WebServer (Spring Boot API)

所有已知实现类:
JettyWebServer, NettyWebServer, TomcatWebServer, UndertowServletWebServer, UndertowWebServer
```
public interface WebServer
```
Simple interface that represents a fully configured web server (for example Tomcat, Jetty, Netty). Allows the server to be started and stopped.
从以下版本开始:
2.0.0

- 方法概要
  所有方法实例方法抽象方法
  修饰符和类型方法说明
  int getPort()
  Return the port this server is listening on.
  void start()
  Starts the web server.
  void stop()
  Stops the web server.

- 方法详细资料
  - start
```
void start()
    throws WebServerException
```
    Starts the web server. Calling this method on an already started server has no effect.
    抛出:
    WebServerException - if the server cannot be started
  - stop
```
void stop()
   throws WebServerException
```
    Stops the web server. Calling this method on an already stopped server has no effect.
    抛出:
    WebServerException - if the server cannot be stopped
  - getPort
```
int getPort()
```
    Return the port this server is listening on.
    返回:
    the port (or -1 if none)