spring mvc 对已经是json字符串的数据如何？

public class Result<T> implements Serializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = 4389582745444177494L;
	public final static int CODE_FAIL = -1;
	public final static int CODE_SUCCUSS = 200;
	public Result() {
		this.timetemp = System.currentTimeMillis();
		this.code = CODE_FAIL;
	}
	public Result(int code) {
		this();
		this.code = code;
	}
	public Result(int code, String msg) {
		this(code);
		this.msg = msg;
	}
	public Result(int code, String msg, T data) {
		this(code,msg);
		this.setData(data);
	}
	
	//返回状态码
	private int code;
	//返回消息
	private String msg;
	//时间戳
	private long timetemp;
	//返回数据
	private T data;
	public int getCode() {
		return code;
	}
	public void setCode(int code) {
		this.code = code;
	}
	public String getMsg() {
		return msg;
	}
	public void setMsg(String msg) {
		this.msg = msg;
	}
	/**
	 * @return the data
	 */
	public T getData() {
		return data;
	}
	/**
	 * @param data the data to set
	 */
	public void setData(T data) {
		this.data = data;
	}
	/**
	 * @return the timetemp
	 */
	public long getTimetemp() {
		return timetemp;
	}
	/**
	 * @param timetemp the timetemp to set
	 */
	public void setTimetemp(long timetemp) {
		this.timetemp = timetemp;
	}
}

@RequestMapping(value="/get",method=RequestMethod.POST)
	public Result<OrderVO> get(@RequestParam(name="mobile",defaultValue="")String mobile,
			@RequestParam(name="openid",required=true)String openid,
			@RequestParam(name="storeid",required=true)String storeid,
			@RequestParam(name="pagestore",required=true)String pagestore,
			@RequestParam(name="deviceid",required=true)String deviceid,
			@RequestParam(name="couponid",required=true)String couponid,
			@RequestParam(name="timetemp",defaultValue="")String timetemp,
			@RequestParam(name="sign",defaultValue="")String sign) {
		
		//签名不通过
		Map<String, String> signMap = new HashMap<String, String>();
		signMap.put("openid",openid);  
		signMap.put("storeid",storeid);  
		signMap.put("pagestore",pagestore);  
        signMap.put("deviceid",deviceid);
        signMap.put("couponid",couponid);
        signMap.put("timetemp",timetemp);
		if(!weixinBiz.checkSign(signMap, sign)){
			return new Result<>(Result.CODE_FAIL,"签名错误");
		}
		
		//判断参数中的openid，若为空则取cookie的openid
		if(StringUtils.isBlank(openid)){
			openid = AppUtils.openId();
		}
		
		OrderVO orderVO = null;
		try {
//			//根据openid查找用户信息
//			Member member = weixinBiz.getMember(openid);
//			if(member == null) {
//				member = weixinBiz.bindMember(storeid, openid, mobile);
//			}
//		
//			//关注商铺
//		
//			//发放优惠券
//			orderVO = couponBiz.sendCoupon(couponid, member, "");
		} catch(UserExecuteFailedException userException) { 
			return new Result<>(userException.getCode(),userException.getMessage());
		} catch (Exception e) {
			log.error(MessageFormat.format("==用户（{0}）摇一摇领取优惠券（{1}）时出现异常",openid,couponid));
			return new Result<>(Result.CODE_FAIL,"系统繁忙，稍后重试");
		}
		return new Result<OrderVO>(Result.CODE_SUCCUSS,"OK",orderVO);
	}