请求第三方https接口

1. 生成证书
   根据第三方提供的.cer证书，咱们能够用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（本身给的密码）
   

   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");

   // 得到密匙库
        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;

   }