java后台操作redis中存放的json数据，对其属性值进行更改

本文链接：https://blog.youkuaiyun.com/qq_40798764/article/details/96430784

本文介绍如何在Java后台操作Redis存储的JSON数据，具体场景是将JSON对象中增加一个时间字段。通过Java代码示例展示了实现这一功能的方法。

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redis中的json格式：

{
  "map": [
    {
      "sensorNumber": "000256a",
      "L1": "10",
      "L2": "9",
      "L3": "0",
      "L4": "0",
      "FXD": "0.122"
    },
    {
      "sensorNumber": "00045",
      "L1": "10",
      "L2": "9",
      "L3": "0",
      "L4": "0",
      "FXD": "0.122"
    },
    {
      "sensorNumber": "000252",
      "L1": 10,
      "L2": "9",
      "L3": "0",
      "L4": "0",
      "FXD": "0.122"
    },
    {
      "sensorNumber": "00013",
      "L1":   10,
      "L2": "9",
      "L3": "0",
      "L4": "0",
      "FXD": "0.122"
    },
    {
      "sensorNumber": "00024",
      "L1":   10,
      "L2": "9",
      "L3": "0",
      "L4": "0",
      "FXD": "0.122"
    },
    {
      "sensorNumber": "000245",
      "L1":   10,
      "L2": "9",
      "L3": "0",
      "L4": "0",
      "FXD": "0.122"
    }
  ]
}

redis客户端：

在这里插入图片描述

需求：要在json对象属性中加入一个时间字段，就成了如下的格式：

{
	"data": [{
		"l1": "10",
		"l2": "9",
		"l3": "0",
		"l4": "0",
		"sensor_number": "000256a",
		"time": 1563426727496
	}, {
		"l1": "10",
		"l2": "9",
		"l3": "0",
		"l4": "0",
		"sensor_number": "00045",
		"time": 1563426727497
	}, {
		"l1": "10",
		"l2": "9",
		"l3": "0",
		"l4": "0",
		"sensor_number": "000252",
		"time": 1563426727497
	}, {
		"l1": "10",
		"l2": "9",
		"l3": "0",
		"l4": "0",
		"sensor_number": "00013",
		"time": 1563426727497
	}, {
		"l1": "10",
		"l2": "9",
		"l3": "0",
		"l4": "0",
		"sensor_number": "00024",
		"time": 1563426727497
	}, {
		"l1": "10",
		"l2": "9",
		"l3": "0",
		"l4": "0",
		"sensor_number": "000245",
		"time": 1563426727497
	}]
}

java处理代码：

@RequestMapping(value = "ContinuedTime", method = RequestMethod.GET, produces = "text/html;charset=UTF-8")
	@ResponseBody
	public String ContinuedTime(){
		JSONObject jo = new JSONObject();
		//获取到redis中的json数据
		String string = redisService.get("BUILDDATA_REDIS_KEY_PREFFIX");
		JSONObject obj = JSONObject.parseObject(string);
		String data=obj.toJSONString();
    	//解析json数据
    	JSONObject json = JSON.parseObject(data);
    	String createArr=json.getString("map");
    	List<DengJi> list = new ArrayList<DengJi>();
    	
    	if(StringUtils.isNotEmpty(createArr)){
    		JSONArray createArray=JSONArray.parseArray(createArr);
    		for(int i=0;i<createArray.size();i++){
    			String sensorNumber=JSONObject.parseObject(JSONObject.toJSONString(createArray.get(i))).getString("sensorNumber");
                String L1=JSONObject.parseObject(JSONObject.toJSONString(createArray.get(i))).getString("L1");
                String L2=JSONObject.parseObject(JSONObject.toJSONString(createArray.get(i))).getString("L2");
                String L3=JSONObject.parseObject(JSONObject.toJSONString(createArray.get(i))).getString("L3");
                String L4=JSONObject.parseObject(JSONObject.toJSONString(createArray.get(i))).getString("L4");
                //创建热门搜索对象
    	    	DengJi DengJi=new DengJi();
    	    	DengJi.setSensor_number(sensorNumber);
    	    	DengJi.setL1(L1);
    	    	DengJi.setL2(L2);
    	    	DengJi.setL3(L3);
    	    	DengJi.setL4(L4);
    	    	DengJi.setTime(new Date());
    	    	list.add(DengJi);
            }
    	}
		jo.put("data",list);
		
		return jo.toJSONString();
		
	}