Spring 通过maven pom文件配置初始化

spring对bean的生命周期管理的比较精细,并不是单纯的new()实例化.

　　1,找到class配置信息并将其实例化

　　2,受用依赖注入,按照配置信息,配置bean的所有属性;

在一个开始使用前可以用配置初始化一些参数.

方法一:用注解@PostConstruct,也就是相当于init-method

package com.weitoo.server.task;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;

import org.springframework.stereotype.Component;

import com.qianmi.open.api.DefaultOpenClient;
import com.qianmi.open.api.OpenClient;
import com.weitoo.server.mapper.PropertyMapper;

/**
 * 授权和充值消息推送父类
 *
 * @author 钟政 暂时将这些字段值写死
 */
@Component
public class BaseTask {
    @Resource
    private  PropertyMapper propertyMapper;

    private static String API_URL = "";

    protected static String APP_KEY = "";

    protected static String APP_SECRET = "";

    protected  static String accessToken = "";
    protected  static  String refreshToken = "";
    // 创建一个客户端，默认连接超时时间为3秒，请求超时时间为15秒。
    protected static OpenClient client = new DefaultOpenClient(API_URL, APP_KEY, APP_SECRET);

    //方法二:是利用spring实例化和注入依赖后会执行的注解.
    @PostConstruct
    private void initMethod(){
        if("".equals(accessToken)){
            accessToken = propertyMapper.getValue("access_token").getData();
        }
        if("".equals(refreshToken)){
            refreshToken = propertyMapper.getValue("refresh_token").getData();
        }
        if("".equals(APP_KEY)){
            APP_KEY=propertyMapper.getValue("app_key").getData();
        }
        if("".equals(APP_SECRET)){
            APP_SECRET=propertyMapper.getValue("app_secret").getData();
        }
        API_URL=propertyMapper.getValue("api_url").getData();
        //
        client = new DefaultOpenClient(API_URL, APP_KEY, APP_SECRET);
    }

}

上面的方式是通过数据库配置一些初始化参数.

方法二:通过spring-config 直接配置.所配置的属性必须有set方法

　　如果是想从maven中的pom.xml文件中获取,需要中间文件*.properties文件.

如获取pom属性如下

    <properties>

        <wxpay-scanpay-scancode-url>https://api.mch.weixin.qq.com/pay/unifiedorder</wxpay-scanpay-scancode-url>

        <wxpay-scanpay-pay-api-url>https://api.mch.weixin.qq.com/pay/micropay</wxpay-scanpay-pay-api-url>

        <wxpay-scanpay-pay-query-url>https://api.mch.weixin.qq.com/pay/orderquery</wxpay-scanpay-pay-query-url>

        <wxpay-scanpay-refund-url>https://api.mch.weixin.qq.com/secapi/pay/refund</wxpay-scanpay-refund-url>

        <wxpay-scanpay-refund-query-url>https://api.mch.weixin.qq.com/pay/refundquery</wxpay-scanpay-refund-query-url>

        <wxpay-scanpay-reverse-api-url>https://api.mch.weixin.qq.com/secapi/pay/reverse</wxpay-scanpay-reverse-api-url>

        <wxpay-scanpay-download-bill-url>https://api.mch.weixin.qq.com/pay/downloadbill</wxpay-scanpay-download-bill-url>

        <wxpay-scanpay-report-api-url>https://api.mch.weixin.qq.com/payitil/report</wxpay-scanpay-report-api-url>

    </properties>

*.properties的文件如下:wxpay.properties

scanpay.scancode.url=${wxpay-scanpay-scancode-url}
scanpay.pay.api.url=${wxpay-scanpay-pay-api-url}

scanpay.pay.query.url =${wxpay-scanpay-pay-query-url}
scanpay.refund.url=${wxpay-scanpay-refund-url}

scanpay.refund.query.url=${wxpay-scanpay-refund-query-url}

scanpay.reverse.api.url=${wxpay-scanpay-reverse-api-url}
scanpay.download.bill.url=${wxpay-scanpay-download-bill-url}
scanpay.report.api.url=${wxpay-scanpay-report-api-url}

在spring-config.xml关键配置如下:

    <bean id="propertyConfigurer" class="com.weitoo.server.security.SecurityPropertyConfigurer">
        <property name="locations">
            <list>

                <!-- 微信支付初始化参数 -->
                <value>classpath:property/wxpay.properties</value>
            </list>
        </property>
        <property name="ignoreUnresolvablePlaceholders" value="true" />
    </bean>

　　其中com.weitoo.server.security.SecurityPropertyConfigurer类是继承了org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.直接用PropertyPlaceholderConfigurer类也行.主要是解析properties文件

　　spring-config.xml  初始化类参数如下,ps:scope="singleton" 代表该类生命周期属于spring管理.

<bean id="configure" class = "com.tencent.common.Configure" scope="singleton">

            <property name="REFUND_API" value="${scanpay.refund.url}"/>
            <property name="REFUND_QUERY_API" value="${scanpay.refund.query.url}"/>
            <property name="REVERSE_API" value="${scanpay.reverse.api.url}"/>
            <property name="DOWNLOAD_BILL_API" value="${scanpay.download.bill.url}"/>
            <property name="REPORT_API" value="${scanpay.report.api.url}"/>
    </bean>