我正在尝试将标签的文本设置为Hashmap中的值，但是我只获得为标签重复的HashMap的最后一个值。我希望我的标签与此类似-> Reference Image
但是我只能得到这个-> My Image
我尝试了许多不同的方法来遍历HashMap，但是它们都导致我仅获得每个标签的HashMap的最后一个值。
这是我的代码：
调用api并解析Json的类->我使用地图，但是如果您知道更好的方法，请告诉我
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class EventfulApi implements EventsAPIInterface {
private static HttpURLConnection connection;
//Constants
private static String baseUrl = "http://api.eventful.com/json/";
private static String apiKey = "&app_key=KH7kFfxFkzKGnkLf";
private static String categories = "categories/list?&";
//Event Request URL's
private static final String musicEvents = "events/search?keywords=music&";
private static final String comedyEvents = "events/search?keywords=comedy&";
private static final String educationEvents = "events/search?keywords=education&";
private static final String festivalEvents = "events/search?keywords=festival&";
private static final String exhibitsEvents = "events/search?keywords=exhibits&";
private static final String attractionEvents = "events/search?keywords=attractions&";
/**
*
* @param _zipcode
* @return
* @throws JSONException
* @throws MalformedURLException
* @throws ProtocolException
* @throws IOException
*/
@Override
public ArrayList<Map> loadCategories() throws JSONException, MalformedURLException, ProtocolException, IOException {
BufferedReader reader;
String line;
StringBuffer responseContent = new StringBuffer();
URL url = new URL(baseUrl + categories + apiKey);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
int status = connection.getResponseCode();
ArrayList<Map> mapsOfCategories = new ArrayList<Map>();
if (status > 299) {
reader = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
while ((line = reader.readLine()) != null) {
responseContent.append(line);
}
reader.close();
} else {
reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
while ((line = reader.readLine()) != null) {
responseContent.append(line);
}
reader.close();
}
JSONObject obj = new JSONObject(responseContent.toString());
JSONArray arr = (JSONArray) obj.get("category");
Map<Integer, String> categoriesMap = new LinkedHashMap<Integer, String>();
JSONObject categories;
for (int i = 0; i < arr.length(); i++) {
categories = (JSONObject) arr.get(i);
categoriesMap.put(i, categories.getString("name").replaceAll("&", "and"));
}
mapsOfCategories.add(categoriesMap);
connection.disconnect();
return mapsOfCategories;
}
/**
*
* @param _zipcode
* @return
* @throws JSONException
* @throws MalformedURLException
* @throws ProtocolException
* @throws IOException
*/
@Override
public ArrayList<Map> loadComedyEventsByZipcode(int _zipcode) throws JSONException, MalformedURLException, ProtocolException, IOException {
BufferedReader reader;
String line;
StringBuffer responseContent = new StringBuffer();
URL url = new URL(baseUrl + comedyEvents + "l=" + _zipcode + "&within=25&units=miles&" + apiKey);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
int status = connection.getResponseCode();
ArrayList<Map> mapsOfMusicEvents = new ArrayList<Map>();
if (status > 299) {
reader = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
while ((line = reader.readLine()) != null) {
responseContent.append(line);
}
reader.close();
} else {
reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
while ((line = reader.readLine()) != null) {
responseContent.append(line);
}
reader.close();
}
JSONObject obj = new JSONObject(responseContent.toString());
JSONObject events = obj.getJSONObject("events");
JSONArray arr = events.getJSONArray("event");
Map<Integer, String> musicEventsMap = new HashMap<Integer, String>();
JSONObject titles;
for (int i = 0; i < arr.length(); i++) {
titles = arr.getJSONObject(i);
musicEventsMap.put(i, titles.getString("title"));
}
mapsOfMusicEvents.add(musicEventsMap);
connection.disconnect();
return mapsOfMusicEvents;
}
}
接口类->
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.util.ArrayList;
import java.util.Map;
import org.json.JSONException;
public interface EventsAPIInterface {
public ArrayList<Map> loadComedyEventsByZipcode(int _zipcode) throws JSONException, MalformedURLException, ProtocolException, IOException;
public ArrayList<Map> loadCategories() throws JSONException, MalformedURLException, ProtocolException, IOException;
}
适配器类->
import java.io.IOException;
import java.net.ProtocolException;
import java.util.ArrayList;
import java.util.Map;
import org.json.JSONException;
public class EventsAPIAdapter {
protected static final EventsAPIInterface currentlyUsedApi = (EventsAPIInterface) new EventfulApi();
public ArrayList<Map> loadComedyEventsByZipcode(int _zipcode) throws JSONException, ProtocolException, IOException{
return EventsAPIAdapter.currentlyUsedApi.loadComedyEventsByZipcode(_zipcode);
}
public ArrayList<Map> loadCategories() throws JSONException, ProtocolException, IOException{
return EventsAPIAdapter.currentlyUsedApi.loadCategories();
}
}
模型类->
import java.io.IOException;
import java.util.ArrayList;
import java.util.Map;
import org.json.JSONException;
public class EventsModel {
private int zipcode;
private Map comedyEventVenueMap;
private Map categoriesMap;
private static final int comedyEventMapINDEX = 0;
private static final int categoriesMapINDEX = 0;
protected final static EventsAPIAdapter adapter = new EventsAPIAdapter();
public static EventsModel loadEventsByZipcode(int _zipcode) throws IOException, JSONException{
EventsModel useModel = new EventsModel();
ArrayList<Map> tempStorageForMaps = adapter.loadComedyEventsByZipcode(_zipcode);
useModel.setZipcode(_zipcode);
Map comedyMap = tempStorageForMaps.get(comedyEventMapINDEX);
useModel.setComedyEventVenueMap(comedyMap);
return useModel;
}
public static EventsModel loadCategories() throws IOException, JSONException{
EventsModel useModel = new EventsModel();
ArrayList<Map> tempStorageForMaps = adapter.loadCategories();
Map categoriesMap = tempStorageForMaps.get(categoriesMapINDEX);
useModel.setCategoriesMap(categoriesMap);
return useModel;
}
//================= GETTERS ===============
public int getZipcode() {
return zipcode;
}
public Map getComedyEventVenueMap() {
return comedyEventVenueMap;
}
public Map getCategoriesMap() {
return categoriesMap;
}
//================= SETTERS ===============
public void setZipcode(int zipcode) {
this.zipcode = zipcode;
}
public void setComedyEventVenueMap(Map musicEventVenueMap) {
this.comedyEventVenueMap = musicEventVenueMap;
}
public void setCategoriesMap(Map categoriesMap) {
this.categoriesMap = categoriesMap;
}
}
控制器类->
import Controller.EventsModel;
import java.io.IOException;
import java.util.Map;
import javafx.scene.image.ImageView;
import org.json.JSONException;
public class EventsController {
public EventsController() {
}
private int zipcode;
protected EventsModel eventsModel = new EventsModel();
//================= GETTERS ===============
public Map getComedyMap() throws IOException, JSONException {
this.eventsModel = eventsModel.loadEventsByZipcode(this.zipcode);
return this.eventsModel.getComedyEventVenueMap();
}
public Map getCategoriesMap() throws IOException, JSONException{
this.eventsModel = eventsModel.loadCategories();
return this.eventsModel.getCategoriesMap();
}
}
启动应用程序的主类->
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class EventsUI extends Application {
@Override
public void start(Stage _stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("Events.fxml"));
Scene scene = new Scene(root);
_stage.setScene(scene);
_stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
我正在尝试将标签设置为HashMap的主屏幕类->
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ListView;
import java.io.IOException;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Insets;
import javafx.geometry.Orientation;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.FlowPane;
import org.json.JSONException;
import View.EventsController;
public class EventsView implements Initializable {
@FXML
protected ListView<String> categoriesListView;
private FlowPane eventsFlowPane;
@FXML
private ScrollPane eventsScrollPane;
protected Map<Integer, String> categoriesMap;
private EventsController eventsController = new EventsController();
// Builds the poster flow pane by populating with poster views
private void buildEventsFlowPane() throws JSONException, IOException {
// Build a flow pane layout with the width and size of the
eventsFlowPane = new FlowPane(Orientation.HORIZONTAL);
eventsFlowPane.setHgap(50);
eventsFlowPane.setVgap(10);
eventsFlowPane.setPadding(new Insets(10, 8, 4, 8));
// bind to scroll pane width
eventsFlowPane.prefWrapLengthProperty().bind(eventsScrollPane.widthProperty());
this.categoriesMap = eventsController.getCategoriesMap();
for (int i = 0; i < this.categoriesMap.size(); i++) {
AnchorPane posterPane = buildEventPane();
eventsFlowPane.getChildren().add(posterPane);
}
eventsScrollPane.setContent(eventsFlowPane);
}
// Builds the pane
private AnchorPane buildEventPane() throws JSONException, IOException
{
try
{
FXMLLoader loader = new FXMLLoader();
loader.setLocation(EventsView.class.getResource("EventsMainScreenView.fxml"));
AnchorPane posterView = loader.load();
EventsMainScreen controller = loader.getController();
for (int i = 0; i < this.categoriesMap.size(); i++) {
controller.getEventName().setText((String) this.categoriesMap.get(i));
}
return posterView;
}
catch (IOException ex){
System.err.println("Failed to load");
ex.printStackTrace();
}
return null;
}
/**
* This method adds the categories to the listview
*/
public void addCategoriesToList() throws IOException, JSONException {
this.categoriesMap = eventsController.getCategoriesMap();
for (int i = 0; i < this.categoriesMap.size(); i++) {
this.categoriesListView.getItems().add((String) this.categoriesMap.get(i));
}
}
@Override
public void initialize(URL url, ResourceBundle rb) {
try {
addCategoriesToList();
} catch (IOException ex) {
Logger.getLogger(EventsView.class.getName()).log(Level.SEVERE, null, ex);
} catch (JSONException ex) {
Logger.getLogger(EventsView.class.getName()).log(Level.SEVERE, null, ex);
}
try {
try {
buildEventsFlowPane();
} catch (IOException ex) {
Logger.getLogger(EventsView.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (JSONException ex) {
Logger.getLogger(EventsView.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
我传递给MainScreen的Pan类，以创建多个Poster（我知道我应该重命名该类）
public class EventsMainScreen
{
@FXML
private Label eventName;
@FXML
private ImageView eventImage;
@FXML
private AnchorPane eventAcPane;
public AnchorPane ACP(){
return eventAcPane;
}
public Label getEventName() {
return eventName;
}
public void newLabel(){
eventName = new Label();
// return eventName;
}
public void setEventName(Label eventName) {
this.eventName = eventName;
}
public ImageView getEventImage() {
return eventImage;
}
public void setEventImage(ImageView eventImage) {
this.eventImage = eventImage;
}
}
EventsView FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.ScrollPane?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="800.0" prefWidth="1333.0" stylesheets="@css.css" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="View.EventsView">
<left>
<VBox fx:id="mMovieTypeVBox" alignment="TOP_CENTER" prefHeight="709.0" prefWidth="273.0" spacing="8.0" styleClass="pane" stylesheets="@css.css" BorderPane.alignment="CENTER">
<children>
<Label styleClass="titleLabel" text="Explore" />
<ListView fx:id="categoriesListView" prefHeight="664.0" prefWidth="185.0" VBox.vgrow="ALWAYS" />
</children>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="6.0" />
</padding>
</VBox>
</left>
<center>
<AnchorPane prefHeight="687.0" prefWidth="997.0" BorderPane.alignment="CENTER">
<children>
<ScrollPane fx:id="eventsScrollPane" hbarPolicy="NEVER" layoutX="22.0" prefHeight="709.0" prefWidth="1138.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="2.0" AnchorPane.topAnchor="0.0">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" />
</content>
</ScrollPane>
</children>
</AnchorPane>
</center>
<bottom>
<HBox alignment="BOTTOM_LEFT" spacing="10.0" BorderPane.alignment="CENTER">
<padding>
<Insets bottom="4.0" left="10.0" right="10.0" top="4.0" />
</padding>
</HBox>
</bottom>
<top>
<VBox styleClass="pane" stylesheets="@css.css" BorderPane.alignment="CENTER">
<children>
<MenuBar prefHeight="50.0" prefWidth="80.0" styleClass="pane" stylesheets="@css.css">
<menus>
<Menu mnemonicParsing="false" text="Profile">
<items>
</items>
</Menu>
</menus>
</MenuBar>
<HBox alignment="BASELINE_LEFT" spacing="20.0">
<children>
<Label prefHeight="16.0" prefWidth="123.0" text="Search Events" />
<Label fx:id="test" prefHeight="21.0" prefWidth="723.0" text="Label" />
</children>
<padding>
<Insets bottom="6.0" left="10.0" right="10.0" top="6.0" />
</padding>
</HBox>
</children>
</VBox>
</top>
</BorderPane>
EventsMainScreen FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.VBox?>
<AnchorPane fx:id="eventAcPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="200.0" prefWidth="120.0" styleClass="posterPane" stylesheets="@Main_Styles.css" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="View.EventsMainScreen">
<children>
<VBox alignment="TOP_CENTER" prefHeight="200.0" prefWidth="120.0" spacing="4.0" styleClass="pane" stylesheets="@css.css" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<ImageView fx:id="eventImage" fitHeight="179.0" fitWidth="122.0" pickOnBounds="true" preserveRatio="true" />
<Label fx:id="eventName" styleClass="subtitle" text="Label" wrapText="true" />
</children>
</VBox>
</children>
</AnchorPane>
EventsView类中的Anchor Pane方法是我的主要问题所在，categoryMap.get（i）仅返回地图中的最后一个值，我也尝试过使用：
int count = 0;
for(int i = 0; i < categoriesMap.size(); i++){
count++;
然后controller.getEventName（）。setText（（String）this.categoriesMap.get（count））;
但是那也不起作用
任何建议都非常感谢，谢谢。
没有测试您的代码，我想您的错误是在此代码部分中：
// Builds the pane
private AnchorPane buildEventPane() throws JSONException, IOException
{
try
{
FXMLLoader loader = new FXMLLoader();
loader.setLocation(EventsView.class.getResource("EventsMainScreenView.fxml"));
AnchorPane posterView = loader.load();
EventsMainScreen controller = loader.getController();
for (int i = 0; i < this.categoriesMap.size(); i++) {
controller.getEventName().setText((String) this.categoriesMap.get(i));
}
return posterView;
}
catch (IOException ex){
System.err.println("Failed to load");
ex.printStackTrace();
}
return null;
}
检查EventsMainScreen controller = loader.getController();确实是在创建控制器对象的新instance。还要检查您是否没有重构具有相同label文本的控制器的所有实例。这就是为什么您在for循环的最后一次运行中获得相同结果的原因。
尝试创建新的控制器实例，并使用setController对其进行显式设置，如下例所示：
EventsMainScreen controller = new EventsMainScreen();
loader.setController(controller);
// after that -> load it
AnchorPane posterView = loader.load();