Http Download
Http / Https 下载文件，startWith不能验证https，测试地址：https://storage.googleapis.com/golang/go1.7.3.windows-amd64.msi
private static final Logger logger = Logger.getLogger(MethodHandles.lookup().lookupClass());private static void sunNetSsl() {System.setProperty("java.protocol.handler.pkgs","com.sun.net.ssl.internal.www.protocol");Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());}private static void javaxNetSsl(){TrustManager[] trustAllCertArr = new TrustManager[]{new X509TrustManager() {public X509Certificate[] getAcceptedIssuers() {return null;}public void checkServerTrusted(X509Certificate[] certArr,String authType) throws CertificateException {}public void checkClientTrusted(X509Certificate[] certArr,String authType) throws CertificateException {}}};//activate trust managertry {SSLContext sc = SSLContext.getInstance("SSL");sc.init(null,trustAllCertArr,new SecureRandom());HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());} catch (NoSuchAlgorithmException | KeyManagementException e) {e.printStackTrace();}}public static void download(String downloadUrl,String fileName,boolean isHttps) throws IOException{if (isHttps) {logger.info(isHttps);javaxNetSsl();//sunNetSsl();}URL url = new URL(downloadUrl);try(ReadableByteChannel rbc = Channels.newChannel(url.openStream());FileOutputStream fos = new FileOutputStream(fileName)){fos.getChannel().transferFrom(rbc,0,Long.MAX_VALUE);}catch(IOException e){e.printStackTrace();}}