我看看

试了一下, 需要设置consumes

    @POST
    @ApiOperation(value = "回显接口", notes = "发我一个字符串,原样回复一个字符串", httpMethod="POST", consumes="application/x-www-form-urlencoded")
    @ApiImplicitParams({@ApiImplicitParam(name = "text", paramType="form", value = "想发啥就发啥", dataType="string", required = true)})
    @At
    @Ok("raw")
    public String echo(@Param("text") String text) {
        return text;
    }