微服务之间Feign调用

需使用的服务

@FeignClient(name = "rdss-back-service", fallback = SysUserServiceFallback.class, configuration =
        FeignConfiguration.class)
public interface SysUserService {
    /**
     * 订单下单用户模糊查询
     */
    @GetMapping(value = "/user/getOrderUserName")
    List getOrderUserName(@RequestParam(value = "username", required = false) String username);
   }

@Slf4j
@Service
public class SysUserServiceFallback implements SysUserService {
    @Override
    public List getOrderUserName(String username) {
        log.error("调用getOrderUserName方法异常，参数：{}", username);
        return null;
    }
}

package com.rdss.common.config;
import com.rdss.common.constants.CommonConstants;
import feign.Body;
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
@Configuration
public class FeignConfiguration implements RequestInterceptor {
    private final Logger logger = LoggerFactory.getLogger(getClass());
    @Override
    public void apply(RequestTemplate template) {
        if(template==null)return;
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
                .getRequestAttributes();
        if(attributes==null){
            template.header("ticket", CommonConstants.INNER_FEIGN_TRANS_TICKET);
            return;
        }
        HttpServletRequest request = attributes.getRequest();
        if(request==null){
            return;
        }
        Enumeration headerNames = request.getHeaderNames();
        if (headerNames != null) {
            while (headerNames.hasMoreElements()) {
                String name = headerNames.nextElement();
                String values = request.getHeader(name);
                //使用body，请求头的content-length与body不一致，所以会出现too many bytes written executing错误，跳过它即可
                /*if(name.equals("content-length")){
                    continue;
                }*/
                template.header(name, values);
            }
        }
        Enumeration bodyNames = request.getParameterNames();
        if (bodyNames != null) {
            while (bodyNames.hasMoreElements()) {
                String name = bodyNames.nextElement();
                String values = request.getParameter(name);
                template.header(name, values);
            }
        }
    }
}

另外一个微服务中

 @ApiOperation(value = "订单下单用户模糊查询", notes = "订单下单用户模糊查询", httpMethod = "GET")
    @GetMapping(value="/getOrderUserName")
    public List getOrderUserName(@RequestParam(value ="username", required = false) String username){
        return sysUserService.getOrderUserName(username);
    }