Hi frndz !!!!!! we are again here to share our practically done work in gwt i.e. we make a text file or we convert the richtexteditor matter into the text file as follows:-

This file is to make richtexteditor and in this file there is onclick event of a button which will asynchronously call the writee() method at server side

Note- Make a "image" folder in war folder of your project.In this folder the textfile and images for richtexteditor fuctionality pictures will save.

Write.java
package com.client;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Date;



import com.gargoylesoftware.htmlunit.javascript.host.Window;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RichTextArea;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.AbsolutePanel;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.RichTextArea.ExtendedFormatter;
import com.gwtext.client.widgets.Toolbar;
import com.gwtext.client.widgets.ToolbarButton;
import com.gwtext.client.widgets.event.ButtonListenerAdapter;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.gwtext.client.core.EventObject;
import com.google.gwt.user.datepicker.client.DateBox;
import com.gwtext.client.widgets.form.TimeField;
import com.google.gwt.user.datepicker.client.DateBox.DefaultFormat;
import com.google.gwt.i18n.client.DateTimeFormat;

@SuppressWarnings("deprecation")
public class Write extends Composite {

    RootPanel rootpanel;
    AbsolutePanel absolutePanel;
    Label stream;
    ListBox streamvalue ;
    Label subject;
    ListBox subjectvalue;
    Label lblTypeAProblem;
    RichTextArea richTextArea;
    ExtendedFormatter formatter;
      Toolbar tt;
     
      ToolbarButton bold;
      ToolbarButton italic;
      ToolbarButton underline;
      ToolbarButton  leftjustification;
      ToolbarButton  rightjustification;
      ToolbarButton  centerjustification;
   
      ListBox fontsize;
    public Write() {
        final GreetingServiceAsync a1= GWT.create(GreetingService.class);

        rootpanel=RootPanel.get();

        absolutePanel = new AbsolutePanel();
        rootpanel.add(absolutePanel, 191, -4);
        absolutePanel.setSize("450px", "382px");
        stream = new Label("Stream");
        absolutePanel.add(stream, 201, 22);
        richTextArea = new RichTextArea();
        absolutePanel.add(richTextArea, 86, 170);
        richTextArea.setSize("354px", "98px");

        formatter=richTextArea.getExtendedFormatter();
        tt=new Toolbar();

        absolutePanel.add(tt, 88, 130);
        tt.setSize("351px", "31px");
       
        fontsize = new ListBox();

        absolutePanel.add(fontsize, 244, 134);
        fontsize.setSize("35px", "27px");
        fontsize.addItem("1");
        fontsize.addItem("2");
        fontsize.addItem("3");
        fontsize.addItem("4");
        fontsize.addItem("5");
        fontsize.addItem("6");
        fontsize.addItem("7");


        // tglbtnB = new ToggleButton("B");

         bold=new ToolbarButton();
        //bold.setToggleGroup("");
        bold.setText("");
        bold.setTooltip("Bold");
        bold.setCls("button");
        bold.setToggleGroup("format");
        bold.setIconCls("G:/gwt-2.0.4/gwt-2.0.4/proj/war/images/bold.gif");
       
        tt.addButton(bold);
        bold.setSize("34px", "30px");

       
        italic=new ToolbarButton();
        italic.setText("");
        italic.setTooltip("Italic");
        italic.setToggleGroup("format");
        italic.setIcon("G:/gwt-2.0.4/gwt-2.0.4/proj/war/images/italic.gif");

        tt.addButton(italic);



        underline=new ToolbarButton();
        underline.setText("");
        underline.setToggleGroup("format");
        underline.setIcon("G:/gwt-2.0.4/gwt-2.0.4/proj/war/images/underline.gif");
        tt.addButton(underline);



        leftjustification=new ToolbarButton();
        leftjustification.setToggleGroup("justification");
        leftjustification.setTooltip("left");
        leftjustification.setText("");
        leftjustification.setIcon("G:/gwt-2.0.4/gwt-2.0.4/proj/war/images/justifyleft.gif");

        tt.addButton(leftjustification);


        centerjustification=new ToolbarButton();
        centerjustification.setToggleGroup("justification");
        centerjustification.setText("");
        centerjustification.setIcon("G:/gwt-2.0.4/gwt-2.0.4/proj/war/images/justifyCenter.gif");
        centerjustification.setTooltip("Center");

        tt.addButton(centerjustification);

        rightjustification=new ToolbarButton();
        rightjustification.setToggleGroup("justification");
        rightjustification.setText("");
        rightjustification.setIcon("G:/gwt-2.0.4/gwt-2.0.4/proj/war/images/justifyRight.gif");
        rightjustification.setTooltip("Right");

        tt.addButton(rightjustification);
       
       
        DateBox dateBox = new DateBox();
        dateBox.setFormat(new DefaultFormat(DateTimeFormat.getFullDateFormat()));
        absolutePanel.add(dateBox, 177, 549);
        dateBox.setSize("98px", "23px");
       
       
        Label lblEnterDatetime = new Label("Enter Date/Time");
        absolutePanel.add(lblEnterDatetime, 56, 549);
        TimeField timeField = new TimeField("New time field", "time_field", 100);
        absolutePanel.add(timeField, 298, 548);
       
        Label lblTitle = new Label("Title");
        absolutePanel.add(lblTitle, 119, 52);
        lblTitle.setSize("254px", "18px");
       
        final TextBox txtbxTitle = new TextBox();
        txtbxTitle.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                txtbxTitle.setText("");
            }
        });
        txtbxTitle.setText("Title");
        absolutePanel.add(txtbxTitle, 257, 46);
        txtbxTitle.setSize("166px", "16px");
       
        Label lblAuthor = new Label("Author");
        absolutePanel.add(lblAuthor, 124, 82);
        lblAuthor.setSize("257px", "18px");
       
        final TextBox txtbxAuthorName = new TextBox();
        txtbxAuthorName.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
               
                txtbxAuthorName.setText("");
            }
        });
        txtbxAuthorName.setText("Author name");
        absolutePanel.add(txtbxAuthorName, 260, 80);
        txtbxAuthorName.setSize("163px", "16px");
       
        Button button_1 = new Button("New button");
        button_1.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
            String ss=richTextArea.getText();
            String st=txtbxTitle.getText();
            String sa=txtbxAuthorName.getText();
            a1.writee(ss, sa,st, new AsyncCallback<String>() {
               
                @Override
                public void onSuccess(String result) {
                    // TODO Auto-generated method stub
                    System.out.println("i am just me jhiojjkj");
                   
                    System.out.println("i am just me");
                }
               
                @Override
                public void onFailure(Throwable caught) {
                    // TODO Auto-generated method stub
                   
                }
           
            });
            }
        });
        button_1.setText("Submit");
        absolutePanel.add(button_1, 213, 274);
        button_1.setSize("100px", "28px");






        bold.addListener(new ButtonListenerAdapter() {
            public void onClick(com.gwtext.client.widgets.Button button, EventObject e) {
            //richTextArea.setHTML("<b></b>");
           
            formatter.toggleBold();
            }
        });

        italic.addListener(new ButtonListenerAdapter() {
            public void onClick(com.gwtext.client.widgets.Button button, EventObject e) {
           
            formatter.toggleItalic();
            }
        });


        underline.addListener(new ButtonListenerAdapter() {
            public void onClick(com.gwtext.client.widgets.Button button, EventObject e) {
            formatter.toggleUnderline();
            }
        });




        leftjustification.addListener(new ButtonListenerAdapter() {
            public void onClick(com.gwtext.client.widgets.Button button, EventObject e) {
           
            formatter.setJustification(RichTextArea.Justification.LEFT);
            }
        });



        centerjustification.addListener(new ButtonListenerAdapter() {
            public void onClick(com.gwtext.client.widgets.Button button, EventObject e) {
                formatter.setJustification(RichTextArea.Justification.CENTER);
            }
        });


        rightjustification.addListener(new ButtonListenerAdapter() {
            public void onClick(com.gwtext.client.widgets.Button button, EventObject e) {
                formatter.setJustification(RichTextArea.Justification.RIGHT);
            }
        });



        fontsize.addChangeHandler(new ChangeHandler() {
            public void onChange(ChangeEvent event) {
                if(fontsize.isItemSelected(0))
            formatter.setFontSize(RichTextArea.FontSize.XX_SMALL);
               
                if(fontsize.isItemSelected(1))
                    formatter.setFontSize(RichTextArea.FontSize.X_SMALL);

                if(fontsize.isItemSelected(2))
                    formatter.setFontSize(RichTextArea.FontSize.SMALL);

                if(fontsize.isItemSelected(3))
                    formatter.setFontSize(RichTextArea.FontSize.MEDIUM);

                if(fontsize.isItemSelected(4))
                    formatter.setFontSize(RichTextArea.FontSize.LARGE);

                if(fontsize.isItemSelected(5))
                    formatter.setFontSize(RichTextArea.FontSize.X_LARGE);

                if(fontsize.isItemSelected(6))
                    formatter.setFontSize(RichTextArea.FontSize.XX_LARGE);

               

               
            }
        });

       

   


       
       
    }
   
}



GreetingService.java

package com.client;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;

/**
 * The client side stub for the RPC service.
 */
@RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
 
  String check(String name, String password);
  String sign(String name, String password);
  String writee(String ss,String st,String sa);
}



package com.client;

import com.google.gwt.user.client.rpc.AsyncCallback;

/**
 * The async counterpart of <code>GreetingService</code>.
 */
public interface GreetingServiceAsync {
 
  void check(String name, String password, AsyncCallback<String> callback);
  void sign(String name, String password, AsyncCallback<String> callback);
  void writee(String ss, String sa,String st, AsyncCallback<String> callback);

}



GreetingServiceImpl.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();

       
       
    
       
     System.out.println("12dssdsfdbvfd3456789");

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

Now You can use this code to make text file in gwt.
For any other discussion about this topic are most welcome ...