使用Java connector消费ABAP系统的函数

摘要：环境的搭建我的系统有个函数名叫，输入一个和，会输出为这对客户和组合维护的一组和描述信息。测试如下下面是使用消费该函数的代码为简单起见没有使用的库进行的序列化。

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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