Sets the filter’s {@link #setFilterConfig filterConfig} and then immediately calls {@link #onFilterConfigSet() onFilterConfigSet()} to trigger any processing a subclass might wish to perform.
设置过滤器的{@link #setFilterConfig filterConfig}，然后立即调用{@link #onFilterConfigSet() onFilterConfigSet()}来触发子类可能希望执行的任何处理。

    public final void init(FilterConfig filterConfig) throws ServletException {
    
    
        setFilterConfig(filterConfig);
        try {
    
    
            onFilterConfigSet();
        } catch (Exception e) {
    
    
            if (e instanceof ServletException) {
    
    
                throw (ServletException) e;
            } else {
    
    
                if (log.isErrorEnabled()) {
    
    
                    log.error("Unable to start Filter: [" + e.getMessage() + "].", e);
                }
                throw new ServletException(e);
            }
        }
    }

onFilterConfigSet()

Template method to be overridden by subclasses to perform initialization logic at start-up.
模板方法，由子类重写，以在启动时执行初始化逻辑。

The
* {@code ServletContext} and {@code FilterConfig} will be accessible
* (and non-{@code null}) at the time this method is invoked via the
* {@link #getServletContext() getServletContext()} and {@link #getFilterConfig() getFilterConfig()}
* methods respectively.
当通过{@link #getServletContext() getServletContext()}和{@link #getFilterConfig() getFilterConfig()}方法调用此方法时，{@code ServletContext}和{@code FilterConfig}将是可访问的(和非{@code null})。

{@code init-param} values may be conveniently obtained via the {@link #getInitParam(String)} method.
{@code init-param}值可以通过{@link #getInitParam(String)}方法方便地获得。

  protected void onFilterConfigSet() throws Exception {
    
    
    }

总的来说，这个抽象类可以做的事情是：
1、设置FilterConfig，并且设置ServletContext
2、获取FilterConfig
3、获取init-param ？
4、做初始化？

Spring----apache.shiro--过滤器Filter---AbstractFilter抽象类

onFilterConfigSet()

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