servlet Filter 过滤器

public class AuthFilter implements Filter {

private String encoding = null;
public void destroy() {

//第三步

}

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
FilterChain filterChain) throws IOException, ServletException {

//第二步

}

public void init(FilterConfig filterConfig) throws ServletException {

//第一步,上次面试的时候进被问FILTER 怎么接受参数, 回家查了下知道原来在这里可以获取WEB.XML设置的参数
this.encoding = filterConfig.getInitParameter("encoding");
}

<[b]filter>[/b]

<[b]filter-name>[/b]EncodingFilter</[b]filter-name>[/b]

<[b]filter-class>[/b]com.logcd.filter.EncodingFilter</[b]filter-class>[/b]

<init-param>

<param-name>encoding</param-name>

<param-value>gb2312</param-value>

</init-param>

</[b]filter>[/b]

<[b]filter-mapping>[/b]

<[b]filter-name>[/b]EncodingFilter</[b]filter-name>[/b]

<url-pattern>/*</url-pattern>

</[b]filter-mapping>[/b]