<!-- JDBC配置 -->

    <context:property-placeholder location="classpath:mybatis/db.properties"

        ignore-unresolvable="true" />

    <!-- 微信公众号信息 -->

    <context:property-placeholder

        location="classpath:wechat/official-account.properties"

        ignore-unresolvable="true" />

    <!-- 触发器表达式 -->

    <context:property-placeholder

        location="classpath:wechat/cron-expression.properties"

        ignore-unresolvable="true" />

    <!-- 其他配置（分页尺寸、访问频率等） -->

    <context:property-placeholder

        location="classpath:wechat/other.properties"

        ignore-unresolvable="true" />

# db.properties

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/demo?characterEncoding=UTF-8&useUnicode=true&useSSL=false&allowMultiQueries=true

jdbc.username=root

jdbc.password=root

@Controller

public class DepartmentController {

    @Value("${jdbc.password}")

    private String a;

    // Others ignore

}