1.@PathVariable 全称是url占位符 @GetMapping("/pathVariable2/{id}") public String pathVariable2(@PathVariable(value = "id") String id){ return id; } 调用：http://localhost:8082/pathVariable2/2 2.传递字符串参数 -1 不带注解 @GetMapping("/requestParam") public String requestParam(String userName,String age){ return userName+":xxx:"+age; } 1）http://localhost:8082/requestParam 返回 null:xxx:null 2）http://localhost:8082/requestParam?userName=zhangsan 返回 zhangsan:xxx:null 3）htt