之前操作是这样的：
1.项目有一个二代身份证的扫描器，扫描过身份证后，照片会生成在一个指定的目录。
2.用户于去目录下找到这些照片，通过input type=file 上传。
3.用户点确定提交请求。
打算改造成这样的：
1.扫描过身份证后，照片生成在指定的目录；
2.在页面上点确定后就能直接上传到服务器（不需要中间的选择照片步骤）。
这样的目的是为了减少用户选择照片中间操作。。。
请教各位大大，如何实现这样的功能
------解决方案--------------------------------------------------------
- Java code
/** *Description: encapsule http protocol of uploading. *@param url The server url of handleing upload. *@param sessionId Session id *@param uploadFile The file that is going to be uploaded *@param param Other form parameters *@return *@throws */public static void doMultipartUpload( String url, String sessionId, File uploadFile, Map<String, String> param, UploadApplet applet, List<Map<String, String>> fileList, int index) { long blockSize = 5*MB; int rate = 0; long fileSize = uploadFile.length(); long uploadCount = ((long)(fileSize - 1)/blockSize) + 1; System.out.println("before loop ..................."+fileSize+"....."+ uploadCount); param.put("mu", "1"); List<Map<String, String>> fList = fileList; Map<String, String> fm = (Map)fList.get(index); for(long i = 0 ; i < uploadCount; i++) { param.put("n", "" + i); doMultipartUploadOne(url,i,blockSize, sessionId, uploadFile,param); rate = (int)((float)i / (float)uploadCount * 100); fm.put("RATE", ""+rate); updateUploadInfo(applet, fList); } fm.put("RATE", "100"); updateUploadInfo(applet, fList); } /** * */ public static void doMultipartUploadOne(String url,long n, long blockSize, String sessionId, File uploadFile, Map param) { try { long skip = n * blockSize; RandomAccessFile fin = new RandomAccessFile(uploadFile, "r"); fin.seek(skip); long fileSize = fin.length(); long uploadSize = (skip + blockSize > fileSize) ? fileSize - skip : blockSize; URL u = new URL(url); byte[] form_part = getFormData(param); byte[] end_data = ("\r\n--" + boundary + "--\r\n").getBytes(); long size = form_part.length + uploadSize + end_data.length; HttpURLConnection con = (HttpURLConnection)u.openConnection(); con.setRequestMethod("POST"); con.setDoInput(true); con.setDoOutput(true); con.addRequestProperty("Cookie","JSESSIONID="+sessionId); con.addRequestProperty("Connection","Keep-Alive"); con.addRequestProperty("Cache-Control", "no-cache"); con.setRequestProperty("Content-Type","multipart/form-data; boundary="+boundary); con.setRequestProperty("Content-Length",String.valueOf(size)); DataOutputStream out = new DataOutputStream(con.getOutputStream()); out.write(form_part); StringBuffer headerBuf = new StringBuffer(); headerBuf.append("Content-Disposition: form-data; name=\"file\"; filename=\"") .append(uploadFile.getAbsolutePath()).append("\"\r\n"); headerBuf.append("Content-Type: application/octet-stream\r\n\r\n"); out.write(headerBuf.toString().getBytes()); int rn2 = 0; long loadLen = 0L; byte[] buf2 = new byte[1024]; while((rn2=fin.read(buf2, 0, 1024))>0) { if(loadLen + rn2 >= blockSize){ out.write(buf2,0,(int)(uploadSize - loadLen)); break; } else { out.write(buf2,0,rn2); loadLen += rn2; } } out.write(end_data); out.flush(); out.close(); fin.close(); InputStream in = con.getInputStream(); StringBuffer respBuffer = new StringBuffer(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); String line = new String(); while((line = reader.readLine())!= null) { respBuffer.append(line); } fin.close(); con.disconnect(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static byte[] getFormData(Map<String, String> param) throws IOException { StringBuffer buf = new StringBuffer(); buf.append("--").append(boundary).append("\r\n"); for(Iterator itr = param.keySet().iterator();itr.hasNext(); ){ Object key = itr.next(); System.out.println("key:="+key.toString()); if(null != key && key instanceof String) { String sKey = (String)key; buf.append("Content-Disposition: form-data; name=\"").append(sKey).append("\"\r\n\r\n"); buf.append((String)param.get(sKey)).append("\r\n"); buf.append("--").append(boundary).append("\r\n"); } } return buf.toString().getBytes(); }