Servlet过滤器入门：实现与配置

package com.henau.example;

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 FilterDemo1 implements Filter {

	@Override
	public void destroy() {
		System.out.println("过滤器1已销毁");
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		System.out.println("调用过滤器1前");
		chain.doFilter(request, response);
		System.out.println("调用过滤器1后");
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
		System.out.println("过滤器1已初始化");
	}

}

	FilterDemo1
	com.henau.example.FilterDemo1


	FilterDemo1
	/*

调用过滤器1前
调用过滤器2前
输出
调用过滤器2后
调用过滤器1后