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<SysUserVo> getOrderUserName(@RequestParam(value = "username", required = false) String username);}

@Slf4j
@Service
public class SysUserServiceFallback implements SysUserService {@Overridepublic List<SysUserVo> 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());@Overridepublic 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<String> 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<String> 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<SysUserVo> getOrderUserName(@RequestParam(value ="username", required = false) String username){return sysUserService.getOrderUserName(username);}