session過期(springMVC)

1.配置web.xml檔案

<filter>
    <filter-name>timoutFilter</filter-name>
    <filter-class>com.chinalbs.base.filter.SessionTimeoutFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>timoutFilter</filter-name>
    <url-pattern>*.do</url-pattern>
  </filter-mapping>
  <session-config>
  	<session-timeout>1</session-timeout>
  </session-config>
           

2.建立過濾器    SessionTimeoutFilter

package com.chinalbs.base.filter;

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;

public class SessionTimeoutFilter implements Filter{

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest httpRequest = (HttpServletRequest) arg0;
		HttpServletResponse httpResponse = (HttpServletResponse) arg1;
		String loginUrl = httpRequest.getContextPath() + "/login.jsp";
		
		String url = httpRequest.getRequestURI();
		if (!url.contains("validate") && httpRequest.getSession(false) == null) {
			String str = "<script language='javascript'>alert('會話過期,請重新登入');"
					+ "window.top.location.href='"
					+ loginUrl
					+ "';</script>";
			httpResponse.setContentType("text/html;charset=UTF-8");// 解決中文亂碼
			PrintWriter writer = httpResponse.getWriter();
			writer.write(str);
			writer.flush();
			return;
		}
		chain.doFilter(httpRequest, httpResponse);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
	}

}
           

3.對于一般請求以上兩個步驟即可。但是對于ajax強求則需進一步處理，如：

$.ajax({
				cache: false,
				type: "POST",
				url:'${pageContext.request.contextPath}/user/updatePassword.do',
				data:{id:id,password:password},
				async : false,
				error : function(request) {
					alert("通路背景失敗!");
				},
				success:function(data){
					if(data == true || data == "true"){
						window.location.href = "${pageContext.request.contextPath}/user/queryListByParam.do";
					}else if(data == false || data == "false"){
						alert("重置密碼失敗！");
					}else{
                        document.write(data);//當session過期時，data即為filter中傳回的請求
					}
				}
			});