关于PHP处理Json数据的例子

最近工作需要在原来静态看板(大屏)页面的基础上,实现数据的动态展示,而且需要定时刷新。
接到任务后就马不停蹄的开始修改页面:
显然这个需求最好的解决方法就是用Ajax对后台数据进行定时请求,在前端页面进行刷新

基本的效果是这个样子的:

对后台数据进行遍历,循环展示在表格上。

老实讲,做个Ajax向后端请求数据确实easy,但是刺激的是没有数据接口给我拿来测试,作为实习生的我又不可能招呼其他人来帮我测试。
所以还是得靠自己。
接下来我只能凭借我做博客系统积攒的一些PHP经验开发接口,完成测试。

代码如下:

<?php
	//连基础元数据都是我自己拍脑袋模拟出来的,有点崇拜我寄几了呢!
	$json = '{
		"data": [
			{
				"TOP_LINE": 10000,
				"BOTTOM_LINE": 500,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 20000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":3000,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "外轮星"
			},
			{
				"TOP_LINE": 30000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 40000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":3000,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "外星轮"
			},
			{
				"TOP_LINE": 50000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 60000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 20000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 20000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 20000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 20000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":5121,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "实轴"
			},
			{
				"TOP_LINE": 20000,
				"BOTTOM_LINE": 5000,
				"NOW_NUMBER":3000,
				"THIS_MOUTH_TAKEIN":0,
				"THIS_MOUTH_TAKEOUT":0,
				"LAST_MOUTH_TAKEIN":0,
				"LAST_MOUTH_TAKEOUT":0,
				"RAW_MATERIAL_BATCH_NUMBER_": "SDS-7120",
				"OWN_ADRESS": "GEM",
				"MATERIAL_NAME_": "外星轮"
			}
		],
		"success": true,
		"total": 2
	}';
	//Ajax传过来的参数,page是页码,listnum是每页展示的数据条数
	$page = $_GET['page'];
	$listNum = $_GET['listNum'];
	//这个函数蛮重要的json_decode();因为实际上$json我们定义的是个String ,这个函数将它转化成json格式的数据
	$jsondata=json_decode($json);
	//定义头文件,防止乱码
	header("Content-Type: text/html; charset=UTF-8");
	
	//这样我们就可以拿到我们要的数组了
	$arr = $jsondata->data; 

	//下面是为了拆分后台数据所做的努力了:$sign是判断总数据可以分成多少页
	$sign = intval(count($arr)/$listNum)+1;
	//如果传过来的页码大于总页码,不好意思,只能取模了,这样才能一直循环下去
	if ($page >= $sign) {
		$page = $page % $sign;
	}
	//array_slice(array,start,length),php截取数组的方法
	$toget = array_slice($arr,$page*$listNum,$listNum);
	//返回数据
	echo json_encode($toget); 
	
?>

顺便说一下我们老大给我派发任务的时候的一个知识点:

  • 我原来的思路是用一次Ajax请求将后台数据全部拿到,然后在前端分页循环展示(这可能是作为前端开发者常有的思维,),这个思路看似没有问题。
  • 因为我们的系统是要部署到工业生产现场的,网络延迟和实时数据 是两个不得不考虑的问题,那么这个时候就必须减少每次请求的负载,还要考虑数据的实效性。
  • 这样一来显然通过小批量多频次请求数据更靠谱。
  • 所以有了现在的解决方案。

为了方便读者理解整个思路,附上Ajax请求部分代码:

window.onload=function(){
	var page = 0 ;
	var listNum = 6;
	console.log('000');
	getAjax(page,listNum);
	setInterval(function(){
		page++;
		
		console.log(page);
		
		getAjax(page,listNum);
		
	},3000);

	function getAjax(page,listNum){
		var args = {"page":page,"listNum":listNum,"time":new Date()};
		$.getJSON('../json/storage_rawInventeryView.php',args,function(result){
			
			var arr = result;
			console.log(arr);//调试数据
				//改变颜色专用变量
				var markup = true;
				var color;
				//调整数据的顺序
				
			//循环遍历json,将获取到的数据插入到页面上
			$('tbody').empty();	
			for (var i = 0; i < arr.length ; i++) {
				$('tbody').append('<tr></tr>');
				markup = !markup;
				if(markup){
					color = '#58D5FF';
				}else{
					color = '#fff';
				}
				//调整数据的顺序
				var turnList = ["RAW_MATERIAL_BATCH_NUMBER_","MATERIAL_NAME_","TOP_LINE","BOTTOM_LINE","NOW_NUMBER","LAST_MOUTH_TAKEOUT","THIS_MOUTH_TAKEIN","THIS_MOUTH_TAKEOUT","LAST_MOUTH_TAKEIN","OWN_ADRESS"];
				
				for(var q = 0;q < turnList.length; q++){
					//console.log(turnList[q]);
					if(arr[i][turnList[q]]=='是'){
						var tdHtml = '<td style="word-wrap: break-word;text-align:center;font-size:2.5vw;color:#1DFC8A;" class="ng-binding ng-scope">合格</td>';
					}else if(arr[i][turnList[q]]=='否'){
						var tdHtml = '<td style="word-wrap: break-word;text-align:center;font-size:2.5vw;color:#F3423C;" class="ng-binding ng-scope">退货</td>';
					}else{
						var tdHtml = '<td style="word-wrap: break-word;text-align:center;font-size:2.5vw;color:'+color+';" class="ng-binding ng-scope">'+arr[i][turnList[q]]+'</td>';
					}
				
					$('tbody>tr:eq('+i+')').append( tdHtml);
				} 
			}
		});
	}

	
}
posted @ 2018-05-13 15:23  阿明先森  阅读(76)  评论(0编辑  收藏  举报