公司有个需求是发起https请求对接国家数据接口，需要带header、cookie，并关闭ssl证书验证，搜了很多文章，都说用HttpsURLConnection发起请求，但不知为啥在封装body参数的时候一直报400封装出错，也欢迎指出不足。遂找了这古代的方法，方法虽老但能解决实际问题且不用导包。

HttpsURLConnection报错方法示例：

			// 发起HTTPS POST请求URL url = new URL("https://example.com/api/resource");connection = (HttpsURLConnection) url.openConnection();// 设置请求方法为POSTconnection.setRequestMethod("POST");connection.setDoOutput(true); // 允许写入请求体connection.setRequestProperty("Content-Type", "application/json");// 封装请求体参数，这里假设参数是一个 JSON 对象String requestBody = "{\"param1\":\"value1\", \"param2\":\"value2\"}";//此处封装body参数一直报错try (OutputStream os = connection.getOutputStream()) {byte[] input = requestBody.getBytes("utf-8");os.write(input, 0, input.length);}// 获取响应int responseCode = connection.getResponseCode();System.out.println("Response Code: " + responseCode);BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;StringBuilder response = new StringBuilder();while ((line = reader.readLine()) != null) {response.append(line);}reader.close();System.out.println("Response: " + response.toString());

使用方法（其实cookie也是在header里面）：

1.创建默认证书（可选）

    /*** 创建默认证书** @return*/public static CloseableHttpClient createSSLClientDefault() {try {SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {// 信任所有public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {return true;}}).build();HostnameVerifier hostnameVerifier = NoopHostnameVerifier.INSTANCE;SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, hostnameVerifier);return HttpClients.custom().setSSLSocketFactory(sslsf).build();} catch (Exception e) {e.printStackTrace();}return HttpClients.createDefault();}

2.post请求：

   public static String dopost(String reqUrl, String json, Map<String, String> headerMap) {String strResult = "";CloseableHttpResponse response = null;CloseableHttpClient httpClient = null;if (reqUrl.startsWith("https")) {//可选httpClient = createSSLClientDefault();} else {httpClient = HttpClients.custom().setDefaultRequestConfig(RequestConfig.custom().setSocketTimeout(1 * 60 * 1000).setConnectTimeout(1000).setConnectionRequestTimeout(1000).build()).build();}HttpEntity httpEntity = null;try {HttpPost httpPost = new HttpPost(reqUrl);if (headerMap != null) {headerMap.forEach((k, v) -> httpPost.addHeader(k, v));}StringEntity entity = new StringEntity(json, "UTF-8");//解决中文乱码问题entity.setContentType("application/json");httpPost.setEntity(entity);response = httpClient.execute(httpPost, HttpClientContext.create());int status = response.getStatusLine().getStatusCode();httpEntity = response.getEntity();if (status == 200) {String string = EntityUtils.toString(httpEntity, StandardCharsets.UTF_8);return EntityUtils.toString(httpEntity, StandardCharsets.UTF_8);} else {log.error(reqUrl + " 请求错误：\r\t" + EntityUtils.toString(httpEntity, StandardCharsets.UTF_8));}return strResult;} catch (IOException e) {e.printStackTrace();} finally {try {if (httpEntity != null) {EntityUtils.consume(httpEntity);}if (response != null) {response.close();}} catch (IOException e) {e.printStackTrace();}}return strResult;}

3.get请求：

    public static ResultVo sendHttpsRequest(String url, String requestMethod, Stringparam, Map<String, String> headers, String cookieStr) {ResultVo vo = new ResultVo();StringBuilder result = new StringBuilder();try {//屏蔽证书验证SSLContext sc = SSLContext.getInstance("SSL");sc.init(null, new TrustManager[]{new X509TrustManager() {@Overridepublic void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {}@Overridepublic void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {}@Overridepublic X509Certificate[] getAcceptedIssuers() {return new X509Certificate[0];}}}, new SecureRandom());URL console = new URL(url);HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();// GET/POSTconn.setRequestMethod(requestMethod);
//            conn.setDoOutput(true);conn.setDoInput(true);if ("POST".equals(requestMethod)) {try (DataOutputStream wr = new DataOutputStream(conn.getOutputStream())) {wr.writeBytes(param);wr.flush();}conn.setRequestProperty("Content-Type", "application/json");} else {if (null != param) {OutputStream outputStream = conn.getOutputStream();// 注意编码格式outputStream.write(param.getBytes("UTF-8"));outputStream.close();}}if (ObjectUtil.isNotEmpty(headers)) {for (String s : headers.keySet()) {conn.setRequestProperty(s, headers.get(s));}}conn.setRequestProperty("Cookie", cookieStr);// 设置证书忽略相关操作conn.setSSLSocketFactory(sc.getSocketFactory());conn.setHostnameVerifier(new HostnameVerifier() {@Overridepublic boolean verify(String s, SSLSession sslSession) {return true;}});conn.connect();int responseCode = conn.getResponseCode();if (responseCode == HttpURLConnection.HTTP_OK) {InputStream is = conn.getInputStream();BufferedReader br = new BufferedReader(new InputStreamReader(is));String ret = "";//输出响应信息while ((ret = br.readLine()) != null) {if (ret != null && !ret.trim().equals("")) {result.append(new String(ret.getBytes("utf-8"), "utf-8"));}}List<String> cookies = conn.getHeaderFields().get("Set-Cookie");//这里返回了连接的cookie信息if (cookies != null) {for (String cookie : cookies) {if (cookie.contains(SyncInfoConfig.COOKIE_NAME)) {// 找到目标CookieString sidCookie = cookie.split(";\\s*")[0];vo.setCookieInfo(sidCookie);break;}}}conn.disconnect();br.close();}} catch (NoSuchAlgorithmException | KeyManagementException | MalformedURLException e) {e.printStackTrace();} catch (IOException ioException) {ioException.printStackTrace();}if (ObjectUtil.isNotEmpty(result)) {vo.setResultStr(result.toString());}return vo;}