JSP讀取Oracle數據庫里的圖片Blob字段並顯示在頁面上

1.java代碼：

/**
     * 打印模板獲取電子簽名
     * @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();
            //設定輸出文件頭
            response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(id,"UTF-8"));
            //設置響應頭
            response.setContentType("image/"+id+";charset=utf-8");
            if(rs.next()){
                byte[] buf = rs.getBlob(1);
                if(buf == null) return;
                //清空輸出流    
                response.reset();            
                os.write(buf);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        //釋放資源
        finally{
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

 

OperDbUtil是一個我們公司自己寫的工具類,沒有可以用

Connection conn = DBManager.getConnection();3   PreparedStatement ps = null;
  ResultSet rs = null;
  InputStream is = null;
  OutputStream os = null;
   ps = conn.prepareStatement(sql);
   rs = ps.executeQuery();

來執行sql語句。

2.jsp頁面：

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

跟網上大多數的不一樣，僅供參考。