一、問(wèn)題描述：

當(dāng)訪問(wèn)一個(gè)需要登錄的頁(yè)面時(shí)，會(huì)有過(guò)濾器或者攔截器進(jìn)行過(guò)濾攔截，如果用戶沒(méi)有登錄，則跳轉(zhuǎn)到登錄頁(yè)面。

當(dāng)用戶已經(jīng)登錄進(jìn)入系統(tǒng)后，然后長(zhǎng)時(shí)間沒(méi)操作，等到session過(guò)期后，再點(diǎn)擊一個(gè)ajax請(qǐng)求操作時(shí)，這時(shí)再跳轉(zhuǎn)到登錄頁(yè)面就不合適了，因?yàn)檫@是ajax操作，攔截后跳到頁(yè)面返回的結(jié)果js識(shí)別不了。

二、解決方法：

在過(guò)濾器或者攔截器上做識(shí)別，針對(duì)頁(yè)面跳轉(zhuǎn)請(qǐng)求和ajax請(qǐng)求分別處理。

頁(yè)面跳轉(zhuǎn)的不再詳說(shuō)，現(xiàn)在說(shuō)的是ajax請(qǐng)求。

直接貼代碼：

import java.io.IOException; import java.io.PrintWriter; 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 org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; @Component('authenticationFilter') public class AuthenticationFilter implements Filter { @Autowired SessionContext sessionContext; private Logger log = LoggerFactory.getLogger(AuthenticationFilter.class); @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest)request; HttpServletResponse res = (HttpServletResponse) response; //判斷是否為ajax請(qǐng)求，默認(rèn)不是 boolean isAjaxRequest = false; if(!StrUtils.isBlank(req.getHeader('x-requested-with')) && req.getHeader('x-requested-with').equals('XMLHttpRequest')){ isAjaxRequest = true; } SysUser sysUser = sessionContext.getSysUserFromSession(req); if (sysUser != null && sysUser.getUserId() != null) { chain.doFilter(req, res); }else{//Session用戶為空，登錄過(guò)期 if(isAjaxRequest){// 如果是ajax請(qǐng)求，則不是跳轉(zhuǎn)頁(yè)面，使用response返回結(jié)果 res.setHeader('noAuthentication', 'true'); ResultWithObject resultWithObject = new ResultWithObject(CC.NEGATIVE_1, CC.RESULT_MESSAGE_TEXT_DEFAULT); resultWithObject.setMsg('登錄已失效，請(qǐng)刷新頁(yè)面或重新登錄！'); res.setContentType('application/json;charset=UTF-8'); PrintWriter writer = res.getWriter(); writer.write(JasonUtils.Object2String(resultWithObject)); writer.close(); res.flushBuffer(); }else{ res.sendRedirect('http://xxxx.com/loginUI'); } } } @Override public void destroy() { } }

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