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() {
			@Override
			public void checkClientTrusted(
					java.security.cert.X509Certificate[] paramArrayOfX509Certificate,
					String paramString) throws CertificateException {
			}

			@Override
			public void checkServerTrusted(
					java.security.cert.X509Certificate[] paramArrayOfX509Certificate,
					String paramString) throws CertificateException {
			}

			@Override
			public 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。