146. Spring Boot Shiro cannot access JS/CSS/IMG + custom Filter cannot access the perfect solution [Learn Spring Boot from scratch]

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Origin of need :

Some netizens said: JS/CSS/IMG cannot be accessed . In fact, this problem is particularly easy to solve for those who have used Shiro . You only need to do a simple configuration. But if you don't know Shiro , you may need help. . Haha, if you answer the same question too many times, your ears will grow calluses. Well, this blog is to solve this problem.

( 1 ) JS/CSS/IMG is intercepted by shiro

The static resources we requested for spring boot were intercepted by the shiro filter, so I think I can let shiro release it directly, that is, css:anno , img:anno , js:anno , the conversion to shiro code is:

ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean ();
filterChainDefinitionMap.put("/img/**", "anon");//img       
filterChainDefinitionMap.put("/js/**", "anon");//js
filterChainDefinitionMap.put("/css/**", "anon");//css

（2）自定义Filter导致无法访问

如果添加了上面的配置，还无法使用的，那么就看看是否是如下这种情况引起的：

在ShiroConfiguration中如果您有这么一段自定义Filter的代码：

    @Bean
    public CustomFormAuthenticationFilter formAuthenticationFilter(){
       CustomFormAuthenticationFilter customFormAuthenticationFilter = new CustomFormAuthenticationFilter();
       return customFormAuthenticationFilter;
    }

这样注入Filter的方式也是会出现JS/CSS/IMG无法访问的，这是为什么呢？

这是因为：容器把自定义的CustomFormAuthenticationFilter也作为容器的filter接管，所有的请求又都经过一次filter，那么就会导致一个问题出现：比如：我们定义 /js/**=anon,/css/**=anon, /img/ =anno，那么所有JS/CSS/IMG等资源文件也会被拦截。也就是说：我们自定义的CustomFormAuthenticationFilter和shiroFilter不再是上下级的关系了，而是平级的关系，由Spring的ApplicationFilterConfig一起管理了。

那也就是说：我们只需要修改为上下级的关系就可以了。

首先，我们就不能CustomFormAuthenticationFilter让Spring管理了，先去掉注解@Bean

第二就是：使用ShiroFilterFactoryBean进行注入，就是上下级的关系了，核心代码部分：

ShiroFilterFactoryBean shiroFilterFactoryBean  = new ShiroFilterFactoryBean();
//自定义filter.
Map<String,Filter> filters  = new HashMap<String,Filter>();
CustomFormAuthenticationFilter formAuthenticationFilter =  new CustomFormAuthenticationFilter();//初始化自定义的filter.
filters.put("authc", formAuthenticationFilter);//添加到map中.
shiroFilterFactoryBean.setFilters(filters);//交给spring shiroFilter管理

（3）问题2方案导致新问题

我们使用了new CustomFormAuthenticationFilter()的方式就无法使用spring的特性，在CustomFormAuthenticationFilter的类中就不能使用@Autowire注入别的service进行使用了。所以这里就存在了新的问题了，由不能直接使用@Bean的方式注入，那么怎么解决呢？

我们会思考是否有一种方式注册我们自定义的Filter到Spring容器中，但是又不添加Filter到FilterChain中呢？所以我们的问题也就是：怎么取消 Filter自动注册?

Spring Boot对Filter，Servlet提供了相应的注册类，来进行精细化的配置，我们可以使用注册类来取消Filter的自动注册。通过使用FilterRegistrationBean来进行Filter的注册，同时，设置enabled为false，就可以取消Filter的自动注册行为了。可以参考文档：Spring Boot Document

具体怎么操作呢？

    @Bean
    public CustomFormAuthenticationFilter customFormAuthenticationFilter(){
       System.out.println("ShiroConfiguration.formAuthenticationFilter()");
       CustomFormAuthenticationFilter customFormAuthenticationFilter = new CustomFormAuthenticationFilter();
       return customFormAuthenticationFilter;
    }
 
    @Bean
    public FilterRegistrationBean registrationBean(CustomFormAuthenticationFilter customFormAuthenticationFilter){
       System.out.println("AppcustomFormAuthenticationFilter()");
       FilterRegistrationBean registration = new FilterRegistrationBean(customFormAuthenticationFilter);
        registration.setEnabled(false);//怎么取消  Filter自动注册,不会添加到FilterChain中.
        return registration;
    }

这里还是使用@Bean注入CustomFormAuthenticationFilter，但是在自动注入之后使用FilterRegistrationBean对其重新进行了设置，取消自动注册功能。这里容易犯错的地方就是CustomFormAuthenticationFilter不使用@Bean注入了，如果是这样的话，就会发现是先shiro的配置先注入，CustomFormAuthenticationFilter还没注入就无法找到了。

视频&交流平台：

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http://412887952-qq-com.iteye.com/blog/2321532

146. Spring Boot Shiro cannot access JS/CSS/IMG + custom Filter cannot access the perfect solution [Learn Spring Boot from scratch]

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