配置日志处理

<properties>
    <slf4j.version>1.6.4</slf4j.version>
</properties>

<dependencyManagement>
    <dependencies>
        <!-- 日志处理 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>