找到maven解壓目錄(D:\Program Files\Java\maven\apache-maven-3.5.4\conf)下的setting.xml,將proxies屬性下注釋的內容複製出來，設定host和port屬性即可:

<proxies>
    <!-- proxy
     | Specification for one proxy, to be used in connecting to the network.
     |
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>proxyuser</username>
      <password>proxypass</password>
      <host>proxy.host.net</host>
      <port>80</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
    </proxy>
    -->
	 <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username></username>
      <password></password>
      <host>xxx.xx.xx.xx</host>
      <port>xxxx</port>
      <nonProxyHosts></nonProxyHosts>
    </proxy>
  </proxies>