拦截器与过滤器（三）过滤器集成与使用

一、使用

1、springboot3以下

 自定义过滤器类实现Javax.serlvet.Filter接口（对应servlet-api.jar），加上Component注解可以被扫描到即可，不需要其他的配置了。demo：

package com.demo.filter;import org.springframework.stereotype.Component;import javax.servlet.*;
import java.io.IOException;
@Component
public class MyFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {System.out.print("filter");chain.doFilter(request,response);}@Overridepublic void destroy() {}
}

2、springboot3以上

版本升级旧包不兼容

import javax.servlet.*;

.切换为spring自带的新包

import jakarta.servlet.*;

package org.example.filter;import jakarta.servlet.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;import java.io.IOException;@Order(1)
@Slf4j
@Component
public class OtherFilter implements Filter {@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {log.info("其他filter开始");log.info("其他filter结束");doFilter(servletRequest, servletResponse, filterChain);}
}