Shulou(Shulou.com)06/01 Report--

Editor to share with you how SpringCloud passes List type parameters through Feign, I believe most people don't know much about it, so share this article for your reference. I hope you can learn a lot after reading this article. Let's learn about it together.

Passing List type parameters through Feign

First of all, to be clear, SpringCloud through Fegin if there are multiple parameters, one of which is List, then it can not be passed, a single List is OK.

1. Single List entity pass @ RequestMapping ("/ secret/batchInsert") public int batchInsert (@ RequestBody List batchSecretBOList) {return batchSecretService.batchInsert (batchSecretBOList);} 2, basic type pass

Basic types can be passed through an array, and the code is as follows:

@ RequestMapping (value = "/ stat/merchant/get_merchant_compare_info", method = RequestMethod.POST) @ ResponseBodyMerchantCompareTotalInfo getMerchantCompareInfo (@ RequestParam ("licenseNoList") String [] licenseNoList); 3. Entity type transfer

Entity types can be passed after converting List to String through FastJson, as follows:

/ / caller code String contracts = JSONObject.toJSONString (contractBOList); contractDao.contractBatchSetRedis (contracts, 60 * 60); / / receiver code @ PostMapping ("/ contract/contractBatchSetRedis") void contractBatchSetRedis (@ RequestParam ("contractBOList") String contractBOList, @ RequestParam ("expire") long expire) {List contracts = JSONObject.parseArray (contractBOList, ContractBO.class); if (contracts = = null | contracts.size () = 0) {return } / / batch set data redisUtil.getRedisTemplate (). ExecutePipelined ((RedisCallback) connection-> {for (ContractBO contract: contracts) {connection.setEx ((RedisPrefixConst.CONTRACT_PREFIX + contract.getBusinessCode () + RedisPrefixConst.UNDERLINE_SEPARATOR + contract.getContractNo ()). GetBytes (), expire, JSONObject.toJSONString (contract). GetBytes ();} return null;});}

Fegin has many limitations. If you want to pass List, you can only convert it to a string by the above method, and then pass parameters.

Feign's pit when the parameter is List

When we use Feign to call the service interface, sometimes when the interface parameter is List collection, we can not use the List interface class as the parameter, we can only use the List implementation class.

Erroneous writing

Correct writing method

This is all the content of the article "how SpringCloud passes List type parameters through Feign". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.