https Java SSLException protocol_version的問題解決方法

 咱們的業務代碼裏有須要用爬蟲爬取商品的圖片地址，而後在轉到咱們的服務器裏的過程，中間固然少不了下載圖片的過程，最近目標網站有些改變，就是以前http前綴的圖片地址部分改爲了https，而後就形成了一個問題，圖片下載不了，查看log，發現一個java的SSLException.

異常是： java.lang.RuntimeException:Received fatal alert: protocol_version

異常的根源是：javax.net.ssl.SSLException:  Received fatal alert: protocol_version.

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緣由是： https的請求須要加上ssl的驗證，可是代碼裏通常只用到http，即便用到https也只是換了個前綴，並無帶上ssl驗證的過程。

源代碼：

　　　　 private static final PoolingHttpClientConnectionManager HTTP_CLIENT_CONNECTION_MANAGER;
	private static final CloseableHttpClient HTTP_CLIENT;
	static {
		HTTP_CLIENT_CONNECTION_MANAGER = new PoolingHttpClientConnectionManager(RegistryBuilder
				.<ConnectionSocketFactory> create().register("http", PlainConnectionSocketFactory.getSocketFactory())
				.register("https", SSLConnectionSocketFactory.getSocketFactory()).build());
		HTTP_CLIENT_CONNECTION_MANAGER.setDefaultMaxPerRoute(100);
		HTTP_CLIENT_CONNECTION_MANAGER.setMaxTotal(200);
		RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(60000).setConnectTimeout(60000)
				.setSocketTimeout(60000).build();

		HTTP_CLIENT = HttpClientBuilder.create().setConnectionManager(HTTP_CLIENT_CONNECTION_MANAGER)
				.setDefaultRequestConfig(requestConfig).build();
	}

HttpGet httpGet = new HttpGet(url + (StringUtils.contains(url, "?") ? "&" : "?")

+ EntityUtils.toString(new UrlEncodedFormEntity(nameValuePairs, "UTF-8")));

 

CloseableHttpResponse httpResponse = HTTP_CLIENT.execute(httpGet);

　　

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 解決方法：加上SSL的驗證，加上協議

修改後可用的代碼：

private static final PoolingHttpClientConnectionManager HTTP_CLIENT_CONNECTION_MANAGER;
	private static final CloseableHttpClient HTTP_CLIENT;
	static {
		SSLContext ctx = SSLContexts.createSystemDefault();
		SSLConnectionSocketFactory fac =
				new SSLConnectionSocketFactory(ctx, new String[]{"SSLv2Hello", "TLSv1.2"}, null, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

		HTTP_CLIENT_CONNECTION_MANAGER = new PoolingHttpClientConnectionManager(RegistryBuilder
				.<ConnectionSocketFactory> create().register("http", PlainConnectionSocketFactory.getSocketFactory())
				.register("https", fac).build());
		HTTP_CLIENT_CONNECTION_MANAGER.setDefaultMaxPerRoute(100);
		HTTP_CLIENT_CONNECTION_MANAGER.setMaxTotal(200);
		RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(60000).setConnectTimeout(60000)
				.setSocketTimeout(60000).build();

		HTTP_CLIENT = HttpClientBuilder.create().setConnectionManager(HTTP_CLIENT_CONNECTION_MANAGER)
				.setDefaultRequestConfig(requestConfig).build();
	}

HttpGet httpGet = new HttpGet(url + (StringUtils.contains(url, "?") ? "&" : "?")

+ EntityUtils.toString(new UrlEncodedFormEntity(nameValuePairs, "UTF-8")));

 

CloseableHttpResponse httpResponse = HTTP_CLIENT.execute(httpGet);

　　

但願能幫到你。。。