loginfilter.java

学习 java 做 的一些 小 试验。。。。。。。可以

package com.wczy.filter;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

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;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import com.wczy.common.db.DBConnect;
import com.wczy.pojo.Users;
public class loginfilter implements Filter {
	private String user;
	
	private String password;

	public void destroy() {
		System.out.println("Filter destroy");

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		Users users=new Users();
		users.username
        if(!this.user.equals(request.getParameter("user"))&&!this.password.equals(request.getParameter("user")))
        {
           System.out.println("请求被拒绝");
           HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper((HttpServletResponse) response);
           HttpServletRequest hreq=(HttpServletRequest)request;
           System.out.println("url:"+hreq.getContextPath());
           wrapper.sendRedirect(hreq.getContextPath()+"/login.html");
           return;
        }else
           System.out.println("很好，请求合法，可以通过!");
        chain.doFilter(request, response);

	}

	public void init(FilterConfig config) throws ServletException {
		 System.out.println("Filter init");
//		 this.user=config.getInitParameter("user");
//		 this.password=config.getInitParameter("pwd");


	}

}