轻松把玩HttpClient之配置ssl，采用绕过证书验证实现https

上篇文章说道httpclient不能直接访问https的资源，这次就来模拟一下环境，然后配置https测试一下。在前面的文章中，分享了一篇自己生成并在tomcat中配置ssl的文章《Tomcat配置SSL》，大家可以据此来在本地配置https。我已经配置好了，效果是这样滴：

可以看到已经信任该证书（显示浅绿色小锁），浏览器可以正常访问。现在我们用代码测试一下：

public static void main(String[] args) throws ParseException, IOException, KeyManagementException, NoSuchAlgorithmException, HttpProcessException {String url = "https://sso.tgb.com:8443/cas/login";String body = send(url, null, "utf-8");System.out.println("交易响应结果：");System.out.println(body);System.out.println("-----------------------------------");}

发现抛出了异常，我知道的有两种方案（也许还有我不知道的方案），这里介绍第一种方案，也是用的比较多的方案——绕过证书验证。直接看代码吧：

/** * 绕过验证 *  * @return * @throws NoSuchAlgorithmException  * @throws KeyManagementException  */public static SSLContext createIgnoreVerifySSL() throws NoSuchAlgorithmException, KeyManagementException {SSLContext sc = SSLContext.getInstance("SSLv3");// 实现一个X509TrustManager接口，用于绕过验证，不用修改里面的方法X509TrustManager trustManager = new X509TrustManager() {@Overridepublic void checkClientTrusted(java.security.cert.X509Certificate[] paramArrayOfX509Certificate,String paramString) throws CertificateException {}@Overridepublic void checkServerTrusted(java.security.cert.X509Certificate[] paramArrayOfX509Certificate,String paramString) throws CertificateException {}@Overridepublic java.security.cert.X509Certificate[] getAcceptedIssuers() {return null;}};sc.init(null, new TrustManager[] { trustManager }, null);return sc;}

然后修改原来的send方法：

/** * 模拟请求 *  * @param url资源地址 * @param map参数列表 * @param encoding编码 * @return * @throws NoSuchAlgorithmException  * @throws KeyManagementException  * @throws IOException  * @throws ClientProtocolException  */public static String send(String url, Map<String,String> map,String encoding) throws KeyManagementException, NoSuchAlgorithmException, ClientProtocolException, IOException {String body = "";//采用绕过验证的方式处理https请求SSLContext sslcontext = createIgnoreVerifySSL();        // 设置协议http和https对应的处理socket链接工厂的对象        Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()            .register("http", PlainConnectionSocketFactory.INSTANCE)            .register("https", new SSLConnectionSocketFactory(sslcontext))            .build();        PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);        HttpClients.custom().setConnectionManager(connManager);        //创建自定义的httpclient对象CloseableHttpClient client = HttpClients.custom().setConnectionManager(connManager).build();//CloseableHttpClient client = HttpClients.createDefault();//创建post方式请求对象HttpPost httpPost = new HttpPost(url);//装填参数List<NameValuePair> nvps = new ArrayList<NameValuePair>();if(map!=null){for (Entry<String, String> entry : map.entrySet()) {nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));}}//设置参数到请求对象中httpPost.setEntity(new UrlEncodedFormEntity(nvps, encoding));System.out.println("请求地址："+url);System.out.println("请求参数："+nvps.toString());//设置header信息//指定报文头【Content-type】、【User-Agent】httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");//执行请求操作，并拿到结果（同步阻塞）CloseableHttpResponse response = client.execute(httpPost);//获取结果实体HttpEntity entity = response.getEntity();if (entity != null) {//按指定编码转换结果实体为String类型body = EntityUtils.toString(entity, encoding);}EntityUtils.consume(entity);//释放链接response.close();        return body;}

现在再进行测试，发现果然通了。

下篇介绍另一种方案，应对自己生成的证书，敬请期待。