springboot filter2种方法

第一种方法:注解

 

package com.example.demo.filter;

import org.springframework.core.annotation.Order;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

//顺序越小越先执行
@Order(1)
@WebFilter(filterName = "myfilter",urlPatterns = "/*")
/**
 * filter
 */
public class Myfilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("filter初始化");

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        System.out.println(request.getRequestURI()+"aaaaa");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

需要在启动类开启注解

@ServletComponentScan
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

 第二种方法:

 

package com.example.demo.filter;

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

import java.util.*;

@Configuration
public class TestFilter {

    @Bean
    public FilterRegistrationBean testFilterRegistrationBean(){
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new Myfilter());
        List a = new ArrayList<>();
        a.add("/*");
        registrationBean.setUrlPatterns(a);
        Map map = new HashMap<>();
        map.put("111","222");
        registrationBean.setInitParameters(map);
        registrationBean.setName("filter");
        return registrationBean;
    }
}

 

package com.example.demo.filter;

import org.springframework.core.annotation.Order;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;


public class Myfilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("filter初始化");

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        System.out.println(request.getRequestURI()+"aaaaa");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

打印为 /hahaaaaaa