第springboot實(shí)現(xiàn)配置多個(gè)DispatcherServlet最簡(jiǎn)單方式傳統(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springboot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

privateWebMvcPropertieswebMvcProperties;

@Autowired

privateMultipartConfigElementmultipartConfig;

@Bean@Primary

publicDispatcherServletRegistrationBeandispatcherServlet1(DispatcherServletdispatcherServlet){

DispatcherServletRegistrationBeanregistration=newDispatcherServletRegistrationBean(

dispatcherServlet,"/*");

registration.setName("dispatcherServlet1");

registration.setLoadOnStartup(

this.webMvcProperties.getServlet().getLoadOnStartup());

if(this.multipartConfig!=null){

registration.setMultipartConfig(this.multipartConfig);

returnregistration;

}

@Bean

publicDispatcherServletRegistrationBeandispatcherServlet2(DispatcherServletdispatcherServlet){

DispatcherServletRegistrationBeanregistration=newDispatcherServletRegistrationBean(

dispatcherServlet,"/aaa/*");

registration.setName("dispatcherServlet2");

registration.setLoadOnStartup(

this.webMvcProperties.getServlet().getLoadOnStartup());

if(this.multipartConfig!=null){

registration.setMultipartConfig(this.multipartConfig);

returnregistration;

}

@Bean

publicDispatcherServletRegistrationBeandispatcherServlet3(DispatcherServletdispatcherServlet){

DispatcherServletRegistrationBeanregistration=newDispatcherServletRegistrationBean(

dispatcherServlet,"/bbb/*");

registration.setName("dispatcherServlet3");

registration.setLoadOnStartup(

this.webMvcProperties.getServlet().getLoadOnStartup());

if(this.multipartConfig!=null){

registration.setMultipartConfig(this.multipartConfig);

returnregistration;

}

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

publicServletRegistrationBeanapiDispatcherServlet(){

AnnotationConfigWebApplicationContextapplicationContext=newAnnotationConfigWebApplicationContext();

applicationContext.scan("com.be.edge.asset.web.api");

DispatcherServletapiDispatcherServlet=newDispatcherServlet(applicationContext);

ServletRegistrationBeanregistrationBean=newServletRegistrationBean(apiDispatcherServlet);

registrationBean.addInitParameter("throwExceptionIfNoHandlerFound","true");

registrationBean.setLoadOnStartup(1);

registrationBean.addUrlMappings("/api/*");

registrationBean.setName("apiDispatcherServlet");

returnregistrationBean;

@Bean

publicServletRegistrationBeanmgmtDispatcherServlet(){

AnnotationConfigWebApplicationContextapplicationContext=newAnnotationConfigWebApplicationContext();

applicationContext.scan("com.be.edge.asset.web.controller");

DispatcherServletapiDispatcherServlet=newDispatcherServlet(applicationContext);

ServletRegistrationBeanregistrationBean=newServletRegistrationBean(apiDispatcherServlet);

registrationBean.setLoadOnStartup(2);

registrationBean.addInitParameter("throwExceptionIfNoHandlerFound","true");

registr