quartz achieve regular cleaning garbage picture upload pictures produced

1, first resolve what, upload pictures in two steps

1. After the first upload to submit to the background, save succeeds, it returns a path
2. The second submission is submitted with the image path and other background information to save

Thus, after the successful implementation of the first step, the second step occurs when for some reason can not submit, then the first step to upload pictures useless, this time for garbage pictures, these pictures there is no need to continue save

2, for the above case, the design program as follows:
(The following schemes include only when the path [], and other additional information stored, the other, such as edit, delete, by analogy to the actual situation)

Create a maven project, not to the Baidu

1. Brief quartz and cros expressions
   Quartz is an open source project Job scheduling (Scheduling) field, Quartz can be used alone can also be integrated with the use of spring framework, generally use the latter in the actual development. Quartz can be used to develop one or more regular tasks, each timing task execution time can be specified individually, for example, executed once every hour, once a month performed the first day 10:00, 17:00 on the last day of each month such as the implementation of a
   cros expression:? * * * * 0/10, Baidu will be able to know the specific learning online can
   cros expression generated online

2. Join maven dependence

		<dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz</artifactId>
            <version>2.2.1</version>
        </dependency>
        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz-jobs</artifactId>
            <version>2.2.1</version>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.9.0</version>
        </dependency>

3. Web.xml configuration file

	 <!-- 加载spring容器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

4. Create a spring configuration file
   (1) applicationContext-redis.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:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                         http://www.springframework.org/schema/beans/spring-beans.xsd
        				http://www.springframework.org/schema/mvc
                          http://www.springframework.org/schema/mvc/spring-mvc.xsd
        				http://code.alibabatech.com/schema/dubbo
                          http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        				http://www.springframework.org/schema/context
                          http://www.springframework.org/schema/context/spring-context.xsd">

    <!--Jedis连接池的相关配置-->
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal">
            <value>200</value>
        </property>
        <property name="maxIdle">
            <value>50</value>
        </property>
        <property name="testOnBorrow" value="true"/>
        <property name="testOnReturn" value="true"/>
    </bean>
    <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
        <constructor-arg name="poolConfig" ref="jedisPoolConfig" />
        <constructor-arg name="host" value="192.168.1.19" />
        <constructor-arg name="port" value="6379" type="int" />
        <constructor-arg name="timeout" value="30000" type="int" />
    </bean>
</beans>

（2）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:context="http://www.springframework.org/schema/context"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
							http://www.springframework.org/schema/beans/spring-beans.xsd
							http://www.springframework.org/schema/mvc
							http://www.springframework.org/schema/mvc/spring-mvc.xsd
							http://code.alibabatech.com/schema/dubbo
							http://code.alibabatech.com/schema/dubbo/dubbo.xsd
							http://www.springframework.org/schema/context
							http://www.springframework.org/schema/context/spring-context.xsd">
    <!--开启spring注解使用-->
    <context:annotation-config></context:annotation-config>
    <!--注册自定义Job-->
    <bean id="clearImgJob" class="com.zeny.jobs.ClearImgJob"></bean>

    <bean id="jobDetail"
          class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <!-- 注入目标对象 -->
        <property name="targetObject" ref="clearImgJob"/>
        <!-- 注入目标方法 -->
        <property name="targetMethod" value="clearImg"/>
    </bean>
    <!-- 注册一个触发器，指定任务触发的时间 -->
    <bean id="myTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
        <!-- 注入JobDetail -->
        <property name="jobDetail" ref="jobDetail"/>
        <!-- 指定触发的时间，基于Cron表达式 -->
        <property name="cronExpression">
            <!--
            <value>0 0 2 * * ?</value>
            -->
            <value>0/30 * * * * ?</value>
        </property>
    </bean>
    <!-- 注册一个统一的调度工厂，通过这个调度工厂调度任务 -->
    <bean id="scheduler" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <!-- 注入多个触发器 -->
        <property name="triggers">
            <list>
                <ref bean="myTrigger"/>
            </list>
        </property>
    </bean>
</beans>

5. Creating clearImgJob

package com.zeny.jobs;

import com.zeny.constant.RedisConstant;
import com.zeny.util.QiniuUtils;
import org.springframework.beans.factory.annotation.Autowired;
import redis.clients.jedis.JedisPool;
import java.util.Set;
public class ClearImgJob {

    @Autowired
    private JedisPool jedisPool;

    public void clearImg() {
        //sdiff(大集合,小集合) 计算差值
        Set<String> set = jedisPool.getResource().sdiff(RedisConstant.SETMEAL_PIC_RESOURCES, RedisConstant.SETMEAL_PIC_DB_RESOURCES);
        if (set != null) {
            for (String picName : set) {
                //删除七牛云服务器的图片
                QiniuUtils.deleteFileFromQiniu(picName);
                //从Redis集合中删除图片的名称
                jedisPool.getResource().srem(RedisConstant.SETMEAL_PIC_RESOURCES, picName);
                System.out.println("定时删除垃圾图片: " + picName);
            }
        }
    }
}

Redis constants categories:

public class RedisConstant {
    //图片所有图片名称
    public static final String SETMEAL_PIC_RESOURCES = "setmealPicResources";
    //图片保存在数据库中的图片名称
    public static final String SETMEAL_PIC_DB_RESOURCES = "setmealPicDbResources";
}

6. Get
   
7. Analysis
   after the first picture upload is successful, the return path Image name (Image name is not repeated) into Redis, the constant is the Redis class SETMEAL_PIC_RESOURCESin
   second successful save the information after the image name into Redis, that Redis is a constant class SETMEAL_PIC_DB_RESOURCES, the calculation of the difference, that is rubbish pictures, regularly delete