WCF服务返回JSON 不是标准JSON格式问题

WCF返回的序列化JSON格式 键值对形式 {"d":"result{}"}形式，需要取到标准JSON格式数据 result{}部分的string

{"d":"{"Result":[{"StorageID":"1","StorageName":"test11","Remark":null,"IfUse":false},{"StorageID":"2","StorageName":"test2","Remark":null,"IfUse":false},{"StorageID":"3","StorageName":"test4","Remark":null,"IfUse":false},{"StorageID":"4","StorageName":"testtest","Remark":null,"IfUse":false},{"StorageID":"1158732","StorageName":"test8","Remark":null,"IfUse":false},{"StorageID":"1458527","StorageName":"000--","Remark":null,"IfUse":false},{"StorageID":"1507493","StorageName":"000--0","Remark":null,"IfUse":false},{"StorageID":"3906465","StorageName":"test9","Remark":null,"IfUse":false},{"StorageID":"3912354","StorageName":"222","Remark":null,"IfUse":false},{"StorageID":"4059909","StorageName":"33","Remark":null,"IfUse":false},{"StorageID":"4110802","StorageName":"111","Remark":null,"IfUse":false},{"StorageID":"4527897","StorageName":"test5","Remark":null,"IfUse":false},{"StorageID":"4727421","StorageName":"111test","Remark":null,"IfUse":false},{"StorageID":"4751724","StorageName":"teeee","Remark":null,"IfUse":false},{"StorageID":"5127963","StorageName":"test6","Remark":null,"IfUse":false},{"StorageID":"5127964","StorageName":"test0","Remark":null,"IfUse":false}],"ErrorStatus":6,"FeedbackMessage":"test"}"}

 @Test
    public void test4()throws IOException, DocumentException
    {
        String url = "http://127.0.0.1:8080/BaseManage/GetReservoirCacheAndroid";
        ParameterHashMap params = new ParameterHashMap();
        params.put("dep_id",1);
        String result = ServiceHelper.post(url,params);
        ResponseMessage responseMessage = getResponseMessage(result);
       // String json = JSONUtils.writeValueAsString(responseMessage.getContent()) ;
        String json = responseMessage.getContent().toString();
        System.out.println(json);


    }

public static ResponseMessage getResponseMessage(String result) throws IOException {
        JsonNode node= JSONUtils.readTree(result);
        JsonNode vv = JSONUtils.readTree(node.path("d").getTextValue());

        ResponseMessage responseMessage=new ResponseMessage();
        responseMessage.setCode( vv.path("ErrorStatus").getIntValue()+"");
        responseMessage.setContent(JSONUtils.writeValueAsString(vv.path("Result")) );
        responseMessage.setDecription(vv.path("FeedbackMessage").getTextValue());
        return responseMessage;
    }

public class ResponseMessage {
    private Object content;
    private String decription;
    private String code;

    public Object getContent() {
        return content;
    }

    public void setContent(Object content) {
        this.content = content;
    }

    public String getDecription() {
        return decription;
    }

    public void setDecription(String decription) {
        this.decription = decription;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
}

 public static String writeValueAsString(Object source) throws IOException {
        return objectMapper.writeValueAsString(source);
    }

[{"StorageID":"1","StorageName":"test11","Remark":null,"IfUse":false},{"StorageID":"2","StorageName":"test2","Remark":null,"IfUse":false},{"StorageID":"3","StorageName":"test4","Remark":null,"IfUse":false},{"StorageID":"4","StorageName":"testtest","Remark":null,"IfUse":false},{"StorageID":"1158732","StorageName":"test8","Remark":null,"IfUse":false},{"StorageID":"1458527","StorageName":"000--","Remark":null,"IfUse":false},{"StorageID":"1507493","StorageName":"000--0","Remark":null,"IfUse":false},{"StorageID":"3906465","StorageName":"test9","Remark":null,"IfUse":false},{"StorageID":"3912354","StorageName":"222","Remark":null,"IfUse":false},{"StorageID":"4059909","StorageName":"33","Remark":null,"IfUse":false},{"StorageID":"4110802","StorageName":"111","Remark":null,"IfUse":false},{"StorageID":"4527897","StorageName":"test5","Remark":null,"IfUse":false},{"StorageID":"4727421","StorageName":"111test","Remark":null,"IfUse":false},{"StorageID":"4751724","StorageName":"teeee","Remark":null,"IfUse":false},{"StorageID":"5127963","StorageName":"test6","Remark":null,"IfUse":false},{"StorageID":"5127964","StorageName":"test0","Remark":null,"IfUse":false}]