java – XmlAdapter到JAXB绑定Joda时间间隔？

发布时间：2020-12-15 08:40:50 所属栏目：Java 来源：网络整理

导读：在我的JAXB绑定中遇到Web服务问题我已经被困了几个小时：为了准备一个必须返回Joda Time类实例(即时,持续时间,间隔等)的更大的Web服务,我开始使用只有一个返回Interval的方法的Web服务： package jodaws;import javax.jws.WebService;import javax.xml.ws.E

在我的JAXB绑定中遇到Web服务问题我已经被困了几个小时：

为了准备一个必须返回Joda Time类实例(即时,持续时间,间隔等)的更大的Web服务,我开始使用只有一个返回Interval的方法的Web服务：

package jodaws;

import javax.jws.WebService;
import javax.xml.ws.Endpoint;

import org.joda.time.Interval;

@WebService(name = "JodaWS")
public class JodaWebService {

    public Interval readInterval() {
        return new Interval(30,40);
    }

    public static void main(String[] args) {
        Endpoint.publish("http://localhost:10100/JodaWS",new JodaWebService());
    }
}

发布此Web服务我收到一个异常,指出“org.joda.time.Interval没有no-arg默认构造函数”：

29.05.2011 17:24:07 com.sun.xml.internal.ws.model.RuntimeModeler getRequestWrapperClass
INFO: Dynamically creating request wrapper Class jodaws.jaxws.ReadInterval
29.05.2011 17:24:07 com.sun.xml.internal.ws.model.RuntimeModeler getResponseWrapperClass
INFO: Dynamically creating response wrapper bean Class jodaws.jaxws.ReadIntervalResponse
Exception in thread "main" javax.xml.ws.WebServiceException: Unable to create JAXBContext
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.createJAXBContext(AbstractSEIModelImpl.java:153)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.postProcess(AbstractSEIModelImpl.java:83)
    at com.sun.xml.internal.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:244)
    at com.sun.xml.internal.ws.server.EndpointFactory.createSEIModel(EndpointFactory.java:312)
    at com.sun.xml.internal.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:178)
    at com.sun.xml.internal.ws.api.server.WSEndpoint.create(WSEndpoint.java:456)
    at com.sun.xml.internal.ws.api.server.WSEndpoint.create(WSEndpoint.java:475)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.createEndpoint(EndpointImpl.java:213)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.publish(EndpointImpl.java:143)
    at com.sun.xml.internal.ws.spi.ProviderImpl.createAndPublishEndpoint(ProviderImpl.java:102)
    at javax.xml.ws.Endpoint.publish(Endpoint.java:170)
    at jodaws.JodaWebService.main(JodaWebService.java:17)
Caused by: java.security.PrivilegedActionException: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
org.joda.time.Interval does not have a no-arg default constructor.
    this problem is related to the following location:
        at org.joda.time.Interval
        at public org.joda.time.Interval jodaws.jaxws.ReadIntervalResponse._return
        at jodaws.jaxws.ReadIntervalResponse
org.joda.time.base.BaseInterval does not have a no-arg default constructor.
    this problem is related to the following location:
        at org.joda.time.base.BaseInterval
        at org.joda.time.Interval
        at public org.joda.time.Interval jodaws.jaxws.ReadIntervalResponse._return
        at jodaws.jaxws.ReadIntervalResponse

    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.createJAXBContext(AbstractSEIModelImpl.java:140)
    ... 11 more
Caused by: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
org.joda.time.Interval does not have a no-arg default constructor.
    this problem is related to the following location:
        at org.joda.time.Interval
        at public org.joda.time.Interval jodaws.jaxws.ReadIntervalResponse._return
        at jodaws.jaxws.ReadIntervalResponse
org.joda.time.base.BaseInterval does not have a no-arg default constructor.
    this problem is related to the following location:
        at org.joda.time.base.BaseInterval
        at org.joda.time.Interval
        at public org.joda.time.Interval jodaws.jaxws.ReadIntervalResponse._return
        at jodaws.jaxws.ReadIntervalResponse

    at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:91)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:436)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:277)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1100)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:143)
    at com.sun.xml.internal.bind.api.JAXBRIContext.newInstance(JAXBRIContext.java:95)
    at com.sun.xml.internal.ws.developer.JAXBContextFactory$1.createJAXBContext(JAXBContextFactory.java:97)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:148)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:140)
    ... 13 more

所以我已经阅读了几个教程等,最后为Interval类编写了我自己的XmlAdapter – 第一个实现返回有效但是常量值：

package jodaws;

import javax.xml.bind.annotation.adapters.XmlAdapter;

import org.joda.time.Interval;

public class IntervalAdapter extends XmlAdapter<String,Interval> {
    @Override
    public Interval unmarshal(String v) throws Exception {
        return new Interval(10,20);
    }

    @Override
    public String marshal(Interval v) throws Exception {
        return "10-20";
    }
}

另外我已经注释了我的web方法来使用适配器：

package jodaws;

import javax.jws.WebService;
// import added
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import javax.xml.ws.Endpoint;

import org.joda.time.Interval;

@WebService(name = "JodaWS")
public class JodaWebService {

    // annotation added
    @XmlJavaTypeAdapter(IntervalAdapter.class)
    public Interval readInterval() {
        return new Interval(30,new JodaWebService());
    }
}

现在它应该工作.但是,当我再次启动Web服务时,我仍然会收到一个例外,尽管是另一个例外：

29.05.2011 17:27:33 com.sun.xml.internal.ws.model.RuntimeModeler getRequestWrapperClass
INFO: Dynamically creating request wrapper Class jodaws.jaxws.ReadInterval
29.05.2011 17:27:34 com.sun.xml.internal.ws.model.RuntimeModeler getResponseWrapperClass
INFO: Dynamically creating response wrapper bean Class jodaws.jaxws.ReadIntervalResponse
Exception in thread "main" javax.xml.ws.WebServiceException: java.lang.IllegalArgumentException: value class jodaws.IntervalAdapter
    at com.sun.xml.internal.ws.model.WrapperBeanGenerator.createResponseWrapperBean(WrapperBeanGenerator.java:269)
    at com.sun.xml.internal.ws.model.RuntimeModeler.getResponseWrapperClass(RuntimeModeler.java:293)
    at com.sun.xml.internal.ws.model.RuntimeModeler.processDocWrappedMethod(RuntimeModeler.java:688)
    at com.sun.xml.internal.ws.model.RuntimeModeler.processMethod(RuntimeModeler.java:612)
    at com.sun.xml.internal.ws.model.RuntimeModeler.processClass(RuntimeModeler.java:401)
    at com.sun.xml.internal.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:240)
    at com.sun.xml.internal.ws.server.EndpointFactory.createSEIModel(EndpointFactory.java:312)
    at com.sun.xml.internal.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:178)
    at com.sun.xml.internal.ws.api.server.WSEndpoint.create(WSEndpoint.java:456)
    at com.sun.xml.internal.ws.api.server.WSEndpoint.create(WSEndpoint.java:475)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.createEndpoint(EndpointImpl.java:213)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.publish(EndpointImpl.java:143)
    at com.sun.xml.internal.ws.spi.ProviderImpl.createAndPublishEndpoint(ProviderImpl.java:102)
    at javax.xml.ws.Endpoint.publish(Endpoint.java:170)
    at jodaws.JodaWebService.main(JodaWebService.java:18)
Caused by: java.lang.IllegalArgumentException: value class jodaws.IntervalAdapter
    at com.sun.xml.internal.ws.org.objectweb.asm.ClassWriter.newConstItem(ClassWriter.java:893)
    at com.sun.xml.internal.ws.org.objectweb.asm.AnnotationWriter.visit(AnnotationWriter.java:185)
    at com.sun.xml.internal.ws.model.WrapperBeanGenerator.createBeanImage(WrapperBeanGenerator.java:111)
    at com.sun.xml.internal.ws.model.WrapperBeanGenerator.createResponseWrapperBean(WrapperBeanGenerator.java:265)
    ... 14 more

那就是我被困住的地方.我究竟做错了什么？

解决方法

你是正确的,你需要在这个用例中使用 XmlAdapter.以下是如何完成的示例：

IntervalStringAdapter

下面的适配器将以格式start-end的形式将Interval实例转换为Strings.

package blog.joda;

import javax.xml.bind.annotation.adapters.XmlAdapter;

import org.joda.time.Interval;

public class IntervalStringAdapter extends XmlAdapter<String,Interval>{

    @Override
    public Interval unmarshal(String v) throws Exception {
        int dashIndex = v.indexOf('-');
        long start = Long.valueOf(v.substring(0,dashIndex));
        long end = Long.valueOf(v.substring(dashIndex + 1));
        return new Interval(start,end);
    }

    @Override
    public String marshal(Interval v) throws Exception {
        return v.getStartMillis() + "-" + v.getEndMillis();
    }

}

根

下面是如何配置属性以使用适配器的示例：

package blog.joda;

import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

import org.joda.time.Interval;

@XmlRootElement
public class Root {

    private Interval interval;

    @XmlJavaTypeAdapter(IntervalStringAdapter.class)
    public Interval getInterval() {
        return interval;
    }

    public void setInterval(Interval interval) {
        this.interval = interval;
    }

}

演示

package blog.joda;

import java.io.File;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Root.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Root root = (Root) unmarshaller.unmarshal(new File("src/blog/joda/input.xml"));

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

}

input.xml中

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
    <interval>10-20</interval>
</root>

欲获得更多信息

> http://bdoughan.blogspot.com/2011/05/jaxb-and-joda-time-dates-and-times.html

（编辑：李大同）

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