Spring Boot 获取服务IP地址和端口号

try {
    String result = InetAddress.getLocalHost().getHostAddress();
} catch (UnknownHostException e) {
    LOGGER.error("获取IP失败", e);
}

- `@Value`注解
- `@LocalServerPort`注解
- `Environment`

我们将`@Value和@LocalServerPort`放在一起, 其实`@LocalServerPort`等价于`@Value("${local.server.port}")`:
```java
@Value("${server.port}")
int serverPort;

@LocalServerPort
int localServerPort

@Autowired
Environment environment;

public int getPort() {
    return environment.getProperty("server.port");
}