JCO 自定义DestinationDataProvider
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.jcoDestination的文件中,这个文件同时被保存在应用程序的安装目录中。因为这只中一个纯文本文件,所有的连接参数并没有被加密,这样对于公用程序可能有安全问题。要使用登陆连接更加安全可以实现自定义的 DestinationDataProvider 实现:
此接口只有简单的三个方法:
interface DestinationDataProvider { Properties getDestinationProperties(java.lang.String destinationName); void setDestinationDataEventListener(DestinationDataEventListener eventListener); boolean supportsEvents(); }
getDestinationProperties 当Java程序获取到SAP的连接时,jco会从这里读取连接属性,你可以编程动态的设定这些属性
setDestinationDataEventListener 设置一个连接事件监听器,实现一个监听器,当JCO连接SAP以获得通知
supportsEvents 返回是否被实现的DestinationDataProvider有事件监听器
实现一个自定义Provider:
static class MyDestinationDataProvider implements DestinationDataProvider { private DestinationDataEventListener eL; private Properties ABAP_AS_properties; public Properties getDestinationProperties(String destinationName) { if(destinationName.equals("ABAP_AS") && ABAP_AS_properties!=null) return ABAP_AS_properties; return null; //alternatively throw runtime exception //throw new RuntimeException("Destination " + destinationName + " is not available"); } public void setDestinationDataEventListener(DestinationDataEventListener eventListener) { this.eL = eventListener; } public boolean supportsEvents() { return true; } void changePropertiesForABAP_AS(Properties properties) { if(properties==null) { eL.deleted("ABAP_AS"); ABAP_AS_properties = null; } else { if(ABAP_AS_properties!=null && !ABAP_AS_properties.equals(properties)) eL.updated("ABAP_AS"); ABAP_AS_properties = properties; } } }
测试连接:
public static void main(String[] args) throws Exception { Properties connectProperties = new Properties(); connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "binmain"); connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, "53"); connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "000"); connectProperties.setProperty(DestinationDataProvider.JCO_USER, "JCOTEST"); connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "JCOTEST"); connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "en"); MyDestinationDataProvider myProvider = new MyDestinationDataProvider(); com.sap.conn.jco.ext.Environment.registerDestinationDataProvider(myProvider); myProvider.changePropertiesForABAP_AS(connectProperties); JCoDestination ABAP_AS = JCoDestinationManager.getDestination("ABAP_AS"); ABAP_AS.ping(); System.out.println("ABAP_AS destination is ok"); }