I cannot display image (read from oracle BLOB field) on browser?

I cannot display image (read from oracle BLOB field) on browser?
Following is my code, someone can give me an advise?
content.htm:
<html>
<h1>this is a test .</h1>
<hr>
<img src="showcontent.jsp">
</html>showcontent.jsp:
<%@ page import="com.stsc.util.*" %>
<%@ include file="/html/base.jsp" %>
<%
     STDataSet data = new STDataSet();
//get blob field from database
     String sql = "SELECT NR FROM ZWTAB WHERE BZH='liqf004' AND ZJH='001'";
     //get the result from database
     ResultSet rs = data.getResult(sql,dbBase);
     if (rs!=null && rs.next()) {
          Blob myBlob = rs.getBlob("NR");
          response.setContentType("image/jpeg");//
          byte[] ba = myBlob.getBytes(1, (int)myBlob.length());
          response.getOutputStream().write(ba);
          response.getOutputStream().flush();
     // close your result set, statement
     data.close();
%>

Don't use jsp for that, use servlet. because the jsp engine will send a blank lines to outPutStream corresponding to <%@ ...> tags and other contents included in your /html/base.jsp file before sending the image. The result will not be treated as a valid image by the browser.
To test this, type directly showcontent.jsp on your browser, and view it source.
regards

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яШяа�JFIF��`�`��яЫ�C� $.' ",#(7),01444'9=82<.342яЫ�C 2!!22222222222222222222222222222222222222222222222222яА�МЂ"�яД�� яД�µ��}�!1AQa"q2Ѓ‘Ў#B±БRСр$3br‚ %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyzѓ„…†‡€‰Љ’“”•–—�™љўЈ¤Ґ¦§Ё©ЄІіґµ¶·ё№єВГДЕЖЗИЙКТУФХЦЧШЩЪбвгдежзийкстуфхцчшщъяД�� яД�µ��w�!1AQaq"2ЃB‘Ў±Б #3RрbrС $4б%с
Please help!
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DOCID NUMBER(10) not null,
SHORTNAME VARCHAR2(30) not null,
FULLNAME VARCHAR2(250) not null,
FILENAME BLOB not null,
AUTHOR VARCHAR2(30) not null,
CREATIONDT DATE not null,
VERSION VARCHAR2(10) not null
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