spring_reference/IX. ‘How-to’ guides/64.4. Discover the HTTP por...

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### 64.4. 发现运行时的HTTP端口
你可以通过日志输出或它的EmbeddedServletContainer的EmbeddedWebApplicationContext获取服务器正在运行的端口。获取和确认服务器已经初始化的最好方式是添加一个`ApplicationListener<EmbeddedServletContainerInitializedEvent>`类型的`@Bean`然后当事件发布时将容器pull出来。
使用`@WebIntegrationTests`的一个有用实践是设置`server.port=0`,然后使用`@Value`注入实际的('local')端口。例如:
```java
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = SampleDataJpaApplication.class)
@WebIntegrationTest("server.port:0")
public class CityRepositoryIntegrationTests {
@Autowired
EmbeddedWebApplicationContext server;
@Value("${local.server.port}")
int port;
// ...
}
```