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springboot 使用 servlet 过滤器     所属分类 springboot 浏览量 69
import java.io.IOException;
import java.time.LocalDateTime;

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;

public class TimeLogFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("TimeLogFilter init,"+LocalDateTime.now());
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        long start = System.currentTimeMillis();
        filterChain.doFilter(servletRequest,servletResponse);
        long end = System.currentTimeMillis();
        long time = end - start;
        String url = ((HttpServletRequest)servletRequest).getServletPath();
        System.out.println("TimeLogFilter."+time+","+url);
    }
 
    @Override
    public void destroy() {
 
    }
}


两种注册方式
FilterRegistrationBean
ServletComponentScan 注解

TimeLogFilter  使用 FilterRegistrationBean 注册

	@Bean
	public FilterRegistrationBean registFilter() {
		FilterRegistrationBean registration = new FilterRegistrationBean();
		registration.setFilter(new TimeLogFilter());
		registration.addUrlPatterns("/*");
		registration.setName("TimeLogFilter");
		registration.setOrder(1);
		return registration;
	}
	
	
TimeLogFilter2 使用 ServletComponentScan 注解注册
@WebFilter(urlPatterns = "/*", filterName = "logFilter2")
public class TimeLogFilter2 implements Filter {


TimeLogFilter2 没有设置顺序
@WebFilter 注解并没有指定执行顺序的属性


Filter 顺序 建议 使用 FilterRegistrationBean order 来控制
order小的先执行


例子代码
https://gitee.com/dyyx/springboothello/tree/master/src/main/java/demo/filter

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