dearsenthil you have asked for getting an imagefrom the database please see this code 
..................> 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.io.*; 
import java.sql.*; 

public class getblob extends HttpServlet 
{ 
public void doGet(HttpServletRequest req, HttpServletResponse res) 
throws ServletException, IOException { 
res.setContentType("image/gif"); 
ServletOutputStream out = res.getOutputStream(); 
try 
{ 
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
Connection con =DriverManager.getConnection ("jdbc:odbc:venu","scott","tiger"); 
Statement st=con.createStatement(); 
System.out.println("before satement gets executed"); 
ResultSet rs=st.executeQuery("select image from images where sno=101"); 
System.out.println("query executed"); 
rs.next(); 
InputStream is=rs.getBinaryStream(1); 
byte[] buf = new byte[4 * 1024*1024]; 
int bytesRead; 
while ((bytesRead = is.read(buf)) != -1) 
{ 
out.write(buf, 0, bytesRead); 
} 
is.close(); 
st.close(); 
con.close(); 
//System.out.println(rs.getInt(1)); 

} 
catch (Exception e1) 
{ 
out.println(e1.toString()); 
} 
//fis.close(); 
} 
} 

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Hi 
I have the code to insert a blob and retrieve it. 
insblob.java---inserts blob into database 

import java.sql.*; 
import java.io.*; 

class insblob 
{ 
public static void main (String args []) throws SQLException 
{ 

Connection conn = null; 
// Load the Oracle JDBC driver 
try 
{ 
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
conn =DriverManager.getConnection("jdbc:odbc:cip","",""); 
} 
catch (ClassNotFoundException e) 
{ 
System.out.println(e); 
return; 
} 
// Connect to the database // You must put a database name after the @ sign in the connection URL. // You can use either the fully 
// specified SQL*net syntax or a short cut // syntax as <host>:<port>:<sid>. The example uses the short cut syntax. 
try 
{ 
//= DriverManager.getConnection ("jdbc:oracle:oci8:@america","danko","dino"); 

File pictFile = new File("c:/windows/Hlpbell.gif"); 
int pictFilelen = (int)pictFile.length(); 
InputStream fPict = new FileInputStream(pictFile); 
PreparedStatement myStmt = conn.prepareStatement("insert into imgblob values(?,?)") ; 
myStmt.setInt(1,102); 
myStmt.setBinaryStream(2,fPict, pictFilelen); 
int res = myStmt.executeUpdate(); 
System.out.println("image inserted"); 

myStmt.close(); 
conn.close(); 
} 
catch (Exception ex) 
{ 
System.out.println(ex); 
System.out.println(ex.getMessage()); 


} 

} 

} 



image.java--retrieves the blob 


import java.sql.*; 
import java.io.*; 
import javax.servlet.*; 
import javax.servlet.http.* ; 


public class image extends HttpServlet 
{ 

Connection conn= null; 
Statement st = null ; 
ResultSet rs = null; 


public void init(ServletConfig sc) throws ServletException 
{ 
super.init(sc); 


try { 
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
System.out.println("driver loaded"); 
conn =DriverManager.getConnection("jdbc:odbc:cip","",""); 
System.out.println("connected to database"); 
}catch (Exception e){ 
System.out.println(e); 
} 
} 

public void doGet(HttpServletRequest req,HttpServletResponse res) 
throws ServletException,IOException 
{ 
res.setContentType ("image/gif"); 
ServletOutputStream outstream = res.getOutputStream(); 

try { 
st = conn.createStatement (); 
rs = st.executeQuery ("select * from imgblob "); 

while (rs.next()) 
{ 



InputStream instream = rs.getBinaryStream("img"); 

// Create temporary buffer for read 
byte[] buffer = new byte[5*1024]; 

// length of bytes read 
int length = 0; 

// Fetch data 
while ((length = instream.read(buffer)) != -1) 
{ 
outstream.write (buffer, 0, length); 

} 
//buffer=null; 



} 

} catch(SQLException e){ 
System.out.println("hooo"+e); 

} 

} 
} 




i hope this serves ur request 
bye 
pramod