傳統的web項目，只需要在web.xml里配置多個即可，并且支持多個url-pattern

在spring boot中，我們默認無需配置，系統會自動裝配一個，感興趣的可以看下源碼

org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration

里面有個 DispatcherServletRegistrationBean，關鍵是這里只能指定一個path，如下的源碼截圖

如果想要指定多個，我們只能自己寫DispatcherServletRegistrationBean這個Bean了，那么系統就不會實例化內置的那個了，如下代碼

@Autowired

private WebMvcProperties webMvcProperties;@Autowiredprivate MultipartConfigElement multipartConfig;

@Bean @Primary

public DispatcherServletRegistrationBean dispatcherServlet1(DispatcherServlet dispatcherServlet) { DispatcherServletRegistrationBean registration = new DispatcherServletRegistrationBean( dispatcherServlet, '/*'); registration.setName('dispatcherServlet1'); registration.setLoadOnStartup( this.webMvcProperties.getServlet().getLoadOnStartup()); if (this.multipartConfig != null) { registration.setMultipartConfig(this.multipartConfig); } return registration;}

@Bean

public DispatcherServletRegistrationBean dispatcherServlet2(DispatcherServlet dispatcherServlet) { DispatcherServletRegistrationBean registration = new DispatcherServletRegistrationBean( dispatcherServlet, '/aaa/*'); registration.setName('dispatcherServlet2'); registration.setLoadOnStartup( this.webMvcProperties.getServlet().getLoadOnStartup()); if (this.multipartConfig != null) { registration.setMultipartConfig(this.multipartConfig); } return registration;}

@Bean

public DispatcherServletRegistrationBean dispatcherServlet3(DispatcherServlet dispatcherServlet) { DispatcherServletRegistrationBean registration = new DispatcherServletRegistrationBean( dispatcherServlet, '/bbb/*'); registration.setName('dispatcherServlet3'); registration.setLoadOnStartup( this.webMvcProperties.getServlet().getLoadOnStartup()); if (this.multipartConfig != null) { registration.setMultipartConfig(this.multipartConfig); } return registration;}

這樣我們參考底層源碼，我們做了三個Bean，注意有一個一定要加上@Primary注解，否則啟動會有報錯。

如果我們系統有一個接口url是/api/test，那么通過/aaa/api/test或者/bbb/api/test也都可以訪問了。

不建議的寫法、、、

@Bean public ServletRegistrationBean apiDispatcherServlet(){ AnnotationConfigWebApplicationContext applicationContext = new AnnotationConfigWebApplicationContext(); applicationContext.scan('com.be.edge.asset.web.api'); DispatcherServlet apiDispatcherServlet = new DispatcherServlet(applicationContext); ServletRegistrationBean registrationBean = new ServletRegistrationBean(apiDispatcherServlet); registrationBean.addInitParameter('throwExceptionIfNoHandlerFound', 'true'); registrationBean.setLoadOnStartup(1); registrationBean.addUrlMappings('/api/*'); registrationBean.setName('apiDispatcherServlet'); return registrationBean; } @Bean public ServletRegistrationBean mgmtDispatcherServlet(){ AnnotationConfigWebApplicationContext applicationContext = new AnnotationConfigWebApplicationContext(); applicationContext.scan('com.be.edge.asset.web.controller'); DispatcherServlet apiDispatcherServlet = new DispatcherServlet(applicationContext); ServletRegistrationBean registrationBean = new ServletRegistrationBean(apiDispatcherServlet); registrationBean.setLoadOnStartup(2); registrationBean.addInitParameter('throwExceptionIfNoHandlerFound', 'true'); registrationBean.addUrlMappings('/mgmt/*'); registrationBean.setName('mngDispatcherServlet'); return registrationBean; }

以上為個人經驗，希望能給大家一個參考，也希望大家多多支持好吧啦網。如有錯誤或未考慮完全的地方，望不吝賜教。