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