電腦監控軟件實現（截圖端、服務端、監控端）

最近在做的項目中客戶有監控軟件的需求。

需求：每5秒顯示被監控電腦的桌面情況。

實現思路：

1.截圖端：Timer每5秒截圖、調用服務端接口上傳。

2.服務端：保存截圖到服務端本地并把截圖信息保存到數據庫，包括圖片在服務端的保存路徑。

3.監控端：①調用服務端下載List<ScreenShot>接口，下載需要顯示的截圖列表。②Timer每5秒調用服務端下載最新ScreenShot對象，加入監控端list<ScreenShot>中。③要顯示某張截圖時根據本地List<ScreenShot>中信息調用服務端下載截圖接口把截圖下載到本地并顯示在pictureBox中，下載成功則把ScreenShot對象中isDownload屬性標為true，一遍下次直接調用，避免重復下。

一、截圖端

1.實現截屏功能。

        //截屏        PRivate void timerPrtSc_Tick(object sender, EventArgs e)        {　　　　　　　 //定義一個矩形  Rectangle rect = new Rectangle(); //該矩形大小為當前屏幕大小 rect = System.Windows.Forms.Screen.GetBounds(this); //定義Size類型，取得矩形的長和寬 Size mySize = new Size(rect.Width, rect.Height); //定義一個位圖，長寬等于屏幕長寬 Bitmap bitmap = new Bitmap(rect.Width, rect.Height); //定義Graphics為了在bitmap上繪制圖像 Graphics g = Graphics.FromImage(bitmap); //把mySize大小的屏幕繪制到Graphisc上 g.CopyFromScreen(0, 0, 0, 0, mySize); //創建文件路徑 string ImageName = DateTime.Now.ToString("yyyyMMdd_HHmmss") + ".png"; string dir = @"./upload/"; if (!Directory.Exists(dir)) { Directory.CreateDirectory(dir); } string filePath = dir + ImageName; //保存文件到本地 bitmap.Save(filePath); //上傳文件到服務器 HttpPostData(R.URL, R.TimeOut, R.MultipartFile, filePath); //釋放資源  bitmap.Dispose(); g.Dispose(); GC.Collect();        }

2.上傳文件到服務器（模擬表單提交把要傳送的文件轉換成流post到服務器中）

        /// <summary>        /// 模擬表單Post數據(傳送文件以及參數)到java服務端        /// </summary>        /// <param name="url">服務端url地址</param>        /// <param name="timeOut">響應時間</param>        /// <param name="fileKeyName">對應接口中    @RequestParam("file"),fileKeyName="file"</param>        /// <param name="filePath">要上傳文件在本地的全路徑</param>        /// <returns></returns>        ///         private string HttpPostData(string url, int timeOut, string fileKeyName, string filePath)        {            //stringDict為要傳遞的參數的集合            NameValueCollection stringDict = new NameValueCollection();            stringDict.Add("ip", ip);            stringDict.Add("user", program.UserId);            stringDict.Add("programId", program.ProgramId);            string responseContent=string.Empty;            //創建其支持存儲區為內存的流            var memStream = new MemoryStream();            var webRequest = (HttpWebRequest)WebRequest.Create(url);            // 邊界符            var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");            // 邊界符            var beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "/r/n");            var fileStream = new FileStream(filePath, FileMode.Open, Fileaccess.Read);            // 最后的結束符            var endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--/r/n");            // 設置屬性            webRequest.Method = "POST";            webRequest.Timeout = timeOut;            webRequest.ContentType = "multipart/form-data; boundary=" + boundary;            // 寫入文件(以下字符串中name值對應接口中@RequestParam("file"),fileName為上傳文件在本地的全路徑)            const string filePartHeader =                "Content-Disposition: form-data; name=/"{0}/"; filename=/"{1}/"/r/n" +                 "Content-Type: application/octet-stream/r/n/r/n";            var header = string.Format(filePartHeader, fileKeyName, filePath);            var headerbytes = Encoding.UTF8.GetBytes(header);            memStream.Write(beginBoundary, 0, beginBoundary.Length);            memStream.Write(headerbytes, 0, headerbytes.Length);            var buffer = new byte[1024];            int bytesRead; // =0            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)            {                memStream.Write(buffer, 0, bytesRead);            }            // 寫入字符串的Key            var stringKeyHeader = "/r/n--" + boundary +                                   "/r/nContent-Disposition: form-data; name=/"{0}/"" +                                   "/r/n/r/n{1}/r/n";            foreach (byte[] formitembytes in from string key in stringDict.Keys                                             select string.Format(stringKeyHeader, key, stringDict[key])                                                 into formitem                                                 select Encoding.UTF8.GetBytes(formitem))            {                memStream.Write(formitembytes, 0, formitembytes.Length);            }            // 寫入最后的結束邊界符            memStream.Write(endBoundary, 0, endBoundary.Length);            webRequest.ContentLength = memStream.Length;            var requestStream = webRequest.GetRequestStream();            memStream.Position = 0;            var tempBuffer = new byte[memStream.Length];            memStream.Read(tempBuffer, 0, tempBuffer.Length);            memStream.Close();            requestStream.Write(tempBuffer, 0, tempBuffer.Length);            requestStream.Close();            var httpWebResponse = (HttpWebResponse)webRequest.GetResponse();            using (var httpStreamReader = new StreamReader(httpWebResponse.GetResponseStream(),                                                            Encoding.GetEncoding("utf-8")))            {                responseContent = httpStreamReader.ReadToEnd();            }            fileStream.Close();            httpWebResponse.Close();            webRequest.Abort();            return responseContent;        }

二、Java服務端

1.服務端上傳接口

    /**     * 上傳截屏     * @param ip     * @param filename     * @return     */        @RequestMapping(value="upload",method=RequestMethod.POST)    @ResponseBody    public Map<String, String> upload(             @RequestParam("ip") String ip,            @RequestParam("user") String user,            @RequestParam("programId") String programId,            @RequestParam("file") MultipartFile file            ){                Map<String, String> result = new HashMap<String, String>();        logger.info("file name " + file.getOriginalFilename());        ScreenShot ss=screenShotService.upload(ip.trim(), user.trim(), programId.trim(), file);        result.put("ip", ss.getId());        result.put("user", ss.getUser());        result.put("channel", ss.getProgramId());        result.put("localpath", ss.getLocalPath());        return result;    }

    /**     * 上傳截屏     *      * 邏輯：     * 1，把文件轉移到存儲目錄     * 2，生成screenshot對象保存起來     * @param ip      * @param filename     */    public ScreenShot upload(String userIP,String userName,String programid, MultipartFile file)    {                try {            String ip=userIP;            String user=userName;            String programId=programid;            String localPath = receiveFile(file);            Long timeStamp=System.currentTimeMillis();            if (StringUtils.isNotBlank(localPath)){                //創建對象                ScreenShot ss = new ScreenShot(file.getOriginalFilename(),ip,user,programId,localPath,timeStamp);                //保存到數據庫                ss = screenShotRepository.save(ss);                return ss;            }                    } catch (IOException e) {            e.printStackTrace();        }        return null;    }            private String receiveFile(MultipartFile file) throws IOException {        String path;                //destPath為存儲文件的目錄地址，目錄下文件夾和文件取名由ileUtil.buildNewFileName()完成        String destPath = FileUtil.buildNewFileName(configService.getUploadRootPath() + Const._SPLASH, file.getOriginalFilename());        logger.info("upload file Path is " + file.getOriginalFilename()                 + " dest file name is " + destPath);        //新建一個名為dest的空文件        File dest = new File(destPath);        //把file放到dest的path        file.transferTo(dest);        path = dest.getPath();        return path;    }

2.服務端下載List<ScreenShot>接口

    /**     * 返回節目開始至當前時間點的List<ScreenShot>     * @param timeStamp     * @param ip     * @return     */    @RequestMapping (value = "searchList")    @ResponseBody    public Map<String,Object> searchList(            @RequestParam( value = "ip", defaultValue="" ) String ip,            @RequestParam( value = "startId", defaultValue="" ) String startId,