我正在开发一个 Java 应用程序,该应用程序需要从位于 SAP 表中的 SAP 系统获取数据。我尝试使用 SAP Java 连接器 3.X 将 SW 与 SAP 连接,但我遇到了目的地问题。
我使用了 SAP Java 连接器附带的代码示例。
public class CustomDestinationDataProvider {
static class MyDestinationDataProvider implements DestinationDataProvider {
private DestinationDataEventListener eL;
private HashMap<String, Properties> secureDBStorage = new HashMap<String, Properties>();
public Properties getDestinationProperties(String ABAP_AS) {
try {
//read the destination from DB
Properties p = secureDBStorage.get(ABAP_AS);
if(p!=null) {
//check if all is correct, for example
if(p.isEmpty())
throw new DataProviderException(DataProviderException.Reason.INVALID_CONFIGURATION, "destination configuration is incorrect", null);
return p;
}
return null;
} catch(RuntimeException re) {
throw new DataProviderException(DataProviderException.Reason.INTERNAL_ERROR, re);
}
}
//An implementation supporting events has to retain the eventListener instance provided
//by the JCo runtime. This listener instance shall be used to notify the JCo runtime
//about all changes in destination configurations.
public void setDestinationDataEventListener(DestinationDataEventListener eventListener) {
this.eL = eventListener;
}
public boolean supportsEvents() {
return true;
}
//implementation that saves the properties in a very secure way
void changeProperties(String ABAP_AS, Properties properties) {
synchronized(secureDBStorage) {
if(properties==null) {
if(secureDBStorage.remove(ABAP_AS)!=null)
eL.deleted(ABAP_AS);
} else {
secureDBStorage.put(ABAP_AS, properties);
eL.updated(ABAP_AS); // create or updated
}
}
}
} // end of MyDestinationDataProvider
//business logic
void executeCalls(String ABAP_AS) {
JCoDestination dest;
try {
dest = JCoDestinationManager.getDestination(ABAP_AS);
dest.ping();
System.out.println("Destination " + ABAP_AS + " works");
} catch(JCoException e) {
e.printStackTrace();
System.out.println("Execution on destination " + ABAP_AS + " failed");
}
}
static Properties getDestinationPropertiesFromUI() {
//adapt parameters in order to configure a valid destination
Properties connectProperties = new Properties();
connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "XXX");
connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, "XX");
connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "XXX");
connectProperties.setProperty(DestinationDataProvider.JCO_USER, "XXX");
connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "XXX");
connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "XX");
createDestinationDataFile(ABAP_AS, connectProperties);
return connectProperties;
}
static void createDestinationDataFile(String ABAP_AS, Properties connectProperties) {
File destCfg = new File(ABAP_AS + ".jcoDestination");
try {
FileOutputStream fos = new FileOutputStream(destCfg, false);
connectProperties.store(fos, "for tests only!");
fos.close();
} catch (Exception e) {
throw new RuntimeException("Unable to create the destination files", e);
}
}
}
这是我从 NetBeans 得到的错误消息:
目标 ABAP_AS_WITHOUT_POOL 工作在目标 ABAP_AS_WITHOUT_POOL 上执行失败 com.sap.conn.jco.JCoException:(106)JCO_ERROR_RESOURCE:com.sap.conn.jco.rt.DefaultDestinationManager.update(DefaultDestinationManager.java:217) 中不存在目标 ABAP_AS_WITHOUT_POOL com.sap.conn.jco.rt.DefaultDestinationManager.searchDestination(DefaultDestinationManager.java:382) 在 com.sap.conn.jco.rt.DefaultDestinationManager.getDestinationInstance(DefaultDestinationManager.java:100) 在 com.sap.conn.jco。 JCoDestinationManager.getDestination(JCoDestinationManager.java:104) 在 jcotest2.CustomDestinationDataProvider.executeCalls(CustomDestinationDataProvider.java:92) 在 jcotest2.Main.main(Main.java:39)
构建成功(总时间:2 秒)