如何反序列化JSON数组？ [英] How to Deserialize JSON Array?

问题描述

我在CXF中使用Jackson来序列化/反序列化数据。不幸的是，我很难配置CXF / Jackson来反序列化JSON数组。我很感激帮助解决这个问题。

I'm using Jackson within CXF to serialize/deserialize data. Unfortunately, I am having difficulty configuring CXF/Jackson to deserialize a JSON array. I'd appreciate help in resolving the issue.

到目前为止，大多数json数据都是对象格式，即

Up to this point most of the json data has been in object format, i.e.

{objectCollection：[{...}，{...}，{...} ...]}

但是，有问题的json数据的格式如下：

However, the json data in question is of the form:

[{... }，{...}，{...}]

Web服务端点需要GroupsDto对象（请参阅下文）
有一个属性 - 一组组，通过JSON数组传输
。

The web service endpoint expects a "GroupsDto" object (see following) that has a single property -- a collection of groups, which is transmitted via the JSON array.

@PATH(...)
public Response createGroups(GroupsDto groups) {
...
}

我将@JsonDeserialize如下添加到GroupsDto集合属性中，但它不起作用。我继续说：无法将GroupsDto的实例反序列化为START_ARRAY令牌

I added @JsonDeserialize as follows to the GroupsDto collection property, but it does NOT work. I continue to get: "Can not deserialize instance of GroupsDto out of START_ARRAY token"

public class GroupsDto {

       private Collection<GroupDto> groups;

       /**
        * @return the groups
        */
       @XmlElement(name="group")
       @JsonDeserialize(contentAs=GroupDto.class)
       public Collection<GroupDto> getGroups() {
               return groups;
       }
...
}

推荐答案

如果json数据的格式如下：

If json data is of the form:

[ {...}, {...}, {...} ]

你必须使用添加另一个类说'wrapper'：

You got to use add another class say 'wrapper':

@JsonIgnoreProperties(ignoreUnknown = true)
public class ListDto extends ArrayList<GroupDto> {

    public ListDto() {
    }
}

在取消选择时使用此课程。这种方法对我有用。

And use this class while deserailizing. This approach worked for me.

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