Java Connector(JCO)环境的搭建：Step by step to download and configure JCO in your laptop
我的ABAP系统有个函数名叫ZDIS_GET_UPSELL_MATERIALS，输入一个customer ID和product ID，会输出为这对客户和product组合维护的一组Upsell product ID和描述信息。
测试如下：

下面是使用Java消费该函数的代码：

package jco;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.JCoFunction;
import com.sap.conn.jco.JCoParameterList;
import com.sap.conn.jco.JCoRepository;
import com.sap.conn.jco.JCoTable;
import com.sap.conn.jco.ext.DestinationDataProvider;/*** basic examples for Java to ABAP communication  * See help: https://help.sap.com/saphelp_nwpi711/helpdata/en/48/70792c872c1b5ae10000000a42189c/frameset.htm*/
public class StepByStepClient
{static String DESTINATION_NAME = "ABAP_AS_WITHOUT_POOL";static public final String ABAP_DURATION = "abapLayerDuration";static public final String UPSELL_PRODUCT = "upsellProducts";static public final String PRODUCT_ID = "productID";static public final String PRODUCT_TEXT = "productText";static private Properties prepareProperty(){Properties connectProperties = new Properties();connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "ldcixcd.wdf.sap.corp");connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR,  "00");connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "111");connectProperties.setProperty(DestinationDataProvider.JCO_USER,   "WANGJER");connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "Saptest1");connectProperties.setProperty(DestinationDataProvider.JCO_LANG,   "en");createDestinationDataFile(DESTINATION_NAME, connectProperties);connectProperties.setProperty(DestinationDataProvider.JCO_POOL_CAPACITY, "3");connectProperties.setProperty(DestinationDataProvider.JCO_PEAK_LIMIT,    "10");createDestinationDataFile(DESTINATION_NAME, connectProperties);return connectProperties;}static public void main(String[] arg) {createDestinationDataFile(DESTINATION_NAME, prepareProperty());JCoDestination destination = null;try {destination = JCoDestinationManager.getDestination(DESTINATION_NAME);JCoRepository repo = destination.getRepository();JCoFunction stfcConnection = repo.getFunction("ZDIS_GET_UPSELL_MATERIALS");JCoParameterList imports = stfcConnection.getImportParameterList();String customerID = "1000040";String materialID = "11";imports.setValue("IV_CUSTOMER_ID", customerID);imports.setValue("IV_MATERIAL_ID", materialID);stfcConnection.execute(destination);JCoParameterList exports = stfcConnection.getExportParameterList();// int result = exports.getInt("EV_RESULT");int abapDuration = exports.getInt("EV_DURATION");StringBuilder sb = new StringBuilder();sb.append("{ \"" + ABAP_DURATION + "\": " + abapDuration + ",");sb.append("\"" + UPSELL_PRODUCT + "\":[");JCoTable codes = exports.getTable("ET_MATERIALS");int row = codes.getNumRows();System.out.println("Total rows: " + row);System.out.println("ABAP duration: " + abapDuration);for( int i = 0; i < row; i++){codes.setRow(i);System.out.println(codes.getString("MATERIAL_ID") + '\t' + codes.getString("MATERIAL_TEXT"));sb.append("{\"" + PRODUCT_ID + "\":" + codes.getString("MATERIAL_ID") + ","+ "\"" + PRODUCT_TEXT + "\":\"" + codes.getString("MATERIAL_TEXT") + "\"");if( i < row - 1){sb.append("},");}else{sb.append("}");}}sb.append("]}");System.out.println("Final json: " + sb.toString());} catch (JCoException e) {// TODO Auto-generated catch blocke.printStackTrace();}}static private void createDestinationDataFile(String destinationName, Properties connectProperties){File destCfg = new File(destinationName+".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);}}
}

为简单起见没有使用Google的gson库进行Json的序列化。
执行结果：

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