javaweb过滤器与器_java过滤器配置_java器怎么写(3)

}

publicvoid doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

}

Filter：

package cn.itcast.filter;

import java.io.IOException;

import java.util.Enumeration;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

/**

* @authorwjn

* 1：定义一个类，实现javax.servlet.Filter;

* 2：要进行拦截或者增强的代码，要写在doFilter方法中

* 3：在web.xml中做配置

*/

publicclassMyFilterimplements Filter{

@Override//初始化的方法

publicvoid init(FilterConfig config) throws ServletException {

System.out.println("MyFilter....init....");

//获取过滤器名称

//选中要输出的内容，按住alt，点击两次右斜线

System.out.println("FilterName:"+config.getFilterName());

//获取指定的初始化参数

String plane = config.getInitParameter("plane");

System.out.println("plane:"+plane);

String train = config.getInitParameter("train");

System.out.println("train:"+train);

//获取所有初始化参数的名称

Enumeration<String> enumeration = config.getInitParameterNames();

while(enumeration.hasMoreElements()){

System.out.println(enumeration.nextElement());

}

}

@Override//执行过滤任务的方法

publicvoid doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

System.out.println("MyFilter.....doFilter.....");

//chain:是放行请求和响应的对象

chain.doFilter(request, response);

}

@Override//销毁的方法

publicvoid destroy() {

System.out.println("MyFilter....destroy....");

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