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  • SpringBoot学习3:springboot整合filter

    整合方式一:通过注解扫描完成 Filter 组件的注册

    1、编写filter

    package com.bjsxt.filter;
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import java.io.IOException;
    
    /**
     * Created by Administrator on 2019/2/4.
     */
    @WebFilter(filterName = "FirstFilter",urlPatterns = {"/first"}) //filter名字和拦截的路径
    public class FirstFilter implements Filter {
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            System.out.println("进入FirstFilter.......");
            filterChain.doFilter(servletRequest,servletResponse);
            System.out.println("离开FirstFilter.......");
        }
    
        @Override
        public void destroy() {
    
        }
    }

    2、编写启动类

    package com.bjsxt;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    
    /**
     * Created by Administrator on 2019/2/4.
     */
    @SpringBootApplication
    @ServletComponentScan   //在springboot启动时,会扫描@WebServlet、@WebFilter等,并将该类实例化
    public class App {
    
        public static void main(String[] args){
            SpringApplication.run(App.class,args);
        }
    }

    整合方式二:通过方法完成 Filter 组件的注册

    1、编写filter

    package com.bjsxt.filter;
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import java.io.IOException;
    
    /**
     * Created by Administrator on 2019/2/4.
     */
    public class SecondFilter implements Filter {
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            System.out.println("进入SecondFilter.......");
            filterChain.doFilter(servletRequest,servletResponse);
            System.out.println("离开SecondFilter.......");
        }
    
        @Override
        public void destroy() {
    
        }
    }

    2、编写启动类

    package com.bjsxt;
    
    import com.bjsxt.filter.SecondFilter;
    import com.bjsxt.servlet.SecondServlet;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    
    /**
     * Created by Administrator on 2019/2/4.
     */
    @SpringBootApplication
    public class App2 {
    
        public static void main(String[] args){
            SpringApplication.run(App2.class,args);
        }
    
        /**
         * 注册Servlet
         * @return
         */
        @Bean
        public ServletRegistrationBean getServletRegistrationBean(){
            ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
            bean.addUrlMappings("/second");
            return bean;
        }
    
        /**
         * 注册Filter
         * @return
         */
        @Bean
        public FilterRegistrationBean getFilterRegistrationBean(){
            FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
            bean.addUrlPatterns(new String[]{"/second"});
            return bean;
        }
    }
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  • 原文地址:https://www.cnblogs.com/duanrantao/p/10351768.html
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