Spring boot在添加mongo java驱动程序maven依赖项时尝试连接到mongo

我刚才补充说：

    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongo-java-driver</artifactId>
    </dependency>

出于某种原因，当我使用

mvn clean package

spring boot现在尝试连接到mongodb时：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.7.RELEASE)

2019-10-11 20:36:58.418  INFO 14870 --- [           main] hello.GreetingControllerTests            : Starting GreetingControllerTests on user-ThinkPad-X390 with PID 14870 (started by user in /home/user/repos/frontend-backend/backend)
2019-10-11 20:36:58.423  INFO 14870 --- [           main] hello.GreetingControllerTests            : No active profile set, falling back to default profiles: default
2019-10-11 20:36:59.311  INFO 14870 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-10-11 20:36:59.565  INFO 14870 --- [           main] org.mongodb.driver.cluster               : Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2019-10-11 20:36:59.591  INFO 14870 --- [localhost:27017] org.mongodb.driver.cluster               : Exception in monitor thread while connecting to server localhost:27017

com.mongodb.MongoSocketOpenException: Exception opening socket
    at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:67) ~[mongo-java-driver-3.8.2.jar:na]
    at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:126) ~[mongo-java-driver-3.8.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:117) ~[mongo-java-driver-3.8.2.jar:na]
    at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:na]
    at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399) ~[na:na]

如果我只是删除测试或mongo依赖项，则不会启动上述mongo连接

---

但是在上面的测试中没有提到mongo，那么spring为什么要尝试启动mongo连接呢？

如果我必须用一句话来回答，这是因为Springboot是自以为是的。当它通过

自动配置

类注意到pom中的mongo依赖时，它将尝试连接到mongo

如果您想覆盖默认行为并告诉Springboot不要进行MongoutoConfiguration，那么您可以这样做

@SpringBootApplication(exclude=MongoAutoConfiguration.class)
public class YourMainApplication {

    public static void main(String[] args) {
        SpringApplication.run(TestApplication.class, args);
    }
}

@TestPropertySource(properties=
{"spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration"})
@SpringBootTest
public class GreetingControllerTests {...}

或者，您可以使用属性文件中的这一行执行此操作

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration

如果您执行上述任一操作，那么它将从应用程序中排除MongoutoConfiguration（而不仅仅是从测试中）。这意味着，当您启动应用程序时，您没有访问mongo的权限（如果这是您想要的）

由于

SpringbootTest

注释加载整个应用程序上下文，因此它会查找这个主应用程序类。如果您排除了一些自动配置，那么它将排除，即使在您的测试中也是如此。所以你不会有连接到mongo的问题

如果您希望仅在测试中排除此自动配置（以便在运行应用程序时不会更改任何内容），可以这样做

@SpringBootApplication(exclude=MongoAutoConfiguration.class)
public class YourMainApplication {

    public static void main(String[] args) {
        SpringApplication.run(TestApplication.class, args);
    }
}

@TestPropertySource(properties=
{"spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration"})
@SpringBootTest
public class GreetingControllerTests {...}