使用Java connector消费ABAP系统的函数

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") + '	' + 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 block
			e.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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