1.修改事务流水号的生成规则，两位随机英文字母+时间戳

epmet-gateway/src/main/java/com/epmet/filter/FeignRequestFilter.java

@@ -17,8 +17,6 @@ import org.springframework.stereotype.Component;
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Mono;
 
-import java.util.UUID;
-
 /**
  * Feign调用发送请求的Filter
  * 目前用于封装用户相关信息到request，供上游微服务使用
@@ -58,11 +56,28 @@ public class FeignRequestFilter implements GlobalFilter, UserTokenFilter {
         if (baseTokenDto != null) {
             ServerHttpRequest build = exchange.getRequest().mutate()
                     .header(AppClientConstant.USER_ID, new String[]{baseTokenDto.getUserId()})
-                    .header(AppClientConstant.TRANSACTION_SERIAL_KEY, new String[]{UUID.randomUUID().toString()})
+                    .header(AppClientConstant.TRANSACTION_SERIAL_KEY, new String[]{getTransactionSerial()})
                     .build();
             return chain.filter(exchange.mutate().request(build).build());
         }
 
         return chain.filter(exchange);
     }
+
+    /**
+     * 获取事务流水号
+     * @return
+     */
+    public static String getTransactionSerial() {
+        String[] letterPool = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n"
+                , "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"};
+
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < 2; i++) {
+            sb.append(letterPool[(int) (Math.random() * 25)]);
+        }
+
+        sb.append(System.currentTimeMillis());
+        return sb.toString();
+    }
 }