定时ajax获取日志(easyui进度条+js滚动条)

定时ajax获取日志(easyui滚动条+js)

定时ajax在获取日志信息方便还是很常用的,在这里我使用了easyui的进度条插件,现在整理了一下,完成的功能为:启动定时ajax,清除定时器

js代码

设置全局变量

//为定时器创建一个数组,到时候一起清除
var dingShiQiArr=[];
//提示日志信息
var content ="";
//控制定时ajax的开关
var flag=false;
//定时获取日志信息的ajax属性
var getting = {
		type : "post",
		dataType:"json",
		async : true, //这里要注意,不能为false,否则这个请求会等上一个求完成才执行
		url :contextPathName+'/reportInfo/getLoggerInfos.do',
		beforeSend: function () {
			return flag;
		},
		success:function(data){
			var isStop=data.isStop;//这里为后台的日志信息被读取完后,告诉前台停止定时ajax的标志
			var resultList=data.resultList;
			if(resultList==null||(resultList.length==0)){//日志如果信息为空,不管他,继续请求
					return;
			}else{
				var importProgress= data.progress;//进度条
				$('#importProgressbar').progressbar('setValue',parseInt(importProgress));
				var loggerType=data.loggerType;
				$.each(resultList, function(index, value) { 
					content +="<p>"+value+"</p>";//将日志写入前台
				});
				$('#importResultDiv').html(content);
				document.getElementById('importResultDiv').scrollTop = document.getElementById('importResultDiv').scrollHeight;
				if(isStop==true){
					flag=false;
					$('#importProgressbar').progressbar('setValue',100);
					function test(){ 
    						flag=false;
    						for (var i = dingShiQiArr.length - 1; i >= 0; i--) {
		                			clearInterval(dingShiQiArr[i]);//清除定时器
    			        		};
    					}
    					var t1 = window.setTimeout(test,200); //200毫秒后执行test方法
    					window.clearTimeout(t1);
				}
			}
		},
		error: function() {
			return;
		}
};

启动定时ajax

dingShiQiArr.push(window.setInterval(function(){$.ajax(getting)},200)); 

这个在导入或导出操作之前放上这一行就行,但记得导入导出的ajax请求的async属性也为true!

Controller

这个controller实现的是从session里获取日志信息(进度条信息),每次获取的条数都只是一部分(上次读取位置到最后),这样处理,

 @RequestMapping ("/getLoggerInfos")
    @ResponseBody
    public String getLoggerInfos (HttpServletRequest request, HttpServletResponse response)
    {
        Map <String, Object> jsonMap = new HashMap <String, Object> ();
        List <String> resultList = new ArrayList <String> ();
        List <String> resultListToHtml = new ArrayList <String> ();
        String loggerType = request.getParameter ("loggerType");
        Integer progress = 100;
        boolean flag = false;
        // 读取日志的下标
        int loggerIndex = 0;
        HttpSession session = request.getSession ();
        if (("import").equals (loggerType))
        {
            // 获取导入日志信息
            Object obj = session.getAttribute ("resultList");
            Object loggerIndexObj = session.getAttribute ("loggerIndex");
            Integer isExist = (Integer) loggerIndexObj;
            if (null != isExist)
            {
                loggerIndex = isExist;
            }
            jsonMap.put ("loggerType", loggerType);
            if (null != obj)
            {
                resultList = (List <String>) obj;
                for (; loggerIndex < resultList.size (); loggerIndex++)
                {
                    String str = resultList.get (loggerIndex);
                    if ("OVER".equals (str))
                    {
                        flag = true;
                        session.removeAttribute ("resultList");
                    }
                    else
                    {
                        resultListToHtml.add (str);
                    }
                }
                session.setAttribute ("loggerIndex", Integer.valueOf (loggerIndex));
            }
            else
            {
                resultList = null;
            }
            // 获取导入进度
            Object obj1 = session.getAttribute ("importProgress");
            if (null != obj1)
            {
                progress = (Integer) obj1;
            }
        }
        else if (("export").equals (loggerType))
        {
            // 获取导出日志信息
            Object obj = session.getAttribute ("exportResultList");
            Object loggerIndexObj = session.getAttribute ("exp_loggerIndex");
            Integer isExist = (Integer) loggerIndexObj;
            if (null != isExist)
            {
                loggerIndex = isExist;
            }
            jsonMap.put ("loggerType", loggerType);
            if (null != obj)
            {
                resultList = (List <String>) obj;
                for (; loggerIndex < resultList.size (); loggerIndex++)
                {
                    String str = resultList.get (loggerIndex);
                    if ("OVER".equals (str))
                    {
                        flag = true;
                        session.removeAttribute ("exportResultList");
                    }
                    else
                    {
                        resultListToHtml.add (str);
                    }
                }
                session.setAttribute ("exp_loggerIndex", Integer.valueOf (loggerIndex));
            }
            else
            {
                resultList = null;
            }
            // 获取导入进度
            Object obj1 = session.getAttribute ("exportProgress");
            if (null != obj1)
            {
                progress = (Integer) obj1;
            }
        }
        jsonMap.put ("isStop", flag);
        jsonMap.put ("resultList", resultListToHtml);
        jsonMap.put ("progress", progress);
        String jsonStr = JSONObject.fromObject (jsonMap).toString ();
        return jsonStr;
    }

html

<!-- 显示日志弹出框 importResultDiv-->
	<div id="showResult" class="easyui-dialog"
		style="width: 600px; height:550px;" closed="true"
		buttons="#showResult-buttons" data-options="modal:true">
			<div id="importProgressbar" class="easyui-progressbar" style="width:540px;margin-left:20px;margin-top:20px;"></div>
			<div id="importResultDiv" class="importResultDiv">
	
			</div>
	</div>
	
	<div id="showResult-buttons">
		<a href="javascript:void(0)" class="easyui-linkbutton"
			iconCls="icon-cancel" id="claenResult">关闭</a>
	</div>

补充(日志显示框滚动条在底部)

document.getElementById('importResultDiv').scrollTop = document.getElementById('importResultDiv').scrollHeight;

该代码表示,日志框出现滚动条时,会滚动到最底部,将呈现出一种动态的效果给用户!

效果