enterprise java beans in interactive forms.pdf

5/19/2018 Enterprise Java Beans in Interactive Forms.pdf

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Enterprise Java Beans in InteractiveForms

SDN Community Contribution

(This is not an offi cial SAP document.)

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2005 SAP AG The SAP Developer Network: http://sdn.sap.com 1


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Appl ies To:

SAP Technology, SAP Web AS 7.00, Adobe Interactive Forms

Summary

This article explains how to access an Enterprise Java Beans (EJB) from an Interactive Form (Adobe PDF)used in a Web Dynpro application.

By : Sangeeta Bhandari

Company: SAP Labs India Pvt. Ltd.

Date: 06 Sep 2005

Table of Contents

Applies To:........................................................................................................................................2

Summary ..........................................................................................................................................2

Table of Contents .............................................................................................................................2

Prerequisite ......................................................................................................................................2

10-Step How-to.................................................................................................................................3

Author Bio.......................................................................................................................................11

Prerequisite

This project uses the sample Quick Car Rental Application. This project has an EJB called"QuickOrderProcessorBean" that has three methods:

viewActiveBookings(),

saveBooking()

cancelBooking()

We will be calling each of these methods from our Web Dynpro application, take input, and display the outputin the Interactive Form.



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10-Step How-to

1. Create a new Web Dynpro Project with an Interactive Form.

2. To resolve bean classes at design time: Add a project reference to HelperClasses andQuickCarRentalEJB to the Java Build Path in Project Properties.

3. To resolve bean classes at runtime: Add a sharing reference namedsap.com/QuickCarRentalApplication to the Web Dynpro Reference in the project properties.

4. Context: Create the following context nodes and attributes.



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The attribute pdfSource should have the data type binary. All other attributes should be of data typestring. The properties of the Interactive Form are dataSource=booking, pdfSource=pdfSource.

5. Initialization: In the wdDoInit() of the view say, EJBView, add the following lines:

I Pr i vat eEJ BVi ew. I Booki ngNode bNode = wdCont ext . nodeBooki ng( ) ;

for ( int i = 0; i < 1; i ++) { I Pri vat eEJ BVi ew. I Booki ngEl ementbEl e = bNode. cr eat eBooki ngEl ement ( ) ;

bEl e. set I d(" " ) ;

bEl e. set Vehi cl eType( "" ) ;

bEl e. set Pi ckupLocat i on( "" ) ;

bEl e. set Dr opof f Locat i on( "" ) ;

bEl e. set Dat eFrom( "" ) ;

bEl e. set Dat eTo( "" ) ;



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bEl e. set Pr i ce( "") ;

bNode. addEl ement ( bEl e) ;

}

try {

I ni t i al Cont ext ctx = new I ni t i al Context ( ) ;

Qui ckOr der Pr ocessorLocal Home l ocal Home =

( Qui ckOr derPr ocessor Local Home) ct x. l ookup(

"l ocal ej bs/ sap. com/ Qui ckCar Rent al Appl i cat i on/ Qui ckOr der Processor Bean") ;

Qui ckOr der ProcessorLocal l ocal = l ocal Home. cr eat e( ) ;

Qui ckBooki ngModel [ ] r esul t = l ocal . vi ewAct i veBooki ngs( ) ;

f or mat Booki ngs( r esul t ) ;

} catch ( Except i on e) {

wdComponentAPI . get MessageManager ( ) . r epor t Except i on(

"except i on i s : " + e. t oSt r i ng( ) ,true) ;

e. pr i nt St ackTr ace( ) ;

}

I Pr i vat eEJ BVi ew. I Booki ngNode bNode1 = wdCont ext . nodeBooki ng( ) ;

for ( int j = 0; j < Const ant s. LOCATI ON. l engt h; j ++)

{

I Pr i vat eEJ BVi ew. I Booki ngEl ement bEl e1 = bNode. cr eat eBooki ngEl ement ( ) ;

bEl e1. set Dr opof f Locat i on( Const ant s. LOCATI ON[ j ] ) ;

bEl e1. set Pi ckupLocat i on( Const ant s. LOCATI ON[ j ] ) ;

bNode1. addEl ement ( bEl e1) ;



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}

6. Calling method viewActiveBookings() actually implementing some part of it.

private void f ormatBooki ngs( Qui ckBooki ngModel [ ] booki ngs) {

Dat eFormat dat eFormat = Dat eFormat . get Dat eI nst ance( Dat eFormat . MEDI UM) ;

I Pr i vat eEJ BVi ew. I DataNode dNode = wdCont ext . nodeData( ) ;

for ( int i = 0; i < booki ngs. l engt h; i ++) {

I Pri vat eEJ BVi ew. I Dat aEl ement dEl e =

dNode. cr eat eDataEl ement ( ) ;

dEl e. set I d( booki ngs[ i ] . get Booki ngI d( ) ) ;

dEl e. set Vehi cl eType( booki ngs[ i ] . get Vehi cl eType( ) ) ;

dEl e. set Pi ckupLocat i on( booki ngs[ i ] . get Pi ckupLocat i on( ) ) ;

dEl e. set Dr opof f Locat i on( booki ngs[ i ] . get Dr opof f Locat i on( ) ) ;

dEl e. set Dat eFrom( booki ngs[ i ] . get Dat eFrom( ) ) ;

dEl e. set Dat eTo( booki ngs[ i ] . get Dat eTo( ) ) ;

dEl e. set Pr i ce( booki ngs[i ] . get Pr i ce( ) ) ;

dNode. addEl ement ( dEl e) ;

}

7. In the Adobe LiveCycle Designer:

a. Click Edit from the context menu of the Interactive Form.b. Drag and Drop a Subform from the Standard Library.c. Set its type to Flow Content and the Flow Direction to Table on the Object tab.d. Insert another subform in the above subform, and set its type to Flow Content and the Flow

Direction to Table Row.e. On the binding tab for this subform, check the checkbox for "Repeat subform for each Data

Item", and in Min Count you can specify at a time how many rows you want to display.

f. Now place your UI elements for the Data View into this subform.g. Format these UI elements as required. Set the default binding on the Object tab.

8. Calling method saveBooking():

The above table will display the existing Reservations. Now add a new subform for addingreservations. Bind the UI elements with the attributes of the Booking context node. Add a Submit toSAP button, and in its event handler add the following code:



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try {



( Qui ckOr derPr ocessor Local Home) ct x. l ookup(



l ocal . saveBooki ng(

wdCont ext . cur r ent Booki ngEl ement ( ) . getVehi cl eType( ) ,

wdCont ext . curr ent Booki ngEl ement ( ) . getDateFr om( ) ,

wdCont ext . cur r ent Booki ngEl ement ( ) . getDat eTo( ) ,

wdCont ext . cur r ent Booki ngEl ement ( ) . getPi ckupLocat i on( ) ,

wdCont ext. cur r ent Booki ngEl ement ( ) . get Dr opof f Locat i on( ) ) ;





}

wdCont ext . nodeDat a( ) . i nval i dat e( ) ;

try {



( Qui ckOr derPr ocessor Local Home) ct x. l ookup("l ocal ej bs/ sap. com/ Qui ckCar Rent al Appl i cat i on/ Qui ckOr der Processor Bean") ;


Qui ckBooki ngModel [ ] r esul t = l ocal . vi ewAct i veBooki ngs( ) ;



wdComponent API . getMessageManager( ) . r eport Except i on( "except i on i s: " + e. t oSt r i ng( ) ,true) ;



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}

wdCont ext . cur r ent Booki ngEl ement ( ) . set I d( "" ) ;

wdCont ext . cur r ent Booki ngEl ement ( ) . setVehi cl eType( "" ) ;

wdCont ext . cur r ent Booki ngEl ement ( ) . set Pi ckupLocat i on( "" ) ;

wdCont ext . cur r ent Booki ngEl ement ( ) . set Dr opof f Locat i on( "" ) ;

wdCont ext . cur r ent Booki ngEl ement ( ) . setDat eFrom( "" ) ;

wdCont ext . cur r ent Booki ngEl ement ( ) . setDat eTo( "" ) ;

wdCont ext . cur r ent Booki ngEl ement ( ) . set Pri ce( "" ) ;

9. Calling method cancelBooking(): Add a checkbox for a table row and bind it to the checkDeleteattribute of the data context node. Add a Check Fields button to Cancel Reservations. In its eventhandler, add the following code:

St r i ng s="Check ";

I Pr i vat eEJ BVi ew. I DataNode dNode = wdCont ext . nodeDat a( ) ;

try {



( Qui ckOr derProcessor Local Home) ct x. l ookup(



for ( int i = 0; i < dNode. si ze( ) ; i ++) {

I WDNodeEl ement e=dNode. get El ement At ( i ) ;

St r i ng s1=( St r i ng) e. get At t r i but eVal ue( "checkDel et e") ;

if (s1!=null&&s1. equal s( "1") )

{

s=s+s1+"( "+( St r i ng) e. get At t r i but eVal ue( " i d") +") ";

l ocal . cancel Booki ng( ( St r i ng) e. get At t r i but eVal ue( "i d") ) ;



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}

else

s=s+"0";

}





}

wdCont ext. nodeDat a( ) . i nval i dat e( ) ;

try {



( Qui ckOr derProcessor Local Home) ct x. l ookup(


Qui ckOr der ProcessorLocal l ocal = l ocal Home. cr eat e( ) ;Qui ckBooki ngModel [ ] r esul t = l ocal . vi ewAct i veBooki ngs( ) ;



wdComponentAPI . get MessageManager( ) . r epor t Except i on(

"except i on i s : " + e. t oSt r i ng( ) ,

true) ;


}

10. Build, Deploy, and Run the application.

Screenshot of the QuickCarRental application:



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Screenshot of the QuickCarRental Application inside an Interactive Form in Web Dynpro.



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Author Bio

Sangeeta Bhandari has been working as a QM Specialist in NetWeaver Operations Teams in SAP LabsIndia, Bangalore since June, 2005. She has also worked with the same team for 1 year as an intern whilestudying. She has been working with Web Services, Interactive Forms based on Adobe software, WebDynpro, J2EE with SAP NetWeaver Developer Studio. She is also working with Enterprise Portal.


enterprise java beans in interactive forms.pdf

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