import sun.security.jgss.spnego.SpNegoCredElement; //导入依赖的package包/类
public GSSCredentialImpl(GSSManagerImpl gssManager,
                  GSSCredentialSpi mechElement) throws GSSException {

    init(gssManager);
    int usage = GSSCredential.ACCEPT_ONLY;
    if (mechElement.isInitiatorCredential()) {
        if (mechElement.isAcceptorCredential()) {
            usage = GSSCredential.INITIATE_AND_ACCEPT;
        } else {
            usage = GSSCredential.INITIATE_ONLY;
        }
    }
    SearchKey key = new SearchKey(mechElement.getMechanism(),
                                    usage);
    tempCred = mechElement;
    hashtable.put(key, tempCred);
    // More mechs that can use this cred, say, SPNEGO
    if (!GSSUtil.isSpNegoMech(mechElement.getMechanism())) {
        key = new SearchKey(GSSUtil.GSS_SPNEGO_MECH_OID, usage);
        hashtable.put(key, new SpNegoCredElement(mechElement));
    }
}