电脑监控软件实现（截图端、服务端、监控端）

最近在做的项目中客户有监控软件的需求。

需求：每5秒显示被监控电脑的桌面情况。

实现思路：

1.截图端：Timer每5秒截图、调用服务端接口上传。

2.服务端：保存截图到服务端本地并把截图信息保存到数据库，包括图片在服务端的保存路径。

3.监控端：①调用服务端下载List<ScreenShot>接口，下载需要显示的截图列表。②Timer每5秒调用服务端下载最新ScreenShot对象，加入监控端list<ScreenShot>中。③要显示某张截图时根据本地List<ScreenShot>中信息调用服务端下载截图接口把截图下载到本地并显示在pictureBox中，下载成功则把ScreenShot对象中isDownload属性标为true，一遍下次直接调用，避免重复下。

一、截图端

1.实现截屏功能。

        //截屏        PRivate void timerPrtSc_Tick(object sender, EventArgs e)        {　　　　　　　 //定义一个矩形  Rectangle rect = new Rectangle(); //该矩形大小为当前屏幕大小 rect = System.Windows.Forms.Screen.GetBounds(this); //定义Size类型，取得矩形的长和宽 Size mySize = new Size(rect.Width, rect.Height); //定义一个位图，长宽等于屏幕长宽 Bitmap bitmap = new Bitmap(rect.Width, rect.Height); //定义Graphics为了在bitmap上绘制图像 Graphics g = Graphics.FromImage(bitmap); //把mySize大小的屏幕绘制到Graphisc上 g.CopyFromScreen(0, 0, 0, 0, mySize); //创建文件路径 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); //上传文件到服务器 HttpPostData(R.URL, R.TimeOut, R.MultipartFile, filePath); //释放资源  bitmap.Dispose(); g.Dispose(); GC.Collect();        }

2.上传文件到服务器（模拟表单提交把要传送的文件转换成流post到服务器中）

        /// <summary>        /// 模拟表单Post数据(传送文件以及参数)到java服务端        /// </summary>        /// <param name="url">服务端url地址</param>        /// <param name="timeOut">响应时间</param>        /// <param name="fileKeyName">对应接口中    @RequestParam("file"),fileKeyName="file"</param>        /// <param name="filePath">要上传文件在本地的全路径</param>        /// <returns></returns>        ///         private string HttpPostData(string url, int timeOut, string fileKeyName, string filePath)        {            //stringDict为要传递的参数的集合            NameValueCollection stringDict = new NameValueCollection();            stringDict.Add("ip", ip);            stringDict.Add("user", program.UserId);            stringDict.Add("programId", program.ProgramId);            string responseContent=string.Empty;            //创建其支持存储区为内存的流            var memStream = new MemoryStream();            var webRequest = (HttpWebRequest)WebRequest.Create(url);            // 边界符            var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");            // 边界符            var beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "/r/n");            var fileStream = new FileStream(filePath, FileMode.Open, Fileaccess.Read);            // 最后的结束符            var endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--/r/n");            // 设置属性            webRequest.Method = "POST";            webRequest.Timeout = timeOut;            webRequest.ContentType = "multipart/form-data; boundary=" + boundary;            // 写入文件(以下字符串中name值对应接口中@RequestParam("file"),fileName为上传文件在本地的全路径)            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);            }            // 写入字符串的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);            }            // 写入最后的结束边界符            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服务端

1.服务端上传接口

    /**     * 上传截屏     * @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;    }

    /**     * 上传截屏     *      * 逻辑：     * 1，把文件转移到存储目录     * 2，生成screenshot对象保存起来     * @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)){                //创建对象                ScreenShot ss = new ScreenShot(file.getOriginalFilename(),ip,user,programId,localPath,timeStamp);                //保存到数据库                ss = screenShotRepository.save(ss);                return ss;            }                    } catch (IOException e) {            e.printStackTrace();        }        return null;    }            private String receiveFile(MultipartFile file) throws IOException {        String path;                //destPath为存储文件的目录地址，目录下文件夹和文件取名由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);        //新建一个名为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.服务端下载List<ScreenShot>接口

    /**     * 返回节目开始至当前时间点的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,