RequestParam VS PathVariable

2021-07-16

Description: this article is talking about the difference between @RequestParam and @PathVariable

@RequestParam

mainly used for the controller to solve the issue of different variable names between the front end and back end, this annotation equals to request.getParam.

// value: paramter name. 
// required: default value is true, which represents that the request must have this parameter, if not it will reports the 404 error
// defaultValue: it represents the default value which means that if the request does not have the same name parameter value it will use the default value

@ResponseBody
@RequestMapping("login")
public String login(@RequestParam(value = "username") final String username,
                    @RequestParam(value = "password",required = false) final String password,
                    @RequestParam(value = "valcode",required = false) final String valcode){

}

localhost:8080/demo1?name=Aaron&age=18

@PathVariable

it mainly used for receiving http://host:port/path/{parameter}data
when the request URL is localhost:8080/demo2/Bob/12, The parameters of the URL placeholder will be bound to the corresponding parameters of the demo2 method by name

@RequestMapping(value="/demo2/{name}/{id}")
public void demo2(@PathVariable String name, @PathVaribale int id){
	...
}

@RequestBody

in post request, when the URL is /user/UpdateAddressByUaId

@RequestMapping(value = "/user/UpdateAddressByUaId")
    public R UpdateAddressByUaId(@RequestBody UserAddress userAddress){
        R rrr = myService.confirmAddress(userAddress);
        return rrr;
    }

Reference

[1] @RequestParam