spring-boot自定义启动端口

spring boot本身内置tomcat,我们一般只需要引入tomcat的依赖即可.

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
</dependency>

但是默认的端口有可能被占用了，提示如下信息

Description:

The Tomcat connector configured to listen on port 8080 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector's configuration, identify and stop any process that's listening on port 8080, or configure this application to listen on another port.

别急，我们可以自定义端口，有三种方法：
1.在配置文件中设置:

使用application.properties

server.port=8888
使用application.yml

server:
  port: 8888

2. 直接自定义ConfigurableEmbeddedServletContainer.通过自己注册TomcatEmbeddedServletContainerFactory，
   JettyEmbeddedServletContainerFactory或UndertowEmbeddedServletContainerFactory

@Bean
public EmbeddedServletContainerFactory servletContainer() {
    TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();
    factory.setPort(9000);
    factory.setSessionTimeout(10, TimeUnit.MINUTES);
    factory.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/notfound.html");
    return factory;
}

3. Spring boot中自定义端口需要入口类实现ConfigurableEmbeddedServletContainer接口.如下代码

@RestController
@EnableAutoConfiguration
public class CustomPortController implements EmbeddedServletContainerCustomizer {
    /**
     * 自定义端口
     * @param container
     */
    public void customize(ConfigurableEmbeddedServletContainer container) {
        container.setPort(8888);
    }

    @RequestMapping("/")
    public String setPort(){
        return "自定义端口:8888";
    }

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