在 Spring 集成 outbound-gateway 中将参数从 Java 传递到 url-expression

Question

RequestGateway.Java

public interface RequestGateway {
    String echo(Map<String, String> request);
    String echo(String request);
}

Test.java

Map<String, String> requestMap = new HashMap<String, String>();
requestMap.put("acccountId", "1111222233334444");
requestMap.put("currencyCode", "USD");
requestMap.put("paymentAmount", "100.00");
RequestGateway paymentRequestGateway = context.getBean("paymentRequestGateway", RequestGateway.class);
String availableCreditBalance = paymentRequestGateway.echo(requestMap);

SIConfig.xml

<int:gateway id="paymentRequestGateway"
                 service-interface="com.api.orchestration.api.RequestGateway"
                 default-request-channel="PaymentAuthRequestChannel"
                 default-reply-channel="ResponseChannel">
        <int:default-header name="Accept" value="application/json; v=3"/>
        <int:default-header name="Content-Type" value="application/json"/>
        <int:default-header name="accountId" expression="payload.get('acccountId')"/>
</int:gateway>

<int-http:outbound-gateway
        id="IG2 Outbound Gateway"
        request-channel="IG2RequestChannel"
        reply-channel="ResponseChannel"
        header-mapper="headerMapper"
        url-expression="'http://localhost:9090/balance/account/'+ headers['accountId']"
        http-method="GET"
        expected-response-type="java.lang.String">
</int-http:outbound-gateway>

如何从 Java 代码向 url-expression 传递参数，我可能在 default-header 中的表达式做错了什么？

这适用于 http:outbound-gateway

中的 url-expression

< int:default-header name="accountId" value="1111222233334444"/>

这不..

< int:default-header name="accountId" expression="payload.get('acccountId')"/>

"Error: EL1007E:(pos 0): Property or field 'payload' cannot be found on null"

Answer 1

你不能使用

< int:default-header name="accountId" expression="payload.get('acccountId')"/>

创建消息时；消息（以及有效负载）尚不存在。

您应该可以使用 #args[0]['accountId']。

没有#rootobject评价。请参阅 表达式和 "Global" Headers here。

在 Spring 集成 outbound-gateway 中将参数从 Java 传递到 url-expression

Passing arguments from Java to url-expression in Spring Integration outbound-gateway

spring

spring-integration