JCO--ＡＰＩ１

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要让JAVA程序能访问SAP系统，一般通过SAP JCO接口进行通讯，在获取到SAP的连接时需求提供一些连接参数，这些参数在最新的JCO 3.0中需要被保存到一个带有扩展名

登录配置

jco.client.lang=EN
jco.client.client=001
jco.client.passwd=xxxxxx
jco.client.user=STONE
jco.client.sysnr=00
jco.client.ashost=192.168.65.100

http://upload-images.jianshu.io/upload_images/1765749-97643b097b86c2a3.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240&_=5670223

执行sap程序的顺序---定义数据提供者（设置监听，同步更改配置文件）-----------jco操作类（读取配置文件，Environment注册提供者，加载配置文件，同步设置）这里数据定义着就已经可以访问了

JCoDestinationManager数据操作类

---------获取destination --------------JCoRepository-----------获取function---------execute（指定目的地，执行function）

DestinationDataProvider

The class implements this interface to provide the properties for a client connection to a remote SAP system. Depending on the type of middleware layer loaded, the properties that need to be provided by the implementation of the DestinationDataProvider may vary.

此接口的目的是提供配置文件为客户端连接ｓａｐ，通过中间件加载，就是获取ｐｒｏｐｏｅｒｔｉｅｓ，感觉老外说的话很别扭，特别简洁，难道是他们的程序员水平比我们高吗，

Environment

com.sap.conn.jco.ext.Environment

注册的DestinationDataProvider实现

JCoDestinationManager

.getDestination方法查找连接参数

JCoDestination

identifies a physical destination of a function call. It contains all required properties in order to connect to an SAP system. Note: JCoDestination is only a configuration instance containing all necessary information for JCo runtime how create a connection. It does not creates or holds any connections by itself. JCo Runtime creates connections and caches them if defined by destination configuration.

map.remove("1") != null ------------------map remove会有返回值

有好多

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