URLConnection解决HttpsSSL证书的问题

需求：数据对接接口为https，SSL证书的校验出错，因此需要跳过SSL证书的校验。

创建一个类

public class TrustAllTrustManager implements TrustManager, X509TrustManager {
    @Override
    public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
        return;
    }
    @Override
    public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
        return;
    }
    @Override
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }
}

在建立URLConnection之前就进行SSL证书的忽略

private void skipSslValidation() throws NoSuchAlgorithmException, KeyManagementException {
        //默认使用本地
        HostnameVerifier hv = new HostnameVerifier() {
            @Override
            public boolean verify(String urlHostName, SSLSession session) {
                return true;
            }
        };
        TrustManager[] trustAllCerts = {new TrustAllTrustManager()};
        SSLContext sc = SSLContext.getInstance("SSL");
        SSLSessionContext sslsc = sc.getServerSessionContext();
        sslsc.setSessionTimeout(0);
        sc.init(null, trustAllCerts, null);
        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        //  激活主机认证
        HttpsURLConnection.setDefaultHostnameVerifier(hv);
    }

对方接受的传参类型是application/x-www-form-urlencoded，传参用key=value的方式，并且参数之间用&拼接，有点类似GET请求

private String getCodeToToken(AuthRequestForm authRequestForm) {
        String result = "";
        HashMap<String,Object> hashMap = new HashMap<>();
        hashMap.put("grant_type",ssoLoginConfig.getGrantType());
        hashMap.put("client_id",ssoLoginConfig.getClientId());
        hashMap.put("client_secret",ssoLoginConfig.getClientSecret());
        hashMap.put("redirect_uri",authRequestForm.getRedirectUri());
        hashMap.put("code",authRequestForm.getCode());
        StringBuffer params = new StringBuffer();
        for (HashMap.Entry<String, Object> e : hashMap.entrySet()) {
            params.append(e.getKey());
            params.append("=");
            params.append(e.getValue());
            params.append("&");
        }
        URL reqURL;
        try {
            //跳过SSL验证
            skipSslValidation();
            reqURL = new URL(ssoLoginConfig.tokenUrl);
            HttpURLConnection httpsConn = (HttpsURLConnection)reqURL.openConnection();
            httpsConn.setDoOutput(true);
            httpsConn.setRequestMethod("POST");
            httpsConn.setRequestProperty("Content-type", "application/x-www-form-urlencoded");
            httpsConn.setRequestProperty("Accept-Charset", "utf-8");
            httpsConn.setRequestProperty("contentType", "utf-8");
            httpsConn.setRequestProperty("Content-Length", params.length() + "");
            OutputStreamWriter out = new OutputStreamWriter(httpsConn.getOutputStream(),"utf-8");
            out.write(params.toString());
            out.flush();
            out.close();
            //取得该连接的输入流，以读取响应内容
            InputStreamReader inputStreamReader = new InputStreamReader(httpsConn.getInputStream(),"utf-8");
            int respInt = inputStreamReader.read();
            while(respInt != -1) {
                result = result + (char) respInt;
                respInt = inputStreamReader.read();
            }
        } catch (IOException | NoSuchAlgorithmException | KeyManagementException e) {
            logger.error(AuthExceptionMsg.CODE_TO_TOKEN_ERROR.getMsg(), e.getMessage());
            throw new ServiceException(AuthExceptionMsg.CODE_TO_TOKEN_ERROR);
        }
        if (StringUtils.isEmpty(result)){
            return null;
        }else {
            return result;
        }
    }