文章目錄

• 一、前言
• 1.1 定時任務
• 1.2 開發環境
• 1.3 技術實現
• 二、建立包含WEB.xml 的Maven 專案
• 2.1 建立多模組專案taskproject
• 2.2 配置task-web 子模組Add Web
• 2.3 配置Tomcat 執行Web 專案
• 三、定時任務開發
• 3.1 配置Spring
• 3.2 編寫自動任務類
• 3.3 執行專案驗證定時任務

一、前言

1.1 定時任務

1.2 開發環境

1.3 技術實現

二、建立包含WEB.xml 的Maven 專案

2.1 建立多模組專案taskproject

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    
    <groupId>pers.niaonao</groupId>
    <artifactId>taskproject</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <!--自動新增子模組-->
    <modules>
        <module>task-service</module>
        <module>task-web</module>
    </modules>
    
    <!--自定義屬性，用作版本控制-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <treasureFinal.version>1.0.0</treasureFinal.version>
        <junit.version>4.11</junit.version>
        <spring.version>4.3.3.RELEASE</spring.version>
        <spring.remoting.version>2.0.8</spring.remoting.version>
        <useragent.version>1.20</useragent.version>
        <aspect.version>1.8.9</aspect.version>
    </properties>
    
    <!--依賴新增-->
    <dependencies>
        <!-- spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-remoting</artifactId>
            <version>${spring.remoting.version}</version>
        </dependency>
        <dependency>
            <groupId>eu.bitwalker</groupId>
            <artifactId>UserAgentUtils</artifactId>
            <version>${useragent.version}</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>${aspect.version}</version>
        </dependency>
    </dependencies>

</project>
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    子模組pom.xml 如下，其中task-web 引入了task-service 模組的依賴，這裡會呼叫task-service 模組的業務類。
2.1.2 子模組task-service 的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <!--自動引入父模組-->
    <parent>
        <artifactId>taskproject</artifactId>
        <groupId>pers.niaonao</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>task-service</artifactId>

</project>
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2.1.3 子模組task-web 的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>taskproject</artifactId>
        <groupId>pers.niaonao</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <!-- 設定打包方式為war -->
    <packaging>war</packaging>
    
    <!--引入要依賴的模組task-service -->
    <dependencies>
        <dependency>
            <groupId>pers.niaonao</groupId>
            <artifactId>task-service</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
    <artifactId>task-web</artifactId>
    
</project>
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2.2 配置task-web 子模組Add Web

2.3 配置Tomcat 執行Web 專案

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
Task Project!
</body>
</html>

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三、定時任務開發

3.1 配置Spring

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd
        ">
    
    <!--service註解掃描 -->
    <context:component-scan base-package="pers.niaonao.taskservice,pers.niaonao.taskweb">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    
    <!-- 引入SPRING配置檔案  -->
    <import resource="classpath:spring/spring-task.xml"/>

</beans>
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3.1.2 spring-task.xml

<?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:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd        
    http://www.springframework.org/schema/task
    http://www.springframework.org/schema/task/spring-task-3.1.xsd">
    
    <!-- 定時任務掃描器 -->
    <task:executor id="executor" pool-size="5"/>
    <task:scheduler id="scheduler" pool-size="5"/>
    <task:annotation-driven executor="executor" scheduler="scheduler"/>
</beans>
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將Spring 配置到web.xml，通過Tomcat 部署專案，通過web.xml 載入Spring 配置。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/spring-config.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <!-- 防止spring記憶體溢位監聽器 -->
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>
</web-app>
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3.2 編寫自動任務類

package pers.niaonao.taskservice;

import org.springframework.stereotype.Service;

/**
 * @Description :使用者資產任務
 * @Author: niaonao
 * @Date: 2018/9/21 15:20
 */
@Service(value = "userAssetTask")
public class UserAssetTask {

    /**
     * 平臺使用者資產更新任務，模擬一個要執行的任務
     */
    public void platformUserAssetUpdate() {
        // 此處可呼叫你的service、util、entity 等，編寫你的定時任務具體的業務程式碼
        System.out.println("平臺使用者資產更新完成！");
    }
}
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3.2.2 AutoTask.java
此處設定定時任務週期為10 S執行一次。通過註解@Scheduled(cron = "0/10 * * * * ? ")實現。此處不介紹Cron 表示式，需要了解可參考此連結內容

package pers.niaonao.taskweb;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import pers.niaonao.taskservice.UserAssetTask;
import javax.annotation.Resource;

/**
 * @Description :定時器
 * @Author: niaonao
 * @Date: 2018/9/21 15:17
 */
@Component
public class AutoTask {

    @Resource
    private UserAssetTask userAssetTask;

    /**
     * 使用者資產定時更新任務
     * 10s 更新一次
     */
    @Scheduled(cron = "0/10 * *  * * ? ")
    public void platformUserAssetUpdate() {
        userAssetTask.platformUserAssetUpdate();
    }
}

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3.3 執行專案驗證定時任務