spring cloud fegin踩坑记录

Java框架

浏览数:88

2020-6-1

1:多客户端时,fegin接口抽取到公共jar中,此时,客户端的启动类上需要对该jar中fegin所在的包进行扫描,要在spring和fegin中同时注册,否则启动时会报:“Consider defining a bean of type ‘******Feign’ in your configuration.”

@SpringBootApplication
@EnableTransactionManagement
@EnableDiscoveryClient
@ComponentScan(basePackages={"com.lcamtech.aidis.fegin","com.lcamtech.aiads.dts"})
@EnableFeignClients(basePackages = {"com.lcamtech.aidis.fegin"})
@EnableCaching
@MapperScan(basePackages = "com.lcamtech.aiads.dts.mapper")
public class Application extends SpringBootServletInitializer{

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

}

重点:

@ComponentScan(basePackages={"com.lcamtech.aidis.fegin","com.lcamtech.aiads.dts"})
@EnableFeignClients(basePackages = {"com.lcamtech.aidis.fegin"})

aidis包为包含fegin的jar, 此时@ComponentScan还需要同时扫描本项目的包。

 

2:使用Fegin传值时,GET变POST

@FeignClient(value = "SERVICE-NAME")
public interface UserAccountFeign {

    @RequestMapping(value = "/ac/exist", method = RequestMethod.GET)
    public BaseResult isExist(@RequestParam("mobile") String mobile);

}

fegin在传递时默认会将数据放在RequestBody中,所以会导致默认使用POST请求(及时@RequestMapping写着GET也没用),此时需要在参数列表中声明@RequestParam才能进行正常的GET请求。

 

3:fegin请求返回复杂对象时

 如:

public class Result{
 private string code;
 private string message;
 private Object data;

 //get/set
}

问题描述:当请求返回的是Result的一个对象时,对于该对象内部的data值,会变成一个linkedHashMap,并不会被转换成相应的类对象,若直接强转会报类型错误。

解决方法1:简单转换

/**
     * @Description: 将数据转换到相应的容器
     * @param bean
     * @param clazz
     * @return
     * @throws
     * @author SunF
     * @date 2018/6/20 10:28 
     */
    public static <T> T convertValue(Object bean, Class<T> clazz){
        try{
            ObjectMapper mapper = new ObjectMapper();
            return mapper.convertValue(bean, clazz);
        }catch(Exception e){
            log.error("错误的转换:BeanUtil.convertValue() --->" + e.getMessage());
            return null;
        }
    }

 

2:

作者:玄影镜心