servlet3.0 新特性和springboot Listener和filter案例

1.filter

package com.newtouch.zxf.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;

import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Order(1)
@WebFilter(filterName="LoginFilter",urlPatterns="/*")
@Component
public class LoginFilter implements Filter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		System.out.println("init");

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {

		System.out.println("TestFilter1");
		chain.doFilter(request,response);
	}

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

	}

}

　　

1、@Component 这个注解的目的是将LoginFilter交给容器来处理。也就是让LoginFilter起作用

2、@order确定多个filter的执行顺序 数字越小越先执行

package com.newtouch.zxf.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

import org.springframework.stereotype.Component;

@WebListener
@Component
public class MyListerner implements ServletContextListener {

	@Override
	public void contextInitialized(ServletContextEvent sce) {
		System.out.print("--------------contextDestroyed");

	}

	@Override
	public void contextDestroyed(ServletContextEvent sce) {
		System.out.print("--------------contextDestroyed");

	}

}

　　

1.@WebListener 标记这个类是一个监听器
2.@Component 这个注解的目的是将LoginFilter交给容器来处理。也就是让LoginFilter起作用