读取以结尾的JSON数据
我正在使用带有NetBeans插件的Java，称为CODAPPS来检索，解析和显示JSON数据。
我正在关注一个使用Google Firebase数据库生成的JSON数据的示例，但我使用的是SlashDB。
由于某种原因，来自SlashDB的JSON数据分别以[和]开头和结尾。
我收到以下错误：
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.(JSONObject.java:198) at org.json.JSONObject.(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)
我的JSON数据如下所示：
[ { "description": "Example Fast Festival Motorcycle with Boho Beading", "title": "Example Fast Festival Motorcycle with Boho Beading", "price": "$154.00", "pic": "http://sofzh.miximages.com/java/image1xxl.jpg", "pic2": "http://sofzh.miximages.com/java/image2s.jpg", "pic3": "http://sofzh.miximages.com/java/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://sofzh.miximages.com/java/image1xxl.jpg", "pic2": "http://sofzh.miximages.com/java/image2s.jpg", "pic3": "http://sofzh.miximages.com/java/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://sofzh.miximages.com/java/image1xxl.jpg", "pic2": "http://sofzh.miximages.com/java/image2s.jpg", "pic3": "http://sofzh.miximages.com/java/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" } ]
抛出错误的代码块是：
@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(); }
使用new JSONArray(responseInString)而不是new JSONObject(responseInString) 。
您的输入字符串（responseInstring）是一个JSON 数组 ，而不是JSON 对象本身。
改变这一行：
JSONObject allSearchResultsAsJSON = new JSONObject(responseInString);
为此：
JSONArray allSearchResultsAsJSON = new JSONArray(responseInString);
并使用不同的方法索引allSearchResultsAsJSON因为.names方法仅适用于JSONObject而不是JSONArray。