java项目中获取本项目端口号

将此类作为bean组件交给spring管理
在需要使用的地方注入:
@Autowired
PortConfig portConfig;

import java.util.Iterator;
import java.util.Set;

import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.ObjectName;
import javax.management.Query;

import org.springframework.boot.web.context.WebServerInitializedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

/**
 *   获取当前项目运行端口号---整合
 *
 */
@Component
public class PortConfig implements ApplicationListener<WebServerInitializedEvent> {

    private Integer port = 0;

    /**
     *  对外获取当前项目端口
     * @return
     */
    public Integer getProPort() {
        if (this.port == 0) {   //  表明当前项目运行在第三方插件(如tomcat)
            this.port = getPort();
        }
        return this.port;
    }

    @Override
    public void onApplicationEvent(WebServerInitializedEvent event) {
        this.port = event.getWebServer().getPort();
    }

    /**
     *  第三方获取项目端口
     * @return
     */
    private int getPort() {
        try {
            MBeanServer server;
            if (MBeanServerFactory.findMBeanServer(null).size() > 0) {
                server = MBeanServerFactory.findMBeanServer(null).get(0);
            } else {
                return -1;
            }

            Set<ObjectName> names = server.queryNames(new ObjectName("Catalina:type=Connector,*"),
                    Query.match(Query.attr("protocol"), Query.value("HTTP/1.1")));

            Iterator<ObjectName> iterator = names.iterator();
            if (iterator.hasNext()) {
                ObjectName name = iterator.next();
                return Integer.parseInt(server.getAttribute(name, "port").toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return -1;

    }

}