无法反序列化对象的实例出来START_ARRAY令牌春季Webservice的 [英] Cannot deserialize instance of object out of START_ARRAY token in Spring Webservice

问题描述

我中号目前有连接到我的web服务在Android上的麻烦。我用杰克逊核心/数据绑定/注解2.2.4和Spring RESTWebService。如果我从浏览器访问URL，我可以看到JSON响应：（服务器返回目录\店\样子：）

I'm m currently having trouble connecting to my webservice on android. I use jackson-core/databind/annotation-2.2.4 and Spring RESTWebService. If I access the URL from browser I can see the JSON response: (server return List\Shop\ looks like:)

[{"name":"shopqwe","mobiles":[],"address":{"town":"city",
"street":"streetqwe","streetNumber":"59","cordX":2.229997,"cordY":1.002539},
"shoe" [{"shoeName":"addidas","number":"631744030","producent":"nike","price":999.0,
"sizes":[30.0,35.0,38.0]}]

从客户终端（Android应用程序），我收到此错误信息：

From a Client endpoint (Android application) I receive this error message:

08-26 17:43:07.406: E/AllShopsAsyc(28203): Could not read JSON: Can not deserialize
instance of com.auginzynier.data.ShopContainer out of START_ARRAY token
08-26 17:43:07.406: E/AllShopsAsyc(28203):  at [Source:
com.android.okhttp.internal.http.HttpTransport$ChunkedInputStream@41efbd48; line: 1,
column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException:
Can not deserialize instance of com.auginzynier.data.ShopContainer out of START_ARRAY
token
08-26 17:43:07.406: E/AllShopsAsyc(28203):  at [Source:
com.android.okhttp.internal.http.HttpTransport$ChunkedInputStream@41efbd48; line: 1,
column: 1] 
08-26 17:43:07.406: E/AllShopsAsyc(28203):
org.springframework.http.converter.HttpMessageNotReadableException: Could not read
JSON: Can not deserialize instance of com.auginzynier.data.ShopContainer out of
START_ARRAY token

我的服务器请求

My server request

RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
ShopContainer response  = restTemplate.getForObject(url, ShopContainer.class);

在这里ShopContainer是：

where ShopContainer is:

public class ShopContainer {
   private List<Shop> shops;

的店，地址和鞋的结构是（我想念这里的getter和setter）：

structure of Shop, Address and Shoe is (I miss here getters and setters):

public class Shop {
@JsonProperty("name")    private String name;
@JsonProperty("mobiles")   private List<String> mobiles = new ArrayList<String>();
@JsonProperty("address")   private Address address;
@JsonProperty("shoe") private List<Shoe> shoe = new ArrayList<Shoe>();

public class Address {
@JsonProperty("town") private String town;
@JsonProperty("street") private String street;
@JsonProperty("streetNumber") private String streetNumber;
@JsonProperty("cordX") private Double cordX;
@JsonProperty("cordY") private Double cordY;

public class Shoe {
@JsonProperty("shoeName") private String shoeName;
@JsonProperty("number") private String number;
@JsonProperty("producent") private String producent;
@JsonProperty("price") private Double price;
@JsonProperty("sizes") private List<Double> sizes = new ArrayList<Double>();

我期待在这里和谷歌，但仍无法找出我失踪在这一点上有什么 任何的反应将是很大的帮助。

I look around here and google but still can't figure out what I am missing at this point Any response would be greatly helpful.

问候。

@UPDATE

我修复JSON格式在服务器RequestMetod.GET使用杰克逊ObjectMaper。现在，它返回一个字符串。

I fix JSON format by using jackson ObjectMaper in server RequestMetod.GET. Now it return a String.

list is List<Shop>

ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(new File("D:\\Android\\shop.json"), list);
System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(list));
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(list);

JSON控制台的样子：

JSON in console looks like:

[ {
  "name" : "shopqwe",
  "mobiles" : [ ],
  "address" : {
    "town" : "city",
    "street" : "streetqwe",
    "streetNumber" : "59",
    "cordX" : 2.229997,
    "cordY" : 2.002539
  },
  "shoe" : [ {
    "shoeName" : "addidas",
    "number" : "631744033",
    "producent" : "nike",
    "price" : 10.0,
    "sizes" : [ 30.0, 35.0, 38.0 ]
  } ]
} ]

要求仍然不能正常工作 - 错误是一样的。

Request still doesn't work - error is the same.

推荐答案

您JSON包含数组，但你试图解析它作为对象。 出现此错误的原因对象必须从启动{。

Your json contains an array, but you trying to parse it as object. This error occurs because object must start from {.

您有2个选项：

1. 您可以摆脱 ShopContainer 类，并使用商店[] 而不是

ShopContainer response  = restTemplate.getForObject(
    url, ShopContainer.class);

替换

Shop[] response  = restTemplate.getForObject(url, Shop[].class);

，然后让物体形成，或任何你需要的。

and then make object form it or whatever you need.

您可以更改您的服务器返回的对象，而不是列表

You can change your server to return object instead of list

return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(list);

替换

return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(
    new ShopContainer(list));

这篇关于无法反序列化对象的实例出来START_ARRAY令牌春季Webservice的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！