7_Spring_使用外部属性配置文件

￡神魔★判官ぃ 2023-09-30 19:58 13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>

![65421ae4ef45d2fbff0c6f6905481ed4.gif][]

![1015ba9396853408d13781c0a78683b2.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

![6fc6dd4bc311240751749d35b23f6e2b.png][]

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

![b94aef4a1717a29898fddf7cf853ed80.gif][]

![22a3c61de664c5faeea824eabbc7ead3.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>

![09b1d273b98a0ff68a03da17bd734ad7.gif][]

![14c626ea55f3bb31054a07f48da28b99.gif][]

3 DEBUG测试代码

![6385907e3f8208b47d7680dd5fa37b7c.png][]

[65421ae4ef45d2fbff0c6f6905481ed4.gif]: https://img-blog.csdnimg.cn/img_convert/65421ae4ef45d2fbff0c6f6905481ed4.gif
[1015ba9396853408d13781c0a78683b2.gif]: https://img-blog.csdnimg.cn/img_convert/1015ba9396853408d13781c0a78683b2.gif
[6fc6dd4bc311240751749d35b23f6e2b.png]: https://img-blog.csdnimg.cn/img_convert/6fc6dd4bc311240751749d35b23f6e2b.png
[b94aef4a1717a29898fddf7cf853ed80.gif]: https://img-blog.csdnimg.cn/img_convert/b94aef4a1717a29898fddf7cf853ed80.gif
[22a3c61de664c5faeea824eabbc7ead3.gif]: https://img-blog.csdnimg.cn/img_convert/22a3c61de664c5faeea824eabbc7ead3.gif
[09b1d273b98a0ff68a03da17bd734ad7.gif]: https://img-blog.csdnimg.cn/img_convert/09b1d273b98a0ff68a03da17bd734ad7.gif
[14c626ea55f3bb31054a07f48da28b99.gif]: https://img-blog.csdnimg.cn/img_convert/14c626ea55f3bb31054a07f48da28b99.gif
[6385907e3f8208b47d7680dd5fa37b7c.png]: https://img-blog.csdnimg.cn/img_convert/6385907e3f8208b47d7680dd5fa37b7c.png