本文使用的例子源代碼在我的github上。

在我的公眾號文章在SAP云平臺的CloudFoundry環境下消費ABAP On-Premise OData服務介紹了如何通過Cloud Connector連接ABAP On-Premise系統。

我創建了三個service的實例，詳情如上圖和下表：

服務類型服務實例名稱

connectivity	connectivity-jerry-demo
destination	jerry-destination-lite
xsuaa	xsuaa-jerry-demo

這三個服務實例的名稱維護在應用的manifest.xml中。

將應用使用cf push部署到CloudFoundry之后，在Cockpit里能觀察到生成的系統變量VCAP_SERVICES:

在Java代碼里，使用如下代碼將該環境變量的值讀取出來存儲到字符串中。

private static final String VCAP_SERVICES = System.getenv("VCAP_SERVICES");

該Json對象的具體字段通過getJSONObject讀取出來。

下圖是connectivity實例的credentials明細：

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附錄

VCAP_SERVICES全部內容：

{"VCAP_SERVICES": {"xsuaa": [{"name": "xsuaa-jerry-demo","instance_name": "xsuaa-jerry-demo","binding_name": null,"credentials": {"uaadomain": "authentication.eu10.hana.ondemand.com","tenantmode": "dedicated","sburl": "https://internal-xsuaa.authentication.eu10.hana.ondemand.com","clientid": "sb-connectivity-jerry-demo!t3704","verificationkey": "-----BEGIN PUBLIC KEY-----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-----END PUBLIC KEY-----","xsappname": "connectivity-jerry-demo!t3704","identityzone": "jerry","identityzoneid": "f3bd7f84-ebf1-4c11-b7c7-a278ebd54dcb","clientsecret": "WAxzZxYQCgB7Dkml8dFdU+kaLSE=","tenantid": "f3bd7f84-ebf1-4c11-b7c7-a278ebd54dcb","url": "https://jerry.authentication.eu10.hana.ondemand.com"},"syslog_drain_url": null,"volume_mounts": [],"label": "xsuaa","provider": null,"plan": "application","tags": ["xsuaa"]}],"connectivity": [{"name": "connectivity-jerry-demo","instance_name": "connectivity-jerry-demo","binding_name": null,"credentials": {"uaadomain": "authentication.eu10.hana.ondemand.com","onpremise_proxy_port": "20003","tenantmode": "dedicated","clientid": "sb-clone5282c913c9164bb284239adcc4d74210!b3704|connectivity!b17","verificationkey": "-----BEGIN PUBLIC KEY-----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-----END PUBLIC KEY-----","xsappname": "clone5282c913c9164bb284239adcc4d74210!b3704|connectivity!b17","identityzone": "jerry","clientsecret": "nyiGD9QQSOZO+NTeEJdexWWjxYY=","tenantid": "f3bd7f84-ebf1-4c11-b7c7-a278ebd54dcb","url": "https://jerry.authentication.eu10.hana.ondemand.com","onpremise_proxy_host": "10.0.85.1"},"syslog_drain_url": null,"volume_mounts": [],"label": "connectivity","provider": null,"plan": "lite","tags": ["connectivity","conn","connsvc"]}],"destination": [{"name": "jerry-destination-lite","instance_name": "jerry-destination-lite","binding_name": null,"credentials": {"uaadomain": "authentication.eu10.hana.ondemand.com","tenantmode": "dedicated","clientid": "sb-clone39a01503ac1845fbbda5d5ffccb1a469!b3704|destination-xsappname!b404","instanceid": "39a01503-ac18-45fb-bda5-d5ffccb1a469","verificationkey": "-----BEGIN PUBLIC KEY-----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-----END PUBLIC KEY-----","xsappname": "clone39a01503ac1845fbbda5d5ffccb1a469!b3704|destination-xsappname!b404","identityzone": "jerry","clientsecret": "QCnO+2k8gvUkdTyiCZI5rhzylbQ=","tenantid": "f3bd7f84-ebf1-4c11-b7c7-a278ebd54dcb","uri": "https://destination-configuration.cfapps.eu10.hana.ondemand.com","url": "https://jerry.authentication.eu10.hana.ondemand.com"},"syslog_drain_url": null,"volume_mounts": [],"label": "destination","provider": null,"plan": "lite","tags": ["destination","document"]}],"application-logs": [{"name": "jerry-log","instance_name": "jerry-log","binding_name": null,"credentials": {},"syslog_drain_url": "https://10.0.104.16: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","volume_mounts": [],"label": "application-logs","provider": null,"plan": "lite","tags": []}]} } {"VCAP_APPLICATION": {"cf_api": "https://api.cf.eu10.hana.ondemand.com","limits": {"fds": 16384,"mem": 512,"disk": 1024},"application_name": "connectivity-jerry-demo","application_uris": ["connectivity-jerry-demo-i042416.cfapps.eu10.hana.ondemand.com"],"name": "connectivity-jerry-demo","space_name": "dev","space_id": "69abfd46-d228-4903-b245-de88ceff3642","uris": ["connectivity-jerry-demo-i042416.cfapps.eu10.hana.ondemand.com"],"users": null,"application_id": "fa893f26-69ee-4a4a-aa04-8f8ae0676475","version": "d964d7cc-e067-4810-b834-25c995fe1bc5","application_version": "d964d7cc-e067-4810-b834-25c995fe1bc5"} }

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