Creating purchase orders using SAP Java Connector (JCo)

that allows us to communicate with SAP system using JAVA applications. The example included is of client-side programming, i.e. Java to SAP call. Here a Java application has been developed using Frame (a class in Java); this application uses classes in JCo to call a BAPI to create purchase order in the SAP system. I have not included many validations in the application, but neverthless, I guess this source code will prove to be an ice-breaker for you guys as far as using JCo is concerned. Note: Obviously, you need to have JCo class files in your class path!

import com.sap.mw.jco.*;
import java.util.*;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;


public class BAPITip extends Frame implements ActionListener
{
	
	//Global Declarations
	int i = 0;
	char flag = 'a';
	Label doc_type,co_code,purch_org,pur_group,vendor;
	Label po_item,pur_mat,plant,unit,net_price,deliv_date,quantity;
	
	TextField DOC_TYPE,CO_CODE,PURCH_ORG,PUR_GROUP,VENDOR;
	TextField PO_ITEM[],PUR_MAT[],PLANT[],UNIT[],NET_PRICE[],DELIV_DATE[],QUANTITY[];
	
	Panel pan_hdr,pan_itm,pan_bs,pan_st;
	Button bt = null,bc = null,br = null,bd = null;
	TextArea  status = null;
	
	JCO.Client mConnection = null;
	JCO.Pool pool = null;
	
	static final String POOL_NAME = "MyPool";
	static JCO.Repository mRepository;

	String msg = "";

		
	public BAPITip()
	{
		setLocation(0,0);
		setSize(800,800);
		setVisible(true);
		
		bt 		= 	new Button("Submit");
		bc 		= 	new Button("Connect");
		br 		= 	new Button("Reset");
		bd 		= 	new Button("Disconnect");
		
		bt.addActionListener(this);
		bc.addActionListener(this);
		br.addActionListener(this);
		bd.addActionListener(this);
		
		status	=	new TextArea("Status",4,30);
		status.setEditable(false);
		
	//Instantiating header labels
		doc_type 	= 	new Label("Document Type");
		co_code 	= 	new Label("Company Code");
		purch_org	= 	new Label("Purchasing Organization");
		pur_group	= 	new Label("Purchasing Group");
		vendor		= 	new Label("Vendor");
		
	//Instantiating line item labels
		po_item 	= 	new Label("     Item number");
		pur_mat 	= 	new Label("     Material");
		plant		= 	new Label("     Plant");
		unit		= 	new Label("     Unit");
		net_price	= 	new Label("     Net price");
		deliv_date	= 	new Label("     Delivery date");
		quantity	= 	new Label("     Quantity");
		
	//Instantiating header text fields
		DOC_TYPE 	= 	new TextField();
		CO_CODE 	= 	new TextField();
		PURCH_ORG 	= 	new TextField();
		PUR_GROUP 	= 	new TextField();
		VENDOR	 	= 	new TextField();
		
	//Instantiating line item textfields
		PO_ITEM		=	new TextField[5];
		PUR_MAT		=	new TextField[5];
		PLANT		=	new TextField[5];
		UNIT		=	new TextField[5];
		NET_PRICE	=	new TextField[5];
		DELIV_DATE	=	new TextField[5];
		QUANTITY	=	new TextField[5];
	
	//Instantiating panels
		pan_hdr 	= 	new Panel();
		pan_itm 	= 	new Panel();

		
	//Setting layout for applet and adding component-panels to applet
		setLayout(new GridLayout(4,1));

	//Setting layout for header panel and adding components
		GridLayout gl1 = new GridLayout(5,2);
		pan_hdr.setLayout(gl1);
		
		pan_hdr.add(doc_type);
		pan_hdr.add(DOC_TYPE);
		
		pan_hdr.add(co_code);
		pan_hdr.add(CO_CODE);
		
		pan_hdr.add(purch_org);
		pan_hdr.add(PURCH_ORG);
		
		pan_hdr.add(pur_group);
		pan_hdr.add(PUR_GROUP);
		
		pan_hdr.add(vendor);
		pan_hdr.add(VENDOR);
		
		add(pan_hdr);
		

	//Setting layout for line item panel and adding components
		GridLayout gl2 = new GridLayout(7,7);

		pan_itm.setLayout(gl2);				
		pan_itm.add(po_item);
		pan_itm.add(pur_mat);
		pan_itm.add(plant);
		pan_itm.add(unit);
		pan_itm.add(net_price);
		pan_itm.add(deliv_date);
		pan_itm.add(quantity);
	
		
		for(i = 0; i < 5; i++)
		{
			PO_ITEM[i] 		= 	new TextField();
			PUR_MAT[i] 		= 	new TextField();
			PLANT[i] 		= 	new TextField();
			UNIT[i] 		= 	new TextField();
			NET_PRICE[i]	= 	new TextField();
			DELIV_DATE[i]	= 	new TextField();
			QUANTITY[i]		= 	new TextField();
			
			pan_itm.add(PO_ITEM[i]);
			pan_itm.add(PUR_MAT[i]);
			pan_itm.add(PLANT[i]);
			pan_itm.add(UNIT[i]);
			pan_itm.add(NET_PRICE[i]);
			pan_itm.add(DELIV_DATE[i]);
			pan_itm.add(QUANTITY[i]);
		}


		pan_itm.add(bc);
		pan_itm.add(bt);
		pan_itm.add(br);
		pan_itm.add(bd);

		add(pan_itm);
		add(status);

	}
	
	public void actionPerformed(ActionEvent ae)
	{
		msg = "";
		if (ae.getSource() == bt)
			this.submitToSAP();
		else if (ae.getSource() == bc)
			this.connectDirectToSAP();
		else if (ae.getSource() == br)
			this.resetValues();
		else if (ae.getSource() == bd)
			this.disconnectFromSAP();
	}
	
	
	
	private void connectDirectToSAP()
	{
  	// Change the logon information to your own system/user
		mConnection =
		JCO.createClient("210", // SAP client
		"DEV07", // userid
		"dra", // password
		"EN", // language (null for the default language)
		"10.111.16.26", // application server host name
		"00"); // system number

		try {
			mConnection.connect();
			msg = "Connection successfully established";
			this.setStatus();
			System.out.println("Connection successfully established");
		}
		catch (Exception ex) {
			msg = ex.getMessage();
			this.setStatus();
			System.exit(1);
		}
	}
	
	
	
	private void resetValues()
	{
		DOC_TYPE.setText("");
		PURCH_ORG.setText("");
		PUR_GROUP.setText("");
		CO_CODE.setText("");
		VENDOR.setText("");
		status.setText("");
		
		for (int i = 0; i < 5; i++)
		{
			PO_ITEM[i].setText("");
			PUR_MAT[i].setText("");
			PLANT[i].setText("");
			UNIT[i].setText("");
			NET_PRICE[i].setText("");
			DELIV_DATE[i].setText("");
			QUANTITY[i].setText("");
		}
	}
	
	
	
		
	private void submitToSAP()
	{
		msg = "Please wait...";
		this.setStatus();
		System.out.println("Please wait...");
		//creation of Repository object and object for the BAPI
			
			if(mConnection == null)
			{
				msg = "Please conect first to the SAP system";
				this.setStatus();
				System.out.println(msg);
				//System.exit(0);
			}
		mRepository = new JCO.Repository("ARAsoft", mConnection);
			
				JCO.Function function = null;
				function = BAPITip.createFunction("BAPI_PO_CREATE");
				
				
		//setting the import parameters
				JCO.Structure PO_HDR = function.getImportParameterList()
				.getStructure("PO_HEADER");
				
				JCO.Table PO_LITEMS = function.getTableParameterList().getTable("PO_ITEMS");
				
				JCO.Table PO_ITM_SCH = function.getTableParameterList().getTable("PO_ITEM_SCHEDULES");
				
				PO_HDR.setValue(DOC_TYPE.getText(),"DOC_TYPE");
				PO_HDR.setValue(CO_CODE.getText(),"CO_CODE");
				PO_HDR.setValue(PURCH_ORG.getText(),"PURCH_ORG");
				PO_HDR.setValue(PUR_GROUP.getText(),"PUR_GROUP");
				PO_HDR.setValue(VENDOR.getText(),"VENDOR");
				
				
				for(int i = 0; i < 5; i++)
				{
				
;
				if (PO_ITEM[i].getText() != "")
				{
				PO_LITEMS.appendRow();
				PO_LITEMS.setValue(PO_ITEM[i].getText(),"PO_ITEM");
				PO_LITEMS.setValue(PUR_MAT[i].getText(),"PUR_MAT");

				PO_LITEMS.setValue(PLANT[i].getText(),"PLANT");
				PO_LITEMS.setValue(UNIT[i].getText(),"UNIT");
				PO_LITEMS.setValue(NET_PRICE[i].getText(),"NET_PRICE");
				
				
				PO_ITM_SCH.appendRow();
				PO_ITM_SCH.setValue(PO_ITEM[i].getText(),"PO_ITEM");
				PO_ITM_SCH.setValue(new Date(),"DELIV_DATE");
				PO_ITM_SCH.setValue(QUANTITY[i].getText(),"QUANTITY");
				}
				
				}
				
		//executing the BAPI
				mConnection.execute(function);			
		
		//accessing export parameters
		
				JCO.Table returnTable =
				function.getTableParameterList().getTable("RETURN");
		
		if(returnTable.getNumRows() != 0)
		{
		for (int i = 0; i < returnTable.getNumRows(); i++) 
		{
				returnTable.setRow(i);
				if (! (returnTable.getString("TYPE").equals("") ||
				returnTable.getString("TYPE").equals("S") ||
				returnTable.getString("TYPE").equals("W")) ) 
				{
					if (i == 0)
						status.setText("");
						
					msg = returnTable.getString("MESSAGE");

						System.out.println(returnTable.getString("MESSAGE"));

				}
		}
	}
								
				String PO_NUM = function.getExportParameterList().
				getString("PURCHASEORDER");
				if (PO_NUM != null)
				{	
					flag = 'a';
					msg = "Purchase order " + PO_NUM + " created successfully!";
					this.setStatus();
					System.out.println(msg);

				}

	}	
	
	
	private void disconnectFromSAP()
	{
		mConnection.disconnect();
		msg = "Disconnected from SAP system...";
		this.setStatus();
		System.out.println("Disconnected from SAP system...");
	}
	
	
	public static JCO.Function createFunction(String name)
	{
		IFunctionTemplate ft =
		mRepository.getFunctionTemplate(name.toUpperCase());
		if (ft == null)
			return null;
		return ft.getFunction();
	
	}
	
	private void setStatus()
	{
		status.setText("");
		status.setText(msg);
	}
	
	
	
	private void appendStatus()
	{
		status.append(" " + msg);
	}
	
	
	
	public static void main(String args[])
	{
		BAPITip fb = new BAPITip();
	}