package com.whyc.filter;
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import com.whyc.pojo.User;
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import com.whyc.util.ShiroUtil;
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import javax.servlet.*;
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import javax.servlet.annotation.WebFilter;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpSession;
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import java.io.IOException;
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/**
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* 账号同时登录只能1个
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*/
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@WebFilter(urlPatterns = "/*",filterName = "kickedOutFilter")
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public class KickedOutFilter implements Filter {
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@Override
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
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HttpSession session = ((HttpServletRequest) request).getSession();
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//如果是登录,则不进行Session对比,放行
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if(!((HttpServletRequest) request).getRequestURI().contains("login")) {
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User user = ShiroUtil.getUser();
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if (user.getId() != 0) {
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System.out.println("Filter过滤器中获取到的当前Session的SessionId为:" + session.getId());
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if (!request.getServletContext().getAttribute(user.getName()).equals(session.getId())) {
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//如果当前Session所对应的SessionId与全局中用户对应的SessionId不一致,则清除当前Session
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session.invalidate();
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().write("<script language='javascript' type='text/javascript'>alert('账号已经在其他地方登录,请重新登录');self.location='login.html'</script> ");
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return;
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}
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}
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}
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chain.doFilter(request,response);
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}
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}
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