項目需要做一個自動登出的功能，查詢了網上的資料，一開始准備用session監聽做，按照下面方式配置監聽器
1.在項目的web.xml文件中添加如下代碼：
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<!--添加Session監聽器-->
<
listener
>
<
listener-class
> 監聽器路徑 </
listener-class
>
</
listener
>
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2.編寫java類。
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public
class
SessionListener
implements
HttpSessionListener {
public
void
sessionCreated(HttpSessionEvent arg0) {
// session創建時執行
SimpleDateFormat simpleFormat =
new
SimpleDateFormat(
"mm-ss-ms"
);
String nowtimes = simpleFormat.format(
new
Date());
User u=
null
;
//System.out.println("執行。。 當前時間："+nowtimes+"_"+u);
HttpSession ses= arg0.getSession();
String id=ses.getId()+
"_"
+ses.getCreationTime();
}
public
void
sessionDestroyed(HttpSessionEvent arg0) {
// session失效時執行
SimpleDateFormat simpleFormat =
new
SimpleDateFormat(
"mm-ss-ms"
);
String nowtimes = simpleFormat.format(
new
Date());
//System.out.println("session失效了。。 結束時間： "+nowtimes);
}
}
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配置完成后等session失效后成功進入sessionDestroyed方法，准備進行頁面跳轉操作，發現不能寫跳轉，這個監聽是做一些后台統計處理的，無法實現頁面跳轉的功能。
只能放棄這方法了，開始使用過濾器實現
1、web.xml中添加過濾器配置
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<
filter
>
<
filter-name
>sessionFilter</
filter-name
>
<
filter-class
>com.orchestrall.web.helper.session.SessionFilter</
filter-class
>
</
filter
>
<
filter-mapping
>
<
filter-name
>sessionFilter</
filter-name
>
<
url-pattern
>/actions/*</
url-pattern
>
</
filter-mapping
>
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2、新建SessionFilter類，實現Filter接口。
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public
class
SessionFilter implements Filter {
public
void
destroy() {
// TODO Auto-generated method stub
}
public
void
doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws
IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
HttpServletResponse httpResponse = (HttpServletResponse) response;
HttpSession session = httpRequest.getSession();
// 登陸url
String loginUrl = httpRequest.getContextPath() +
"/admin/login.jsp"
;
String url = httpRequest.getRequestURI();
String path = url.substring(url.lastIndexOf(
"/"
));
// 超時處理，ajax請求超時設置超時狀態，頁面請求超時則返回提示並重定向
if
(path.indexOf(
".action"
) != -
1
&& session.getAttribute(
"LOGIN_SUCCESS"
) ==
null
) {
// 判斷是否為ajax請求
if
(httpRequest.getHeader(
"x-requested-with"
) !=
null
&& httpRequest.getHeader(
"x-requested-with"
)
.equalsIgnoreCase(
"XMLHttpRequest"
)) {
httpResponse.addHeader(
"sessionstatus"
,
"timeOut"
);
httpResponse.addHeader(
"loginPath"
, loginUrl);
chain.doFilter(request, response);
// 不可少，否則請求會出錯
}
else
{
String str =
"<script language='javascript'>alert('會話過期,請重新登錄');"
+
"window.top.location.href='"
+ loginUrl
+
"';</script>"
;
response.setContentType(
"text/html;charset=UTF-8"
);
// 解決中文亂碼
try
{
PrintWriter writer = response.getWriter();
writer.write(str);
writer.flush();
writer.close();
}
catch
(Exception e) {
e.printStackTrace();
}
}
}
else
{
chain.doFilter(request, response);
}
}
@Override
public
void
init(FilterConfig arg0)
throws
ServletException {
// TODO Auto-generated method stub
}
}
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3、客戶端JS，用於ajax請求session超時
對於jquery
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<script type=
"text/javascript"
>
$(document).ajaxComplete(
function
(event, xhr, settings) {
if
(xhr.getResponseHeader(
"sessionstatus"
)==
"timeOut"
){
if
(xhr.getResponseHeader(
"loginPath"
)){
alert(
"會話過期，請重新登陸!"
);
window.location.replace(xhr.getResponseHeader(
"loginPath"
));
}
else
{
alert(
"請求超時請重新登陸 !"
);
}
}
});
</script>
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對於extjs的ajax請求
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Ext.Ajax.on(
'requestcomplete'
,checkUserSessionStatus,
this
);
function
checkUserSessionStatus(conn,response,options){
if
(response.getResponseHeader(
"sessionstatus"
) ==
'timeout'
){
if
(response.getResponseHeader(
"loginPath"
)){
alert(
"會話過期，請重新登陸!"
);
window.top.location.href = response.getResponseHeader(
"loginPath"
);
}
else
{
alert(
"請求超時請重新登陸 !"
);
}
}
}
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如果使某個ajax請求不受全局方法的影響，那么可以在使用$.ajax()方法時，將參數中的global設置為false，jquery代碼如下：
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$.ajax({
url:
"test.html"
,
global:
false
//不觸發全局ajax事件
})
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