JSP读取Oracle数据库里的图片Blob字段并显示在页面上

1.java代码：

 /**
      * 打印模板获取电子签名
      * @param request
      * @param resp
      * @param id
      * @return
      * @throws Exception
      */
     @RequestMapping(value = "jzgx/getImage", method = RequestMethod.GET)
     public void getImage(HttpServletRequest request, HttpServletResponse response,String id){
         String sql = "SELECT SIGNATURE FROM RDP_PSIGNATURE P WHERE P.USER_ID = '"+id+"'";
         OutputStream os = null;
         try {
             RecordSet rs = OperDbUtil.getRecordSet(sql);
             os = response.getOutputStream();
             //设定输出文件头
             response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(id,"UTF-8"));
             //设置响应头
             response.setContentType("image/"+id+";charset=utf-8");
             if(rs.next()){
                 byte[] buf = rs.getBlob(1);
                 if(buf == null) return;
                 //清空输出流
                 response.reset();
                 os.write(buf);
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         //释放资源
         finally{
             try {
                 os.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }

OperDbUtil是一个我们公司自己写的工具类,没有可以用

 Connection conn = DBManager.getConnection();   PreparedStatement ps = null;
   ResultSet rs = null;
   InputStream is = null;
   OutputStream os = null;
    ps = conn.prepareStatement(sql);
    rs = ps.executeQuery();

来执行sql语句。

2.jsp页面：

 <%
 String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 %>
 ...
 ...
 ...
 <td><img src="<%=basePath%>jzgx/getImage.sd?id=${user1.id}" /></td>

跟网上大多数的不一样，仅供参考。