请求第三方https接口

1. 生成证书
   根据第三方提供的.cer证书，我们可以用JDK的keytool工具生成keystore密钥库文件
   a. keytool -import -v -file E:\cer\esb.*****-p.com.cn.cer -keystore F:tomcat.keystor
   

   b. 输入密码（自己给的密码）
   

   c.回车提示是否信任此证书（y信任）
   

2. 代码请求https接口

   public static String httpsPost(String url, String json) {
   InputStream inputStream = null;
   String jsonString = "";
   try {
   DefaultHttpClient client = new DefaultHttpClient();
   CloseableHttpClient httpClient = HttpClients.createDefault();
   client.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.BROWSER_COMPATIBILITY);
   client.getParams().setParameter(CoreProtocolPNames.USER_AGENT,
   " Mozilla/5.0 (Windows NT 6.2; rv:18.0) Gecko/20100101 Firefox/18.0");

   // 获得密匙库
   KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
   ClassPathResource resource = new ClassPathResource("tomcat.keystore");

   // 获取输入流
   inputStream = resource.getInputStream();

   // 密匙库的密码
   trustStore.load(inputStream, "123456".toCharArray());

   // 注册密匙库
   SSLSocketFactory socketFactory = new SSLSocketFactory(trustStore);

   // 不校验域名
   socketFactory.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
   Scheme sch = new Scheme("https", 443, socketFactory);
   client.getConnectionManager().getSchemeRegistry().register(sch);

   HttpPost httppost = new HttpPost(url);
   StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
   httppost.setEntity(entity);

   // 发起请求
   HttpResponse response = client.execute(httppost);

   // 获取响应
   HttpEntity resEntity = response.getEntity();
   jsonString = EntityUtils.toString(resEntity, "utf-8");
   } catch (Exception e) {
   e.printStackTrace();
   } finally {
   try {
   inputStream.close();
   } catch (IOException e) {
   e.printStackTrace();
   }
   }
   return jsonString;
   }