记录--java获取网络资源(图片、音频等)保存本地

注：本人开始运行下面报 java.io.FileNotFoundException ，纠结很久后清理tomcat后运行成功

//获取wav文件地址
            String vRecordUrl=(request.getParameter("vRecordUrl")==null?"":request.getParameter("vRecordUrl"));
            LogUtil.writeLog("getRecord callback  vRecordUrl"+vRecordUrl);
            //通话sessionId
            String vSessionId=(request.getParameter("vSessionId")==null?"":request.getParameter("vSessionId"));
            LogUtil.writeLog("getRecord callback  vSessionId"+vSessionId);
            //获取文件名称
            File file=new File(vRecordUrl);
            String fileName=file.getName();
            //获取项目路径
            //String path=request.getServletContext().getRealPath("/")+"WEB-INF/res/records/";
            String path = request.getSession().getServletContext().getRealPath("/WEB-INF/res/records/");

            URL url = new URL(vRecordUrl);
            // 打开连接
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            //设置请求超时为5s
            con.setConnectTimeout(5*1000);
            // 输入流
            InputStream is = con.getInputStream();  

            // 1K的数据缓冲
            byte[] bs = new byte[1024];
            // 读取到的数据长度
            int len;
            // 输出的文件流  

           OutputStream os = new FileOutputStream(path+"/"+fileName);
            // 开始读取
            while ((len = is.read(bs)) != -1) {
              os.write(bs, 0, len);
            }
            // 完毕，关闭所有链接
            os.close();
            is.close();