Spring 通過maven pom文件配置初始化

spring對bean的生命周期管理的比較精細,並不是單純的new()實例化.

　　1,找到class配置信息並將其實例化

　　2,受用依賴注入,按照配置信息,配置bean的所有屬性;

在一個開始使用前可以用配置初始化一些參數.

方法一:用注解@PostConstruct,也就是相當於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;

/**
 * 授權和充值消息推送父類
 * 
 * @author 鍾政 暫時將這些字段值寫死
 */
@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 = "";
    // 創建一個客戶端，默認連接超時時間為3秒，請求超時時間為15秒。
    protected static OpenClient client = new DefaultOpenClient(API_URL, APP_KEY, APP_SECRET);
    
    
    //方法二:是利用spring實例化和注入依賴后會執行的注解.
    @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);
    }
    
    
}

上面的方式是通過數據庫配置一些初始化參數.

方法二:通過spring-config 直接配置.所配置的屬性必須有set方法

　　如果是想從maven中的pom.xml文件中獲取,需要中間文件*.properties文件.

如獲取pom屬性如下

    <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關鍵配置如下:

    <bean id="propertyConfigurer" class="com.weitoo.server.security.SecurityPropertyConfigurer">
        <property name="locations">
            <list>
                
                <!-- 微信支付初始化參數 -->
                <value>classpath:property/wxpay.properties</value>
            </list>
        </property>
        <property name="ignoreUnresolvablePlaceholders" value="true" />
    </bean>

　　其中com.weitoo.server.security.SecurityPropertyConfigurer類是繼承了org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.直接用PropertyPlaceholderConfigurer類也行.主要是解析properties文件

　　spring-config.xml  初始化類參數如下,ps:scope="singleton" 代表該類生命周期屬於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>