您可以使用这个nginxjava解析器来读取、编辑和写入配置文件。
链接：https://github.com/odiszapc/nginx-java-parser
例子：

NgxConfig conf = NgxConfig.read("/etc/nginx/nginx.conf");
NgxParam workers = conf.findParam("worker_processes");       // Ex.1
workers.getValue(); // "1"
NgxParam listen = conf.findParam("http", "server", "listen"); // Ex.2
listen.getValue(); // "8889"
List<NgxEntry> rtmpServers = conf.findAll(NgxConfig.BLOCK, "rtmp", "server"); // Ex.3
for (NgxEntry entry : rtmpServers) {
    ((NgxBlock)entry).getName(); // "server"
    ((NgxBlock)entry).findParam("application", "live"); // "on" for the first iter, "off" for the second one
}