spring-boot整合filter

最新推荐文章于 2024-12-27 09:59:46 发布

转载最新推荐文章于 2024-12-27 09:59:46 发布 · 252 阅读

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#spring-boot Filter

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本文详细介绍如何在Spring Boot中实现Filter接口，并通过两种方式进行Filter的注册：一是通过启动类添加FilterRegistrationBean；二是使用@WebFilter注解。文章提供代码示例，帮助读者理解Filter的配置过程。

1.编写一个Filter类实现Filter接口

package com.jiayun.spring.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 FirstFilter 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 {
		System.out.println("进入SecondFilter");
		chain.doFilter(request, response);
		System.out.println("离开SecondFilter");

	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
	}

}

2.注册自定义的filter与注册servlet一样有两种方式。

2.1在spring-boot启动类中添加方法，返回FilterRegistrationBean,并把该方法注解上@Bean，即可

      
    /**
     * 注册Filter
     */
	@Bean
	public FilterRegistrationBean getFilterRegistrationBean(){
		FilterRegistrationBean bean = new FilterRegistrationBean(new FirstFilter());
		//bean.addUrlPatterns(new String[]{"*.do","*.jsp"});
		bean.addUrlPatterns("/first");
		return bean;
	}

2.2 使用两个注解即可完成Filter的注册

package com.jiayun.spring.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;

//@WebFilter(filterName="FirstFilter", urlPatterns={"*.do","*.jsp"})
@WebFilter(filterName="SecondFilter", urlPatterns="/second")
public class SecondFilter 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 {
		System.out.println("Second Filter start...");
		chain.doFilter(request, response);
		System.out.println("Second Filter out...");
		
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

}

以上是Filter的注册方式的两种配置