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(转)AJAX请求遭遇未登录和Session失效的解决方案


一般来说我们的项目都有登录过滤器,一般请求足以搞定。但是AJAX却是例外的,所以解决方法是设置响应为session失效。

 

一共分为过滤器和页面JS两个部分的设置,先看过滤器的修改:

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;


/**
* 登录过滤器
*  拥有Session是否失效和用户是否登录2个条件判断
*  如果是ajax请求则设置session超时
* @author Merlin.Ma
*
*/
public class LoginFilter implements Filter{

private String redirectUrl = "/login.html";
private String sessionKey = "userName";

@Override
public void destroy() {
}

@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {

HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse rep = (HttpServletResponse) response;

HttpSession session = req.getSession();

if( session == null || session.getAttribute(sessionKey) == null){
//如果判断是 AJAX 请求,直接设置为session超时
if( req.getHeader("x-requested-with") != null && req.getHeader("x-requested-with").equals("XMLHttpRequest") ) {

rep.setHeader("sessionstatus", "timeout");

} else {
rep.sendRedirect( req.getContextPath() + redirectUrl);
}

}else {
chain.doFilter(request, response);
}
}

@Override
public void init(FilterConfig filterConfig) throws ServletException {

String url = filterConfig.getInitParameter("redirectUrl");
String key = filterConfig.getInitParameter("sessionKey");

redirectUrl = url == null? redirectUrl:url;
sessionKey = key == null ? sessionKey : key ;
}


}

 

//全局的ajax访问,处理ajax清求时sesion超时 
$.ajaxSetup({
contentType : "application/x-www-form-urlencoded;charset=utf-8",
complete : function(XMLHttpRequest, textStatus) {
var sessionstatus = XMLHttpRequest.getResponseHeader("sessionstatus"); // 通过XMLHttpRequest取得响应头,sessionstatus,
if (sessionstatus == "timeout") {
// 如果超时就处理 ,指定要跳转的页面
window.location.replace("login.html");
}
}
});

 页面加载这段js代码,然后开始调用ajax。在不登陆或者session失效的情况下,可以看到页面跳转到登录页面。

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