之前可能已經(jīng)問過這個(gè)問題，但我不知道我的問題的術(shù)語(yǔ)，因此不知道要查找什么。我正在使用 GSON 和 Java 試圖從解析的 JSONElement 中獲取信息。爪哇代碼： JsonParser parser = new JsonParser(); String url = "https://chapel-logs.herokuapp.com/attendance"; URL obj = new URL(url); HttpURLConnection con = (HttpURLConnection) obj.openConnection(); // optional default is GET con.setRequestMethod("GET"); //add request header con.setRequestProperty("Accept", "application/json"); int responseCode = con.getResponseCode(); System.out.println("\nSending 'GET' request to URL : " + url); System.out.println("Response Code : " + responseCode); BufferedReader in = new BufferedReader( new InputStreamReader(con.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); //print result JsonElement element = parser.parse(response.toString()); if (element.isJsonObject()) { JsonObject albums = element.getAsJsonObject(); System.out.println(albums.get("students")); //prints out data in students System.out.println(albums.get("students.LastChapelAttended")); //error }我的 JSON ：{"students":[{"LastChapelAttended":{"Loc":"","Chapel":"WhyChapel","Year":2018,"Month":9,"Day":6,"Hour":15,"Min":14,"Sec":28},"StudNum":"F02660934","Attendance":17},{"LastChapelAttended":{"Loc":"","Chapel":"WhyChapel","Year":2018,"Month":9,"Day":5,"Hour":19,"Min":49,"Sec":11},"StudNum":"002660934","Attendance":2},{"LastChapelAttended":{"Loc":"","Chapel":"WhyChapel","Year":2018,"Month":9,"Day":4,"Hour":20,"Min":35,"Sec":57},"StudNum":"002643472","Attendance":2},{"LastChapelAttended":{"Loc":"","Chapel":"WhyChapel","Year":2018,"Month":9,"Day":7,"Hour":5,"Min":34,"Sec":54},"StudNum":"002664906","Attendance":1}]}我試圖獲得的數(shù)據(jù)是：LastChapelAttended，但是LastChapelAttended在students. 在 JavaScript 中，students.LastChapelAttended如果有幫助的話，相當(dāng)于我正在嘗試的內(nèi)容。提前致謝！
3 回答
一只萌萌小番薯
TA貢獻(xiàn)1795條經(jīng)驗(yàn) 獲得超7個(gè)贊
JsonObject jObj=(JsonObject)albums.get("students").getAsJsonArray().get(0);
System.out.println(jObj.get("LastChapelAttended"));將其作為 JsonArray 獲取，然后遍歷該數(shù)組以獲取 LastChapelAttended。
不負(fù)相思意
TA貢獻(xiàn)1777條經(jīng)驗(yàn) 獲得超10個(gè)贊
首先，students不是對(duì)象而是數(shù)組。因此students.LastChapelAttended不應(yīng)該在任何語(yǔ)言中工作。如果你想檢索LastChapelAttended數(shù)組中的第一個(gè)學(xué)生students[0].LastChapelAttended應(yīng)該可以工作。
我對(duì)gson不熟悉，但我認(rèn)為你想做的是這樣的：
if (element.isJsonObject()) {
JsonObject albums = element.getAsJsonObject();
JsonArray students = albums.getAsJsonArray("students");
for (JsonElement student : students) {
System.out.println(albums.getAsJsonObject().get("LastChapelAttended"));
}
}
慕姐4208626
TA貢獻(xiàn)1852條經(jīng)驗(yàn) 獲得超7個(gè)贊
Students 是一個(gè) JsonArray LastChapelAttended 是一個(gè) JSONObject 你可以通過調(diào)用得到它
json = (json data)
JsonParser parser = new JsonParser();
JsonObject rootObj = parser.parse(json).getAsJsonObject();
JsonArray studentsArray = rootObj.getAsJsonArray("students");
for (JsonElement stu : studentsArray) {
JsonObject student = stu.getAsJsonObject();
JsonObject LastChapelAttended = student.getAsJsonObject("LastChapelAttended");
}
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