java - SAAJ 与 MTOM + XOP 兼容吗？

Question

我正在尝试使用 MTOM + XOP 在 Spring Web 服务中返回一个 byte[] 但是当编码结果时它会抛出一个带有消息的 SAXParseException:

cvc-type.3.1.2: 元素'dataHandler'是一个简单类型，所以它必须没有元素信息项[children]。

似乎在写入 XOP 标记后， validator 遇到它而不是它期望的 byte[] 内容，并抛出一个 FATAL 级别的 SAXParseException 来停止进程。

我正在使用:

• JDK 1.7
• SAAJ 1.3
• SOAP 1.1
• Spring 4.1.4.RELEASE
• Spring WS 2.2.0.RELEASE

提前致谢

Answer 1

针对我的情况，我找到了两个解决方法:

1. 没有将 xmlschema 设置为编码器。

2. 将 ValidationEventHandler 设置为跳过 XOP 失败的编码器。

这是将 ValidationEventHandler 设置为跳过 XOP 失败的编码器的示例:

抽象父类(super class):

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;

abstract class XopAwareValidationEventHandler implements ValidationEventHandler {

  private static final String CVC_TYPE_3_1_2 = "cvc-type.3.1.2";

  private ValidationEventHandler realHandler;

  XopAwareValidationEventHandler(final ValidationEventHandler handler) {
    this.setRealHandler(handler);
  }

  @Override
  public boolean handleEvent(final ValidationEvent event) {
    final boolean result = this.getRealHandler().handleEvent(event);
    if (!result) {
      if (event.getMessage() != null && event.getMessage().startsWith(CVC_TYPE_3_1_2)) {
        return this.isXopEvent(event);
      }
    }
    return result;
  }

  abstract boolean isXopEvent(ValidationEvent validationEvent);

  private ValidationEventHandler getRealHandler() {
    return realHandler;
  }

  private void setRealHandler(final ValidationEventHandler realHandler) {
    this.realHandler = realHandler;
  }
}

解码器的具体类:

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;

class XopAwareUnmarshallingValidationEventHandler extends XopAwareValidationEventHandler {

  private static final String XOP_INCLUDE = "xop:Include";

  XopAwareUnmarshallingValidationEventHandler(final ValidationEventHandler handler) {
    super(handler);
  }

  @Override
  boolean isXopEvent(final ValidationEvent validationEvent) {
    final ValidationEventLocator locator = validationEvent.getLocator();
    return locator != null && locator.getNode() != null &&
        locator.getNode().getFirstChild() != null &&
        XOP_INCLUDE.equals(locator.getNode().getFirstChild().getNodeName());
  }
}

对于编码器，我正在搜索标识大小写的条件，因为 ValidationEventLocator 仅设置了对象，它可以是任何内容。

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.ValidationEventLocator;

public class XopAwareMarshallingValidationEventHandler extends XopAwareValidationEventHandler {

  public XopAwareMarshallingValidationEventHandler(final ValidationEventHandler handler) {
    super(handler);
  }

  boolean isXopEvent(final ValidationEvent validationEvent) {
    final ValidationEventLocator locator = validationEvent.getLocator();
    return locator != null && locator.getNode() == null;
  }
}

org.springframework.oxm.jaxb.Jaxb2Marshaller 激活 MTOM 并添加两个事件处理程序的子类:

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

import org.springframework.oxm.jaxb.Jaxb2Marshaller;

import XopAwareMarshallingValidationEventHandler;
import XopAwareUnmarshallingValidationEventHandler;

public class XopAwareJaxb2Marshaller extends Jaxb2Marshaller {

  public XopAwareJaxb2Marshaller() {
    this.setMtomEnabled(true);
  }

  protected void initJaxbMarshaller(final Marshaller marshaller) throws JAXBException {
    super.initJaxbMarshaller(marshaller);

    marshaller.setEventHandler(new XopAwareMarshallingValidationEventHandler(marshaller.getEventHandler()));
  }

  protected void initJaxbUnmarshaller(final Unmarshaller unmarshaller) throws JAXBException {
    super.initJaxbUnmarshaller(unmarshaller);

    unmarshaller.setEventHandler(new XopAwareUnmarshallingValidationEventHandler(unmarshaller
        .getEventHandler()));
  }
}