Spring Integration - 转换器和标题丰富器 [英] Spring Integration - transformer and header enricher

问题描述

我的情况是这样的:我需要根据邮政编码将消息路由到三个不同的商店.

My case is like this: I need to route a message based on the zipcode to three different stores.

为此，我需要查看邮件标题以找到客户的邮政编码，并进行以下计算:

For that I need to look at the message header to find the customer's zipcode, and do the following calculation:

    if(zip < 5000)
    {
        store = "SJ";
    }
    else if(zip >= 6000)
    {
        store = "JY";
    }
    else
    {
        store = "FY";
    }

我设法使用以下自定义转换器来完成它，我用它来丰富消息标题:

I have managed to get it done using the following custom Transformer which I use to enrich the message header:

public class HeaderEnricher {
    public Message<?> transform(Message<?> message) 
    {
        int zip = message.getHeaders().get("Customer Zip", Integer.class);
        String store;

        if (zip < 5000) 
        {
            store = "SJ";
        } 
        else if (zip >= 6000) 
        {
            store = "JY";
        } 
        else 
        {
            store = "FY";
        }

        Message<?> messageOut = MessageBuilder
                .withPayload(message.getPayload())
                .copyHeadersIfAbsent(message.getHeaders())
                .setHeaderIfAbsent("store", store).build();

        return messageOut;
    }
}

正如我所说，这是有效的，但我想知道如何使用标题丰富器来做同样的事情.我之所以这么问，是因为我希望我的集成图将其说明为标题丰富器，因为这是我对上述转换器代码的意图.

As I said this is working, but I was wondering how to do the same using a header-enricher. I'm asking because I would like my integration-graph to illustrate it as a header-enricher, because that is my intention with the above transformer-code.

这可能吗?

推荐答案

你说得对！您可以使用 SpEL:

You are right! You can do it without any Java code using SpEL:

<int:header-enricher input-channel="inputChannel" output-channel="outputChannel">
    <int:header name="store"
                expression="headers['Customer Zip'] lt 5000 ? 'SJ' : headers['Customer Zip'] ge 6000 ? 'JY' : 'FY'"/>
</int:header-enricher>

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