springboot 添加 filter ，继承 spring 过滤器 OncePerRequestFilter

一、 继承 spring 过滤器 OncePerRequestFilter 实现自定义过滤器

@Configuration
public class EncodeFilter extends OncePerRequestFilter {
    private String encoding = "UTF-8";
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
                                    FilterChain filterChain) throws IOException, ServletException {

        (encoding);
        (request, response);
    }
}

OncePerRequestFilter，确保在一次请求中只通过一次filter

OncePerRequestFilter 详解参考：/shanshouchen/archive/2012/07/31/

二、其他添加filter方式(implements Filter，@WebFilter)

请参考：/p/05c8be17c80a