SpringBoot过滤器使用

ゞ浴缸里的玫瑰 2022-05-24 00:11 228阅读 0赞

SpringBoot的过滤器配置起来很简单，下面是步骤。

# 一、在Application启动类上增加@ServletComponentScan注解 #

![20180516200809819][]

# 二、实现javax.servlet.Filter接口，在接口上增加@WebFilter注解 #

import javax.servlet.*;
    import javax.servlet.Filter;
    import javax.servlet.annotation.WebFilter;
    import java.io.IOException;
    
    /**
     * Created by wzj on 2018/5/16.
     */
    @WebFilter(filterName="myFilter",urlPatterns="/*")
    public class WebFilterTest implements Filter
    {
        /**
         * </ul>
         *
         * @param filterConfig The configuration information associated with the
         *                     filter instance being initialised
         * @throws ServletException if the initialisation fails
         */
        @Override
        public void init(FilterConfig filterConfig) throws ServletException
        {
    
        }
    
        /**
         *
         * @param request  The request to process
         * @param response The response associated with the request
         * @param chain    Provides access to the next filter in the chain for this
         *                 filter to pass the request and response to for further
         *                 processing
         * @throws IOException      if an I/O error occurs during this filter's
         *                          processing of the request
         * @throws ServletException if the processing fails for any other reason
         */
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
        {
            System.out.println("自定义的过滤器Filter Filter.......");
            chain.doFilter(request, response);
        }
    
        /**
         * Called by the web container to indicate to a filter that it is being
         * taken out of service. This method is only called once all threads within
         * the filter's doFilter method have exited or after a timeout period has
         * passed. After the web container calls this method, it will not call the
         * doFilter method again on this instance of the filter. <br>
         * <br>
         * <p>
         * This method gives the filter an opportunity to clean up any resources
         * that are being held (for example, memory, file handles, threads) and make
         * sure that any persistent state is synchronized with the filter's current
         * state in memory.
         */
        @Override
        public void destroy()
        {
    
        }
    }

[20180516200809819]: /images/20220524/7e0e54be92da46399b015a050f48db17.png