监听tomcat服务器启动/关闭并从配置文件中读取参数进行初始化

监听tomcat服务器启动/关闭很简单(2步)：

1. 建立一个类实现ServletContextListener接口，重写其中的方法(contextDestroyed和contextInitialized)。

package action;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class SystemListener implements ServletContextListener{
    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        // TODO Auto-generated method stub
    }
    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        // TODO Auto-generated method stub
    }
}

2. 在web.xml中注册该监听器。如下：

<listener>
      <description>监听tomcat</description>
      <display-name>test</display-name>
      <listener-class>listener.SystemListener</listener-class>
</listener>

监听tomcat启动和关闭就这么简单地完成了。可以把一些tomcat启动时就需要初始化的属性和需要完成的操作放到这步来完成。

下面是完整的项目代码：

1. 目录结构

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" alt="" width="239" height="354" />

2. 监听类

package listener;

import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import pub.SystemProperty;

/**
 * 系统上下文启动/关闭监听
 * 把需要初始化的数据放在contextInitialized方法里
 *
 * @author Sky
 * @date 2016年8月10日 上午9:32:09 listener
 */
public class SystemListener implements ServletContextListener {

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        System.out.println("tomcat关闭了...");
    }

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        System.out.println("tomcat启动了...");

        /**
         * 读取系统运行基本参数
         * 读取静态参数
         */
        InputStream input = null;
        try {
            input = SystemListener.class.getClassLoader().getResourceAsStream(
                    "sqlProperty.properties");
            Properties p = new Properties();
            p.load(input);

            String sqlPort = p.getProperty("port", "3306");
            SystemProperty.port = (sqlPort == null || "".equals(sqlPort)) ? 3306
                    : Integer.parseInt(sqlPort);
            SystemProperty.password = p.getProperty("password");

            System.out.println("系统初始化成功");

        } catch (Throwable e) {
            e.printStackTrace();
            System.out.println("系统配置文件SystemProperty.properties不存在或读取错误");
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        /**
         * 读取时间配置
         * 读取其他配置文件，并把配置文件的数据加入静态容器中，以便通过类名取出使用
         */
        input = null;
        try {
            input = SystemListener.class.getClassLoader().getResourceAsStream(
                    "timeProperty.properties");
            Properties p = new Properties();
            p.load(input);
            //列举
            Enumeration<?> propNames = p.propertyNames();
            while (propNames.hasMoreElements()) {
                String key = (String) propNames.nextElement();
                String value = p.getProperty(key, "");
                SystemProperty.propList.put(key, value); //放入静态容器中
            }

            System.out.println("时间配置初始化成功");

        } catch (Throwable e) {
            e.printStackTrace();
            System.out.println("时间配置文件timeProperty.properties不存在或读取错误");
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

3. struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <package name="abc" namespace="/" extends="struts-default">
        <action name="test" class="action.TestAction">
            <result name="input">/index.jsp</result>
            <result name="success">/success.jsp</result>
            <result name="fail">/fail.jsp</result>
        </action>
    </package>
</struts>    

3. web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">

  <listener>
      <description>监听tomcat</description>
      <display-name>test</display-name>
      <listener-class>listener.SystemListener</listener-class>
  </listener>

  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.action</url-pattern>
  </filter-mapping>
</web-app>

4. 静态属性、容器类(方便使用类名直接调用)

package pub;

import java.util.HashMap;
import java.util.Map;

/**
 *  静态存储系统运行所需的基本参数，在启动的时候被初始化
 *
 * @author Sky
 * @date 2016年8月10日 上午10:19:12
 * pub
 */
public class SystemProperty {
    /*
     * 设置为静态，直接使用类名调用
     */
    public static int port; //端口号
    public static String password; //密码
    //静态容器，用来存储后面扩展添加的配置(添加其他的配置文件，使得本类来调用)
    public static Map<String, String> propList = new HashMap<String, String>();
}

5. properties配置文件

sqlProperty.properties

#端口号
port=1234
#密码
password=6666

timeProperty.properties

#默认时间2秒
normalTime=2000
#一天
oneDay=86400000

6. 测试(使用)类

package action;

import pub.SystemProperty;
import com.opensymphony.xwork2.ActionSupport;

public class TestAction extends ActionSupport {
    private static final long serialVersionUID = 1L;

    @Override
    public String execute() throws Exception {

        // 因为是静态变量，所以直接从类名.变量的方式获取
        int port = SystemProperty.port;
        String password = SystemProperty.password;

        System.out.println("port=" + port);
        System.out.println("password=" + password);

        //从静态容器中取
        String normalTime = SystemProperty.propList.get("normalTime");
        String oneDay = SystemProperty.propList.get("oneDay");

        System.out.println("normalTime=" + normalTime);
        System.out.println("oneDay=" + oneDay);

        return SUCCESS;
    }
}

7. 输出结果如下：

aaarticlea/png;base64,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" alt="" />

如有问题，请联系QQ:409169399，答案：Sky。