ofbiz的服务(service)export成web service的方法(1)

修改service定义

在集成ofbiz的过程中，有一种需求是外部系统调用ofbiz的service，我们可以参看：
http://docs.ofbiz.org/display/OFBTECH/Service+Engine+Guide
这篇手册里面对service的配置有详细的描述，我们可以找到一个属性"export"，当export="true"时，service可以被SOAP/HTTP/JMS调用，实际上还可以被xmlrpc调用。

SERVICE ELEMENT: Attribute Required? Description Default Value

name	Y	The unique name of the service.
engine	Y	The name of the engine (defined in serviceengine.xml).
location	N	The location or package of the service's class.
invoke	N	The method name of the service.
auth	N	Does this service require authorization? (true/false)	true
debug	N	Enable verbose debugging when calling this service?	true
default-entity-name	N	The default Entity to use for auto-attributes
export	N	Is this service allowed to be accessed via SOAP/HTTP/JMS? (true/false)	false
max-retry	N	Sets the max number of times this service will retry when failed (persisted async only)	-1 (unlimited)
require-new-transaction	N	Require a new transaction for this service	true
semaphore	N	Defines how concurrent calls to this service should be handled: none: multiple calls to this service may run concurrently wait: while this service is running, queue any subsequent calls fail: while this service is running, fail any subsequent calls	none
semaphore-wait-seconds	N	When semaphore="wait" how many seconds to wait before failing the service call	300
sempahore-sleep	N	When semaphore="wait" how often (in milliseconds) to check if the waiting service call can be run	500
transaction-timeout	N	Override the default transaction timeout, only works if we start the transaction	0 (Use system default)
use-transaction	N	Create a transaction for this service (if one is not already in place)	true
validate	N	Do we validate the attributes found below for name and type matching? (true/false)	true