SpringBoot怎么整合Filter

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SpringBoot 整合Filter

一、创建基础SpringBoot项目，集成Web即可

org.springframework.bootspring-boot-starter-web

二、方式一：通过注解方式注入

1. 创建Filter组件

com.zhl.springbootweb.filter.FirstFilter

• urlPatterns 可以指定后缀 或者 URL

• 实现@WebFilter注解

• 集成javax.servlet中的 Filter

package com.zhl.springbootweb.filter;import javax.servlet.*;import javax.servlet.annotation.WebFilter;import java.io.IOException;/*整合Filter方式一*///@WebFilter(filterName = "first Filter",urlPatterns = {"*.do","*.jsp"})@WebFilter(filterName = "first Filter",urlPatterns = {"/first"})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First Filter");/*放行*/        filterChain.doFilter(servletRequest,servletResponse);        System.out.println("离开First Filter");    }@Override    public void destroy() {    }}

2. 启动类需要添加注解

@ServletComponentScan

@SpringBootApplication/*在SpringBoot启动时会扫描@WebServlet,@WebFilter注解，并将该类实例化*/@ServletComponentScanpublic class SpringbootWebApplication {    public static void main(String[] args) {        SpringApplication.run(SpringbootWebApplication.class, args);    }}

3.测试

访问localhost:8080/first

进入First FilterFirst Servlet离开First Filter

三、方式二：使用方法注入

1. 创建Filter

com.zhl.springbootweb.filter.SecondFilter

package com.zhl.springbootweb.filter;import javax.servlet.*;import java.io.IOException;/** 整合Filter 方式二* */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");/*放行*/        filterChain.doFilter(servletRequest,servletResponse);        System.out.println("离开SecondFilter");    }@Override    public void destroy() {    }}

2.创建配置类

/*Filter 配置类*/@Configurationpublic class FilterConfig {@Bean    public FilterRegistrationBean getFilterRegistrationBean(){        FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());//bean.addUrlPatterns(new String[]{"*.do","*.jsp"});        bean.addUrlPatterns("/second");return bean;    }}

3.测试

访问 http://localhost:8080/second

进入SecondFilterSecond Servlet离开SecondFilter

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