JAVA根据URL网址获取输入流

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方法一、

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//文件访问路径 String url = ""; InputStream intstream = new URL(url).openStream();

方法二、

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public InputStream getInputStreamByUrl(String strUrl) {         HttpURLConnection conn = null;         try {             URL url = new URL(strUrl);             conn = (HttpURLConnection) url.openConnection();             conn.setRequestMethod("GET");             conn.setConnectTimeout(20 * 1000);             final ByteArrayOutputStream output = new ByteArrayOutputStream();             IOUtils.copy(conn.getInputStream(), output);             return new ByteArrayInputStream(output.toByteArray());         } catch (Exception e) {             logger.error("getInputStreamByUrl 异常,exception is {}", e);         } finally {             try {                 if (conn != null) {                     conn.disconnect();                 }             } catch (Exception e) {             }         }         return null;     }