How to update an Excel Sheet through a WebService

Question

Dear All,
Please help me with this query.
Kindly could you guide me on updating an Excel Sheet which is saved on my local server through a WebService which is deployed on the WebApp Server. The Server is located locally too. I have developed the WebService on the NWDS.
I have tried using POI and ODBC for updating the sheet. But it appears to me that the server is unable to fetch the excel sheet.
Please could you provide your valuable suggestions on this.
Regards,
Suyukti B N

Answer 1

Hi,
Thanks for your reply.  Below are more details regarding my question. I am trying to achieve the requirement with :
Java WebDynpro (Front End) <--> WebService (Middle Tier) <->ODBC <---> Microsoft Excel (Back End)
1) I am Using the Java perspective to create the service method. The method has to read and update the excel sheet. I have created a ODBC DataSource on my local machine. I also have the SAP WebApp Server on my local machine. Below is the method I am using for "reading" the excel :
public String read(){
Connection connection = null;
String columnValue = "";
        try {
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     Connection con = DriverManager.getConnection   ("jdbc:odbc:DS");
                Statement st = con.createStatement();
     ResultSet rs = st.executeQuery("Select * from [Sheet1$]");
     ResultSetMetaData rsmd = rs.getMetaData();
     int numberOfColumns = rsmd.getColumnCount();
     while (rs.next()) {
     for (int i = 1; i <= numberOfColumns; i++) {
         if (i > 1)                           System.out.print(", ");                columnValue = rs.getString(i);
     System.out.println("value is" + columnValue);
     st.close();
     con.close();
          } catch (Exception ex) {
          System.err.print("Exception: ");
          System.err.println(ex.getMessage());
          return "false" + ex.toString();
     return "true";
This code works perfectly fine and provides me the values that are present on the Excel Sheet.
2) I now switch over from the Java Perspective to the WebService Perspective on my NetWeaver Developer Studio. I create a new WebService for the above Java method.
3) I then create an Ear file and deploy on the Server.
4) Now when I click on Test WebService, the values that are returned from the Excel are "null". It shows return String as False and an SQL Exception. java.sql.SQLException: General error.
Hence I concluded that after deploying the Service on the Server, the Excel Sheet is not being fetched or read.
Please could you provide your thoughts on this.
Thank You Very Much,
Warm Regards,
Suyukti B N