tomcat部署多个dubbo服务提供者,tomcat启动报20880端口占用

深藏阁楼爱情的钟 2023-07-24 14:42 23阅读 0赞

报错的主要内容节选

Caused by: com.alibaba.dubbo.remoting.RemotingException: Failed to bind NettyServer on /xxx.xxx.x.xxx:20880, cause: Failed to bind to: /0.0.0.0:20880
    Caused by: org.jboss.netty.channel.ChannelException: Failed to bind to: /0.0.0.0:20880
    Caused by: java.net.BindException: Address already in use

由于需求要求dubbo的服务提供者(例如:用户模块,产品模块,订单模块等),每个服务提供者为独立的服务,在开发的时候,maven父模块下,每个子项目模块为独立的war包,每个子模块内有各自的dubbo配置文件如下,在配置文件未修改之前是这样的<dubbo:protocol name=“dubbo” port=“20880” accesslog=“true”/>每次启动都会报端口占用,修改成什么端口都一样报端口占用(这里已排除tomcat配置文件加载两次的问题,配置文件是只加载了一次的),后来各种查找,找到这样一种解决办法,配置文件里端口-1,启动时使用随机端口,问题解决!  
非常感谢[https://blog.csdn.net/typ1805/article/details/81065990][https_blog.csdn.net_typ1805_article_details_81065990]此同学无私奉献提供的博文!

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans          
            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd          
            http://code.alibabatech.com/schema/dubbo          
            http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
            
        
        <bean id="xxxService" class="com.xxx.service.impl.xxxServiceImpl"/>
        
    	
    	<dubbo:application name="xxx.provider" />
    	
     	<dubbo:registry protocol="zookeeper" address="zookeeper://192.168.0.160:2181" />
    	
    	
        <dubbo:protocol name="dubbo" port="-1" accesslog="true"/>
        
        <dubbo:service interface="com.xxx.facade.xxxService" ref="xxxService" timeout="600000"/>
    </beans>

package com.xxx.dubbo;
    
    import java.util.Map;
    import javax.annotation.PostConstruct;
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.context.ConfigurableApplicationContext;
    import java.util.Map.Entry;
    import com.alibaba.dubbo.common.utils.NetUtils;
    import com.alibaba.dubbo.config.ProtocolConfig;
    
    /** * 一个机器部署两个dubbo生产者服务会产生端口占用问题，为了解决这个问题，在加载dubbo配置文件之前，先设置没被占用的端口 * @author typ */
    public class DynamicDubboPortReader implements ApplicationContextAware{ 
    
    	@Autowired
        private ApplicationContext applicationContext;
    
        private int port = 20880;
    
        @PostConstruct
        public void init(){ 
            Map<String, ProtocolConfig> map = applicationContext.getBeansOfType(ProtocolConfig.class);
            for(Entry<String,ProtocolConfig> con: map.entrySet()){ 
                port = NetUtils.getAvailablePort();
                System.out.println("=========="+port);
                con.getValue().setPort(port);
            }
        }
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 
            this.applicationContext = (ConfigurableApplicationContext)applicationContext;
        }
    
    }

[https_blog.csdn.net_typ1805_article_details_81065990]: https://blog.csdn.net/typ1805/article/details/81065990