注意：这不是答案，而是研究此问题的帮助。
尝试使用以下代码列出Java安装中的所有密码套件。
SSLServerSocketFactory ssf = (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();TreeMap<String, Boolean> ciphers = new TreeMap<>();for (String cipher : ssf.getSupportedCipherSuites()) ciphers.put(cipher, Boolean.FALSE);for (String cipher : ssf.getDefaultCipherSuites()) ciphers.put(cipher, Boolean.TRUE);System.out.println("Default Cipher");for (Entry<String, Boolean> cipher : ciphers.entrySet()) System.out.printf(" %-5s%s%n", (cipher.getValue() ? '*' : ' '), cipher.getKey());当我在jdk1.8.0_151（Windows，64位）上运行时，得到以下输出：
Default Cipher SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA * SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA SSL_DHE_DSS_WITH_DES_CBC_SHA SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA * SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA SSL_DHE_RSA_WITH_DES_CBC_SHA SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA SSL_DH_anon_WITH_3DES_EDE_CBC_SHA SSL_DH_anon_WITH_DES_CBC_SHA SSL_RSA_EXPORT_WITH_DES40_CBC_SHA * SSL_RSA_WITH_3DES_EDE_CBC_SHA SSL_RSA_WITH_DES_CBC_SHA SSL_RSA_WITH_NULL_MD5 SSL_RSA_WITH_NULL_SHA * TLS_DHE_DSS_WITH_AES_128_CBC_SHA * TLS_DHE_DSS_WITH_AES_128_CBC_SHA256 * TLS_DHE_DSS_WITH_AES_128_GCM_SHA256 * TLS_DHE_RSA_WITH_AES_128_CBC_SHA * TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 * TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 TLS_DH_anon_WITH_AES_128_CBC_SHA TLS_DH_anon_WITH_AES_128_CBC_SHA256 TLS_DH_anon_WITH_AES_128_GCM_SHA256 * TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA * TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 * TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 TLS_ECDHE_ECDSA_WITH_NULL_SHA * TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA * TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 * TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 TLS_ECDHE_RSA_WITH_NULL_SHA * TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA * TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256 * TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256 TLS_ECDH_ECDSA_WITH_NULL_SHA * TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDH_RSA_WITH_AES_128_CBC_SHA * TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256 * TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 TLS_ECDH_RSA_WITH_NULL_SHA TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA TLS_ECDH_anon_WITH_AES_128_CBC_SHA TLS_ECDH_anon_WITH_NULL_SHA * TLS_EMPTY_RENEGOTIATION_INFO_SCSV TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5 TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA TLS_KRB5_WITH_3DES_EDE_CBC_MD5 TLS_KRB5_WITH_3DES_EDE_CBC_SHA TLS_KRB5_WITH_DES_CBC_MD5 TLS_KRB5_WITH_DES_CBC_SHA * TLS_RSA_WITH_AES_128_CBC_SHA * TLS_RSA_WITH_AES_128_CBC_SHA256 * TLS_RSA_WITH_AES_128_GCM_SHA256 TLS_RSA_WITH_NULL_SHA256
然后，当我添加链接到的策略文件时，输出更改为：
Default Cipher SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA * SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA SSL_DHE_DSS_WITH_DES_CBC_SHA SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA * SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA SSL_DHE_RSA_WITH_DES_CBC_SHA SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA SSL_DH_anon_WITH_3DES_EDE_CBC_SHA SSL_DH_anon_WITH_DES_CBC_SHA SSL_RSA_EXPORT_WITH_DES40_CBC_SHA * SSL_RSA_WITH_3DES_EDE_CBC_SHA SSL_RSA_WITH_DES_CBC_SHA SSL_RSA_WITH_NULL_MD5 SSL_RSA_WITH_NULL_SHA * TLS_DHE_DSS_WITH_AES_128_CBC_SHA * TLS_DHE_DSS_WITH_AES_128_CBC_SHA256 * TLS_DHE_DSS_WITH_AES_128_GCM_SHA256 * TLS_DHE_DSS_WITH_AES_256_CBC_SHA * TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 * TLS_DHE_DSS_WITH_AES_256_GCM_SHA384 * TLS_DHE_RSA_WITH_AES_128_CBC_SHA * TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 * TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 * TLS_DHE_RSA_WITH_AES_256_CBC_SHA * TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 * TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 TLS_DH_anon_WITH_AES_128_CBC_SHA TLS_DH_anon_WITH_AES_128_CBC_SHA256 TLS_DH_anon_WITH_AES_128_GCM_SHA256 TLS_DH_anon_WITH_AES_256_CBC_SHA TLS_DH_anon_WITH_AES_256_CBC_SHA256 TLS_DH_anon_WITH_AES_256_GCM_SHA384 * TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA * TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 * TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 * TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA * TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 * TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 TLS_ECDHE_ECDSA_WITH_NULL_SHA * TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA * TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 * TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 * TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA * TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 * TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 TLS_ECDHE_RSA_WITH_NULL_SHA * TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA * TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256 * TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256 * TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA * TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384 * TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384 TLS_ECDH_ECDSA_WITH_NULL_SHA * TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA * TLS_ECDH_RSA_WITH_AES_128_CBC_SHA * TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256 * TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 * TLS_ECDH_RSA_WITH_AES_256_CBC_SHA * TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384 * TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384 TLS_ECDH_RSA_WITH_NULL_SHA TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA TLS_ECDH_anon_WITH_AES_128_CBC_SHA TLS_ECDH_anon_WITH_AES_256_CBC_SHA TLS_ECDH_anon_WITH_NULL_SHA * TLS_EMPTY_RENEGOTIATION_INFO_SCSV TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5 TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA TLS_KRB5_WITH_3DES_EDE_CBC_MD5 TLS_KRB5_WITH_3DES_EDE_CBC_SHA TLS_KRB5_WITH_DES_CBC_MD5 TLS_KRB5_WITH_DES_CBC_SHA * TLS_RSA_WITH_AES_128_CBC_SHA * TLS_RSA_WITH_AES_128_CBC_SHA256 * TLS_RSA_WITH_AES_128_GCM_SHA256 * TLS_RSA_WITH_AES_256_CBC_SHA * TLS_RSA_WITH_AES_256_CBC_SHA256 * TLS_RSA_WITH_AES_256_GCM_SHA384 TLS_RSA_WITH_NULL_SHA256
如您所见，添加策略文件将启用AES 256密码套件。
