使用Jaxb/Jersey将动态JSON对象映射到Java POJO

问题描述：

我想使用Jaxb/Jersey将JSON-Response映射到我的Java对象。我有这样的JSON响应：使用Jaxb/Jersey将动态JSON对象映射到Java POJO

{ 
"fuzzy": false, 
"hits": [ 
    { ... } 
], 
"filters": { 
    "category": { 
     "selected": false, 
     "values": { } 
     }, 
     "id": "category", 
     "name": "Kategorie" 
    }, 
    "shop": { 
     "selected": false, 
     "values": { 
      "7817": { 
       "count": 2, 
       "selected": false, 
       "numeric_sort_key": null, 
       "id": "7817", 
       "name": "AZUGA" 
      } 
     }, 
     "id": "shop", 
     "name": "Shop" 
    }, 
    "11223": { 
     "selected": false, 
     "values": { }, 
     "id": "certificate", 
     "name": "Vertrauensgarantie" 
    }, 
    "11334": { 
     "selected": false, 
     "values": { 
      "2290": { 
       "count": 1, 
       "selected": false, 
       "numeric_sort_key": null, 
       "id": "2290", 
       "name": "22.90" 
      } 
     }, 
     "id": "price", 
     "name": "Preis" 
    } 
}, 
"total_hits": 2

}

这是bean我想映射的JSON响应为：

import java.util.List; 

import javax.xml.bind.annotation.XmlElement; 
import javax.xml.bind.annotation.XmlRootElement; 

import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 



@XmlRootElement 
public class RestBean { 

    @XmlElement 
    private String fuzzy; 

    @XmlElement 
    private List<HitsBean> hits; 

    @XmlElement 
    private Filters filters; 

    @XmlElement 
    private String total_hits; 
}

的问题是，的子元素“过滤器”是动态的，这意味着无法事先知道子元素“11223”和“11334”的名称，因为它们是在运行时创建的。这里是我的过滤器豆：

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 

import javax.xml.bind.annotation.XmlAccessType; 
import javax.xml.bind.annotation.XmlAccessorType; 
import javax.xml.bind.annotation.XmlAnyElement; 
import javax.xml.bind.annotation.XmlElement; 
import javax.xml.bind.annotation.XmlMixed; 
import javax.xml.bind.annotation.XmlRootElement; 


@XmlRootElement(name="filters") 
@XmlAccessorType(XmlAccessType.FIELD) 
public class Filters { 

    @XmlElement 
    private Filter category; 

    @XmlElement 
    private Filter shop; 

    @XmlAnyElement 
    @XmlMixed 
    private List<Filter> filt; 
}

但注释@XmlAnyElement总是抛出了这样的错误：

23.04.2013 16:26:11 com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException 
SCHWERWIEGEND: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container 
org.w3c.dom.DOMException: INVALID_CHARACTER_ERR: An invalid or illegal XML character is specified. 
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.checkQName(CoreDocumentImpl.java:2582) 
at com.sun.org.apache.xerces.internal.dom.ElementNSImpl.setName(ElementNSImpl.java:117) 
at com.sun.org.apache.xerces.internal.dom.ElementNSImpl.<init>(ElementNSImpl.java:80) 
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.createElementNS(CoreDocumentImpl.java:2095) 
at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.startElement(SAX2DOM.java:164) 
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.closeStartTag(ToXMLSAXHandler.java:204) 
at com.sun.org.apache.xml.internal.serializer.ToSAXHandler.flushPending(ToSAXHandler.java:277) 
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.startElement(ToXMLSAXHandler.java:646) 
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerHandlerImpl.startElement(TransformerHandlerImpl.java:263) 
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.DomLoader.startElement(DomLoader.java:107) 
...

我的问题是，我应该如何映射动态生成的JSON响应，在这种情况下， “11223”和“11334”？非常感谢你提前。

问候， Suparno

JSON的XML注释？ – 2013-04-23 15:02:56

也许你可以使用'@ JsonDeserialize'或者用'ObjectMapper'注册你自己的模块？ – Willy 2013-04-24 02:27:50

@Willy你是什么意思“自己的模块与ObjectMapper”？ – 2014-06-26 13:27:14

答

它使用杰克逊映射器和@JsonAnyGetter/@JsonAnySetter（org.codehaus.jackson.annotate封装）注解非常简单。
级过滤器

public class Filters { 

    private Filter category; 

    private Filter shop; 

    private Map<String, Filter> filt = new HashMap<String, Filter>(); 

    @JsonAnyGetter 
    public Map<String, Filter> any() { 
     return filt; 
    } 

    @JsonAnySetter 
    public void set(String name, Filter value) { 
     filt.put(name, value); 
    } 

    // getters/setters for category and shop 
}

此外，在所有类不使用@XmlAccessorType(XmlAccessType.FIELD)序列化到JSON（这里使用getter/setter方法以及默认XmlAccessorType这一点很重要）。使用getter/setter对和默认存取器类型。

使用Jaxb/Jersey将动态JSON对象映射到Java POJO

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