Spring Soap 拦截器如何修改消息的内容? [英] How can a Spring Soap interceptor modify the contents of a message?

问题描述

我正在尝试为 Web 服务编写拦截器，该服务将在发送到端点之前修改 Soap 消息的内容.如果客户端发送了一条消息，其中某个元素的值为 1，我希望能够将该元素更改为 2，这样当消息到达端点时，客户端看起来好像提交了 2 而不是1. 我不确定这是一项让我感到困惑的困难任务，还是一项我做得比它需要的更难的简单任务.

I'm trying to write an interceptor for a web service that will modify the contents of the Soap message before is sent on to the endpoint. If a client sent a message where the value of some element is 1, I want to be able to alter that element to a 2 so that, when the message arrives at the endpoint, it looks as if the client submitted a 2 instead of a 1. I'm not sure if this is a difficult task which is elluding me, or an easy task which I am making harder than it needs to be.

我已经遍历了一些 Spring 拦截器；但是验证和日志拦截器不会改变传输中的消息.Wss4jSecurityInterceptor 确实向 MessageContext 添加了一些属性；但我一直无法利用它正在做的任何事情.我有一个拦截器的外壳；但没有做任何有价值的事情.

I have stepped through some of the Spring interceptors; but the validation and logging interceptors don't every alter the message that is in transit. The Wss4jSecurityInterceptor does add some properties to the MessageContext; but I haven't been able to leverage anything that it is doing. I have a shell of an interceptor; but nothing that is doing anything of any value.

public boolean handleRequest(MessageContext messageContext, Object endpoint)
        throws Exception {

    SaajSoapMessage saajSoapMessage = (SaajSoapMessage) messageContext
            .getRequest();
    SOAPMessage soapMessage = saajSoapMessage.getSaajMessage();
    SOAPBody soapBody = soapMessage.getSOAPBody();

    return true;
}

我希望有其他人已经解决了这个特定问题的机会.任何见解将不胜感激.谢谢.

I was hoping there was a chance that soembody else had already solved this particular problem. Any insight would be appreciated. Thanks.

推荐答案

修改有效负载有点棘手.我发现使这项工作有效的唯一方法是在 SoapBody 上使用 getPayloadSource() 和 getPayloadResult() 方法，它们公开 javax.xml.transform - 用于操作数据的友好对象.

Modifying the payload is a little bit tricky. The only way I've found to make this work is to use the getPayloadSource() and getPayloadResult() methods on SoapBody, which expose javax.xml.transform-friendly objects for manipulating the data.

这是令人讨厌的重量级，但你可以这样做:

It's annoyingly heavyweight, but you can do something like this:

Transformer identityTransform = TransformerFactory.newInstance().newTransformer();
DOMResult domResult = new DOMResult();
identityTransform.transform(soapBody.getPayloadSource(), domResult);

Node bodyContent = domResult.getNode(); // modify this

identityTransform.transform(new DOMSource(bodyContent), soapBody.getPayloadResult());

我很想看到一种更好的方式来做到这一点.

I'd love to see a better way of doing this.

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