@GetMapping("/findByUserId")
    public UserDTO findByUserId(@RequestParam("userId") final String userId) {
        return buildUser(userId, "hello world");
    }
Find by user id string.

@param userId the user id
@return the string
shenyu-examples/shenyu-examples-springmvc/src/main/java/org/apache/shenyu/examples/springmvc/controller/HttpTestController.java