spring boot 實現配置多個DispatcherServlet最簡單方式

第springboot實現配置多個DispatcherServlet最簡單方式傳統(tǒng)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springboot中，我們默認無需配置，系統(tǒng)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(tǒng)就不會實例化內置的那個了，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(tǒng)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

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