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  • spring boot 配置多个DispatcherServlet

    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;
    @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;
    }
    

    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;
        }
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  • 原文地址:https://www.cnblogs.com/exmyth/p/14311075.html
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