SpringBoot 整合Filter

一、创建基础SpringBoot项目，集成Web即可

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>

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 {

1}
2
3@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");

1}
2
3@Override

public void destroy() {

}

}

2. 启动类需要添加注解

@ServletComponentScan

1@SpringBootApplication
2/*在SpringBoot启动时会扫描@WebServlet,@WebFilter注解，并将该类实例化*/
3@ServletComponentScan
4public class SpringbootWebApplication {
5
6    public static void main(String[] args) {
7        SpringApplication.run(SpringbootWebApplication.class, args);
8    }
9
10}

3.测试

访问localhost:8080/first

1进入First Filter
2First Servlet
3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 {

1}
2
3@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");

1}
2
3@Override

public void destroy() {

}

}

2.创建配置类

/*Filter 配置类_*/_ @Configuration public 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

1进入SecondFilter
2Second Servlet
3离开SecondFilter