JCO連接SAP例子

?SAP JCo（SAP?Java?Connector，SAP?Java連接器）是SAP組件和Java應用程序之間的中間件和接口實現機制。
JCo基于JNI（Java Native Interface），建立在RFC協議基礎之上，支持SAP服務器端入站（JAVA調用ABAP）及出站（ABAP調用JAVA）數據通信。

使用JCo的機器中必須要安裝JRE（JAVA運行時環境）。
將從SAP官方服務站點下載的 JCO文件 sapjco3-ntintel-3.0.0.zip解壓，其中有連接組件（sapjco3.dll、sapjco3.jar）以及相關文檔和示例。

下面就用JCreator 做一個簡單的例子來測試JCO的功能：

1. 環境部署
?? 在D盤建立一個目錄lib，將sapjco3.dll、sapjco3.jar 拷貝到D:\lib下
?? 打開JCreator，打開菜單：配置--》選項，然后打開JDK配置文件，選中配置文件后點擊編輯，然后將D:\lib\sapjco3.jar添加到JDK配置文件的類清單中。

2.SAP端開發

SAP端用事務代碼SE37開發一個Function Module，支持RFC：

FUNCTION Z_BAPI_GET_ALL_USERS_DAILY.
*"----------------------------------------------------------------------
*"*"Local interface:
*"? IMPORTING
*"???? VALUE(USTYP) TYPE? XUUSTYP
*"? TABLES
*"????? USERS STRUCTURE? USR02
*"----------------------------------------------------------------------
TABLES:USR02.
DATA:ITAB_SAPUSERS TYPE TABLE of USR02 WITH HEADER LINE.

SELECT * INTO CORRESPONDING FIELDS OF TABLE ITAB_SAPUSERS
FROM USR02.

LOOP AT ITAB_SAPUSERS.
? users = ITAB_SAPUSERS.
? APPEND USERS.
ENDLOOP.

if ustyp is not INITIAL.
?? delete users
?????? where? ustyp <> ustyp.
endif.

ENDFUNCTION.

3.Java程序開發

用JCreator開發Java端程序：

1） 創建類User，封裝用戶的屬性

public class User {??
??? private String userId;??
??? private String name;??
??? private int age;?

??? public User(){}??
??? public User(String userId,String name,int age){??
??????? this.userId = userId;??
??????? this.name = name;??
??????? this.age = age;??
??? }?

??? public String getUserId() {??
??????? return userId;??
??? }?

??? public void setUserId(String userId) {??
??????? this.userId = userId;??
??? }?

??? public String getName() {??
??????? return name;??
??? }?

??? public void setName(String name) {??
??????? this.name = name;??
??? }?

??? public int getAge() {??
??????? return age;???
??? }?

??? public void setAge(int age) {??
??????? this.age = age;??
??? }??
}??

2） 創建ConnectSAPServer類，實現對連接池的管理

import java.io.File;
import java.io.FileOutputStream;
import java.util.Properties;?
import com.sap.conn.jco.JCoDestination;?
import com.sap.conn.jco.JCoDestinationManager;
import com.sap.conn.jco.JCoException;
import com.sap.conn.jco.ext.DestinationDataProvider;

public class ConnectSAPServer
{
?//SAP服務器IP地址?????
?static String D12 = "XXX.25.0.XX";????
?static String T11 = "XXX.25.0.XX";?????????
?static String ABAP_AS_POOLED = "ABAP_AS_WITH_POOL";??????
?static{??????
Properties connectProperties = new Properties();???????
connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, D12);??????????
connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR,? "00");??????? //系統編號?????????
connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "900");?????? //SAP集團???????
connectProperties.setProperty(DestinationDataProvider.JCO_USER,?? "baichi");?????? //SAP用戶名????????
connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "12345678");???? //密碼???????
connectProperties.setProperty(DestinationDataProvider.JCO_LANG,?? "ZH");??????? //登錄語言?????????
connectProperties.setProperty(DestinationDataProvider.JCO_POOL_CAPACITY, "3");? //最大連接數????????
connectProperties.setProperty(DestinationDataProvider.JCO_PEAK_LIMIT,"10");???? //最大連接線程?????????????
createDataFile(ABAP_AS_POOLED, "jcoDestination", connectProperties);????
?}???????

? //如果連接配置文件不存在，則創建一個配置文件，并把配置信息寫入到文件中
? static void createDataFile(String name, String suffix, Properties properties)
?{????
???? File cfg = new File(name+"."+suffix);???????
???? if(!cfg.exists()){????????????
????? try{???????????????
???????? FileOutputStream fos = new FileOutputStream(cfg, false);????????
???????? properties.store(fos, "for tests only !");??????????????
???????? fos.close();???????????
???????? }
catch (Exception e){??????????????
? throw new RuntimeException("Unable to create the destination file " + cfg.getName(), e);???
????????? }?????
??? }????
?}??
?????
public static JCoDestination Connect(){????
? JCoDestination destination =null;??????????
? try {????????????
??????? destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);???
????? }
? catch (JCoException e)?
????? {??
??????? e.getCause();?????
????? }????????????????
? return destination;???
? }?
??
? public static void main(String[] s)
? {
?? JCoDestination jcoConn = testJCO.Connect();
?? System.out.println(jcoConn.getDestinationName());
? }?
}

3） 創建一個類ConnectSAPTable，用于調用sap的function module

import java.util.ArrayList;??
import java.util.List;??
import com.sap.conn.jco.JCoDestination;??
import com.sap.conn.jco.JCoException;??
import com.sap.conn.jco.JCoFunction;??
import com.sap.conn.jco.JCoTable;??
//import User;??
public class ConnectSAPTable {???
??? private static JCoDestination jCoDestination;??
??? public static List<User> returnSAPUser_All(String ustyp) throws JCoException{??
??????? List<User> users = new ArrayList<User>();??
??????? jCoDestination = ConnectSAPServer.Connect();???
??????? JCoFunction function = jCoDestination.getRepository().getFunction("Z_BAPI_GET_ALL_USERS_DAILY");???
??????? if (function == null) throw new RuntimeException("Z_BAPI_GET_ALL_USERS_DAILY? not found in SAP.");??
??????? //傳入的參數?
??????? function.getImportParameterList().setValue("USTYP",ustyp);? // user type?
??????? function.execute(jCoDestination);??
??????? JCoTable returnTable = function.getTableParameterList().getTable("USERS");??
??????? if (returnTable.getNumRows()>0) {??
?????????? returnTable.firstRow();???
??????????? for (int i = 0; i < returnTable.getNumRows(); i++,returnTable.nextRow()) {??
??????????????? User user = new User();???
??????????????? user.setUserId(returnTable.getString("BNAME"));???
??????????????? users.add(user);??
??????????? }??
??????? }??
??????? return users;??
??? }??
}??

4） 創建一個類ExportSAPUserByDaily，用于調度，提供參數輸入并處理返回的結果

import java.util.List;????
import com.sap.conn.jco.JCoException;
//import User;
public class ExportSAPUserByDaily {??
??? public static void main(String[] args) {??
??????? System.out.println("the call result by JCo：");
??????? try {???
??????????? List<User> userList = ConnectSAPTable.returnSAPUser_All(args[0]);??
??????????? for (User sapUser : userList) {???
??????????????? System.out.println(sapUser.getUserId());??
??????????? }???
??????? } catch (JCoException e) {??
??????????? e.getCause();??
??????????? e.printStackTrace();
??????? }??
??? }??
}?

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