springboot启动时不加载数据库

项目中引用了mongo驱动

        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-mongodb</artifactId>
            <version>1.9.0.RELEASE</version><!--$NO-MVN-MAN-VER$-->
        </dependency>
        <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongo-java-driver</artifactId>
            <version>3.6.0</version>
        </dependency>

启动时出现报错信息

com.mongodb.MongoSocketOpenException: Exception opening socket
   at com.mongodb.connection.SocketStream.open(SocketStream.java:62)
   at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:126)
   at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114)
   at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: Connection refused: connect
   at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
   at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
   at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java

原因

spring boot默认会加载
org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration类，
DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean。
因为工程中没有关于dataSource相关的配置信息，当spring创建dataSource bean因缺少相关的信息就会报错。
例如：
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class})

解决方法

同理：mongo启动时 org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration

在Application类上增加：
@EnableAutoConfiguration(exclude{MongoAutoConfiguration.class})

完