java - Java 请求中的 HTTPS SSL GET 失败

Question

当我使用 http 协议(protocol)请求某些内容时，我的代码可以正常工作并且我得到了预期的响应。但是当我创建一个使用 https 的版本时，我收到了 SSL 错误。我已经按照 this question 中的步骤进行操作，而且我认为我不需要 this question 中描述的 key /信任管理器.请参阅下面的代码。我将 key 和 trustmanager 设置为 null，因此 java 将采用默认值。我在那一步似乎没有出错，错误发生在 inputStream = connection.getInputStream(); 行。我不知道我还需要添加/设置什么来设置安全连接？

private String runSecureService(URL url)
{
    HttpsURLConnection connection = null;
    InputStream inputStream = null;
    SSLContext sslContext = null;

    try
    {
        sslContext = SSLContext.getInstance("SSL");
    }
    catch (NoSuchAlgorithmException e)
    {
        //this exception doesn't occur
    }

    try
    {
        sslContext.init(null, null, null);
    }
    catch (KeyManagementException e)
    {
        //this exception doesn't occur
    }

    HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());

    try
    {
        connection = (HttpsURLConnection) url.openConnection();
        connection.setRequestProperty("Authorization", clientCredentials.getBase64Authentication());

    !-----> inputStream = connection.getInputStream(); <------!
        InputStreamReader responseReader = new InputStreamReader(inputStream);

        //Read, print and return the response.
        ...

        return response;
    }
    catch (IOException e)
    {
        //do stuff...
    }
    finally
    {
        //close connection and inputstream...
    }
}

这里是错误:

javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
    at sun.security.ssl.InputRecord.handleUnknownRecord(Unknown Source)
    at sun.security.ssl.InputRecord.read(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)

Answer 1

如果您尝试发出 HTTPS 请求，但连接到远程服务器上的 HTTP 端口，则会收到此消息。

可能是您在请求中使用了错误的 HTTPS 端口号……或者服务器配置错误并且在 应该 的 HTTPS 端口上有一个 HTTP 连接监听器。