从url java解析对象的json数组

mbskvtky  于 2021-07-06  发布在  Java
关注(0)|答案(1)|浏览(369)

如何使用java应用程序从外部url解析json对象数组?下面是我正在使用的代码示例:

URL connectionUrl = new URL(/*some url*/);
connection = (HttpURLConnection) connectionUrl.openConnection();

String postData = "/*some post data*/";

connection.setDoOutput(true);
connection.setFixedLengthStreamingMode(postData.length());

OutputStream outputStream = null;
outputStream = connection.getOutputStream();
outputStream.write(postData.getBytes());

if(connection.getResponseCode() == 200) {
  InputStream inputStream = connection.getInputStream();
  BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

  String magicString = "", magicLine;

  while((magicLine = bufferedReader.readLine()) != null) {
    JSONArray jsonArr = new JSONArray(magicLine);

    for(int i = 0; i < jsonArr.length(); i++) {
       JSONObject currentEntity = jsonArr.getJSONObject(i);

  }
}
return magicString;

这是一个json对象数组,在一些外部url上得到回音:

[{"ID":"1","name":"test name","phone":"+37120000000","email":"test@cream.camp","date":"2020-12-17","time":"18:50:00","people_num":"4","active":"0"},{"ID":"2","name":"test name","phone":"+37120000000","email":"test@cream.camp","date":"2020-12-17","time":"18:50:00","people_num":"4","active":"1"}]

很遗憾,应用程序失败,并出现以下错误:

org.json.JSONException: Value Authorization of type java.lang.String cannot be converted to JSONArray
qlfbtfca

qlfbtfca1#

您可以创建一个pojo来保存json响应。使用第三方jar,比如jackson,比如following:-

ObjectMapper mapper = new ObjectMapper();
        try {
            YourPOJO obj = mapper.readValue(new URL("http://jsonplaceholder.typicode.com/posts/7"), YourPOJO.class);
            System.out.println(usrPost);
        } catch (Exception e) {
            e.printStackTrace();
        }

参考https://www.java2novice.com/java-json/jackson/jackson-client-read-from-api-url/

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