常用参数注解

路径变量@PathVariable

①获取指定路径变量：

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@GetMapping("/car/{id}/owner/{userName}")    public Map<String,Object> getCar(@PathVariable("id") int id,                         @PathVariable("userName") String userName){        Map<String,Object> map = new HashMap<>();        map.put("id",id);        map.put("userName",userName);          return map;    }

 请求：http://localhost:8080/car/1/owner/zhangsan

返回：{"id":"1","userName":"zhangsan"}

②获取所有路径变量：

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//使用map提取所有的路径变量，map必须是String类型     @GetMapping("/car/{id}/owner/{userName}/{age}")     public Map<String,String> getCar(@PathVariable() Map<String,String> kv){           return kv;     }

请求：http://localhost:8080/car/2/owner/lisi/30

返回：{"id":"2","userName":"lisi","age":"30"}

 

获取请求头@RequestHeader

①获取指定请求头

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@GetMapping("/car/{id}/owner/{userName}")     public Map<String,Object> getCar(@PathVariable("id") int id,                          @PathVariable("userName") String userName,                                     @RequestHeader("User-Agent") String userAgent){         Map<String,Object> map = new HashMap<>();         map.put("id",id);         map.put("userName",userName);         map.put("userAgent",userAgent);         return map;     }

 

 请求返回：

{"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36","id":1,"userName":"zhangsan"}

 ②获取所有的请求头

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@GetMapping("/car/{id}/owner/{userName}") public Map<String,String> getCar(@PathVariable("id") int id,                      @PathVariable("userName") String userName,                                 @RequestHeader Map<String,String> heads){       return heads; }

{"host":"localhost:8080","connection":"keep-alive","cache-control":"max-age=0","sec-ch-ua":"\"Google Chrome\";v=\"105\", \"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"105\"","sec-ch-ua-mobile":"?0","sec-ch-ua-platform":"\"Windows\"","upgrade-insecure-requests":"1","user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36","accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9","sec-fetch-site":"none","sec-fetch-mode":"navigate","sec-fetch-user":"?1","sec-fetch-dest":"document","accept-encoding":"gzip, deflate, br","accept-language":"zh-CN,zh;q=0.9","cookie":"Idea-71259e56=b05a3fec-a744-4e6b-aeb2-f38a5c6b6dd0; Webstorm-142c3cad=9dee10a5-f1c0-4ed5-97c6-4b442beeb5b3"}

 

获取请求参数@RequestParam

 ①获取指定的参数

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@GetMapping("/userInfo")     public Map<String,Object> getUser(@RequestParam("name") String name,                                       @RequestParam("hobbies") List<String> hobbies){           Map<String,Object> map = new HashMap<>();         map.put("name",name);         map.put("hobbies",hobbies);         return map;     }

 

 

获取cookie的值@CookieValue

①方式一

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@GetMapping("/userInfo")     public Map<String,Object> getUser(@CookieValue("Webstorm-142c3cad") String p){           Map<String,Object> map = new HashMap<>();         map.put("Webstorm",p);         return map;     }

 

 

 请求：http://localhost:8080/userInfo?name=xiaoming

返回：{"Webstorm":"9dee10a5-f1c0-4ed5-97c6-4b442beeb5b3"}

②方式二：声明为Cookie类型

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@GetMapping("/userInfo")    public String getUser(@CookieValue("Idea-71259e56") Cookie cookie){        System.out.println(cookie.getName()+"："+cookie.getValue());          return "1";    }

 

获取请求体@RequestBody（post请求）　　

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public Map<String,Object> getUser(@RequestBody String content){      Map<String,Object> map = new HashMap<>();      map.put("content",content);        return map; }

 

 

 

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返回字符串类型

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@PostMapping("/userInfo") public String getUser(@RequestBody String content){     return content; }