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再附一个：

从库中读图片显示到页面上的主要源码
 <%@ page contentType="text/html;charset=iso8859_1"%>
<%@ page import="java.sql.ResultSet"%>
<jsp:useBean id="query" class="pub.MakeDB"/>
<%
String sql = "select * from images";
ResultSet rs = query.executeQuery(sql);
rs.next();
InputStream in = rs.getBinaryStream("image");
ServletOutputStream sos = response.getOutputStream();
int len = 0;
byte[] b = new byte[1024];
response.reset();
response.setContentType("image/gif");
while((len = in.read(b)) > 0)
sos.write(b,0,len);
in.close();
sos.close();
query.cls();
%>
如果是写到文件只要把sos
定义为DataOutputStream sos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("/a.gif")));