spring boot filter 配置使用

引言

一.创建一个spring boot 项目

二.Filter的实现类

2.1javax.servlet.Filter;原生接口的实现

package net.xqlee.project.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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 测试用filter
 * 
 * @author xqlee
 *
 */
public class MyFilter implements Filter {

	private static final Logger log = LoggerFactory.getLogger(MyFilter.class);

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		log.info("MyFilter 初始化中...");
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		log.info("进入 MyFilter");
		chain.doFilter(request, response);
	}

	@Override
	public void destroy() {
		log.info("MyFilter 销毁中...");
	}

}

2.2继承spring的OncePerRequestFilter来实现Filter

package net.xqlee.project.filter;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.filter.OncePerRequestFilter;

/**
 * 通过继承spring提供的filter来实现filter
 * 
 * @author xqlee
 *
 */
public class MyOncePerRequestFilter extends OncePerRequestFilter {

	private static final Logger log = LoggerFactory.getLogger(MyOncePerRequestFilter.class);

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {
		log.info("进入 MyOncePerRequestFilter");
		filterChain.doFilter(request, response);
	}

}

三.配置Filter到容器中

package net.xqlee.project.config;

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

import net.xqlee.project.filter.MyFilter;
import net.xqlee.project.filter.MyOncePerRequestFilter;

/**
 * 配置拦截器
 * 
 * @author xqlee
 *
 */
@Configuration
public class FilterConfig {
	/**
	 * 拦截器注册
	 * 
	 * @return
	 */
	@Bean
	public FilterRegistrationBean myFilterRegistration() {
		FilterRegistrationBean registration = new FilterRegistrationBean();
		registration.setFilter(new MyFilter());
		registration.addUrlPatterns("/a/*");// 拦截路径
		registration.setName("MyFilter");// 拦截器名称
		registration.setOrder(1);// 顺序
		return registration;
	}

	/**
	 * 拦截器注册
	 * 
	 * @return
	 */
	@Bean
	public FilterRegistrationBean myOncePerRequestFilterRegistration() {
		FilterRegistrationBean registration = new FilterRegistrationBean();
		registration.setFilter(new MyOncePerRequestFilter());
		registration.addUrlPatterns("/*");// 拦截路径
		registration.setName("MyOncePerRequestFilter");// 拦截器名称
		registration.setOrder(2);// 顺序
		return registration;
	}

}

四.Spring boot Filter测试

package net.xqlee.project.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

	@GetMapping("/a/filter.do")
	public Object hello() {
		return "Hello Filter";
	}

	@GetMapping("/")
	public Object index() {
		return "Welcome Index";
	}

}

spring boot Filter Filter springboot 配置Filter

http://blog.xqlee.com/article/300.html