Java读取json数据并存入数据库的操作代码

Java读取json数据并存入数据库

1. pom依赖

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.47</version>
 </dependency>

2.students.json文件

{
  "students": [
    {
      "stuId": 1,
      "stuName": "meilanfang",
      "stuAge": 93
    },
    {
      "stuId": 2,
      "stuName": "zhangguorong",
      "stuAge": 92
    },
    {
      "stuId": 3,
      "stuName": "huangjiaju",
      "stuAge": 91
    }
  ]
}

3.读取json文件方式一

//读取json文件
    public static String readJsonFile(String fileName) {
        String jsonStr = "";
        try {
            File jsonFile = new File(fileName);
            FileReader fileReader = new FileReader(jsonFile);
            Reader reader = new InputStreamReader(new FileInputStream(jsonFile),"utf-8");
            int ch = 0;
            StringBuffer sb = new StringBuffer();
            while ((ch = reader.read()) != -1) {
                sb.append((char) ch);
            }
            fileReader.close();
            reader.close();
            jsonStr = sb.toString();
            return jsonStr;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        String path = JsonTest.class.getClassLoader().getResource("students.json").getPath();
        String s = readJsonFile(path);
        JSONObject jobj = JSON.parseObject(s);
        JSONArray student = jobj.getJSONArray("students");//构建JSONArray数组
        for (int i = 0 ; i < student.size();i++){
            JSONObject key = (JSONObject)student.get(i);
            int stuId= (Integer)key.get("stuId");
            String stuName= (String)key.get("stuName");
            int stuAge= (Integer)key.get("stuAge");
            #TODO 数据库操作
            System.out.println(stuId);
            System.out.println(stuName);
            System.out.println(stuAge);
        }
    }

4.java 通过url下载图片保存到本地

//java 通过url下载图片保存到本地
   public static void download(String urlString, int i) throws Exception {
       // 构造URL
       URL url = new URL(urlString);
       // 打开连接
       URLConnection con = url.openConnection();
       // 输入流
       InputStream is = con.getInputStream();
       // 1K的数据缓冲
       byte[] bs = new byte[1024];
       // 读取到的数据长度
       int len;
       // 输出的文件流
       String filename = "D:\\图片下载/" + i + ".jpg";  //下载路径及下载图片名称
       File file = new File(filename);
       FileOutputStream os = new FileOutputStream(file, true);
       // 开始读取
       while ((len = is.read(bs)) != -1) {
           os.write(bs, 0, len);
       }
       System.out.println(i);
       // 完毕，关闭所有链接
       os.close();
       is.close();
   }

5.获取聚合数据车辆服务

 @Test
    public void doGetTestOne() {
        // 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        // 创建Get请求
        CloseableHttpResponse response = null;

        try {
            // 响应模型

            for(int f=200;f<=300;f++){
                HttpGet httpGet = new HttpGet("http://apis.juhe.cn/cxdq/series?brandid=" + f + "&levelid=&key=XXXXXXXXXXXX");
            // 由客户端执行(发送)Get请求
            response = httpClient.execute(httpGet);
            // 从响应模型中获取响应实体
            HttpEntity responseEntity = response.getEntity();
            System.out.println("响应状态为:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("响应内容长度为:" + responseEntity.getContentLength());
//                System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
                JSONObject object = JSONObject.parseObject(EntityUtils.toString(responseEntity));
                JSONArray arr = object.getJSONArray("result");
                for (int i = 0; i < arr.size(); i++) {
                    JSONObject j = arr.getJSONObject(i);
                    CarBrandDetail vo = new CarBrandDetail();
                    vo.setId(j.getInteger("id"));
                    vo.setName(j.getString("name"));
                    vo.setBrandId(j.getInteger("brandid"));
                    vo.setLevelId(j.getInteger("levelid"));
                    vo.setLevelName(j.getString("levelname"));
                    vo.setSname(j.getString("sname"));
                    vo.setCreateTime(new Date());
                    int insert = carBrandMapper.insert(vo);
                    if (insert > 0) {
                        System.out.println("true");
                    }
                }
            }
        } }catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 释放资源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

ps：java读取json文件把数据存入数据库中

//读取json文件
    public static String readJsonFile(String fileName) {
        String jsonStr = "";
        try {
            File jsonFile = new File(fileName);
            FileReader fileReader = new FileReader(jsonFile);
            Reader reader = new InputStreamReader(new FileInputStream(jsonFile), "utf-8");
            int ch = 0;
            StringBuffer sb = new StringBuffer();
            while ((ch = reader.read()) != -1) {
                sb.append((char) ch);
            }
            fileReader.close();
            reader.close();
            jsonStr = sb.toString();
            return jsonStr;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
 public Result<?> test() {
        String s = readJsonFile("D:\\marks.json");
        JSONObject jobj = JSON.parseObject(s);
        JSONArray jsonArray = jobj.getJSONObject("data").getJSONObject("map_set").getJSONObject("map_code_set")
                .getJSONObject("mapSet").getJSONArray("markers");//构建JSONArray数组
//        JSONArray movies = jobj.getJSONObject("data").getJSONObject("map_set").
// getJSONObject("map_code_set").getJSONObject("mapSet").getJSONArray("polyline");//构建JSONArray数组

        for (int i = 0; i < jsonArray.size(); i++) {
            LongMarchStation longMarchStation = new LongMarchStation();
            JSONObject key = (JSONObject) jsonArray.get(i);
            JSONObject jsonObject = ((JSONObject) jsonArray.get(i)).getJSONObject("callout");
            String id = key.get("id") + "";
            String latitude = key.get("latitude") + "";
            String longitude = key.get("longitude") + "";
            Integer min = (Integer) key.get("min");
            Integer max = (Integer) key.get("max");
            String iconPath = (String) key.get("iconPath");
            String name = (String) jsonObject.get("content");
            longMarchStation.setId(id);
            longMarchStation.setLatitude(latitude);
            longMarchStation.setLongitude(longitude);
            longMarchStation.setMax(max);
            longMarchStation.setMin(min);
            longMarchStation.setName(name);
            longMarchStation.setIconPath(iconPath);
            longMarchStationService.save(longMarchStation);
        }

        return Result.ok("添加成功！");
    }

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