使用jaxb将列表表示为根元素

问题描述

我们如何使用JAXB编组/解组包含列表的JSON中的根元素？

How can we marshal/unmarshal the root element in a JSON that contains a list using JAXB?

因此它将JSON设为

{
    "tag" : [
        {
            "id" : "a",
            "id2": "aa"
        },
        {
            "id" : "b",
            "id2" : "bb"
        },
        {
            "id" : "c",
            "id2" : "cc"
        }
    ]
}

我正在使用通过Jettison支持JSON的Apache CXF。

I am using Apache CXF which supports JSON through Jettison.

Java类可能看起来像一个在下面。可以对列表使用XmlList注释，使用XmlValue在根元素中使用该列表。问题是XmlValue不会采用用户定义的类型。

The Java class could look like the one below. One could use a XmlList annotation for the list, and XmlValue for having that list in the root element. The problem is XmlValue would not take a user-defined type.

@XmlRootElement(name = "tag")
public class test
{
    @XmlList
    @XmlValue
    private List<UserDefinedType> testList;
}

有没有办法解决这个问题。我需要这个来解组传入的JSON。从这里得到这个想法

Is there a way to get around this. I need this to work for un-marshalling an incoming JSON. Got this idea from herehttp://bdoughan.blogspot.com/2010/09/jaxb-collection-properties.html

推荐答案

这应该适用于JSON格式你提及。但是，如果您想要对某种XML格式进行编组/解组，也可能无法正常工作。

This should work for the JSON format you mentioned. However, it might not work if you want to marshall/unmarshall to a certain XML format too.

@XmlRootElement
public class Test {
    @XmlElement(name = "tag")
    private List<UserDefinedType> testList;
}

public class UserDefinedType {
    @XmlElement(name = "id")
    private String someId;

    @XmlElement(name = "id2")
    private String someId2;
}

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