基于controller使用map接收参数的注意事项

@PostMapping("test01")
@ResponseBody                        // 如果这里不加@RequestBody，那么springMVC默认创建的是BindAwareModelMap
public Object test01( Map dataMap) { // 对象，并且都参数都不会封装进去
    System.out.println(dataMap);
    dataMap = null;
    return new BindingAwareModelMap(); // 如果返回BindingAwareModelMap对象,就会抛出异常
}

@Controller
@RequestMapping("map")
public class MapController {
    @PostMapping("test01")
    @ResponseBody                                    // 如果加了@RequestBody，那么创建的是LinkedHashMap
    public Object test01(@RequestBody Map dataMap) { // 并且参数都封装了进去(url路径参数和JSON参数都会封装进去)
        System.out.println(dataMap);
        dataMap.put("msg", "ojbk");
        return dataMap;
    }
}

#mybatis使用map封装参数，
@Select("select * from t_product where pid = #{pid} or pname = #{pname}")
List<Product> getByMap(Map map);    
#mybatisplus中有写好的方法
List<T> selectByMap(@Param("cm") Map<String, Object> columnMap);

@Data
public class Page {
    private Map dataMap = new HashMap(); // 这里可以不用初始化，加了@RequestBody，默认创建LinkdedHashMap
}
@Controller
@RequestMapping("map")
public class MapController {
    @PostMapping("test01")
    @ResponseBody
    public Object test01(@RequestBody Page page) { // 一定要加@RequestBody，否则封装不进去
        return page;
    }
}

{
    "dataMap":{
        "name":"zzhua"
    }
}

@PostMapping("/xksq/getGjclByCondition")
public ResultInfo getGjclByCondition(@RequestBody Map<String,Object> params,httpservletRequest request){
    Map<String,Object> map = new HashMap<>();
    try {
        Integer iPageIndex = (Integer) params.get("iPageIndex");
        Integer iPageSize = (Integer) params.get("iPageSize");
        PageHelper.startPage(iPageIndex!=null?iPageIndex:1,iPageSize!=null?iPageSize:10);
        String username = JwtUtil.getUsername(request.getHeader("token"));
        RfGCgl user = rfgcglMapper.selectOne(new QueryWrapper<Rfgcgl>().eq("YHMC", username));
        if(null==user){
            return ResultInfo.fail(903,"用户不存在");
        }
        params.put("qynbbh",user.getQyNbBh());
        List<Map<String, Object>> gjclByCondition = clxxQysqMapper.getGjclByCondition(params);
        PageInfo<Map<String, Object>> pageInfo = new PageInfo<>(gjclByCondition);
        map.put("total",pageInfo.getTotal());
        map.put("datas",pageInfo);
        return ResultInfo.ok(map);
    }catch (Exception e){
        e.printStackTrace();
        return ResultInfo.fail(901, "列表条件查询失败");
    }
}