因为有效期为180天，所以您将收到6个月后签名证书将过期的警告。如图6和图7中的最后一行所示。

Because the validity is 180 days, you will get the response that the signer certificate will expire after six months, as shown by the last line echoed in figures 6 and 7.

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要创建密钥对和自签署的公钥证书来表示J2SE和J2EE客户机，请转到命令提示符并在一行中键入下面的命令。

To create the key pair and self-signed public key certificate to represent the J2SE and J2EE clients, go to a command prompt and type the following command on a single line.

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在一行中键入下面的命令创建密钥对和自签署的公钥证书，以表示基于J2EE的EchoService客户机。

Type the following command on a single line to create a key pair and self-signed public key certificate to represent the J2EE-based EchoService client.

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