XmlAdapter到JAXB绑定Joda时间间隔？ [英] XmlAdapter to JAXB-bind Joda Time Interval?

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问题描述

我的网页服务的JAXB绑定问题已经困了几个小时：

I've been stuck for a few hours with a problem in my JAXB bindings for a web service:

为了准备一个更大的网络服务返回Joda时间类实例（即时，持续时间，间隔等）我已经开始使用只有一种方法返回间隔的Web服务：

In order to prepare for a bigger web service that has to return Joda Time class instances (Instant, Duration, Interval, etc.) I've started with a web service that has only one method returning an Interval:

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());
    }
}

发布此网络服务我收到一条说明org的例外情况.joda.time.Interval没有no-arg默认构造函数：

Publishing this web service I receive an exception stating "org.joda.time.Interval does not have a no-arg default constructor":

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



<那么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：

So I've read several tutorials etc. and ended up writing my own XmlAdapter for the Interval class - the first implementation returns valid but constant values:

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";
    }
}

此外我还注释了我的网络方法使用适配器：

And additionally I've annotated my web method to use the adapter:

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, 40);
    }

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

现在它应该有效。但是当我再次启动Web服务时，我仍然收到一个异常，但是另一个例外：

Now it should work. But when I start the web service again, I still receive an exception, though a different one:

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

这就是我被困的地方。我做错了什么？

And that's where I'm stuck. What am I doing wrong?

推荐答案

你是正确的，你需要使用 XmlAdapter 供此用途使用案件。以下是如何完成的示例：

You are correct that you will need to use an XmlAdapter for this use case. Below is an example of how it could be done:

IntervalStringAdapter

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

The adapter below will convert instances of Interval to/from Strings in the format start-end.

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();
    }

}

Root

以下是如何配置属性以使用适配器的示例：

Below is an example of how to configure the property to use the adapter:

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 

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

更多信息

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

这篇关于XmlAdapter到JAXB绑定Joda时间间隔？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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