您必须将 https://dctm-rest 处的服务器证书包含在您的 JRE(信任库)的白名单中

You have to include the server certificate at https://dctm-rest into the whitelist of your JRE (the truststore)

1) 在 JRE trustore 中包含服务器证书(jre/lib/security/cacerts)(不推荐)

要下载服务器证书，用浏览器打开站点，右键单击绿色锁，选择查看证书"并下载

To download the server certificate, open site with browser, right-click on green lock, select 'view certificate' and download

探索 cacerts 和导入可信证书的最简单方法是使用 GUI 工具，例如 portecle (http://portecle.sourceforge.net/).你也可以使用keytool

The simplest way to explore cacerts and import trusted certificate is to use a GUI tool like portecle (http://portecle.sourceforge.net/). You can also use keytool

keytool -import -trustcacerts -keystore /opt/java/jre/lib/security/cacerts -alias mycert -noprompt -storepass changeit -file /tmp/examplecert.crt

请参阅 如何将自签名证书正确导入默认情况下可供所有 Java 应用程序使用的 Java 密钥库?

2) 使用您自己的信任库并包含服务器证书(推荐)

2) Use your own truststore and include the server certificate (recommended)

System.setProperty ("javax.net.ssl.trustStore", path_to_your_trustore_jks_file);
System.setProperty ("javax.net.ssl.trustStorePassword", "password");

您还可以创建 SSLSocketFactory 并在连接之前添加到您的连接或使用静态方法应用于所有连接

You can also create an SSLSocketFactory and add to your connection before connecting or apply to all connections using the static method

HttpsURLConnection.setDefaultSSLSocketFactory(sslFactory);

这是一个创建套接字工厂的例子

This is an example to create the socket factory

//Load JKS keystore that includes the server certificate or the root
KeyStore keyStore = ... 
TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(keyStore);
SSLContext ctx = SSLContext.getInstance("TLS");
ctx.init(null, tmf.getTrustManagers(), null);
sslFactory = ctx.getSocketFactory();

3) 根本不使用信任库(完全不推荐)

请参阅为单个连接禁用 SSLHandshakeException(我不会复制解决方案)

See Disable SSLHandshakeException for a single connection (I will not copy the solution)