spring mvc 定时任务，避免同时执行两次

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spring

spring

spring版本：3.1.0 或以上

1.新建定时任务配置文件

如：applicationContext-jobs.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.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task.xsd"
	default-lazy-init="true">

	<!-- 定时器配置 task:executor/@pool-size：可以指定执行线程池的初始大小、最大大小 task:executor/@queue-capacity：等待执行的任务队列的容量 
		task:executor/@rejection-policy：当等待队已满时的策略，分为丢弃、由任务执行器直接运行等方式 -->

	<task:scheduler id="scheduler" pool-size="10" />
	
	<task:executor id="executor" keep-alive="3600"
		pool-size="100-200" queue-capacity="500"
		rejection-policy="CALLER_RUNS" />
	<task:annotation-driven executor="executor"
		scheduler="scheduler" />
</beans>

2. web.xml

<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>
			classpath:spring/applicationContext.xml,
			classpath:spring/applicationContext-jobs.xml
		</param-value>
	</context-param>

注：不要将 applicationContext-jobs.xml 在 applicationContext.xml 中引入，不然定时任务会同时执行两次

3. 定时任务类

@Component 这个注解一定要加上，不然定时器不会执行

import org.apache.log4j.Logger;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

/**
 *
 * 
 * @date 2019年3月9日
 * @since JDK 1.8
 */
@Component
public class Job {

	private static final Logger logger = Logger.getLogger(Job.class);

	// 0/15 * * * * ?  15秒钟执行一次
	// 0 0/1 * * * ?  一分钟执行一次
	@Scheduled(cron = "0/15 * * * * ?")
	public void doSomething() {
		logger.info("doSomething");
	}
}

pom.xml

<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.wjh</groupId>
	<artifactId>spring3-job</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>spring3-job Maven Webapp</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<!-- 编译时的编码 -->
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<!-- JDK版本 -->
		<project.compile.version>1.8</project.compile.version>

		<spring.version>3.1.0.RELEASE</spring.version>
	</properties>

	<dependencies>
		<!-- Start Spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</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-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-expression</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-tx</artifactId>
			<version>${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-test</artifactId>
			<version>${spring.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-mock</artifactId>
			<version>2.0.8</version>
			<scope>test</scope>
		</dependency>
		<!-- End Spring -->

		<dependency>
			<groupId>quartz</groupId>
			<artifactId>quartz</artifactId>
			<version>1.5.2</version>
		</dependency>

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.56</version>
		</dependency>

		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>2.9.8</version>
		</dependency>
		<!-- <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> 
			<version>2.9.8</version> </dependency> -->

		<dependency>
			<groupId>org.codehaus.jackson</groupId>
			<artifactId>jackson-mapper-asl</artifactId>
			<version>1.9.13</version>
		</dependency>

		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.7.26</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.26</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<build>
		<finalName>spring3-job</finalName>

		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.8.0</version>
				<configuration>
					<source>${project.compile.version}</source>
					<target>${project.compile.version}</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
			<!-- 打包时跳过单元测试 -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-surefire-plugin</artifactId>
				<version>2.22.0</version>
				<configuration>
					<skipTests>true</skipTests>
				</configuration>
			</plugin>
			<!-- 打包后包含所有的依赖的jar包 -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-assembly-plugin</artifactId>
				<version>3.1.0</version>
				<configuration>
					<descriptorRefs>
						<descriptorRef>jar-with-dependencies</descriptorRef>
					</descriptorRefs>
				</configuration>
				<executions>
					<execution>
						<id>assemble-all</id> <!-- this is used for inheritance merges -->
						<phase>package</phase> <!-- bind to the packaging phase -->
						<goals>
							<goal>single</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
			<!-- 在Java8下忽略Javadoc的编译错误 -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-javadoc-plugin</artifactId>
				<version>2.10.3</version>
				<executions>
					<execution>
						<id>attach-javadocs</id>
						<goals>
							<goal>jar</goal>
						</goals>
						<configuration>
							<additionalparam>-Xdoclint:none</additionalparam>
						</configuration>
					</execution>
				</executions>
			</plugin>
		</plugins>

		<resources>
			<resource>
				<directory>src/main/resources</directory>
				<includes>
					<include>**/*.properties</include>
					<include>**/*.xml</include>
					<include>**/*.tld</include>
				</includes>
				<filtering>false</filtering> <!--这里是false，用true会报 数据库连接 错误 -->
			</resource>
			<resource>
				<directory>src/main/java</directory>
				<includes>
					<include>**/*.properties</include>
					<include>**/*.xml</include>
					<include>**/*.tld</include>
				</includes>
				<filtering>false</filtering>
			</resource>
		</resources>
	</build>
</project>

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2019-03-09 18:14
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