SpringBoot添加过滤器

方式一（不可排序）

1. 新建过滤器实现javax.servlet.Filter.
2. 应用添加@ServletComponentScan.
3. 过滤器添加注解@WebFilter(name, urlPattern).

方式二（可排序）

1. 新建过滤器实现javax.servlet.Filter.
2. 新建配置类并注入FilterRegistrationBean,使用该对象的setOrder()，addUrlPattern()等方法实现。                                                                                                                 

应用启动

package com.guofengzhi.helloworld;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication
//@ServletComponentScan方式一添加
public class HelloworldApplication {

    public static void main(String[] args) {

        SpringApplication.run(HelloworldApplication.class, args);
    }

}

过滤器类

package com.guofengzhi.helloworld.filter;

import org.springframework.core.annotation.Order;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

//@WebFilter(filterName = "a", urlPatterns = "/*")方式一需要添加，方式二不需要

public class AFilter implements Filter { 

　　@Override 
　　public void init(FilterConfig filterConfig) throws ServletException { 
　　　　System.out.println("init a filter..."); 
　　} 

　　@Override 
　　public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { 
　　　　System.out.println("do a filter..."); 
　　　　filterChain.doFilter(servletRequest, servletResponse); 
　　} 

　　@Override 
　　public void destroy() { 
　　　　System.out.println("destory a filter..."); 
　　} 
}

FilterRegistrationBean配置类

package com.guofengzhi.helloworld.filter;

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FilterRegistrationBeanConf {

    @Bean
    public FilterRegistrationBean<AFilter> aFilter() {
        FilterRegistrationBean<AFilter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(new AFilter());
        filterRegistrationBean.setOrder(1);
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean<BaseFilter> baseFilter() {
        FilterRegistrationBean<BaseFilter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(new BaseFilter());
        filterRegistrationBean.setOrder(2);
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean<WorkFilter> workFilter() {
        FilterRegistrationBean<WorkFilter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(new WorkFilter());
        filterRegistrationBean.setOrder(3);
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean<CompleteFilter> completeFilter() {
        FilterRegistrationBean<CompleteFilter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(new CompleteFilter());
        filterRegistrationBean.setOrder(4);
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }
}