如何实现SAP的RFC函数调用(原创)

连接sap系统需要通过sap javaconnect来连接，对于sapjco.jar系列文件有32位与64位之分【32位用的JAR版本是 2.1.10 (2011-05-10) ，64位用的JAR版本是 2.1.7 (2006-06-12)】。即对jdk有严格要求。现说明客户端32位部署及服务端64位部署两种情况：

一、我本地是32位，部署本地客户端 sapjco32.zip
a) 将附件相对应位数的librfc32.dll、sapjcorfc.dll、msvcp71.dll、msvcr71.dll四个文件拷贝至system32，其中前两个文件是必须拷贝（后面2个可以不用）。
b) 将相对应位数的sapjco-2.1.7.jar拷贝至对应模块lib下，然后将其部署好。

这里我把它配置到我们的pom.xml里面了，如下：

首先把相应的JAR文件放在项目的WEB-INFlib目录下面。

2. 在pom.xml里面指向该文件。

<dependency>
<groupId>com.sap</groupId>
<artifactId>sapjco</artifactId>
<version>2.1.7</version>
<scope>system</scope>
<systemPath>${basedir}/src/main/webapp/WEB-INF/lib/sapjco-2.1.7.jar</systemPath>
</dependency>

二、服务器是64位 sapjco64.zip
a) 将附件相对应位数的librfc32.dll、sapjcorfc.dll、msvcp71.dll、msvcr71.dll四个文件拷贝至system32及SysWOW64文件夹下
b) 将相对应位数的sapjco-2.1.10.jar拷贝至服务端的lib下，然后将其部署好。同上。

<dependency>
<groupId>com.sap</groupId>
<artifactId>sapjco</artifactId>
<version>2.1.10</version>
<scope>system</scope>
<systemPath>${basedir}/src/main/webapp/WEB-INF/lib/sapjco-2.1.10.jar</systemPath>
</dependency>

如何在JAVA里面调用RFC函数，简单的demo如下：[详细的工具类 SapUtil.java]

package org.jeecgframework.core.util;

import com.sap.mw.jco.IFunctionTemplate;
import com.sap.mw.jco.JCO;
import com.sap.mw.jco.JCO.Structure;

public class SapUtil {
public static double getRate(String rateType, String fromCurrency, String toCurrency, String date) {
JCO.Client client = null;
double rate = 0;
try {
client = addClientPool();
JCO.Function func = getFunction(client, "BAPI_EXCHANGERATE_GETDETAIL");
JCO.ParameterList inputParameterList = func.getImportParameterList();
inputParameterList.getField("RATE_TYPE").setValue(rateType);
inputParameterList.getField("FROM_CURR").setValue(fromCurrency);
inputParameterList.getField("TO_CURRNCY").setValue(toCurrency);
inputParameterList.getField("DATE").setValue(date);
client.execute(func);
JCO.ParameterList outputParameterList = func.getExportParameterList();
Structure rateStructure = outputParameterList.getStructure("EXCH_RATE");
rate = rateStructure.getDouble("EXCH_RATE");
System.out.println(rate);
} catch (JCO.Exception e) {
e.printStackTrace();
} finally {
if (client != null) {
JCO.releaseClient(client);
}
}
return rate;
}

private static JCO.Client addClientPool() {
String client = "800";
String user = "crmuser1";
String password = "CRM1";
String language = "1";
String host = "10.10.1.80"; //正式机
String sysnr = "00";
JCO.Client sapclient = null;
try {
sapclient = JCO.createClient(client, user, password, language, host, sysnr);
sapclient.connect();
} catch (JCO.Exception e) {
throw new RuntimeException("SAP连接错误：" + e.getMessage());
}
return sapclient;
}

private static JCO.Function getFunction(JCO.Client client, String funcName) {
String repositoryName = "repository";
JCO.Function func = null;
try {
JCO.Repository repository = new JCO.Repository(repositoryName, client);
IFunctionTemplate ft = repository.getFunctionTemplate(funcName);
func = ft.getFunction();
} catch (JCO.Exception e) {
e.printStackTrace();
}
return func;
}

public static void main(String[] args) {
getRate("M", "USD", "CNY", "20141001");
getRate("M", "USD", "CNY", "00000000");
getRate("M", "EUR", "CNY", null);
getRate("M", "EUR", "CNY", "20141001");
}
}

PS：可能遇到的问题（都是32位和64位所用文件不一致问题）

java.lang.ExceptionInInitializerError: JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'JCO.nativeInit():
Could not initialize dynamic link library sapjcorfc [C:WindowsSystem32sapjcorfc.dll: Can't load AMD 64-bit .dll on a IA 32-bit platform].
java.lang.ExceptionInInitializerError: JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'JCO.nativeInit():
Could not initialize dynamic link library sapjcorfc. Found version "2.1.7 (2006-06-12)" but required version "2.1.10 (2011-05-10)".