@RequestParam @PathVirable @RequestBody @ApiParam的区别

@RequestParam

最常用
用value指定参数名字，required字段指定参数是否必须，默认为true，当required=false时，一般配合着defaultValue="xx"使用

对应的url是这样的：

https://localhost/requestParam/test?key1=value1&key2=value2

 @RequestMapping("/getXxx")@ResponseBodypublic String getXxx(HttpServletRequest request,@RequestParam(value="compareId", required = false)String compareId,@RequestParam(value="networkType", required = false)String networkType,@RequestParam(value="simulateDate", required = false)String simulateDate,@RequestParam(value="productType", required = false)String productType,@RequestParam("pageNum")int pageNum, @RequestParam("pageSize")int pageSize){}

@PathVirable

url是RestFul风格时，就无法用@RequestParam了，就用这个

对应的url是这个样子的

https://localhost/pathVariable/test/value1/value2

用value指定参数名字，required字段指定参数是否必须，默认为true

@RequestMapping("/pathVariable/test/{param}")@ResponseBodypublic String pathVariableTest(@PathVariable(value = "param",required = false)String param){return "pathVariable接受到的参数:" + param;}

@RequestBody

使用@RequestBody注解表示请求参数来自于请求体, 前台请求参数需以JSON格式传递
对应的url
@RequestParam注解用于从前端传递过来的请求参数中获取单个或多个参数，一般用于GET请求，表示前端向后端索要数据。而@RequestBody注解则是从请求体中获取数据，一般用于POST请求，表示前端给后端提供数据
@RequestBody注解接受到的JSON实体直接被转为java对象

 @PostMapping("/realTimeExport")@Operation(summary = "实时查询车辆信息导出")public MessageBean<String> realTimeExport(@RequestBody CarInfoRealTimeQueryParamDTO carInfoRealTimeQueryParamDTO) {String export = carInfoService.export(2,null,carInfoRealTimeQueryParamDTO);return MessageBean.success(export);}

@ApiParam

使用swagger的时候才用得到这个注解，相当于swagger版本的@RequstParam

    @RequestMapping(value="uploadFile",consumes = "multipart/*",headers = "content-type=multipart/form-data",method = RequestMethod.POST)@ResponseBodypublic DataResult uploadFile(@ApiParam(value = "上传文件",required = true) MultipartFile file, String resumeID,HttpServletRequest request)throws IOException{}}