<%
// 如果你想将输出包含在一个jsp中，可以用img标签调用本jsp
// <img src="pic.jsp?from=file&type=jpeg&src=c:\img\test.jpg">
// 图片来源, 从文件(file)或数据库(database)
String from = request.getParameter("from") == null ? "" : request.getParameter("from").toString();
// 图片类型, jpeg/gif/bmp
String type = request.getParameter("type") == null ? "" : request.getParameter("type").toString();
response.reset();
response.setContentType("image/" + type);
java.io.InputStream in = null;
// 方式1: 以流方式读取图片文件. pic.jsp?from=file&type=jpeg&file=c:\img\test.jpg
if ( from.equals("") || from.equals("file") )
{
in = new java.io.FileInputStream(request.getParameter("src").toString());
}
else // 方式2: 从数据库中读取流. pic.jsp?from=database&type=jpeg&src=168
{
java.util.List list = DbWrapper.executeQuery(
"select CONTENT from IMAGE where id = '" + request.getParameter("src").toString() + "'"
);
if ( list.size() > 0 )
{
in = (InputStream)(((java.util.Map)list.get(0)).get("CONTENT"));
}
}
if ( in != null )
{
byte[] b = new byte[1024];
int len;
while( (len = in.read(b)) != -1 )
{
response.getOutputStream().write(b);
}
in.close();
}
%>