Show saved file (pdf/text/html/xml/image) content on page from database (BLOB) in ADF Application

importjava.io.BufferedInputStream;
importjava.io.IOException;
importjava.io.OutputStream;

importjava.sql.Blob;
importjava.sql.Connection;
importjava.sql.DriverManager;
importjava.sql.PreparedStatement;
importjava.sql.ResultSet;
importjava.sql.SQLException;

importjavax.servlet.ServletConfig;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

publicclassPreviewFileServletextends HttpServlet {
privatestaticfinal String CONTENT_TYPE ="text/html; charset=UTF-8";

publicvoidinit(ServletConfig config)throws ServletException {
super.init(config);
}

/**
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
publicvoiddoGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
//Get fileName from parameter
        String fileName =(request.getParameter("fname"));

        OutputStream os = response.getOutputStream();
        Connection conn =null;
try{
            System.out.println("FileName is- "+ fileName);
//Get database connection object
            conn = getDBConnection();
//Prepare statement using SQL query to get blob file using file name
            PreparedStatement statement =
                conn.prepareStatement("SELECT IMAGE_FILE FROM FILE_UPD_DWN WHERE FILE_NAME = ?");

//Pass file name as parameter
            statement.setString(1, fileName);

//Execute Statement, It'll return a result set
            ResultSet rs = statement.executeQuery();

//Get BLOB file and read binaryStream and write to outputStream
if(rs.next()){
                Blob blob = rs.getBlob("IMAGE_FILE");
                BufferedInputStream in =new BufferedInputStream(blob.getBinaryStream());
int b;
byte[] buffer =newbyte[10240];
while((b = in.read(buffer,0,10240))!=-1){
                    os.write(buffer,0, b);
}
                os.close();
}
}catch(Exception e){
            System.out.println(e);
}finally{
if(conn !=null){
try{
                    conn.close();
}catch(SQLException e){
}
}

if(os !=null){
                os.close();
}
}
}

/**Method to get oracle DB conncection object
     * @return
     * @throws Exception
     */
publicstatic Connection getDBConnection()throws Exception {
//Type4 Oracle JDBC driver
        String driver ="oracle.jdbc.driver.OracleDriver";
//Connection url string (hostname,portname, service name)
        String url ="jdbc:oracle:thin:@localhost:1521:XE";
//DB UserName
        String username ="HR";
//DB user password
        String password ="hr";

        Class.forName(driver);// load Oracle driver
//Get connecion object using above detail
        Connection conn = DriverManager.getConnection(url, username, password);
return conn;
}
}

<af:inlineFrameid="if2"inlineStyle="height:350px;width:800px;"sizing="preferred"
source="/previewfileservlet?fname=#{bindings.FileName.inputValue == null ? 'No' : bindings.FileName.inputValue}"/>