blob-照片转换与展示

File转java.sql.Blob（照片）Struts2

 public Blob photos(File zp) {
     Blob photo=null;
     try {
         FileInputStream fis = new FileInputStream(zp);
         BufferedInputStream bis = new BufferedInputStream(fis);
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         int c = bis.read();
         while (c != -1) {
            baos.write(c);
            c = bis.read();
         }
         bis.close();
         byte[] rtn= baos.toByteArray();
         InputStream input=new ByteArrayInputStream(rtn);
         photo = Hibernate.createBlob(input);
     } catch (FileNotFoundException e) {
         e.printStackTrace();
     } catch (IOException e) {
         e.printStackTrace();
     }
     return photo;
 }

FormFile转java.sql.Blob（照片）Struts1

 public Blob photos(FormFile zp) {
     Blob photo = null;
     if(zp !=null)
     {
     try {
         InputStream    input = zp.getInputStream();
             photo = Hibernate.createBlob(input);
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
     return photo;
 }

获取照片struts

 public void getZp(ActionMapping mapping, ActionForm actionform, HttpServletRequest request, HttpServletResponse response)  {
     Blob photo = "从数据库中返回的照片字段";
     OutputStream out = null;
     response.setContentType("image/jpeg");
     InputStream is = null;
     if(photo != null || !"".equals(photo))
     {
         try {
             is = photo.getBinaryStream();
             byte[] buffer = new byte[1024];
             out = response.getOutputStream();
             int length = 0;
             while((length = is.read(buffer)) != -1){
                 out.write(buffer,0,length);
             }
         } catch (Exception e) {
             log.error("用户没有录入照片"+e);
         }finally
         {
             try {
                 out.flush();
                 out.close();
             } catch (IOException e) {
                 log.error("流没有关闭"+e);
             }

         }
     }
 }

jsp页面：

 <c:if test="${not empty photo}"><!-- 请求获取照片 -->
     <img src="${Context}/admin/yzxx.do?method=getZp&id=${yzxx.id}" width="100" height="100" id="imageId"/>
 </c:if>
 <c:if test="${empty photo}"><!-- 照片为空时显示系统照片 -->
     <img src="${Context}/images/default_head.jpg" width="100" height="100" id="imageId"/>
 </c:if>