在JSONArray上从JSONstring中加载JSON

我一直在尝试将JSONstring加载到JSONArray中,遇到一些问题。 我希望这里的post能帮助我解决问题。

该文件位于资产文件夹中,并包含类Kabelskap的对象。 JSONstring格式如下摘录:

[{"driftsmerking":"1420 10 04","objektnummer":"56569.0","adresse":"KANEBOGÅSEN 4","fabrikat":"NEBB","typebetegnelse":"KO500","spenning":"0.23","posisjon":"OK","kompNr":"1420","kommune":"1901 HARSTAD","latitude":"68.7786964342854","longitude":"16.5598512563035"},{"driftsmerking":"4416 01 04","objektnummer":"246349.0","adresse":"NONSÅSEN","fabrikat":"ABB","typebetegnelse":"KO300","spenning":"0.23","posisjon":"OK","kompNr":"4416","kommune":"1911 KVÆFJORD","latitude":"68.7367985627796","longitude":"16.2694481350258"},{"driftsmerking":"4080 05 02","objektnummer":"275933.0","adresse":"KVÆFJORD PLANTESKOLE VEKSTHUS","fabrikat":"ABB","typebetegnelse":"KO700","spenning":"0.23","posisjon":"OK","kompNr":"4080","kommune":"1911 KVÆFJORD","latitude":"68.7712454761326","longitude":"16.1901046355049"},{"driftsmerking":"1383 01 02","objektnummer":"150951.0","adresse":"SKILLEVN. 13","fabrikat":"ABB","typebetegnelse":"","spenning":"0.4","posisjon":"OK","kompNr":"1383","kommune":"1901 HARSTAD","latitude":"68.7781436806564","longitude":"16.5643438120601"},{"driftsmerking":"4085 07 02","objektnummer":"275122.0","adresse":"MATHUSET","fabrikat":"NEBB","typebetegnelse":"70","spenning":"0.23","posisjon":"OK","kompNr":"4085","kommune":"1911 KVÆFJORD","latitude":"68.7721426826508","longitude":"16.1785193494225"}] 

这个string被读入一个stringvariables,然后传递给这个代码段:

 try { JSONObject jsonObj = new JSONObject(finalString); for(int i = 0; i < json.length(); i++){ Kabelskap ks = (Kabelskap) json.get(i); skap.put(ks.objektnummer, ks); } } catch (JSONException e) { e.printStackTrace(); } 

根据我的预期,这应该返回一个JSON数组,然后我可以迭代并将其投射到我的类的对象中。

 11-30 00:31:33.568: INFO/System.out(389): {"driftsmerking":"1420 10 04","objektnummer":"56569.0","adresse":"KANEBOG SEN 4","fabrikat":"NEBB","typebetegnelse":"KO500","spenning":"0.23","posisjon":"OK","kompNr":"1420","kommune":"1901 HARSTAD","latitude":"68.7786964342854","longitude":"16.5598512563035"}{"driftsmerking":"4416 01 04","objektnummer":"246349.0","adresse":"NONS SEN","fabrikat":"ABB","typebetegnelse":"KO300","spenning":"0.23","posisjon":"OK","kompNr":"4416","kommune":"1911 KV FJORD","latitude":"68.7367985627796","longitude":"16.2694481350258"}{"driftsmerking":"4080 05 02","objektnummer":"275933.0","adresse":"KV FJORD PLANTESKOLE VEKSTHUS","fabrikat":"ABB","typebetegnelse":"KO700","spenning":"0.23","posisjon":"OK","kompNr":"4080","kommune":"1911 KV FJORD","latitude":"68.7712454761326","longitude":"16.1901046355049"}{"driftsmerking":"1383 01 02","objektnummer":"150951.0","adresse":"SKILLEVN. 13" of type org.json.JSONObject cannot be converted to JSONArray 11-30 00:31:33.588: WARN/System.err(389): at org.json.JSON.typeMismatch(JSON.java:107) 11-30 00:31:33.588: WARN/System.err(389): at org.json.JSONArray.<init>(JSONArray.java:91) 11-30 00:31:33.588: WARN/System.err(389): at org.json.JSONArray.<init>(JSONArray.java:103) 11-30 00:31:33.588: WARN/System.err(389): at net.lovholm.kraftwerk.Kraftwerk.onCreate(Kraftwerk.java:68) 

这个错误消息表明应该有格式化的问题,但要检查这个我已经testing了一些在线validation器的JSON结构,它似乎是有效的。

从日志返回的string似乎使用了不同于文件UTF-8的编码。 我不确定这是否是问题的一部分,或者这只是日志控制台的字符编码。

对这个问题的任何build议是非常受欢迎的。

—-更新—- —-更新—- —-更新—- —-更新—-

我现在已经用aj.esler的build议更新了代码,它纠正了我在上面的代码摘录中所犯的一些错误。 这是从我的代码更长的摘录,我仍然遇到上述错误消息的问题。 看来这行JSONArray json = new JSONArray(finalString); 导致在JSONArray构造函数中发生恶意行为。 传入的string应该以有效的JSON语法并打开方括号来满足API的要求。

 try { AssetManager assetManager = getAssets(); fis = assetManager.open(sourcePath); BufferedReader bw = new BufferedReader(new InputStreamReader(fis, "utf8")); while ((str = bw.readLine()) != null){ finalString += str; } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } System.out.println(finalString); try { JSONArray json = new JSONArray(finalString); for(int i = 0; i < json.length(); i++){ JSONObject jsonObj = json.getJSONObject(i); try { Kabelskap ks = getKabelskapFromJSON(jsonObj); skap.put(ks.objektnummer, ks); } catch (JSONException e) { e.printStackTrace(); } } } catch (JSONException e) { e.printStackTrace(); } 

—–更新2.0 ——–

System.out.println(finalString)>不确定reader或System.out.println()是否跳过文本的长部分。 我会认为DDMS LogCat使用不支持挪威特殊字母的字符集。

 11-30 11:02:27.888: INFO/System.out(4304): {"driftsmerking":"1420 10 04","objektnummer":"56569.0","adresse":"KANEBOG SEN 4","fabrikat":"NEBB","typebetegnelse":"KO500","spenning":"0.23","posisjon":"OK","kompNr":"1420","kommune":"1901 HARSTAD","latitude":"68.7786964342854","longitude":"16.5598512563035"}{"driftsmerking":"4416 01 04","objektnummer":"246349.0","adresse":"NONS SEN","fabrikat":"ABB","typebetegnelse":"KO300","spenning":"0.23","posisjon":"OK","kompNr":"4416","kommune":"1911 KV FJORD","latitude":"68.7367985627796","longitude":"16.2694481350258"}{"driftsmerking":"4080 05 02","objektnummer":"275933.0","adresse":"KV FJORD PLANTESKOLE VEKSTHUS","fabrikat":"ABB","typebetegnelse":"KO700","spenning":"0.23","posisjon":"OK","kompNr":"4080","kommune":"1911 KV FJORD","latitude":"68.7712454761326","longitude":"16.1901046355049"}{"driftsmerking":"1383 01 02","objektnummer":"150951.0","adresse":"SKILLEVN. 13","fabrikat":"ABB","typebetegnelse":"","spenning":"0.4","posisjon":"OK","kompNr":"1383","kommune":"1901 HARSTAD","latitude":"68.7781436806564","longitude":"16.5643438120601"}{"driftsmerking":"4085 07 02","objektnummer":"275122.0","adresse":"MATHUSET","fabrikat":"NEBB","typebetegnelse":"70","spenning":"0.23","posisjon":"OK","kompNr":"4085","kommune":"1911 KV FJORD","latitude":"68.7721426826508","longitude":"16.1785193494225"}{"driftsmerking":"3410 05 12","objektnummer":"35184.0","adresse":"HANS EGEDESGT. 20 (ERIKSGATE)","fabrikat":"NEBB","typebetegnelse":"","spenning":"0.23","posisjon":"OK","kompNr":"3410","kommune":"1901 HARSTAD","latitude":"68.7980203542316","longitude":"16.538182961594"}{"driftsmerking":"0800 06 10","objektnummer":"266928.0","adresse":"GAMNES V/MAGNE HARALD OLSEN","fabrikat":"ABB","typebetegnelse":"KO35","spenning":"0.23","posisjon":"OK","kompNr":"","kommune":"1901 HARSTAD","latitude":"68.8206299498345","longitude":"16.4915959572276"}{"driftsmerking":"2580 02 02","objektnummer":"186379.0","adresse":"RESSAN","fabrikat":"ELMEK","typebetegnelse":"50 CM","spenning":"0.23","posisjon":"OK","kompNr":"2580","kommune":"1913 SK NLAND","latitude":"68.6729130202412","longitude":"17.127746958547"}{"driftsmerking":"1500 10 06","objektnummer":"193875.0","adresse":"TUVSLETTVN. 9","fabrikat":"ABB","typebetegnelse":"KO500","spenning":"0.23","posisjon":"OK","kompNr":"1500","kommune":"1901 HARSTAD","latitude":"68.74741783798","longitude":"16.5517037722856"}{"driftsmerking":"3282 02 02","objektnummer":"35547.0","adresse":"TEGEB RVN. 12B","fabrikat":"NEBB","typebetegnelse":"","spenning":"0.23","posisjon":"OK","kompNr":"3282","kommune":"1901 HARSTAD","latitude":"68.7991934883357","longitude":"16.5033927383319"}{"driftsmerking":"1430 05 02","objektnummer":"116375.0","adresse":" VERLAND 2","fabrikat":"ABB","typebetegnelse":"KO700","spenning":"0.23","posisjon":"OK","kompNr":"1430","kommune":"1901 HARSTAD","latitude":"68.7759663213591","longitude":"16.5611455110691"}{"driftsmerking":"4150 05 06","objektnummer":"275496.0","adresse":" NYVN. 21","fabrikat":"ABB","typebetegnelse":"KO500","spenning":"0.4","posisjon":"OK","kompNr":"4150","kommune":"1911 KV FJORD","latitude":"68.7741925557284","longitude":"16.1726621696438"}{"driftsmerking":"1486 07 02","objektnummer":"162192.0","adresse":"ROHOLTVN. 7","fabrikat":"ABB","typebetegnelse":"KO 700","spenning":"0.23","posisjon":"OK","kompNr":"1486","kommune":"1901 HARSTAD","latitude":"68.7550368601091","longitude":"16.5679658964195"}{"driftsmerking":"3025 02 06 / 3060 /","objektnummer":"35174.0","adresse":"HANS EGEDESGT. 6 (HVEDINGSGATE)","fabrikat":"NEBB","typebetegnelse":"","spenning":"0.23","posisjon":"OK","kompNr":"3025","kommune":"1901 HARSTAD","latitude":"68.7994885383443","longitude":"16.5414817371666"}{"driftsmerking":"7045 03 06","objektnummer":"251410.0","adresse":"KONGSVIKDALEN","fabrikat":"","typebetegnelse":"","spenning":"0.23","posisjon":"OK","kompNr":"7045","kommune":"1852 TJELDSUND","latitude":"68.5682671357777","longitude":"16.2428412985428"}{"driftsmerking":"3010 03 02","objektnummer":"35143.0","adresse":"6.DIVISJONSGT. 10","fabrikat":"ABB","typebetegnelse":"KO500", 

– 新的更新 –

来自JSONArray(String json)构造函数的完整错误跟踪:

 12-03 15:14:44.290: WARN/System.err(412): org.json.JSONException: Value {"posisjon":"OK","spenning":"0.23","driftsmerking":"1420 10 04","adresse":"KANEBOG SEN 4","kompNr":"1420","objektnummer":"56569.0","typebetegnelse":"KO500","longitude":"16.5598512563035","latitude":"68.7786964342854","kommune":"1901 HARSTAD","fabrikat":"NEBB"} of type org.json.JSONObject cannot be converted to JSONArray 12-03 15:14:44.290: WARN/System.err(412): at org.json.JSON.typeMismatch(JSON.java:107) 12-03 15:14:44.290: WARN/System.err(412): at org.json.JSONArray.<init>(JSONArray.java:91) 12-03 15:14:44.290: WARN/System.err(412): at org.json.JSONArray.<init>(JSONArray.java:103) 12-03 15:14:44.290: WARN/System.err(412): at net.lovholm.kraftwerk.Kraftwerk.onCreate(Kraftwerk.java:66) 12-03 15:14:44.290: WARN/System.err(412): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 12-03 15:14:44.290: WARN/System.err(412): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 12-03 15:14:44.290: WARN/System.err(412): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 12-03 15:14:44.290: WARN/System.err(412): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 12-03 15:14:44.290: WARN/System.err(412): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 12-03 15:14:44.290: WARN/System.err(412): at android.os.Handler.dispatchMessage(Handler.java:99) 12-03 15:14:44.290: WARN/System.err(412): at android.os.Looper.loop(Looper.java:130) 12-03 15:14:44.290: WARN/System.err(412): at android.app.ActivityThread.main(ActivityThread.java:3683) 12-03 15:14:44.290: WARN/System.err(412): at java.lang.reflect.Method.invokeNative(Native Method) 12-03 15:14:44.290: WARN/System.err(412): at java.lang.reflect.Method.invoke(Method.java:507) 12-03 15:14:44.290: WARN/System.err(412): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-03 15:14:44.290: WARN/System.err(412): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-03 15:14:44.290: WARN/System.err(412): at dalvik.system.NativeStart.main(Native Method) 

JSONArray初始化和getKabelskapfromJSON方法的实现:

  1. JSON数组初始化摘录

    尝试{JSONArray json = new JSONArray(finalString);

     for(int i = 0; i < json.length(); i++){ JSONObject jsonObj = json.getJSONObject(i); try { Kabelskap ks = getKabelskapFromJSON(jsonObj); skap.put(ks.objektnummer, ks); } catch (JSONException e) { e.printStackTrace(); } } 

    catch(JSONException e){e.printStackTrace(); }

  2. getKabelselskapFromJSON方法:

    私人Kabelskap getKabelskapFromJSON(JSONObject jsonObj)抛出JSONException {

     String driftsmerking = jsonObj.getString("driftsmerking"); String adresse = jsonObj.getString("addresse"); String objektnummer = jsonObj.getString("objektnummer"); String spenning = jsonObj.getString("spenning"); String fabrikat = jsonObj.getString("fabrikat"); String typebetegnelse = jsonObj.getString("typebetegnelse"); String posisjon = jsonObj.getString("posisjon"); String kompNr = jsonObj.getString("kompNr"); String kommune = jsonObj.getString("kommune"); String latitude = jsonObj.getString("latitude"); String longitude = jsonObj.getString("longitude"); Kabelskap k = new Kabelskap(driftsmerking, objektnummer, adresse, fabrikat, typebetegnelse, spenning, posisjon, kompNr, kommune, latitude, longitude); return k; 

}

Solutions Collecting From Web of "在JSONArray上从JSONstring中加载JSON"

我可以看到一些问题:

  1. 您在第一行使用jsonObj,这是一个JSONObject。 然后在for循环中,使用一个名为json的不同对象。 我将假设这两个是同一个对象。 否则,您的示例中缺less信息。
  2. JSONObject没有获取一个整数的方法。 有一个需要一个string,所以我会认为你的意思是一个。
  3. JSONObject.get返回与你给它的键相对应的数据。 它返回一个Object。

你得到的错误是因为你正试图将一个JSONObject转换成一个Kabelskap。

我会做的是创build一个像下面的帮手方法。 或者,您可以在Kabelstap对象上创build一个特殊的构造函数。

 public Kabelskap getKabelskapFromJSON(JSONObject jsonObj) { Kabelskap k = new Kabelskap(); String driftsmerking = jsonObj.getString("driftsmerking"); k.setDriftsmerking(driftsmerking); String addresse = jsonObj.getString("addresse"); k.setAddresse(addresse); String objektnummer = jsonObj.getString("objektnummer"); k.setObjektNummer(objektnummer); double spenning = jsonObj.getDouble("spenning"); k.setSpenning(spenning); // ... and so on for each property. return k; } 

然后可以像这样使用它:

 try { JSONArray jsonArray = new JSONArray(yourJSONString); for(int i = 0; i < jsonArray.length(); i++) { JSONObject jsonObj = jsonArray.getJSONObject(i); Kabelskap k = getKabelskapFromJSON(jsonObj); // do something with k. eg System.out.println("Kabelskap@"+i+": "+k); } } catch (JSONException e) { e.printStackTrace(); } 

JSONObject的文档在这里 ,JSONArray在这里 。

两件事情,

  1. parsing数据时应该使用JSONArray
  2. 您需要parsingjson并自己创buildKabelskap对象。 json.get(i)将返回Object ,在这种情况下将是JSONObject 。 使用该JSONObject ,然后使用getters获取字段并创build您的Kabelskap对象。