Java读取json数据并存入数据库
1. pom依赖
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<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.47</version> </dependency> |
2.students.json文件
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{ "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
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//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
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//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
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@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
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//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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原文链接：https://blog.csdn.net/hsadfdsahfdsgfds/article/details/112704702
