如何通过MOXy生成Json来了解模型何时是数字

问题描述

要解决另一个问题，我已经从使用转到从JAXB创建的对象模型生成JSON（由Sun JAXB 2.1.12创建）。我注意到的一个区别是，在对象模型中，数字属性被定义为

To solve another problem I have moved from using Jersey to EclipseLink MOXy to generate JSON from a JAXB created object model ( created by Sun JAXB 2.1.12). One difference I've noticed is that in the object model numeric attribute are defined as

@XmlSchemaType(name = "nonNegativeInteger")
protected BigInteger count;

泽西转换为

"count":1,

但MOXy给出

"count" : "1",

如何让MOXy实现其数字字段而不是引用它。

How can I get MOXy to realize its a numeric field and not quote it.

推荐答案

更新

已修复EclipseLink 2.4.1和2.5.0流中的修复程序。您可以从以下链接下载包含此修复程序的夜间标签 2012年7月13日：

A fix has been checked into the EclipseLink 2.4.1 and 2.5.0 streams. You can download a nightly label containing this fix starting July 13, 2012 from the following link:

• http://www.eclipse.org/eclipselink/downloads/nightly.php

将数字类型封送到JSON而不带引号。在这种情况下， @XmlSchemaType 注释的存在会导致问题。这是一个错误，你可以使用以下链接来跟踪我们在这个问题上的进展：

EclipseLink JAXB (MOXy) will marshal numeric types to JSON without quotes. In this case the presence of @XmlSchemaType annotation is causing a problem. This is a bug and you can use the following link to track our progress on this issue:

• http://bugs.eclipse.org/384919

替代方法

MOXy的外部映射文档可用于覆盖字段/属性级别的映射。我们将利用它来重新映射 count 属性，以删除有问题的 @XmlSchemaType 注释。

MOXy's external mapping document can be used to override mappings at the field/property level. We will leverage this to remap the count property to remove the problematic @XmlSchemaType annotation.

oxm.xml

<?xml version="1.0"?>
<xml-bindings
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="forum11448966">
    <java-types>
        <java-type name="Root">
            <java-attributes>
                <xml-element java-attribute="count"/>
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

Root

package forum11448966;

import java.math.BigInteger;

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Root {

    @XmlSchemaType(name = "nonNegativeInteger")
    protected BigInteger count;

}

jaxb.properties

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

演示

package forum11448966;

import java.math.BigInteger;
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextProperties;

public class Demo {

    public static void main(String[] args) throws Exception {
        Map<String,Object> properties = new HashMap<String, Object>(3);
        properties.put(JAXBContextProperties.OXM_METADATA_SOURCE, "forum11448966/oxm.xml");
        properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");
        properties.put(JAXBContextProperties.JSON_INCLUDE_ROOT, false);
        JAXBContext jc = JAXBContext.newInstance(new Class[] {Root.class}, properties);

        Root root = new Root();
        root.count = BigInteger.TEN;

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(root, System.out);
    }

}

输出

{
   "count" : 10
}

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