spring boot框架下返回带键值的Json串

浅浅的花香味﹌ 2022-06-18 12:06 151阅读 0赞

在SpringBoot框架下面返回Json数据非常的简单,只要给对应的Controller添加

@RestController
    这个注解即可
    示例:
    
     @RestController
    @RequestMapping(value = "admin/datas")
    public class DatasController {
        @Autowired
        private ISenddataService senddataService;
        @RequestMapping(value = "/{id}",method= RequestMethod.GET)
        public Senddata getdatas(@PathVariable Integer id){
            return senddataService.findByDeviceId(id);
        }
    }
    我们来看一下输出的Json是什么样的格式:
     [
    {
        "suwd": "24",
        "suyl": "24",
        "jsll": "24",
        "jstds": "24",
        "cstds": "24",
        "ph": "24",
        "yl": "24",
        "ylv": "1",
        "ycy": "24",
        "zd": "24",
        "rjy": "24",
        "d_id": 1,
        "sentem": "20173161723",
        "id": 1
    },
    {
        "suwd": "83.2",
        "suyl": "62.19",
        "jsll": "67.8",
        "jstds": "46.9",
        "cstds": "33.6",
        "ph": "38.3",
        "yl": "29.8",
        "ylv": "23.5",
        "ycy": "27.32",
        "zd": "29.9",
        "rjy": "28.2",
        "d_id": 1,
        "sentem": "20173161830",
        "id": 2
    },
    {
        "suwd": "35.67",
        "suyl": "34.65",
        "jsll": "45.67",
        "jstds": "45.89",
        "cstds": "77.56",
        "ph": "34.54",
        "yl": "42.13",
        "ylv": "13.45",
        "ycy": "24.23",
        "zd": "45.56",
        "rjy": "45.54",
        "d_id": 1,
        "sentem": "2017320530",
        "id": 3
    },
    {
        "suwd": "34",
        "suyl": "35.65",
        "jsll": "45.67",
        "jstds": "57.88",
        "cstds": "34.32",
        "ph": "56.54",
        "yl": "56.98",
        "ylv": "45.76",
        "ycy": "78.65",
        "zd": "67.65",
        "rjy": "23.56",
        "d_id": 1,
        "sentem": "20173201230",
        "id": 4
    },
    {
        "suwd": "69.78",
        "suyl": "64.45",
        "jsll": "45.76",
        "jstds": "34.78",
        "cstds": "24.45",
        "ph": "24.37",
        "yl": "23.89",
        "ylv": "46.38",
        "ycy": "63.26",
        "zd": "69.73",
        "rjy": "49.69",
        "d_id": 1,
        "sentem": "20173201540",
        "id": 5
    },
    {
        "suwd": "64.58",
        "suyl": "23.43",
        "jsll": "54.57",
        "jstds": "45.78",
        "cstds": "57.45",
        "ph": "48.59",
        "yl": "45.56",
        "ylv": "34.78",
        "ycy": "23.45",
        "zd": "59.43",
        "rjy": "39.78",
        "d_id": 1,
        "sentem": "20173201723",
        "id": 6
    },
    {
        "suwd": "54.29",
        "suyl": "34.89",
        "jsll": "58.45",
        "jstds": "49.87",
        "cstds": "45.78",
        "ph": "40.76",
        "yl": "48.87",
        "ylv": "39.98",
        "ycy": "69.45",
        "zd": "58.98",
        "rjy": "34.48",
        "d_id": 1,
        "sentem": "20173202024",
        "id": 7
    },
    {
        "suwd": "67.89",
        "suyl": "59.70",
        "jsll": "45.78",
        "jstds": "48.89",
        "cstds": "45.87",
        "ph": "56.93",
        "yl": "40.90",
        "ylv": "59.89",
        "ycy": "45.68",
        "zd": "49.99",
        "rjy": "46.90",
        "d_id": 1,
        "sentem": "20173202236",
        "id": 8
    },
    {
        "suwd": "35.90",
        "suyl": "39.90",
        "jsll": "58.90",
        "jstds": "74.59",
        "cstds": "59.98",
        "ph": "59.98",
        "yl": "69.94",
        "ylv": "48.89",
        "ycy": "49.98",
        "zd": "54.40",
        "rjy": "59.93",
        "d_id": 1,
        "sentem": "20173202339",
        "id": 9
    }
    ]
    ai？？键呢?
    下面的才是我们需要的Json格式:
    "pm25":{
                "key":"",
    
              "show_desc":0,
    
              "pm25":{
    
                        "curPm":"255",
    
                        "pm25":"227",
    
                        "pm10":"255",
    
                        "level":5,
    
                        "quality":"重度污染",
    
                        "des":"老年人和心脏病、肺病患者应停留在室内，停止户外活动，一般人群减少户外运动。"
    
                    },冷静下来,仔细一想
    这边的
    findByDeviceId()返回的是一个List，转换成Json格式的时候当然会缺少键，额
    下面提供一种解决方法:
    就是将原来放在List中的数据,放到Map中,
    首先需要导入一个第三方的Json库:
    
     
     <dependency>
        <groupId>net.sf.json-lib</groupId>
        <artifactId>json-lib-ext-spring</artifactId>
        <version>1.0.2<version>
     </dependency>
    
    
     private Map<String,Site> siteInfo;//存放Site信息
    
     public JSONObject getSiteAndDevice(String id){
      
            
                List<Site> list=iSiteService.findAll();
                siteInfo=new HashMap<String,Site>();
                for(Site list1:list){
      
                    siteInfo.put(list1.getS_id()+"",list1);//键值为从数据库中查询出来的id好
                }
                JSONObject test=JSONObject.fromObject(siteInfo);
                return test;
    
    }
    
    
    这样就可以得到带键值的Json串了~~