In this post we  are sharing the code to make udf file by text file....



Write.java

package com.server;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;

import com.client.GreetingService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;

/**
 * The server side implementation of the RPC service.
 */
@SuppressWarnings("serial")
public class GreetingServiceImpl extends RemoteServiceServlet implements
    GreetingService {
   
    Connection con=null;
    Statement st=null;
    ResultSet rs=null;
    String query;
   
    String url="jdbc:mysql://localhost:3306/logindb";
   
 public void call()
 {
     try
     {
         Class.forName("com.mysql.jdbc.Driver");
     }
     catch(ClassNotFoundException e)
     {
         System.out.print(e.getMessage());
     }
     try
     {
         con=DriverManager.getConnection(url, "root", "");
         st=con.createStatement();
     }
     catch(SQLException e)
     {
         System.out.println(e.getMessage());
     }
 }

@Override
public String check(String name, String password) {
    // TODO Auto-generated method stub
    String ss="no";
    call();
    try
    {
         rs = st.executeQuery("select * from admin where name='" + name + "' and password='" + password+"'" );
   
         if(rs.next())
        {
            ss="yes";
            System.out.println(rs.getString("name"));
            System.out.println(rs.getString("password"));
           
        }
       
    }
    catch(SQLException e)
    {
        System.out.println(e.getMessage());
       
    }
   
    return ss;
}

@Override
public String sign(String name, String password) {
   
    String ss="no";
    int k=0;
    call();
    try
    {
        k=st.executeUpdate("insert into admin values('" + name + "','" + password+"')" );
       
        if(k==1)
        {
            ss="yes";
           
        }
       
    }
    catch(SQLException e)
    {
        System.out.println(e.getMessage());
       
    }
   
    return ss;
   
    // TODO Auto-generated method stub
   
}

@SuppressWarnings("deprecation")
@Override
public String writee(String ss, String st, String sa) {
    // TODO Auto-generated method stub
    FileWriter ryt;
    try{
    System.out.println("123456789");
    Date today = new Date();
    // DateTimeFormat fmt = DateTimeFormat.getFormat("EEEE_MMMM_dd_yyyy");
        // prints Monday, December 17, 2007 in the default locale
        //GWT.log(fmt.format(today), null);

int s1=today.getDate();
int s2=today.getMonth();
int s3=today.getYear();
int s4=today.getHours();
int s5=today.getMinutes();
int s6=today.getSeconds();

     File ff=new File("G://gwt-2.0.4//gwt-2.0.4//proj//war//images//"+st+sa+"_"+s1+"."+s2+"."+s3+"_"+s4+"."+s5+"."+s6+".txt");
     ff.createNewFile();
     ryt=new FileWriter("G://gwt-2.0.4//gwt-2.0.4//proj//war//images//"+st+sa+"_"+s1+"."+s2+"."+s3+"_"+s4+"."+s5+"."+s6+".txt");
    
   
   
   
   
   
     BufferedWriter out = new BufferedWriter(ryt);
        out.write(ss);
       
       
       
        out.close();

       
       
        PDFConversion pdf=new PDFConversion();
        pdf.createPdf("G://gwt-2.0.4//gwt-2.0.4//proj//war//images//"+st+sa+"_"+s1+"."+s2+"."+s3+"_"+s4+"."+s5+"."+s6+".txt","G://gwt-2.0.4//gwt-2.0.4//proj//war//images//"+st+sa+"_"+s1+"."+s2+"."+s3+"_"+s4+"."+s5+"."+s6+".pdf",false);
       
       
       
     System.out.println("12dssdsfdbvfd3456789");

    }
    catch(Exception e)
    {
       
        System.out.println(e+"bghh");
    }
    return ss;
   
    }
}

PDFConversion.java


package com.server;
import com.google.gwt.user.client.ui.Frame;
import com.google.gwt.user.client.ui.RootPanel;
import com.gwtext.client.widgets.Window;
import com.gwtext.client.widgets.layout.FitLayout;
import com.lowagie.text.Document;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfWriter;
import java.io.File;
import java.io.FileOutputStream;
/**
 *
 * @author shunmuga
 */
public class PDFConversion
{
 /**
 * This method is used to convert the given file to a PDF format
 * @param inputFile - Name and the path of the file
 * @param outputFile - Name and the path where the PDF file to be saved
 * @param isPictureFile
 */

public void createPdf(String inputFile, String outputFile, boolean isPictureFile) {
    // TODO Auto-generated method stub
     Rectangle pageSize = new Rectangle(2780, 2525);
        Document pdfDocument = new Document(pageSize);
         String pdfFilePath = outputFile;
         try
         {
             FileOutputStream fileOutputStream = new FileOutputStream(pdfFilePath);
             PdfWriter writer = null;
             writer = PdfWriter.getInstance(pdfDocument, fileOutputStream);
             writer.open();
             pdfDocument.open();
             /**
             * Proceed if the file given is a picture file
             */
              if (isPictureFile)
             {
              pdfDocument.add(com.lowagie.text.Image.getInstance(inputFile));
             }
             /**
             * Proceed if the file given is (.txt,.html,.doc etc)
             */
             else
             {
             File file = new File(inputFile);
             pdfDocument.add(new Paragraph(org.apache.commons.io.FileUtils.readFileToString(file)));
             }
             RootPanel rt=RootPanel.get();
             pdfDocument.close();
             writer.close();
             final Window window = new Window();
             window.setTitle("Calculation");
             window.setClosable(true);
             window.setPlain(true);
             window.setLayout(new FitLayout());

             Frame pdfFrame = new Frame();
             pdfFrame.setSize("100%", "100%");

             pdfFrame.setUrl(outputFile);
             window.add(pdfFrame);
             window.setCloseAction(Window.CLOSE);
             window.show();
             rt.add(window);

            
            
         }
         catch (Exception exception)
         {
          System.out.println("Document Exception!" + exception);
         }

}
}

This will make the pdf file on server side.....