java 拦截登陆页面跳转页面跳转页面跳转页面,怎么使用filter实现未登录用户自动跳转到登录页面(答案)...

Java codepackage group3.tsims.tools;

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.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class AdminAuthorityFilter implements Filter {

/*

* (non-Javadoc)

* @see javax.servlet.Filter#destroy()

*/

public void destroy() {

}

/*

* (non-Javadoc)

* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)

*/

public void doFilter(ServletRequest request, Se