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>
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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
}
]
}
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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);
}
}
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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();
}
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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();
}
}
}
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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.****.net/hsadfdsahfdsgfds/article/details/112704702