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spring boot 實(shí)現(xiàn)配置多個(gè)DispatcherServlet最簡單方式

更新時(shí)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(shí)現(xiàn)配置多個(gè)DispatcherServlet最簡單方式，具有很好的參考價(jià)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(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)就不會實(shí)例化內(nèi)置的那個(gè)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(gè)Bean，注意有一個(gè)一定要加上@Primary注解，否則啟動(dòng)會有報(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腳本之家。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教。

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