How to get and read uplaoded files

Question

Hi,
I need to design a view wherein I need to list the uploaded files in Webdynpro(Java) application, and also need to read file from server. the filetype is Microsoft excel.

Answer 1

Hi
First You have to download the jxl.jar file. You can get this file from the Below site
JExcelApi v2.6.4 (1747kbytes)
It will be in Compressed Fromat So Unzip it to get the Contents
After Unzipping The File You will get a Folder (jexcelapi/jxl.jar)
Now in NWDS open web dynpro explorer, Right Click Your Project, a popup menu will appear and in that click Properties
You will get window displaying your Project Properties
On Left Side of the window You Will Find "Java Build Path"
Click That "Java Build Path" and you will get 4 Tabs Showing ( Source,Projects,Libraries,Order and Export)
Click Libraries Tab
You will find options many options buttons
In that click the Button "Add External Jars"
You will get Window in order to fecth the jxl.jar file from the location you had stored
After selecting the jxl.jar i will get displayed and click ok
Now Open Navigator
Open Your Project
You will find Lib folder
Copy the jxl.jar to that lib folder
Note : You cannot Read the Content from the excel file directly
First You Have to copy that file to the Server,
And from the Server you can get the file absolute path
With the absolute path you can read the contents of the Excel file
You have to save the Excel file as .xls Format and Not as xlsx format i will not accept that...
You have Upload the Excel file from the Server Using the File Upload UI Element
This Coding will extract 3 columns from the Xls File
Coding
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import com.sap.fileupload.wdp.IPrivateFileUpload_View;
import com.sap.tc.webdynpro.services.sal.datatransport.api.IWDResource;
public void onActionUpload_File(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionUpload_File(ServerEvent)
    IPrivateFileUpload_View.IContextElement element1 = wdContext.currentContextElement();
    IWDResource resource = element1.getFileResource();
    element1.setFileName(resource.getResourceName());
    element1.setFileExtension(resource.getResourceType().getFileExtension());
    //@@end
public void onActionUpload_File_in_Server(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionUpload_File_in_Server(ServerEvent)
    InputStream text=null;
    int temp=0;
    try
         File file = new File(wdContext.currentContextElement().getFileResource().getResourceName().toString());
         FileOutputStream op = new FileOutputStream(file);
         if(wdContext.currentContextElement().getFileResource()!=null)
              text=wdContext.currentContextElement().getFileResource().read(false);
              while((temp=text.read())!=-1)
                   op.write(temp);                                      
         op.flush();
         op.close();
         path = file.getAbsolutePath();
         wdComponentAPI.getMessageManager().reportSuccess(path);
    catch(Exception e)
         e.printStackTrace();
    //@@end
public void onActionUpload_Data_into_Table(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionUpload_Data_into_Table(ServerEvent)
    try
          Workbook wb =Workbook.getWorkbook(new File(path));
          Sheet sh = wb.getSheet(0);
          //wdComponentAPI.getMessageManager().reportSuccess("Columns = "+sh.getColumns());
          //wdComponentAPI.getMessageManager().reportSuccess("Rows = "+sh.getRows());
          int columns = sh.getColumns();
          int rows = sh.getRows();
          int i=0;
         for(int j=1;j<=rows;j++)
                   ele=wdContext.nodeTable_Data().createTable_DataElement();
                   Cell c1 = sh.getCell(i,j);
                  ele.setTab_Name(c1.getContents());
                   Cell c2 = sh.getCell(i+1,j);
                   ele.setTab_Degree(c2.getContents());
                      Cell c3 = sh.getCell(i+2,j);
                   ele.setTab_Percentage(c3.getContents());
                   wdContext.nodeTable_Data().addElement(ele);
    catch(Exception ex)
         wdComponentAPI.getMessageManager().reportSuccess(ex.toString());
    //@@end
The following code section can be used for any Java code that is
not to be visible to other controllers/views or that contains constructs
currently not supported directly by Web Dynpro (such as inner classes or
member variables etc.). </p>
Note: The content of this section is in no way managed/controlled
by the Web Dynpro Designtime or the Web Dynpro Runtime.
  //@@begin others
  String path;
  IPrivateFileUpload_View.ITable_DataElement ele;
//@@end
make sure that the cardinality of the node i.e. upload node is 1:1