java 解析Json对象（嵌套json数组）

野性酷女 2023-07-13 10:56 37阅读 0赞

在这里我需要读取的是json数据中promote的img的url，name，shopPrice。   
1.实体类   
![20160908161534292][]

2.工具类Moblie\_Utils根据url获取网络json格式数据

public class Moblie_Utils {
    public static String loadJson(String url) {
        StringBuilder json = new StringBuilder();
        try {
            URL urlObject = new URL(url);
            URLConnection uc = urlObject.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(uc.getInputStream()));
            String inputLine = null;
            while ((inputLine = in.readLine()) != null) {
                json.append(inputLine);
            }
         //   System.out.println("json.toString()====="+json.toString());
            in.close();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return json.toString();
    }}

3.json数据格式,json中包含嵌套json数组

{
    "data": {
        "promote": [
            {
                "id": 24,
                "goods_id": 24,
                "brief": null,
                "img": {
                    "thumb": "http://image/1_0.jpg",
                    "url": "http://image/1_0.jpg",
                    "small": "http://image/1_0.jpg"
                },
                "market_price": "0.0",
                "name": "F2000",
                "promote_price": "",
                "shop_price": "0.01"
            },
            {
                "id": 92,
                "goods_id": 92,
                "brief": null,
                "img": {
                    "thumb": "http://image/1_0.jpg",
                    "url": "http://image/1_0.jpg",
                    "small": "http://image/1_0.jpg"
                },
                "market_price": "0.0",
                "name": "23000",
                "promote_price": "",
                "shop_price": "0.01"
            }
    
        ],
        "player": [
            {
                "action": null,
                "action_id": null,
                "description": null,
                "photo": {
                    "thumb": null,
                    "url": "http://image/1_0.jpg",
                    "small": null
                },
                "url": ""
            },
            {
                "action": null,
                "action_id": null,
                "description": null,
                "photo": {
                    "thumb": null,
                    "url": "http://image/1_0.jpg",
                    "small": null
                },
                "url": ""
            }
        ]
    },
    "status": {
        "succeed": 1,
        "error_code": null,
        "error_desc": null
    },
    "paginated": null,
    "session": null

4.控制层controller中

@Controller
    @RequestMapping("/moblieHome")
    public class Moblie_IndexController {
       @RequestMapping(value = "/hotSale",produces = "text/html;charset=UTF-8")
        public String mobileHomeCategory(Model model){
        String url="http://xxxxx/home/data";
        String homeDataJsonArrayString=Moblie_Utils.loadJson(url);
        JSONObject jsonObject=null;
        jsonObject= JSON.parseObject(homeDataJsonArrayString);
        String data=jsonObject.getString("data");
        if(data!=null &&data.length()>0){
            System.out.println("data==="+data);
        }
        jsonObject= JSON.parseObject(data);
        String promote_goods=jsonObject.getString("promote_goods");
        if(data!=null &&data.length()>0){
            System.out.println("promote_goods==="+promote_goods);
        }
        JSONArray jsonArray =jsonObject.getJSONArray("promote_goods");
        JSONArray jsonArrayImg=null;
        JSONObject object=null;
        JSONObject objectImg=null;
        List<MobileGoodsBrief> goodsList = new ArrayList<MobileGoodsBrief>();
        MobileGoodsBrief good=null;
        if(jsonArray!=null && jsonArray.size()>0) {
            for (int i = 0; i < jsonArray.size(); i++) {
                object = jsonArray.getJSONObject(i);
            good=new MobileGoodsBrief();
                good.setShopPrice(object.getString("shop_price"));
                good.setPrice(object.getString("market_price"));
                good.setName(object.getString("name"));
                objectImg = JSON.parseObject(object.getString("img").toString());
                good.setImgUrl(objectImg.getString("url"));
                goodsList.add(good);
            }
        }
        model.addAttribute("goodsList",goodsList);
        return "index.jsp";
    }

5.controller传值给jsp,   
jsp头部注意添加c标签：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <%@ taglib prefix="t" uri="http://tiles.apache.org/tags-tiles"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <!DOCTYPE html>
    <html>
    <head>
    </head>
    <body>
    <div>
    <ul class="good">
    <c:forEach items="${goodsList}" var="t">
    <li>
        <a target="_blank" href="jump/67939165">
            <img src="${t.imgUrl}"/>
        </a>
        <a target="_blank" href="jump/67939165">
        <h1><i class="ico13"><img src="${t.imgUrl}"></i> ${t.name}</h1>
        <div class="list-price buy">
            <i>￥</i><span class="price-new">${t.shopPrice}</span>
            <i class="del">/￥${t.price}</i>
            <span class="good-btn"><i class="ico15">
            <img src="images/sts.png"/>
            </i> 去抢购
             </span>
        </div>
        </a>
    </li>
    </c:forEach>
    </ul>
    </div>
    </body>
    </html>

[20160908161534292]: https://img-blog.csdn.net/20160908161534292