servlet 过滤器使用

dy_love_wade 2012-12-27 10:48:18

index.jsp
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>title</title>
</head>
<body>
<a href="\My?a=1&b=2">点击这里</a>

</body>
</html>

My servlet
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter out=response.getWriter();
out.println("输出");
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request,response);
}

过滤器

package com.dy;

import java.io.IOException;
import java.util.Date;

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 javax.servlet.http.HttpServletRequest;

/**
* Servlet Filter implementation class Mx
*/
@WebFilter(servletNames = {"My"},urlPatterns="/b.jsp")
public class Mx implements Filter {

/**
* Default constructor.
*/
@SuppressWarnings("unused")
private FilterConfig filterconfig;
public Mx() {
// TODO Auto-generated constructor stub
}

/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
this.filterconfig=null;
}

/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
/*
HttpServletRequest req = (HttpServletRequest)request;
System.out.println(req.getRemoteHost() +" tried to access " +req.getRequestURL() +" on " + new Date() + ".");
*/
System.out.println("输出参数");
// pass the request along the filter chain
chain.doFilter(request, response);
}

/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
this.filterconfig=fConfig;
}

}
但是运行部出来，指点下呢？？

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