一个java swing 获取公网ip的程序， 服务器获取自己的公网ip并储存到数据库中， 客户端去数据库获取ip并写入到文件中， 用到了文件流模拟浏览器和系统托盘-Access to public network ip program a java swing server to get its own public ip and stored into the database, database of clients to obtain ip and write to a fi