Spring Integration Webservices - spring-integration

Question

I am very new at spring integration, I am trying to convert following code into spring integration code but I am not able to send the request properly.
I really don't know what I am doing wrong and what to do, actually the task is to split the XML which are sending to webservices then get the response back from it and then aggregate to make it one XML.
Normal code:
connection = (HttpURLConnection) validateServer.openConnection();
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);
String parameters = "";
if (isMultipleVal) {
parameters = ADD_FUNCTION2
+ URLEncoder.encode(getxmldatalist, "UTF-8");
} else {
parameters = ADD_FUNCTION
+ URLEncoder.encode(getxmldatalist, "UTF-8");
}
LOG.info("parameters:" + parameters);
System.out.println("In client parameters "+parameters);
byte[] parameterAsBytes = parameters.getBytes();
System.out.println("Parameters as bytes "+parameterAsBytes);
connection.setRequestProperty(CONTENT_LENGTH,String.valueOf(parameterAsBytes.length));
OutputStream oStream = connection.getOutputStream();
oStream.write(parameterAsBytes, 0, parameterAsBytes.length);
oStream.flush();
oStream.close();
Spring Integration code:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:int-xml="http://www.springframework.org/schema/integration/xml"
xmlns:int-ws="http://www.springframework.org/schema/integration/ws"
xmlns:int-http="http://www.springframework.org/schema/integration/http"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:int-stream="http://www.springframework.org/schema/integration/stream"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
http://www.springframework.org/schema/integration/stream http://www.springframework.org/schema/integration/stream/spring-integration-stream.xsd
http://www.springframework.org/schema/integration/xml http://www.springframework.org/schema/integration/xml/spring-integration-xml.xsd
http://www.springframework.org/schema/integration/ws http://www.springframework.org/schema/integration/ws/spring-integration-ws.xsd
http://www.springframework.org/schema/integration/http http://www.springframework.org/schema/integration/http/spring-integration-http.xsd">
<int:channel id="requestGatewayChannel"/>
<int:gateway id="serviceGateway" service-interface="xxx.xxx.xxx" default-request-channel="requestGatewayChannel" default-reply-channel="replyGatewayChannel" />
<int:channel id="replyGatewayChannel"/>
<int:splitter ref="rootSplitter" input-channel="requestGatewayChannel" output-channel="splitterOutputChannel" method="splitRoot"/>
<int:channel id="splitterOutputChannel"/>
<bean id="rootSplitter" class="xxx.xxx.xxx.VehicleRootSpliter" />
<int-xml:marshalling-transformer id="marshaller" input-channel="splitterOutputChannel" output-channel="marshallerOutputChannel" marshaller="marshallerUnmarshaller" result-type="StringResult" />
<int:channel id="marshallerOutputChannel"></int:channel>
<int:object-to-string-transformer input-channel="marshallerOutputChannel" output-channel="stringOutputChannel"></int:object-to-string-transformer>
<int:channel id="stringOutputChannel"></int:channel>
<int:transformer id="dataTransformer" input-channel="stringOutputChannel" output-channel="dataTransformerOutputChannel" ref="xmlToEncode" method="dataTransformer"></int:transformer>
---To encode the string of xml using custom transformer---
<int:channel id="dataTransformerOutputChannel"></int:channel>
<bean id="xmlToEncode" class="xxx.xxx.xxx.DataTransformer"></bean>
<int:header-enricher default-overwrite="true" input-channel="dataTransformerOutputChannel" output-channel="enricherOutputChannel">
<int:header name="Content_length" ref="headerBean" method="valueLength"></int:header>
</int:header-enricher>
<int:channel id="enricherOutputChannel"></int:channel>
<bean id="headerBean" class="xxx.xxx.xxx.DataTransformer"></bean>
<int-http:outbound-gateway url="${toms.ws.url}" request-channel="enricherOutputChannel" reply-channel="httpOutputChannel"
header-mapper="headerMapper" http-method="POST"
expected-response-type="java.lang.String"/>
<bean id="headerMapper" class="org.springframework.integration.http.support.DefaultHttpHeaderMapper">
<property name="outboundHeaderNames" value="HTTP_REQUEST_HEADERS, Content_length"></property>
<property name="userDefinedHeaderPrefix" value=""></property>
</bean>
<int:channel id="httpOutputchannel"></int:channel>
<int:service-activator input-channel="httpOutputChannel" ref="webserviceActivator" method="checkerWeb"></int:service-activator>
<bean id="webserviceActivator" class="xxx.xxx.xxx"></bean>
<bean id="marshallerUnmarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller" >
<property name="classesToBeBound">
<list>
<value>com.xxx.xxx.xxx.VRoot</value>
</list>
</property>
</bean>
</beans>