spring boot 实现配置多个DispatcherServlet最简单方式

传统的web项目，只需要在web.xml里配置多个即可，并且支持多个url-pattern

在spring boot中，我们默认无需配置，系统会自动装配一个，感兴趣的可以看下源码

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

里面有个 DispatcherServletRegistrationBean，关键是这里只能指定一个path，如下的源码截图

如果想要指定多个，我们只能自己写DispatcherServletRegistrationBean这个Bean了，那么系统就不会实例化内置的那个了，如下代码

@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;}

这样我们参考底层源码，我们做了三个Bean，注意有一个一定要加上@Primary注解，否则启动会有报错。

如果我们系统有一个接口url是/api/test，那么通过/aaa/api/test或者/bbb/api/test也都可以访问了。

不建议的写法、、、

@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; }

以上为个人经验，希望能给大家一个参考，也希望大家多多支持好吧啦网。如有错误或未考虑完全的地方，望不吝赐教。