JAVA HTTPS附件下載相關代碼（可忽略HTTPS請求的SSL證書）

 

	/**
	 * 附件下載
	 * 
	 * @param id 附件id
	 * @param response
	 * @throws IOException
	 * @throws NoSuchAlgorithmException
	 * @throws KeyManagementException
	 */
	@RequestMapping(value = "attachmentDownLoad", method = RequestMethod.GET)
	public void attachmentDownLoad(@RequestParam(value = "id", required = true) String id, HttpServletResponse response)
			throws IOException, NoSuchAlgorithmException, KeyManagementException {

		Attachment attachment = attachmentService.selectByPrimaryKey(id);
		String fileName = attachment.getFileName();

		HttpsURLConnection.setDefaultHostnameVerifier(new NullHostNameVerifier());
		SSLContext sc = SSLContext.getInstance("TLS");
		sc.init(null, trustAllCerts, new SecureRandom());
		HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

		byte[] data = FileCopyUtils.copyToByteArray(getInputHttpsStreamByGet(attachment.getStorgeUrl()));

		fileName = URLEncoder.encode(fileName, "UTF-8");
		response.reset();
		response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
		response.addHeader("Content-Length", "" + data.length);
		response.setContentType("application/octet-stream;charset=UTF-8");

		OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
		outputStream.write(data);
		outputStream.flush();
		outputStream.close();
	}

	public static InputStream getInputHttpsStreamByGet(String url) {
		try {
			HttpsURLConnection conn = (HttpsURLConnection) new URL(url).openConnection();
			conn.setReadTimeout(5000);
			conn.setConnectTimeout(5000);
			conn.setRequestMethod("GET");

			if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				InputStream inputStream = conn.getInputStream();
				return inputStream;
			}

		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	static TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
		@Override
		public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
			// TODO Auto-generated method stub
		}

		@Override
		public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
			// TODO Auto-generated method stub
		}

		@Override
		public X509Certificate[] getAcceptedIssuers() {
			// TODO Auto-generated method stub
			return null;
		}
	} };

	public class NullHostNameVerifier implements HostnameVerifier {
		/*
		 * (non-Javadoc)
		 * 
		 * @see javax.net.ssl.HostnameVerifier#verify(java.lang.String,
		 * javax.net.ssl.SSLSession)
		 */
		@Override
		public boolean verify(String arg0, SSLSession arg1) {
			// TODO Auto-generated method stub
			return true;
		}
	}