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spring boot 實現(xiàn)配置多個DispatcherServlet最簡單方式

更新時間：2021年01月22日 10:23:46 作者：小威架構(gòu)

這篇文章主要介紹了spring boot 實現(xiàn)配置多個DispatcherServlet最簡單方式，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧

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spring boot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(guān)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(nèi)置的那個了，如下代碼

@Autowired

private WebMvcProperties webMvcProperties;
@Autowired
private 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(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
 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(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。如有錯誤或未考慮完全的地方，望不吝賜教。

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