Springboot添加filter方法

在springboot添加filter有两种方式：

　　（1）、通过创建FilterRegistrationBean的方式（建议使用此种方式，统一管理，且通过注解的方式若不是本地调试，如果在filter中需要增加cookie可能会存在写不进前端情况）

　　（2）、通过注解@WebFilter的方式

一、通过创建FilterRegistrationBean的方式创建多个filter以及设置执行顺序：

　　　1、创建两个实现Filter接口的类TestFilter1 、TestFilter2

package com.aoxun.core.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

public class TestFilter1 implements Filter {

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

            throws IOException, ServletException {

        chain.doFilter(request, response);

    }

    @Override

    public void destroy() {}

}

package com.aoxun.core.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

public class TestFilter2 implements Filter {

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

            throws IOException, ServletException {

        chain.doFilter(request, response);

    }

    @Override

    public void destroy() {}

}

2、创建配置类

　　　　　　有多个filter就创建多个FilterRegistrationBean ，若需注明filter的执行顺序，可通过registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE - 1)配置，值越大，执行顺序越靠后

package com.aoxun.config.web;

import org.springframework.boot.web.servlet.FilterRegistrationBean;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import com.aoxun.core.filter.TestFilter1;

import com.aoxun.core.filter.TestFilter2;

/**

 * filter配置

 * @author zcj

 *

 */

@Configuration

public class FilterConfig2 {

    @Bean

    public FilterRegistrationBean companyUrlFilterRegister() {

        FilterRegistrationBean registration = new FilterRegistrationBean();

        //注入过滤器

        registration.setFilter(new TestFilter1());

        //拦截规则

        registration.addUrlPatterns("/*");

        //过滤器名称

        registration.setName("testFilter1");

        //过滤器顺序

        registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE);

        return registration;

    }

    @Bean

    public FilterRegistrationBean outLinkSecurityFilterRegister() {

        FilterRegistrationBean registration = new FilterRegistrationBean();

        //注入过滤器

        registration.setFilter(new TestFilter2());

        //拦截规则

        registration.addUrlPatterns("/*");

        //过滤器名称

        registration.setName("testFilter2");

        //过滤器顺序

        registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE - 1);

        return registration;

    }

}

二、通过注解@WebFilter的方式

　　　1、在启动类上增加@ServletComponentScan注解，自动扫描带有过滤器注解的包

　　　2、在类上使用@WebFilter和@Order组合实现

package com.aoxun.core.filter;

import java.io.IOException;

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 org.springframework.boot.web.servlet.FilterRegistrationBean;

import org.springframework.core.annotation.Order;

@WebFilter(filterName="testFilter1",urlPatterns= {"/*"})

@Order(FilterRegistrationBean.LOWEST_PRECEDENCE)

public class TestFilter1 implements Filter {

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

        // TODO Auto-generated method stub

    }

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

            throws IOException, ServletException {

        chain.doFilter(request, response);

    }

    @Override

    public void destroy() {

        // TODO Auto-generated method stub

    }

}

（转自：https://www.cnblogs.com/begin2016/p/8947887.html）