学步园

<%
    // 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(); 
    }
%>