springboot2.0 快速使用自定义Filter过滤器

springboot 中没有web.xml 我们无法按照原来定义filter 方式使用我们的自定义filter，我们需要自定义@Configuration 直接的类，并将我们自定义的filter 加入到springboot 的过滤链中。

demo版本说明：

jdk版本：1.8.0_144

springboot版本：2.0.5.RELEASE

1 自定义filter

在这里我们定义一个拦截访问url的filter

package cn.lijunkui.filters;

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.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class UrlFilter implements Filter {
	private Logger log =  LoggerFactory.getLogger(UrlFilter.class);

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest httpServletRequest = (HttpServletRequest) request;
		String requestURI = httpServletRequest.getRequestURI();
		StringBuffer requestURL = httpServletRequest.getRequestURL();
		log.info("requestURI:" +requestURI+" "+"requestURL:"+requestURL);
		chain.doFilter(httpServletRequest, response);
	}

	@Override
	public void destroy() {
		
	}

}

2 定义@Configuration 注解的类并将自定义的filter 加入到过滤链中

package cn.lijunkui.config;

import java.util.ArrayList;
import java.util.List;

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

import cn.lijunkui.filters.UrlFilter;

@Configuration
public class FilterConfig {
	@Bean
	public FilterRegistrationBean filterRegistration() {
		FilterRegistrationBean registration = new FilterRegistrationBean();
		registration.setFilter(new UrlFilter());
		List<String> urlList = new ArrayList<String>();
	    urlList.add("/*");
	    registration.setUrlPatterns(urlList);
		registration.setName("UrlFilter");
		registration.setOrder(1);
		return registration;
	}
}

3 进行测试

启动spirngboot 项目通过游览器访问我们的服务

demo总结：springboot中自定义filter 我们需要编写Filter累实现Filter接口同时定义 Filter的配置类。配置类需要声明@Configuration注解同时定义声明@Bean的方法。然后将自定义filter添加到FilterRegistrationBean 中即可。

springboot2.0 快速使用自定义Filter过滤器

demo版本说明：

1 自定义filter

猜你喜欢