傳統(tǒng)的web項(xiàng)目，只需要在web.xml里配置多個(gè)即可，并且支持多個(gè)url-pattern

在spring boot中，我們默認(rèn)無需配置，系統(tǒng)會(huì)自動(dòng)裝配一個(gè)，感興趣的可以看下源碼

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

里面有個(gè) DispatcherServletRegistrationBean，關(guān)鍵是這里只能指定一個(gè)path，如下的源碼截圖

如果想要指定多個(gè)，我們只能自己寫DispatcherServletRegistrationBean這個(gè)Bean了，那么系統(tǒng)就不會(huì)實(shí)例化內(nèi)置的那個(gè)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(gè)Bean，注意有一個(gè)一定要加上@Primary注解，否則啟動(dòng)會(huì)有報(bào)錯(cuò)。

如果我們系統(tǒng)有一個(gè)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(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持好吧啦網(wǎng)。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教。