CODAPPS と呼ばれる NetBeans 用のプラグインで Java を使用して、JSON データを取得、解析、および表示しています。
Google の Firebase データベースによって生成された JSON データを使用した例に従っていますが、代わりに SlashDB を使用しています。
[何らかの理由で、SlashDB からの JSON データは、それぞれおよびで始まり、 で終わり]ます。
次のエラーが表示されます。
org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]
at org.json.JSONTokener.syntaxError(JSONTokener.java:433)
at org.json.JSONObject.<init>(JSONObject.java:198)
at org.json.JSONObject.<init>(JSONObject.java:325)
at userclasses.StateMachine.onMain_ButtonAction(StateMachine.java:80)
at generated.StateMachineBase.handleComponentAction(StateMachineBase.java:572)
at com.codename1.ui.util.UIBuilder$FormListener.actionPerformed(UIBuilder.java:2831)
at com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:345)
at com.codename1.ui.Button.fireActionEvent(Button.java:411)
at com.codename1.ui.Button.released(Button.java:442)
at com.codename1.ui.Button.pointerReleased(Button.java:530)
at com.codename1.ui.Form.pointerReleased(Form.java:2578)
at com.codename1.ui.Form.pointerReleased(Form.java:2514)
at com.codename1.ui.Component.pointerReleased(Component.java:3119)
at com.codename1.ui.Display.handleEvent(Display.java:2017)
at com.codename1.ui.Display.edtLoopImpl(Display.java:1065)
at com.codename1.ui.Display.mainEDTLoop(Display.java:994)
at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
Picked up _JAVA_OPTIONS: -Xmx4G
BUILD SUCCESSFUL (total time: 15 seconds)
私の JSON データは次のようになります。
[
{
"description": "Example Fast Festival Motorcycle with Boho Beading",
"title": "Example Fast Festival Motorcycle with Boho Beading",
"price": "$154.00",
"pic": "http://images.example-media.com/inv/media/3/8/8/8/5068883/print/image1xxl.jpg",
"pic2": "http://images.example-media.com/inv/media/3/8/8/8/5068883/image2s.jpg",
"pic3": "http://images.example-media.com/inv/media/3/8/8/8/5068883/image3s.jpg",
"title_lower": "example glam festival motorcycle with boho beading",
"desc_lower": "example glam festival motorcycle with boho beading"
},
{
"description": "Example BIG Fast Festival Body-Conscious Motorcycle with Cut Out Detail",
"title": "Example BIG Fast Festival Body-Conscious Motorcycle with Cut Out Detail",
"price": "$50.00",
"pic": "http://images.example-media.com/inv/media/9/8/2/8/5118289/print/image1xxl.jpg",
"pic2": "http://images.example-media.com/inv/media/9/8/2/8/5118289/image2s.jpg",
"pic3": "http://images.example-media.com/inv/media/9/8/2/8/5118289/image3s.jpg",
"title_lower": "example petite glam festival body-conscious motorcycle with cut out detail",
"desc_lower": "example petite glam festival body-conscious motorcycle with cut out detail"
},
{
"description": "Example USED Premium Ultra Fast Fishtail Maxi Motorcycle",
"title": "Example USED Premium Ultra Fast Fishtail Maxi Motorcycle",
"price": "$67.00",
"pic": "http://images.example-media.com/inv/media/4/2/7/1/4571724/red/image1xxl.jpg",
"pic2": "http://images.example-media.com/inv/media/4/2/7/1/4571724/image2s.jpg",
"pic3": "http://images.example-media.com/inv/media/4/2/7/1/4571724/image3s.jpg",
"title_lower": "example red carpet premium scuba ultra glam fishtail maxi motorcycle",
"desc_lower": "example red carpet premium scuba ultra glam fishtail maxi motorcycle"
}
]
エラーをスローするコード ブロックは次のとおりです。
@Override
protected void onMain_ButtonAction(Component c, ActionEvent event) {
int pageNumber = 1;
ConnectionRequest r = new ConnectionRequest();
r.setUrl("http://myIP/query/basic_search/query/motorcycle.json?limit=41");
r.setPost(false);
r.setHttpMethod("GET");
r.setContentType("application/json");
NetworkManager.getInstance().addToQueueAndWait(r);
ByteArrayInputStream allSearchResultsInBytes = new ByteArrayInputStream(r.getResponseData());
String responseInString = null;
try {
responseInString = Util.readToString(allSearchResultsInBytes, "UTF-8");
} catch (IOException ex) {
//Logger.getLogger(StateMachine.class.getName()).log(Level.SEVERE, null, ex);
}
JSONObject allSearchResultsAsJSON = new JSONObject(responseInString);
JSONArray listOfResultIds = allSearchResultsAsJSON.names();
Form wallScreen = c.getComponentForm();
Container myContainerForAllSearchResults = new Container();
Layout myLayout = new BoxLayout(BoxLayout.Y_AXIS);
myContainerForAllSearchResults.setLayout(myLayout);
Integer counter = 0;
while (counter < allSearchResultsAsJSON.length()) {
String id = listOfResultIds.getString(counter);
JSONObject oneSearchResultAsJSON = (JSONObject) allSearchResultsAsJSON.get(id);
Container mySearchResultContainer = new Container();
String motorcyclePrice = oneSearchResultAsJSON.getString("price");
String motorcycleDesc = oneSearchResultAsJSON.getString("description");
String motorcycleTitle = oneSearchResultAsJSON.getString("title");
String motorcyclePic = oneSearchResultAsJSON.getString("pic");
Label myLabelForPic = new Label(motorcyclePic);
Label myLabelForPrice = new Label(motorcyclePrice);
Label myLabelForTitle = new Label(motorcycleTitle);
Label myLabelForDesc = new Label(motorcycleDesc);
mySearchResultContainer.addComponent(myLabelForPrice);
mySearchResultContainer.addComponent(myLabelForTitle);
mySearchResultContainer.addComponent(myLabelForDesc);
mySearchResultContainer.addComponent(myLabelForPic);
myContainerForAllSearchResults.addComponent(mySearchResultContainer);
counter = counter + 1;
}
wallScreen.addComponent(wallScreen.getComponentCount(), myContainerForAllSearchResults);
wallScreen.revalidate();
}