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Selvalakshmi
Displaying file from database
1 Answer(s)      3 years ago
Posted in : JSP-Servlet


I have list of files in my database. I want to display these files in browser according to the input. My need is like google search result. when i click on the link it should display that corresponding file from database. I have list of file id related to search. I want to retrieve and display all the file using list of file ID. Is there is any other way? Please help. Thanks in advance.


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April 9, 2011 at 12:49 PM


1)fileid.jsp:

<%@ page import="java.sql.*,java.io.*,java.util.*" %> 
<HTML>
 <table >
   <%
  try{      
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");
    Statement stmt=con.createStatement();
    String strQuery = "select * from file";
    ResultSet rs = stmt.executeQuery(strQuery);
    while(rs.next()){
       %>
      <tr>
      <td>
       <a href="displayfile.jsp?fileid=<%=rs.getInt(1)%>">
      <%=rs.getInt("id")%></td>

      </tr>
      <%
    }
    rs.close();
    con.close();
    stmt.close();
  }
  catch(Exception e)
  {
    e.getMessage();
  }
  %>
 </table>
</HTML>

2)displayfile.jsp:

<%@ page import="java.sql.*,java.io.*,java.util.*" %> 
<%
  int id =  Integer.parseInt(request.getParameter("fileid"));
  try{      
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");      
    Statement st=con.createStatement();
    String strQuery = "select file_data from file where id="+id;
    ResultSet rs = st.executeQuery(strQuery);

    String fileLen="";
    if(rs.next()){
      fileLen = rs.getString(1);
    }  
    rs = st.executeQuery(strQuery);
    if(rs.next()){
      int len = fileLen.length();
      byte [] rb = new byte[len];
      InputStream is = rs.getBinaryStream(1);
      int index=is.read(rb, 0, len);  
      st.close();
      response.reset();
      response.getOutputStream().write(rb,0,len); 
      response.getOutputStream().flush();        
    }
  }
  catch (Exception e){
    e.printStackTrace();
  }
%>


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