简单的Tomcat实现--2.3Tomcat的内置对象之service

service

• 在配置文件中添加service标签

  • <?xml version="1.0" encoding="UTF-8"?>
    <Server>
        <Service name="Catalina">
            <Engine defaultHost="localhost">
                <Host name="localhost">
                    <Context path="/b" docBase="d:/Java/JavaProjects/Jerrymice/webapps/b" />
                </Host>
            </Engine>
        </Service>
    </Server>
    

  • service标签是Engine标签的父标签

• 建立Service类

  • package jerrymice.catalina;
    
    import jerrymice.util.ServerXmlUtil;
    
    /**
     * @author ：xiaosong
     * @description：TODO
     * @date ：2020/8/5 10:21
     */
    public class Service {
        private final String name;
        private final Engine engine;
        private Server server;
    
        public Service(Server server){
            this.server = server;
            this.name = ServerXmlUtil.getServiceName();
            this.engine = new Engine(this);
        }
    
        public Engine getEngine(){
            return engine;
        }
        public String getName(){
            return name;
        }
    
        public Server getServer(){
            return server;
        }
    }
    

• 在Engine类中添加Service属性，并加入到构造方法中

  • package jerrymice.catalina;
    
    import cn.hutool.log.LogFactory;
    import jerrymice.util.ServerXmlUtil;
    
    import java.util.List;
    
    /**
     * @author ：xiaosong
     * @description：TODO
     * @date ：2020/8/4 22:59
     */
    public class Engine {
        private final String defaultHost;
        private List<Host> hosts;
        private Service service;
    
        public Engine(Service service){
            this.defaultHost = ServerXmlUtil.getEngineDefaultHost();
            this.hosts = ServerXmlUtil.getHosts(this);
            this.service = service;
            checkDefault();
        }
    
        /**
         * 检查时候存在默认的host，如果不存在的话抛出异常
         */
        private void checkDefault(){
            if (getDefaultHost() == null) {
                LogFactory.get().error("the default host does not exist!");
                throw new RuntimeException("the default host does not exist!");
            }
        }
    
        public Host getDefaultHost(){
            for (Host host : hosts) {
                if (defaultHost.equals(host.getName())){
                    return host;
                }
            }
            return null;
        }
    
        public Service getService(){
            return service;
        }
    }
    

• 和上面类似的处理，在ServerXmlUtil中建立工具方法

  •     public static String getServiceName(){
            String name = "";
            try{
                Document document = Jsoup.parse(Constant.serverXmlFile, "utf-8");
                Element service = document.select("Service").first();
                name = service.attr("name");
            }catch(IOException e){
                LogFactory.get().error(e);
            }
            return name;
        }
    

简单的Tomcat实现--2.3Tomcat的内置对象之service

原文：https://www.cnblogs.com/xsliu/p/13441372.html