ext中显示数据库中存取的blog类型的图片

记录下来，方便以后再用~
servlet中图片存入：

public void SaveDeliveryReceipt(HttpServletRequest req,HttpServletResponse resp)throws ServletException, IOException {String strAdmin = (String) req.getSession().getAttribute("isAdmin");boolean isAdmin = "1".equals(strAdmin);Long op_id = Long.parseLong(req.getParameter("op_id"));String opt_type =  objectToString(req.getParameter("op_type"));Date opt_time = DateBuilder.strToUtilDateWithFormat(objectToString(req.getParameter("op_time")));String op_cert_dn =  URLDecoder.decode(objectToString(req.getParameter("op_certdn")), "utf-8");String signLog =  objectToString(req.getParameter("sign_data"));JSONObject json = new JSONObject();json.put("success", false);try {DiskFileUpload fu = new DiskFileUpload(); // 设置允许用户上传文件大小,单位:字节 fu.setHeaderEncoding("UTF-8");fu.setSizeMax(1000000000);List fileItems = fu.parseRequest(req);FileItem item = (FileItem) fileItems.get(0); // 只有一个文件InputStream inStream = item.getInputStream();ByteArrayOutputStream bytestream = new ByteArrayOutputStream();int ch;while ((ch = inStream.read()) != -1) {bytestream.write(ch);}byte imgdata[] = bytestream.toByteArray();bytestream.close();//统一图片大小this.ChangeImgSize(imgdata,300,300);String send_number = objectToString(req.getParameter("send_number"));CertSend certSend= new CertSend();certSend.setSend_number(send_number);CertSend objcertSend = certSendService.selectCert(certSend);this.writeByteArryToImage(imgdata, send_number);objcertSend.setReceive_evidence(imgdata);inStream.close();certSendService.updateCertSend(objcertSend);String strErrMsg = "用户签收凭据导入成功！";errMsg.setErrMsg(strErrMsg);json.put("err", errMsg);json.put("success", true);if(!isAdmin){opLog.writeOptLog(strErrMsg,op_id,null,op_cert_dn, opt_type,opt_time,"SUCCESS",signLog,null,null,null,null,null,null);}}catch (Exception e) {String strErrMsg = " 检测需要导入凭据是否已存在异常！";errMsg.setErrMsg(strErrMsg);json.put("err", errMsg.toJson());if(!isAdmin){sysLog.writeSysLog(strErrMsg,"FAILURE","SysCertImportServlet",e.getMessage());opLog.writeOptLog(strErrMsg,op_id, null,op_cert_dn, opt_type,opt_time, "FAILURE", signLog,null,null,null,null,null,null); }showErrMsg(json,strErrMsg,"SysCertImportServlet",e);}finally{try {resp.setContentType("text/html;charset=UTF-8");      resp.getWriter().write(json.toString());}catch (Exception e2) {}}}将blog类型取出：public void GetImageByteId(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException{String strId=req.getParameter("id");CertSend temp=new CertSend();temp.setSend_number(strId);CertSend query=certSendService.selectCert(temp);byte[] data=null;data= query.getReceive_evidence();try{//清除页面缓存resp.setHeader("Pragma", "No-cache");resp.setHeader("Cahe-Control", "no-cache");resp.setDateHeader("Expires", 0);InputStream inStream=new ByteArrayInputStream(data);int size=-1;size=inStream.read(data, 0, data.length);ServletOutputStream sout= resp.getOutputStream();if(size>0){sout.write(data,0,size);}inStream.close();//data=ChangeImgSize(data,w,h);}catch(Exception ex){ex.printStackTrace();}} 前台ext页面显示：{xtype : "component",width:200,height:300,autoHeight:true,id:"browseImage",name:"browseImage",autoEl:{tag:'img',src:'certSend.fm?method=GetImageByteId&id='+check+''}}