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Thursday, 28 August 2014

Create taskFlow and region binding at run-time , show n numbers of regions using multiTaskFlow- Oracle ADF

This is very specific development requirement to create taskFlow and region binding at run-time to show n numbers of region in page
In this case initially you don't know how much regions required in page as it depends on user activity .

you can see in http://irctc.co.in/ (Indian Railways) site
when user search for a train and check berth availability then a tab is generated at run-time with berth and fare details and it continues for each action , every time a new tab with new information is generated (n- number of tab and taskFlow)

A very good article is published in Oracle Magazine (July – August 2014) by Frank Nimphius on this requirement , article contains very good description of each and every step and a sample application with whole functionality
I found it very interesting and good so giving a quick overview of TaskFlow on Fly

this functionality is implemented using multiTaskFlow element that uses taskFlow binding from managed bean , taskFlow bindings in managed bean created using TaskFlowBindingAttributes
this class is used to set all properties of taskFlow binding at runtime



See Oracle docs (TaskFlowBindingAttributes)-
Set of attributes that define a TaskFlowBinding object. The taskFlowList attribute of the multiTaskFlow element of the page definition uses a list of object of this type to describe each taskflowBinding that the multiTaskflow binding contains. The order of this list defines the order of the region objects in the multiTaskflow binding. 

So in this post i am using Departments and Employees table of HR Schema(Oracle) to create business components for Model part


Create viewCriteria in both viewObjects (Departments and Employees) to filter data using DepartmentId




Applied viewCriteria to viewObject at AM level (Edit Vo instance and shuttle viewCriteria to selected side)
After this created methods in AMImpl class to set value in both viewCriteria's bind variables


    /**Method to filter Department ViewObject
     * @param deptId
     */
    public void filterDepartmentData(Integer deptId) {
        this.getDepartments1().setNamedWhereClauseParam("BindDeptId", deptId);
        this.getDepartments1().executeQuery();

    }

    /**Method to filter Employees Data
     * @param deptId
     */
    public void filterEmployeesData(Integer deptId) {
        this.getEmployees1().setNamedWhereClauseParam("BindDeptId", deptId);
        this.getEmployees1().executeQuery();

    }

Expose both methods to use in clientInterface

Now viewController part-

Created two bounded taskFlow with one input parameter for DepartmentId (this id will be used to filter Departments and Employess viewObject)
One for Departments and Second for Employees-

First taskFlow has a .jsff (facelets) page that has Departments viewObject as a form , just to show date with navigation buttons
filterDepartmentData method of AMImpl is used as Default Activity of this taskFlow
to filter data before entering in page
 
 
 

Second taskFlow has a .jsff (facelets) page that has Employees viewObject as a table
filterEmployeesData method of AMImpl is used as Default Activity of this taskFlow
to filter data before entering in page



Now basic configuration is complete, model is ready and bounded taskFlows are ready
then create a jsf page and manged bean (pageFlowScope) in adfc-config.xml, this page will make use of these two bounded taskFlows  and managed bean is responsible to generate taskFlow binding at runtime

Next Step is to prepare manged bean to hold taskFlowBinding-
Create a List of type TaskFlowBindingAttributes and it's accessors


import oracle.adf.controller.binding.TaskFlowBindingAttributes;    
private List<TaskFlowBindingAttributes> taskFlowBinding = new ArrayList<TaskFlowBindingAttributes>(5);

    public void setTaskFlowBinding(List<TaskFlowBindingAttributes> taskFlowBinding) {
        this.taskFlowBinding = taskFlowBinding;
    }

    public List<TaskFlowBindingAttributes> getTaskFlowBinding() {
        return taskFlowBinding;
    }

Create multiTaskFlow binding in executables of pgae-

  • Open jsf page, click on bindings tab of page editor
  • click on green plus icon of executables section
  • Select ADF TaskFlow Bindings in category and select multiTaskFlow


  • click on ok and provide an unique value for id attribute and reference of List created in managed bean as value for taskFlowList attribute


  • Configuration of  multiTaskFlow for this page is complete and now time to design page to render multiple regions. For this purpose add af:ForEach and a region inside it, forEach is responsible to add regions at run-time. here a little change i am using panelTabbed  to create tab at runtime and inside tab there will be region 
  • See this xml code- here nothing simple panelTabbed and forEach iterates over to list to identify number of items and varStatus of forEach is used to create id of showDetailItem at runtime as id must be unique. regionModel is referenced from var attributes of forEach as part of taskFlowBinding 

  •  <af:panelTabbed position="above" id="pt1" partialTriggers="b1">
                <af:forEach items="#{bindings.mtf1.taskFlowBindingList}" var="multiTF" varStatus="vs">
                   <af:showDetailItem id="Tab#{vs.index+1}" text="#{multiTF.name}" partialTriggers="b1">
                      <af:region value="#{multiTF.regionModel}" id="r1#{vs.index}" partialTriggers="::b1"/>
                   </af:showDetailItem>
                </af:forEach>
             </af:panelTabbed>
    

  • Now page is ready to show unknown (n) number of regions, here i am using two list and a button on page First List is of all departments and second one is static list to select information type (if user want to see Only Departments or Departments Wise Employees) and button to execute and add taskFlow from managed bean as per selected Department and 
  • Again a map is created in managed bean to store input parameters for taskFlow and it will used while setting and creating taskFlowBinding

  •     HashMap<String, Object> tfParam = new HashMap<String, Object>();
        public void setTfParam(HashMap<String, Object> tfParam) {
            this.tfParam = tfParam;
        }
    
        public HashMap<String, Object> getTfParam() {
            return tfParam;
        }
    

  • finally we will create taskFlow binding and set properties on button click (actionEvent of button), See this code-

  •     /**Method to create and set properties in TaskFlowBinding
         * @param actionEvent
         */
        public void displayDepartmentAction(ActionEvent actionEvent) {
            //Clear List to show newly created regions only
            taskFlowBinding.clear();
            System.out.println("List Cleared -Size>" + taskFlowBinding.size());
            //Check that user selects value in both List (Uses component binding to check)
            if (deptIdBindVal.getValue() != null && showTypeBind.getValue() != null) {
                //Put value in TaskFLow Parameter map, deptIdBindVal is binding of list of departments on page
                tfParam.put("DeptIdParam", deptIdBindVal.getValue());
    
                //Only Shows Departments taskFlow, if user selectes "Only Departments"
                if ("Only Departments".equalsIgnoreCase(showTypeBind.getValue().toString())) {
                    //Setting taskFlow properties
                    TaskFlowBindingAttributes tfAttr = new TaskFlowBindingAttributes();
                    //Creating Unique Id
                    tfAttr.setId("Department_" + deptIdBindVal.getValue());
                    //See bounded taskFlow name in WEB-INF and use here
                    tfAttr.setTaskFlowId(new TaskFlowId("/WEB-INF/DepartmentsBTF.xml", "DepartmentsBTF"));
                    //This EL refers parameter map created in this managedBean
                    tfAttr.setParametersMap("#{pageFlowScope.MultiTaskFlowBean.tfParam}");
                    //Finally add taskFlow to List
                    taskFlowBinding.add(tfAttr);
                } else { // Show both Departments and Employees
                    //Creating Departments TaskFlow binding
                    TaskFlowBindingAttributes tfAttr = new TaskFlowBindingAttributes();
                    tfAttr.setId("Department_" + deptIdBindVal.getValue());
                    tfAttr.setTaskFlowId(new TaskFlowId("/WEB-INF/DepartmentsBTF.xml", "DepartmentsBTF"));
                    tfAttr.setParametersMap("#{pageFlowScope.MultiTaskFlowBean.tfParam}");
                    taskFlowBinding.add(tfAttr);
                    //Creating Employee TaskFlow biniding
                    tfAttr = new TaskFlowBindingAttributes();
                    tfAttr.setId("Employees_" + deptIdBindVal.getValue());
                    tfAttr.setTaskFlowId(new TaskFlowId("/WEB-INF/EmployeesBTF.xml", "EmployeesBTF"));
                    tfAttr.setParametersMap("#{pageFlowScope.MultiTaskFlowBean.tfParam}");
                    taskFlowBinding.add(tfAttr);
                }
            }
        }
    

  • So Application with multiTaskFlow is ready , in this post i have used these two bounded taskFlow to show in two tabs at run-time, in same way you can call multiple TFs or a single taskFlow multiple time. Now runt application and see how it works

Initial page with two lists


Select Department and show type -click on button


Select Department and show type -click on button


  • Refer this post Region Extreme: Multi-Task-Flow Binding to learn more about multiTaskFlow binding. In this Frank also told about how to use dynamic viewObject instance to show different data at run-time, because if we use same instance of viewObject in multiple taskFlow at same time then it will not maintain state for each region to it is necessary to use dynamic instance and it's binding in pageDef
  • Read more about regions and taskFlows- Using Task Flows as Regions
Thanks - Happy Learning :) Sample ADF Application

Monday, 25 August 2014

Using HashMap in EL expression to set component properties in Oracle ADF

Basic requirement while using EL on pages in ADF, we use bean variables, binding attributes, iterators in expression to check conditions , to set properties for components as Enable-Disable, Visible, inline style etc.
in the same way we can use collections (Array, HashMap) in expression, i know it is pretty simple but have seen many thread in OTN asking how to use HashMap in expression

So here i am taking a very simple example



I have 5 input text on page and i have to enable-disable some fields based on it's id value, there is two buttons on page


as you can see on click of first button , input field 1,3 and 5 should be disabled and on click of second button af:inputText 2 and 4 should be disabled
so for this purpose i have used a HashMap in managed bean


    private HashMap fieldVal = new HashMap();

    public void setFieldVal(HashMap fieldVal) {
        this.fieldVal = fieldVal;
    }

    public HashMap getFieldVal() {
        return fieldVal;
    }

values in HashMap are populated using id value of inputTexts on page as key, this id will be passed as parameter in HashMap in expression
see how expression used in disabled property of inputText-


in same way expression for all inputText is set


<af:panelFormLayout id="pfl1" partialTriggers="b1 b2">
                    <af:inputText label="Label 1" id="it1" disabled="#{EnableDisableBean.fieldVal['it1']}"/>
                    <af:inputText label="Label 2" id="it2"
                                  disabled="#{requestScope.EnableDisableBean.fieldVal['it2']}"/>
                    <af:inputText label="Label 3" id="it3"
                                  disabled="#{requestScope.EnableDisableBean.fieldVal['it3']}"/>
                    <af:inputText label="Label 4" id="it4"
                                  disabled="#{requestScope.EnableDisableBean.fieldVal['it4']}"/>
                    <af:inputText label="Label 5" id="it5" autoSubmit="true"
                                  disabled="#{requestScope.EnableDisableBean.fieldVal['it5']}"/>
                </af:panelFormLayout>

now see code on buttons, simply setting values against key


    /**Method to disable inputText (1,3,5) on basis of id value
     * @param actionEvent
     */
    public void disable135Action(ActionEvent actionEvent) {
        fieldVal.put("it1", true);
        fieldVal.put("it2", false);
        fieldVal.put("it3", true);
        fieldVal.put("it4", false);
        fieldVal.put("it5", true);

    }

    /**Method to disable inputText (2,4) on basis of id value
     * @param actionEvent
     */
    public void disable24Action(ActionEvent actionEvent) {
        fieldVal.put("it1", false);
        fieldVal.put("it2", true);
        fieldVal.put("it3", false);
        fieldVal.put("it4", true);
        fieldVal.put("it5", false);
    }

Run Application and see what is on page
On Click of First Button

On Click of Second Button

Thanks
Happy learning :)

Saturday, 23 August 2014

Access BindingContainer (Page Bindings) of another page using DataBindings.cpx in Oracle ADF

Hello all
this post is about a requirement of getting page binding of another page that is not active currently
we use BindingContainer to access bindings of current page, region in managed bean

Oracle Docs says-
The BindingContainer contains the Control Bindings for a reusable unit of View technology. For example, each individual Page, Region, or Panel refers to a unique BindingContainer with a set of Control Bindings that refer to the Model elements used by that Page. The BindingContainer interface is implemented by the data binding framework provider. 

So to access operations, methods exposed in client, listBinding, IteratorBinding we need to get BindingContainer of current viewPort (a page or a page fragment)
this method is used to get BindingContainer -


import oracle.adf.model.BindingContext;
import oracle.binding.BindingContainer;

    /*****Generic Method to get BindingContainer of current page, fragment or region**/
    public BindingContainer getBindingsCont() {
        return BindingContext.getCurrent().getCurrentBindingsEntry();
    }

as previously mentioned that BindingContainer contains bindings of current page but sometimes we need to access BindingContainer of any other page in order to access it's operations , iterators



So how to do this ?

for this i have created a 2 page fragments inside a bounded taskFlow



firstPage is very simple , it has only one button and secodPage has Departments (HR Schema ) viewObject as form

First Page Second Page

then i added createInsert operation in secodPage binidng, so here is the pageDef of secondPage
as there is no bindings on firstPage so there is no pageDef file is generated for that



now what i want to do is to call createInsert operation of Departments viewObject from firstPage, but there is no binding of operation in firstPage so if i use
BindingContext.getCurrent().getCurrentBindingsEntry()
to get BindingContainer then it will throw NullPointerException on calling createInsert

Now i have to get BindingContainer of secondPage -
Go to DataBindings.cpx file and see usageId for second page



Copy page usageId from there


pass this usageId in this method to get BindingContainer of secondPage


    /**
     * @param data
     * @return
     */
    public Object resolvEl(String data) {
        FacesContext fc = FacesContext.getCurrentInstance();
        Application app = fc.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();
        ELContext elContext = fc.getELContext();
        ValueExpression valueExp = elFactory.createValueExpression(elContext, data, Object.class);
        Object Message = valueExp.getValue(elContext);
        return Message;
    }
    
    /**Method to get BindingContainer of Another page ,pageUsageId is the usageId of page defined in DataBindings.cpx file
     * @param pageUsageId
     * @return
     */
    public BindingContainer getBindingsContOfOtherPage(String pageUsageId) {
        return (BindingContainer) resolvEl("#{data." + pageUsageId + "}");
    }

then call createInsert operation using this BindingContainer


 getBindingsContOfOtherPage("binidngs_view_secondPagePageDef").getOperationBinding("CreateInsert").execute();

Happy Learning Cheers :)

Friday, 15 August 2014

How to change default icons (info, Error, Warning) of FacesMessage and af:messages in Oracle ADF

Hello all
this post is about customizing or changing default icons of FacesMessage , it is very basic but sometimes it's hard to do easy things
if we need to use alternate icons in af:messages or in programmatic FacesMessage, so to do this just create a small ,simple CSS file (ADF Skin) in viewController project and use this code

Change url as per your icon image path, you can also define same for Fatal Error and Confirmation icon also




af|messages::info-icon
{
  content: url("../../information.png"); 
}

af|messages::warning-icon
{
  content: url("../../warning.png"); 
}
af|messages::error-icon
{
  content: url("../../error.png"); 
}

apply this skin to project and run your application to see changes

Default Icon Changed Icon

Happy Learning :)

Wednesday, 13 August 2014

Use View Link Accessor to call aggregate functions, set attribute value , set bind variables value (Oracle ADF)


Hello All

This post is about various usage of view link accessor  , when we create viewLink between two viewObjects , destination accessor is created by default in master viewObject, there is check box to create source accessor also at same time

We can use this view link accessor for calculating attribute's sum, setting value of attributes etc



here Departments is master viewObject and Employees is it's detail, after creating viewLink you can see in viewObject xml source there accessor is present

In Departments ViewObject- 




<ViewLinkAccessor
    Name="Employees"
    ViewLink="sample.model.view.link.DeptTOEmpVL"
    Type="oracle.jbo.RowIterator"
    IsUpdateable="false"/>

In EmployeesViewObject- 
 

<ViewLinkAccessor
    Name="Departments"
    ViewLink="sample.model.view.link.DeptTOEmpVL"
    Type="oracle.jbo.Row"
    Reversed="true"
    IsUpdateable="false"/>

So what is the use of these view link accessors ?
Master accessor in detail viewObject returns current Row of master viewObject, when you generate RowImpl class for detail viewObject , it also has a method for this accessor


    /**
     * Gets the associated <code>Row</code> using master-detail link Departments.
     */
    public Row getDepartments() {
        return (Row) getAttributeInternal(DEPARTMENTS);
    }

    /**
     * Sets the master-detail link Departments between this object and <code>value</code>.
     */
    public void setDepartments(Row value) {
        setAttributeInternal(DEPARTMENTS, value);
    }

Detail accessor in master viewObject returns a row set of all row of details viewObject that are currently referenced by master record

    /**
     * Gets the associated <code>RowIterator</code> using master-detail link Employees.
     */
    public RowIterator getEmployees() {
        return (RowIterator) getAttributeInternal(EMPLOYEES);
    }

Now see what we can do with viewLink Accessor

1. Get master attribute value in detail viewObject

suppose i have to get a attribute's value from Master viewObject (Departments) in a attribute of detail viewObject (Employee)
in this example i am getting managerId from Departments ViewObject so for this just write in expression of Employee's ManagerId field
viewLinkAccesorName.AttributeName


now run BC4J tester and check - create new record in Employee and see managerId from Departments is auto populated

 on creating new record-


2. Call aggregate function to calculate sum of an attribute of detail viewObject

suppose now i have to calculate total salary of a Department (sum of Employees salary of that department)
for this purpose just call sum function to calculate sum of all rows of detail RowSet 
take a transient attribute in Departments ViewObject and write in it's expression
viewLinkAccesorName.sum("AttributeName")


 Run ApplicationModule and see-


3. Set bind variable value as per master viewObject's attribute (pass value from master viewObject)

This  is tricky part as we can not set bind variable value through expression as it doesn't recognize view link accessor name.
created a viewCriteria and bind variable for managerId in Employee viewObject




applied this criteria to Employees viewObject instance in Application Module (Just Shuttle criteria to selected side)


now to set bind variable's value we have to override prepareRowSetForQuery method in Employees VOImpl class

this method gets the value of managerId from currentRow of master ViewObject (Departments)and sets in bind variable of Employees viewObject


    @Override
    public void prepareRowSetForQuery(ViewRowSetImpl viewRowSetImpl) {
        RowSetIterator[] masterRows = viewRowSetImpl.getMasterRowSetIterators();
        if (masterRows != null && masterRows.length > 0 && masterRows[0].getCurrentRow() != null &&
            masterRows[0].getCurrentRow().getAttribute("ManagerId") != null) {
            Integer managerId = (Integer) masterRows[0].getCurrentRow().getAttribute("ManagerId");
            viewRowSetImpl.ensureVariableManager().setVariableValue("BindManagerId", managerId);
            System.out.println("ManagerID in bind Var-" + managerId);

        }
        super.prepareRowSetForQuery(viewRowSetImpl);
    }

now run AM and check it-

Happy Learning :)

Monday, 4 August 2014

Uploading and downloading files from absolute server path in Oracle ADF (12.1.3)

Hello all
this post is about a very simple requirement -file handling (uploading and downloading various types of file) in ADF and it is needed very often to store file in absolute server path (actual path) and download from there

see step by step implementation -
  • I have created a simple table in HR schema to store uploaded file name ,path and content type
  • See sql script for this table-

     CREATE TABLE "FILE_UPD_DWN" 
       ( "FILE_NAME" VARCHAR2(50 BYTE), 
     "PATH" VARCHAR2(100 BYTE), 
     "CONTENT_TYPE" VARCHAR2(500 BYTE)
       )
    

  • Then prepare model using this table and drop on page as af:table, and an af:inputFile to select and upload file is used in page


  • Then create a ValueChangeListener on inputFile component to upload file to an actual path on server, and after upload a row is inserted in table to keep record of uploaded files

  • Bean Method to Upload File-


        /**Method to upload file to actual path on Server*/
        private String uploadFile(UploadedFile file) {
    
            UploadedFile myfile = file;
            String path = null;
            if (myfile == null) {
    
            } else {
                // All uploaded files will be stored in below path
                path = "D://FileStore//" + myfile.getFilename();
                InputStream inputStream = null;
                try {
                    FileOutputStream out = new FileOutputStream(path);
                    inputStream = myfile.getInputStream();
                    byte[] buffer = new byte[8192];
                    int bytesRead = 0;
                    while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
                        out.write(buffer, 0, bytesRead);
                    }
                    out.flush();
                    out.close();
                } catch (Exception ex) {
                    // handle exception
                    ex.printStackTrace();
                } finally {
                    try {
                        inputStream.close();
                    } catch (IOException e) {
                    }
                }
    
            }
            //Returns the path where file is stored
            return path;
        }
    

    AMImpl method to insert record in table for Uploaded file




        /**Method to set file path and name
         * @param name
         * @param path
         */
        public void setFileData(String name, String path,String contTyp) {
            ViewObject fileVo = this.getFileUpdDwn1();
            Row newRow = fileVo.createRow();
            newRow.setAttribute("FileName", name);
            newRow.setAttribute("Path", path);
            newRow.setAttribute("ContentType", contTyp);
            fileVo.insertRow(newRow);
            this.getDBTransaction().commit();
            fileVo.executeQuery();
        }
    

    ValueChangeListener to execute all methods -


        /*****Generic Method to Get BindingContainer**/
        public BindingContainer getBindingsCont() {
            return BindingContext.getCurrent().getCurrentBindingsEntry();
        }
    
        /**
         * Generic Method to execute operation
         * */
        public OperationBinding executeOperation(String operation) {
            OperationBinding createParam = getBindingsCont().getOperationBinding(operation);
            return createParam;
    
        }
    
        /**Method to Upload File ,called on ValueChangeEvent of inputFile
         * @param vce
         */
        public void uploadFileVCE(ValueChangeEvent vce) {
            if (vce.getNewValue() != null) {
                //Get File Object from VC Event
                UploadedFile fileVal = (UploadedFile) vce.getNewValue();
                //Upload File to path- Return actual server path
                String path = uploadFile(fileVal);
                System.out.println(fileVal.getContentType());
                //Method to insert data in table to keep track of uploaded files
                OperationBinding ob = executeOperation("setFileData");
                ob.getParamsMap().put("name", fileVal.getFilename());
                ob.getParamsMap().put("path", path);
                ob.getParamsMap().put("contTyp", fileVal.getContentType());
                ob.execute();
                // Reset inputFile component after upload
                ResetUtils.reset(vce.getComponent());
            }
        }
    

  • Now run application and select files and see- 


  • See uploaded files in folder


  • I have seen that developers often use servlet to download and open file in browser window using HTTP response , but no need to to do this as ADF provides built in component for this <af:fileDownloadActionListener> that automatically generate http response
  • Now Upload part is complete , for download functionality added a link in table column and dropped an af:fileDownloadActionListener inside link and set properties for DownloadActionListener



  • See the code in Download Listener

  •     /**Method to download file from actual path
         * @param facesContext
         * @param outputStream
         */
        public void downloadFileListener(FacesContext facesContext, OutputStream outputStream) throws IOException {
            //Read file from particular path, path bind is binding of table field that contains path
            File filed = new File(pathBind.getValue().toString());
            FileInputStream fis;
            byte[] b;
            try {
                fis = new FileInputStream(filed);
    
                int n;
                while ((n = fis.available()) > 0) {
                    b = new byte[n];
                    int result = fis.read(b);
                    outputStream.write(b, 0, b.length);
                    if (result == -1)
                        break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            outputStream.flush();
        }
    

  • Now run application and see how Upload and download works 

Happy Learning :) Sample ADF Application

Next Post is this series - (Must Read)
Uploading mulitiple files to server path in Oracle ADF using af:inputFile
Uploading and downloading files from database (BLOB) in Oracle ADF

Friday, 1 August 2014

Exporting viewObject data in text file using af:fileDownloadActionListener in Oracle ADF (12.1.3)

Hello All
This post is about using af:fileDownloadActionListener to generate file on run-time, suppose i have a viewObject and i want to export it's data in CSV or plain text so for this requirement we can generate file at run-time and send it to client UI to download

What is af:fileDownloadActionListener-
as per oracle docs-
The fileDownloadActionListener tag is a declarative way to allow an action source (<commandButton>, <commandLink>, etc.) to programatically send the contents of a file to the user, optionally with a specific content type and filename. Since file downloads must be processed with an ordinary request - not XMLHttp AJAX requests - this tag forces partialSubmit to be false on the parent component, if it supports that attribute.
The fileDownloadActionListener uses the native (browser built-in) filedownload popup, so this popup cannot be configured.

In this post i am using Departments table of HR schema



  • Prepare model part using Departments table and drop it on page as a table and add a button to UI for downloading


  • drop af:fileDownloadActionListener as child of button and set it's property as contentType, method , fileName 


  • Now see code written in download Listener-

  •     /**Method to get BindingsContainer for current page
         * @return
         */
        public BindingContainer getBindingsCont() {
            return BindingContext.getCurrent().getCurrentBindingsEntry();
        }
    
        /**Method to download ViewObject's data in plain text file
         * @param facesContext
         * @param outputStream
         * @throws UnsupportedEncodingException
         * @throws IOException
         */
        public void fileDownloadListener(FacesContext facesContext,
                                         OutputStream outputStream) throws UnsupportedEncodingException, IOException {
            OutputStreamWriter w = new OutputStreamWriter(outputStream, "UTF-8");
            //Get itertaor from bindings
            DCIteratorBinding deptIter = (DCIteratorBinding) getBindingsCont().get("Departments1Iterator");
            //Get ViewObject from Iterator
            ViewObjectImpl vo = (ViewObjectImpl) deptIter.getViewObject();
            ViewAttributeDefImpl[] attrDefs = vo.getViewAttributeDefImpls();
            int count = 0;
            RowSetIterator rsi = vo.createRowSetIterator(null);
            while (rsi.hasNext()) {
                Row nextRow = rsi.next();
                if (nextRow != null) {
                    // Code to iterate over ViewObject's column to get all columns value at runtime
                    for (ViewAttributeDefImpl attrDef : attrDefs) {
                        byte attrKind =
                            attrDefs[count].getAttributeKind(); //checks attribute kind for each element in an array of AttributeDefs
                        if (attrKind != AttributeDef.ATTR_ASSOCIATED_ROW &&
                            attrKind != AttributeDef.ATTR_ASSOCIATED_ROWITERATOR) {
                            String columnName = attrDef.getName();
                            w.write(columnName + " - " + nextRow.getAttribute(columnName) + "  ");
                        }
                    }
                    // Code to create new line text line for new Row
                    w.write(System.getProperty("line.separator"));
                }
            }
            //Flush the writer after wrting file
            w.flush();
        }
    }
    

  • Run this application and click on download button, browser download box appears , open downloaded file and see how your data appears in text file, to export data in a pdf file you have to generate PDF file using some API then you can download it in same way


Cheers:) Happy Learning