrder(){
        return "正在制作面条";
    }
}

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

server:
  port: 8081
spring:
  application:
    name: user-service
eureka:
  client:
    service-url:
      defaultZone: 你的远程eureka地址

@EnableDiscoveryClient
@EnableFeignClients

/**
 * 下方注解:
 * value就是提供者的应用名称
 */
@FeignClient(value="order-service")
public interface UserOrderfeign {
    /**
     * 你需要调用哪个controller就写它的方法签名
     * @return
     */
    @GetMapping("doOrder")
    String doOrder();
}

@RestController
public class UserControll {
    @Autowired
    public UserOrderfeign userOrderfeign;
    @GetMapping("userDoOrder")
    public String userDoOrder(){
        System.out.println("来客人了...");
        //发起远程调用
        String str=userOrderfeign.doOrder();

        return str;
    }
}

//url拼接传参
    @GetMapping("testUrl/{name}/and/{age}")
    public String testUrl(@PathVariable("name")String name,@PathVariable("age")Integer age){
        System.out.println(name+":"+age);
        return "ok";
    }

 //url传递一个参数
    @GetMapping("oneParam")
    public String oneParam(@RequestParam String name){
        System.out.println(name);
        return "ok";
    }

    //url传递多个参数
    @GetMapping("twoParam")
    public String twoParam(@RequestParam(required = false) String name,@RequestParam(required = false)Integer age){
        System.out.println(name);
        System.out.println(age);
        return "ok";
    }

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class Order {

    private Integer id;
    private String name;
    private Double price;
    private Date time;
}

//Post请求传递一个对象
    @PostMapping("oneObj")
    public String oneObj(@RequestBody Order order){
        System.out.println(order);
        return "ok";
    }

    //Post请求传递一个对象一个参数
    @PostMapping("oneObjOneParam")
    public String oneObjOneParam(@RequestBody Order order,@RequestParam("name")String name){
        System.out.println(order);
        System.out.println(name);
        return "ok";
    }

/url拼接传参
    @GetMapping("testUrl/{name}/and/{age}")
    public String testUrl(@PathVariable("name")String name, @PathVariable("age")Integer age);

    //url传递一个参数
    @GetMapping("oneParam")
    public String oneParam(@RequestParam String name);

    //url传递多个参数
    @GetMapping("twoParam")
    public String twoParam(@RequestParam(required = false) String name,@RequestParam(required = false)Integer age);

    //Post请求传递一个对象
    @PostMapping("oneObj")
    public String oneObj(@RequestBody Order order);

    //Post请求传递一个对象一个参数
    @PostMapping("oneObjOneParam")
    public String oneObjOneParam(@RequestBody Order order,@RequestParam("name")String name);

 @GetMapping("testParam")
    public String testParam(){
        String zt = userOrderFeign.testUrl("zt", 21);
        System.out.println(zt);

        String xzl = userOrderFeign.oneParam("xzl");
        System.out.println(xzl);

        String wf = userOrderFeign.twoParam("wf", 22);
        System.out.println(wf);

        Order order= Order.builder()
                     .name("牛排")
                     .price(188D)
                     .time(new Date())
                     .id(1)
                     .build();
        String s = userOrderFeign.oneObj(order);
        System.out.println(s);

        String param = userOrderFeign.oneObjOneParam(order, "dqf");
        System.out.println(param);

        return "ok";

    }

#feign只是封装了远程调用的功能  底层还是ribbon 所以需要修改ribbon的时间
ribbon:
  ReadTimeout: 3000 #3s超时时间
  ConnectTimeout: 3000 #连接服务的超时时间

/**
     * 打印日志信息
     */
    @Bean
    public Logger.Level level(){
        return Logger.Level.FULL;
    }

logging:
  level:
    com.pengke.userservice02.feign.UserOrderfeign: debug # 需要打印请求该接口的日志...