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@RequestBody、@RequestParam、@PathVariable、@Param的区别

程序员文章站 2022-04-27 20:23:42
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@RequestBody

一般用来处理Content-Type:"application/json,application/xml"两种格式的请求,能够将传过来的参数自动封装成指定类上。
请求:

v1/liveRoomUser/agreeApply
{
    "liveRoomId": 1,
    "uid": 1
}

后端代码:

    @RequestMapping(value = "agreeApply", method = RequestMethod.POST)
    public JsonResponse agreeApply(@RequestBody LiveRoomUserForm liveRoomUserForm) {
        LiveRoom liveRoom = liveRoomService.getById(liveRoomUserForm.getLiveRoomId());
        return  JsonResponse.success(liveRoom) ;
    }

@RequestParam

通过注解@RequestParam可以轻松的将URL中的参数绑定到处理函数方法的变量中。
请求:

v1/list?page=1&pageSize=1

后端代码:

	@RequestMapping(value = "", method = RequestMethod.GET)
	public JsonResponse list(
			@RequestParam(value = "page", required = false,defaultValue = "1") Integer page,
			@RequestParam(value = "pageSize",required = false, defaultValue = "20") Integer pageSize) {
		Page<LiveRoomCustomVo> list = liveCustomService.findRoomListByWhere(page,pageSize);
		return JsonResponse.success(list);
	}

@PathVariable

通过 @PathVariable 可以将 URL 中占位符参数绑定到控制器处理方法的入参中:URL 中的 {xxx} 占位符可以通过@PathVariable(“xxx”) 绑定到操作方法的入参中。
请求:

v1/info/{roomId}  

后端代码:

	@RequestMapping(value = "/info/{id:[1-9]+}", method = RequestMethod.GET)
	public JsonResponse info(@PathVariable Integer id) {
		PublishLiveForm publishLiveForm = liveRoomService.info(id);
		return JsonResponse.success(publishLiveForm);
	}

@Param

作用与dao层,把方法中的传参映射到sql中。

@Mapper
public interface UserMapper {
    Integer insert(@Param("username") String username, @Param("address") String address);
}

对于xml文件如下:

insert into user (username,address) values (#{username},#{address});