Custom Socket Factory to Configure local TCP Port Bear in mind this will fail if the port is already in use (even if it's in TIME_WAIT since the last use)

config.xml

	<int-ip:tcp-connection-factory id="client"
		type="client"
		host="localhost"
		port="${availableServerSocket}"
		single-use="true"
		socket-factory-support="localPortProvider"
		so-timeout="10000"/>

	<bean id="localPortProvider" class="foo.LocallPortTcpSocketFactorySupport">
		<constructor-arg value="10.0.0.3" />
		<constructor-arg value="12345" />
	</bean>

LocallPortTcpSocketFactorySupport.java

/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package foo;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.net.ServerSocketFactory;
import javax.net.SocketFactory;

import org.springframework.integration.ip.tcp.connection.support.TcpSocketFactorySupport;

/**
 * @author Gary Russell
 *
 */
public class LocallPortTcpSocketFactorySupport implements TcpSocketFactorySupport {

	private final int localPort;

	private final InetAddress localInterface;

	private LocallPortTcpSocketFactorySupport(String localInterfaceIp, int localPort) throws IOException {
		this.localInterface = InetAddress.getByName(localInterfaceIp);
		this.localPort = localPort;
	}

	@Override
	public ServerSocketFactory getServerSocketFactory() {
		throw new UnsupportedOperationException("This does not support server sockets");
	}

	@Override
	public SocketFactory getSocketFactory() {
		return new MySocketFactory();
	}

	private class MySocketFactory extends SocketFactory {

		private final SocketFactory delegate = SocketFactory.getDefault();

		@Override
		public Socket createSocket() throws IOException {
			return delegate.createSocket();
		}

		@Override
		public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
			return this.delegate.createSocket(host, port, localInterface, localPort);
		}

		@Override
		public Socket createSocket(InetAddress host, int port) throws IOException {
			return this.delegate.createSocket(host, port);
		}

		@Override
		public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException,
				UnknownHostException {
			return this.delegate.createSocket(host, port, localHost, localPort);
		}

		@Override
		public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) throws IOException {
			return this.delegate.createSocket(address, port, localAddress, localPort);
		}

	}
}