轻松把玩HttpClient之配置ssl，采用设置信任自签名证书实现https

在上篇文章《HttpClient配置ssl实现https简单示例——绕过证书验证》中简单分享了一下如何绕过证书验证。如果你想用httpclient访问一个网站，但是对方的证书没有通过ca认证或者其他问题导致证书不被信任，比如12306的证书就是这样的。所以对于这样的情况，你只能是选择绕过证书验证的方案了。

但是，如果是自己用jdk或者其他工具生成的证书，还是希望用其他方式认证自签名的证书，这篇文章就来分享一下如何设置信任自签名的证书。当然你也可以参考官网示例中。

要想信任自签名的证书，必须得知道密钥库的路径及密钥库的密码。然后加载到程序来才可以。具体代码如下：

	/**
	 * 设置信任自签名证书
	 * 	
	 * @param keyStorePath		密钥库路径
	 * @param keyStorepass		密钥库密码
	 * @return
	 */
	public static SSLContext custom(String keyStorePath, String keyStorepass){
		SSLContext sc = null;
		FileInputStream instream = null;
		KeyStore trustStore = null;
		try {
			trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
			instream = new FileInputStream(new File(keyStorePath));
			trustStore.load(instream, keyStorepass.toCharArray());
			// 相信自己的CA和所有自签名的证书
			sc = SSLContexts.custom().loadTrustMaterial(trustStore, new TrustSelfSignedStrategy()).build();
		} catch (KeyStoreException | NoSuchAlgorithmException| CertificateException | IOException | KeyManagementException e) {
			e.printStackTrace();
		} finally {
			try {
				instream.close();
			} catch (IOException e) {
			}
		}
		return sc;
	}

	/**
	 * 模拟请求
	 * 
	 * @param url		资源地址
	 * @param map	参数列表
	 * @param encoding	编码
	 * @return
	 * @throws ParseException
	 * @throws IOException
	 * @throws KeyManagementException 
	 * @throws NoSuchAlgorithmException 
	 * @throws ClientProtocolException 
	 */
	public static String send(String url, Map<String,String> map,String encoding) throws ClientProtocolException, IOException {
		String body = "";
		
		//tomcat是我自己的密钥库的密码，你可以替换成自己的
		//如果密码为空，则用"nopassword"代替
		SSLContext sslcontext = custom("D:\\keys\\wsriakey", "tomcat");
		
        // 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;
	}

	public static void main(String[] args) throws ParseException, IOException, KeyManagementException, NoSuchAlgorithmException{
		String url = "https://sso.tgb.com:8443/cas/login";
		String body = send(url, null, "utf-8");
		System.out.println("交易响应结果长度："+body.length());
		
		System.out.println("-----------------------------------");
		
		url = "https://kyfw.12306.cn/otn/";
		body = send(url, null, "utf-8");
		System.out.println("交易响应结果长度："+body.length());
	}