jsp中内嵌的java代码数据获取

文艺骚年丶 2015-12-15 10:57:08

我在jsp页面，内嵌的java代码交互的后台，但是获取的数据不是实时的，请问有什么方法可以获取实时数据

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Andy_Zach 2015-12-17

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首先，你的java代码放在jsp里面不好实时调用，我建议放在java类中用ajax调用！
myInterval这个方法里面实现ajax调用，然后拿到值实现你的if判断！在进入页面时要加载此方法
setInterval("myInterval()",4000);这个方法要写到myInterval方法之中，才能保证实现每个4秒刷一次

文艺骚年丶 2015-12-16

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引用 9 楼 xiaofanku 的回复:

看不懂我写的吗？不贴全算了。

大哥我错了我贴全 <%@ page import="connector.MagicalarmConnector; auth.Role;java.util.List;java.util.ArrayList;" %> <% String address = request.remoteAddr def ip = address; def name=session.username def rsdatasourc = "magicalarmtacfmdev"; def connector = MagicalarmConnector.get(name: rsdatasourc) if (connector == null) { throw new Exception("Could not find Magicalarm connector magicalarm.") } def datasource = connector.ds; def zt="select distinct dlzt from t_sys_loginuser where username =? and ip=?"; def query = "select sparm.parm_value from T_SYS_PARM sparm where sparm.parm_code='iam_kps_url'"; def kpsUrl=""; def iamZt=""; List<String> roleList = new ArrayList(); try { def sparmList = datasource.alertsAdapter.executeQuery(query, []); def ztList = datasource.alertsAdapter.executeQuery(zt, [name,ip]); ztList?.each {tree -> iamZt=tree.dlzt; } sparmList?.each {sparm -> kpsUrl=sparm.parm_value } //菜单名以iam开头的 String roleSql = """select distinct ro.role_name, case when Substr(lower(me.menu_name), 0, 3) = 'iam' THEN me.menu_name ELSE NULL END as menu_name from t_sys_Menu me, t_sys_Role_Pmit_Menu mu, t_sys_role ro, t_sys_user_resp_role re, t_sys_user us where mu.menu_id = me.menu_id(+) and mu.role_id(+) = ro.role_id and us.user_id = re.user_id and ro.role_id = re.role_id and us.user_login_name = '${session.username}'""" def rolesArray = datasource.alertsAdapter.executeQuery(roleSql, []); rolesArray?.each { if(it.role_name&&!roleList.contains(it.role_name.toString())){ roleList.add(it.role_name.toString()); } if(it.menu_name&&!roleList.contains(it.menu_name.toString())){ roleList.add(it.menu_name.toString()); } } } catch (Exception ex) { println "抱歉，数据库连接异常:" + ex.getMessage(); } %> <html> <head> <title><g:layoutTitle default="${message(code:'mainLayout.title')}"></g:layoutTitle></title> <g:layoutHead/> <g:render template="/layouts/layoutHeader"></g:render> <link rel="stylesheet" type="text/css" href="${createLinkTo(file: 'css/tab_menu.css')}"/> <script type="text/javascript " src="../js/autologin.js"></script> </head> <body class="yui-skin-sam"> <script type="text/javascript"> window.loadingMask = new YAHOO.rapidjs.component.LoadingMask({}); window.loadingMask.show(); var zt= "${iamZt}"; setInterval("myInterval()",4000);//1000为1秒钟 function myInterval() { if(zt==""){ alert("您已被迫下线，需重新登录"); window.location.href = "/iam/auth/login?message=被迫下线，需重新登录"; //document.body.innerHTML = response.responseText; return; } } </script> <g:render template="/layouts/commonLayout"></g:render> <rui:html id="changeProfileDialog" iframe="false"></rui:html> <rui:popupWindow componentId="changeProfileDialog" width="390" height="250" resizable="false" title="${g.message(code:'mainLayout.changeprofile')}"></rui:popupWindow> < <g:layoutBody/> </body> </html> 没用的我都删除了

文艺骚年丶 2015-12-15

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引用 3 楼 u012239465 的回复:

只有页面加载的时候才执行吧

对呀只有刷新才能获取实时数据但是我不想刷新页面获取实时数据用ajax 好像也实现不了

文艺骚年丶 2015-12-15

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引用 1 楼 xiaofanku 的回复:

贴一下你的jsp

jstl 我获取的数据也不是实时的你这种方法我没用过。。怎么用求指教

文艺骚年丶 2015-12-15

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<%@ page import="connector.MagicalarmConnector; auth.Role;java.util.List;java.util.ArrayList;" %> <% String address = request.remoteAddr def ip = address; def name=session.username def rsdatasourc = "magicalarmtacfmdev"; def connector = MagicalarmConnector.get(name: rsdatasourc) if (connector == null) { throw new Exception("Could not find Magicalarm connector magicalarm.") } def datasource = connector.ds; def zt="select distinct dlzt from t_sys_loginuser where username =? and ip=?"; def query = "select sparm.parm_value from T_SYS_PARM sparm where sparm.parm_code='iam_kps_url'"; def kpsUrl=""; def iamZt=""; List<String> roleList = new ArrayList(); try { def sparmList = datasource.alertsAdapter.executeQuery(query, []); def ztList = datasource.alertsAdapter.executeQuery(zt, [name,ip]); ztList?.each {tree -> iamZt=tree.dlzt; } sparmList?.each {sparm -> kpsUrl=sparm.parm_value } //菜单名以iam开头的 String roleSql = """select distinct ro.role_name, case when Substr(lower(me.menu_name), 0, 3) = 'iam' THEN me.menu_name ELSE NULL END as menu_name from t_sys_Menu me, t_sys_Role_Pmit_Menu mu, t_sys_role ro, t_sys_user_resp_role re, t_sys_user us where mu.menu_id = me.menu_id(+) and mu.role_id(+) = ro.role_id and us.user_id = re.user_id and ro.role_id = re.role_id and us.user_login_name = '${session.username}'""" def rolesArray = datasource.alertsAdapter.executeQuery(roleSql, []); rolesArray?.each { if(it.role_name&&!roleList.contains(it.role_name.toString())){ roleList.add(it.role_name.toString()); } if(it.menu_name&&!roleList.contains(it.menu_name.toString())){ roleList.add(it.menu_name.toString()); } } } catch (Exception ex) { println "抱歉，数据库连接异常:" + ex.getMessage(); } %> 上面就是我页面后台交互的代码下面就是我获取的数据但是这个只能获取初始值无法获取实时的数据 <script type="text/javascript"> var zt= "${iamZt}"; setInterval("myInterval()",4000);//1000为1秒钟 function myInterval() { if(zt==""){ alert("数据为："+zt); } } </script>