spring boot——json解析示例——fastjson

不念不忘少年蓝@ 2023-09-29 18:40 21阅读 0赞

### 多层嵌套JSON类型数据解析 ###

**简单来说：**

> “key”:“value” --> 此时value为String
> 
> “key":0 --> 此时value为int
> 
> “key”:\{“k1”:“v1”\} --> 此时value为JSONObject
> 
> “key”:\[v\] --> 此时value为JSONArray

=======================================================================================

![28355ec6658ae2caf6e27784845bf6c6.png][]

========================================================================================

{
        "error": 0,
        "status": "success",
        "results": [
            {
                "currentCity": "青岛",
                "index": [
                    {
                        "title": "穿衣",
                        "zs": "较冷",
                        "tipt": "穿衣指数",
                        "des": "建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。"
                    },
                    {
                        "title": "紫外线强度",
                        "zs": "中等",
                        "tipt": "紫外线强度指数",
                        "des": "属中等强度紫外线辐射天气，外出时建议涂擦SPF高于15、PA+的防晒护肤品，戴帽子、太阳镜。"
                    }
                ]
            }
        ]
    }

package org.example.common;
    
    import com.alibaba.fastjson.JSONArray;
    import com.alibaba.fastjson.JSONObject;
    
    public class TestJson002
    {
        public static void main(String[] args)
        {
    
            String s = "{\"error\":0,\"status\":\"success\",\"results\":[{\"currentCity\":\"青岛\",\"index\":[{\"title\":\"穿衣\",\"zs\":\"较冷\",\"tipt\":\"穿衣指数\",\"des\":\"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。\"},{\"title\":\"紫外线强度\",\"zs\":\"最弱\",\"tipt\":\"紫外线强度指数\",\"des\":\"属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。\"}],}]}";
    
            //把字符串转换为json对象
            JSONObject jsonObject = JSONObject.parseObject(s);
    
            System.out.println("-------------------------------------------1");
    
    
            //验证是否包含某个key
            Boolean a = jsonObject.containsKey("error");
            System.out.println(a);
    
            Boolean b = jsonObject.containsKey("errorbd");
            System.out.println(b);
    
    
            System.out.println("-------------------------------------------2");
    
            //提取出error为 0
            int error = jsonObject.getIntValue("error");
            System.out.println("error:" + error);
    
            System.out.println("-------------------------------------------3");
    
    
            //提取出status为 success
            String status = jsonObject.getString("status");
            System.out.println("status:" + status);
    
            System.out.println("-------------------------------------------4");
    
    
    
    
            //注意：results中的内容带有中括号[]，所以要转化为JSONArray类型的对象
            JSONArray result = jsonObject.getJSONArray("results");
    
            for (int i = 0; i < result.size(); i++)
            {
    
                //提取出currentCity为 青岛
                String currentCity = result.getJSONObject(i).getString("currentCity");
    
                System.out.println("currentCity:" + currentCity);
    
                //注意：index中的内容带有中括号[]，所以要转化为JSONArray类型的对象
                JSONArray index = result.getJSONObject(i).getJSONArray("index");
    
                for (int j = 0; j < index.size(); j++)
                {
    
                    String title = index.getJSONObject(j).getString("title");
                    System.out.println("title:" + title);
    
                    String zs = index.getJSONObject(j).getString("zs");
                    System.out.println("zs:" + zs);
    
                    String tipt = index.getJSONObject(j).getString("tipt");
                    System.out.println("tipt:" + tipt);
    
                    String des = index.getJSONObject(j).getString("des");
                    System.out.println("des:" + des);
    
                }
            }
            
    
        }
    
    }

![d2d1cea4ca8ade505ecd217ccdea74d4.png][]

![09093070a205a9002aed4844c8688bf4.png][]

执行结果：

![e772091daf75a6107a588104a332bf38.png][]

引入依赖：

<dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.72</version>
            </dependency>

![4e989f5961affbaef26281345c27b11e.png][]

[28355ec6658ae2caf6e27784845bf6c6.png]: https://img-blog.csdnimg.cn/img_convert/28355ec6658ae2caf6e27784845bf6c6.png
[d2d1cea4ca8ade505ecd217ccdea74d4.png]: https://img-blog.csdnimg.cn/img_convert/d2d1cea4ca8ade505ecd217ccdea74d4.png
[09093070a205a9002aed4844c8688bf4.png]: https://img-blog.csdnimg.cn/img_convert/09093070a205a9002aed4844c8688bf4.png
[e772091daf75a6107a588104a332bf38.png]: https://img-blog.csdnimg.cn/img_convert/e772091daf75a6107a588104a332bf38.png
[4e989f5961affbaef26281345c27b11e.png]: https://img-blog.csdnimg.cn/img_convert/4e989f5961affbaef26281345c27b11e.png