7_Spring_使用外部属性配置文件

叁歲伎倆 2023-09-27 15:19 86阅读 0赞

spring容器可以读取.properties属性配置文件,可以将文件中的信息注入给bean

例如,引入Druid数据源,配置连接池信息

1 导入Druid依赖和mysql-connector依赖

<dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.10</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.22</version>
            </dependency>

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![1f3662454dd34d6c913b9b4e6e6e7188.gif][]

2 准备属性配置文件

resources目录下准备一个jdbc.properties属性配置文件

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配置文件内容

jdbc_driver=com.mysql.cj.jdbc.Driver
    jdbc_url=jdbc:mysql://127.0.0.1:3306/mydb?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    jdbc_username=root
    jdbc_password=root

![890b6ace85597aadc974d92809e2c9c6.gif][]

![81478ae93ba2c6070a2ee2e9ff4eb765.gif][]

applicationContext中添加context名称空间 并读取属性配置文件

配置druid数据源将属性配置文件中的信息注入到连接池中

<?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:c="http://www.springframework.org/schema/c"
           xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
    ">
        <context:property-placeholder location="classpath:jdbc.properties"/>
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
            <property name="username" value="${jdbc_username}"></property>
            <property name="password" value="${jdbc_password}"></property>
            <property name="url" value="${jdbc_url}"></property>
            <property name="driverClassName" value="${jdbc_driver}"></property>
        </bean>
    </beans>

![7ffd5fd38bc184070c52a6be2b339f2f.gif][]

![91b0a5c540d92937f54f55c434c21994.gif][]

3 DEBUG测试代码

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[1b5a1146f4a75f845764ddee81a367dd.gif]: https://img-blog.csdnimg.cn/img_convert/1b5a1146f4a75f845764ddee81a367dd.gif
[1f3662454dd34d6c913b9b4e6e6e7188.gif]: https://img-blog.csdnimg.cn/img_convert/1f3662454dd34d6c913b9b4e6e6e7188.gif
[f234fcd4f2175dba7a972443b968adc7.png]: https://img-blog.csdnimg.cn/img_convert/f234fcd4f2175dba7a972443b968adc7.png
[890b6ace85597aadc974d92809e2c9c6.gif]: https://img-blog.csdnimg.cn/img_convert/890b6ace85597aadc974d92809e2c9c6.gif
[81478ae93ba2c6070a2ee2e9ff4eb765.gif]: https://img-blog.csdnimg.cn/img_convert/81478ae93ba2c6070a2ee2e9ff4eb765.gif
[7ffd5fd38bc184070c52a6be2b339f2f.gif]: https://img-blog.csdnimg.cn/img_convert/7ffd5fd38bc184070c52a6be2b339f2f.gif
[91b0a5c540d92937f54f55c434c21994.gif]: https://img-blog.csdnimg.cn/img_convert/91b0a5c540d92937f54f55c434c21994.gif
[b5e36ee9e63eea660e3f60a00a1ccbb0.png]: https://img-blog.csdnimg.cn/img_convert/b5e36ee9e63eea660e3f60a00a1ccbb0.png