28. 代码实例-spring组件配置化-使用注解

spring的核心思想就是程序整体松耦合的组件化，每个组件可以通过修改配置来改变参数，适合做配置参数的是指在程序运行中不随意改变的参数，改变后一般需要重启程序（如线程数）。一般通过xml，在使用注解时，想要通过修改配置来改变参数，就需要利用配置文件。

（1）spring配置

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="   
   http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd   
   http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd   
   http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd   
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd    
http://www.springframework.org/schema/util classpath:/org/springframework/beans/factory/xml/spring-util-3.0.xsd
 "
    default-autowire="byName">
    <context:component-scan base-package="com.jd.consume.*" />
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:important.properties</value>
                <value>classpath:important2.properties</value>
            </list>
        </property>
        <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"></property>
    </bean>
    <bean id="springContextHolder" class="com.jd.consume.web.SpringContextHolder" lazy-init="false" />
    <import resource="classpath:spring/spring-config-db-consume.xml" />
    <import resource="classpath:spring/spring-config-db-jd2008.xml" />
    <import resource="classpath:spring/spring-config-user-rpc.xml" />
    <import resource="classpath:spring/spring-config-mail-rpc.xml" />
    <import resource="classpath:spring/spring-config-msg-new.xml" />
    <import resource="classpath:spring/spring-config-db-mysql.xml" />
    <import resource="classpath:spring/spring-config-db-mysql1.xml" />
    <import resource="classpath:spring/spring-config-db-mysql2.xml" />
    <import resource="classpath:spring/spring-config-db-mysql3.xml" />
    <import resource="classpath:spring/spring-config-db-mysql4.xml" />

</beans>

2）属性配置

     important.properties

     ##lock

addConsumeLock.maxLockSize=2

addConsumeLock.getSize=4

pastConsumeLock.maxLockSize=2

pastConsumeLock.getSize=4

gradeLock.maxLockSize=2

gradeLock.getSize=4

##thread

addConsumeJob.threadSize=2

pastConsumeJob.threadSize=1

gradeJob.threadSize=2

（3）代码中

package com.jd.consume.service.lock.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import com.jd.consume.domain.OrderTask;

/**
 * 加消费额度锁定
 * @author guanpanpan
 *
 */
@Service(value = "addConsumeLock")
public class AddConsumeLock extends DataLockImpl {

    @Override
    @Value("${addConsumeLock.getSize}")
    public void setGetSize(int getSize) {
        super.setGetSize(getSize);
    }

    @Override
    @Value("${addConsumeLock.maxLockSize}")
    public void setMaxLockSize(int maxLockSize) {
        super.setMaxLockSize(maxLockSize);
    }

    @Override
    public boolean lockSingleData(int dbNo,long id) {
        return orderTaskDaoMysql.updateStatus(dbNo,id, OrderTask.SYN_LOCK, OrderTask.SYN_WAIT) == 1;
    }

    @Override
    public int unLock(int dbNo,long id) {
        return orderTaskDaoMysql.updateStatus(dbNo,id, OrderTask.SYN_WAIT, OrderTask.SYN_LOCK);
    }

    @Override
    public List<OrderTask> getData(int dbNo) {
        List<OrderTask> orderTasks = orderTaskDaoMysql.findOrderTasksByConsumeStatus(dbNo,OrderTask.SYN_WAIT, getSize, false);
        return orderTasks;
    }

    @Override
    public int unLockAll(int dbNo) {
        return orderTaskDaoMysql.updateStatus(dbNo,OrderTask.SYN_WAIT, OrderTask.SYN_LOCK);
    }
}