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public static  File saveToFiles(String destUrl,String path) throws IOException {
            final int BUFFER_SIZE = 4096;
            System.out.println("file download url is "+destUrl+" path is"+path+"--------------");
            FileOutputStream fos = null;
            BufferedInputStream bis = null;
            HttpURLConnection httpconn = null;
            URL url = null;
            byte[] buf = new byte[BUFFER_SIZE];
            int size = 0;
            if(rc.isUseProxy()){   // ´Ë´¦Îª¶ÁÈ¡ÅäÖÃÎļþµÄÄÚÈÝ£¬È·¶¨ÊÇ·ñʹÓôúÀí
                Properties   prop   =   System.getProperties(); 
                   //set http  proxy addr
                 prop.setProperty("http.proxyHost",   rc.getHttpProxyHost());      //ÉèÖôúÀíµÄIp
                  // set http  proxy port
                 prop.setProperty("http.proxyPort",   rc.getHttpProxyPort()+"");   //ÉèÖôúÀíµÄ¶Ë¿Ú
            }   
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