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java - 如何解析 JSON 数据以绑定(bind)依赖下拉菜单？

转载 作者：行者123 更新时间：2023-11-30 03:20:50 24 4
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我有这种格式的 JSON: enter image description here

{"Engineering":{ "Electrical Engineering":{ "ResearchStaff":["research associate","research sciencetist","senior researchsciencetist"], "Non-tenure-track":["research professaor","associateresearch professor","assistant research profesor","clinicalprofesor","clinical associate profesor","clinical assistantprofesor","visiting profesor","visiting associate profesor","visitingassistant profesor"], "Professional Staff":["businessmanager","university research administrator","departmentadministrative assistant"]},

"Computer Science":{ "Research Staff":["research associate","researchsciencetist","senior research sciencetist"], "Tenured":["distinguishedprofessor","professor","associate professor","assistant professor"],"Teaching Faculty":["distinguished professor","professor","associateprofessor","assistant professor"]},

"Computer Engineering":{"Tenured":["distinguishedprofessor","professor","associate professor","assistant professor"],"Teaching Faculty":["lecturer","senior lecturer","adjunct professor"],"Professional Staff":["business manager","university researchadministrator","department administrative assistant"]}

},

"Science":{ "Physics":{ "Research Staff":["researchassociate","research sciencetist","senior research sciencetist"],"Teaching Faculty":["lecturer","senior lecturer","adjunct professor"],"Non-Tenured-Track":["research professaor","associate researchprofessor","assistant research profesor","clinical profesor","clinicalassociate profesor","clinical assistant profesor","visitingprofesor","visiting associate profesor","visiting assistantprofesor"]},

"Chemistry":{ "Tenured":["distinguishedprofessor","professor","associate professor","assistant professor"],"Teaching Faculty":["lecturer","senior lecturer","adjunct professor"],"Non-Tenured-Track":["research professaor","associate researchprofessor","assistant research profesor","clinical profesor","clinicalassociate profesor","clinical assistant profesor","visitingprofesor","visiting associate profesor","visiting assistantprofesor"]}

}

}

这里我想绑定(bind) 4 个下拉菜单，其值如下:学院:{“工程”、“科学”}院系:选择“工程”学院时为{“电气工程”、“计算机科学”}，选择“理科”学院时为{“物理”、“化学”}。

此外，在“电气工程”部门内，我们必须将{“研究人员”、“非终身教授”、“专业人员”}绑定(bind)到职位类型下拉列表中，并根据其选择，我需要绑定(bind)职位如果选择“研究人员”职位类型，则标题下拉列表为{“研究助理”、“研究科学家”、“高级研究科学家”}，依此类推......

如何解析此静态 JSON 数据并将这些下拉列表分别绑定(bind)到彼此选择的值。

最佳答案

使用 XML 可能更容易做到这一点。让我为您提供使用 XML 的完整解决方案。如果您想尝试使用 JSON 解析器，则必须根据自己的需求调整此解决方案。好的，让我们开始...首先，访问这个网站...

http://www.json.org/java/

...并将以下文件下载到名为:org.json;

的新 java 包中
  • JSONArray.java
  • JSONException.java
  • JSONObject.java
  • JSONString.java
  • JSONStringer.java
  • JSONTokener.java
  • JSONWriter.java
  • XML.java
  • XMLTokener.java

我自己做了这个，并编写了一个小程序将 JSON 字符串转换为 XML:

import org.json.JSONObject;
import org.json.XML;

public class example {

public static void main(String[] args) {
    JSONObject json = new JSONObject(getJSONSting() );
    String xml = XML.toString(json);
    System.out.println(xml);
}

private static final String getJSONSting() {
    String data = "{\"Engineering\":{ \"Electrical Engineering\":{ \"Research Staff\":[\"research associate\",\"research sciencetist\",\"senior research sciencetist\"], \"Non-tenure-track\":[\"research professaor\",\"associate research professor\",\"assistant research profesor\",\"clinical profesor\",\"clinical associate profesor\",\"clinical assistant profesor\",\"visiting profesor\",\"visiting associate profesor\",\"visiting assistant profesor\"], \"Professional Staff\":[\"business manager\",\"university research administrator\",\"department administrative assistant\"]},";
           data += "\"Computer Science\":{ \"Research Staff\":[\"research associate\",\"research sciencetist\",\"senior research sciencetist\"], \"Tenured\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"], \"Teaching Faculty\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"]}, \"Computer Engineering\":{\"Tenured\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"], \"Teaching Faculty\":[\"lecturer\",\"senior lecturer\",\"adjunct professor\"], \"Professional Staff\":[\"business manager\",\"university research administrator\",\"department administrative assistant\"]}";
           data += "},";
           data += "\"Science\":{ \"Physics\":{ \"Research Staff\":[\"research associate\",\"research sciencetist\",\"senior research sciencetist\"], \"Teaching Faculty\":[\"lecturer\",\"senior lecturer\",\"adjunct professor\"], \"Non-Tenured-Track\":[\"research professaor\",\"associate research professor\",\"assistant research profesor\",\"clinical profesor\",\"clinical associate profesor\",\"clinical assistant profesor\",\"visiting profesor\",\"visiting associate profesor\",\"visiting assistant profesor\"]},";
           data += "\"Chemistry\":{ \"Tenured\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"], \"Teaching Faculty\":[\"lecturer\",\"senior lecturer\",\"adjunct professor\"], \"Non-Tenured-Track\":[\"research professaor\",\"associate research professor\",\"assistant research profesor\",\"clinical profesor\",\"clinical associate profesor\",\"clinical assistant profesor\",\"visiting profesor\",\"visiting associate profesor\",\"visiting assistant profesor\"]}";
           data += "}";
           data += "}";
        return data;
    }
}

这里是 XML 格式，您会注意到标签中非法使用空格。我的解决方案中解决了这个问题，因此您可以研究代码以了解我如何纠正问题......

<Engineering>
    <Computer Science>
        <Tenured>distinguished professor</Tenured>
        <Tenured>professor</Tenured>
        <Tenured>associate professor</Tenured>
        <Tenured>assistant professor</Tenured>
        <Research Staff>research associate</Research Staff>
        <Research Staff>research sciencetist</Research Staff>
        <Research Staff>senior research sciencetist</Research Staff>
        <Teaching Faculty>distinguished professor</Teaching Faculty>
        <Teaching Faculty>professor</Teaching Faculty>
        <Teaching Faculty>associate professor</Teaching Faculty>
        <Teaching Faculty>assistant professor</Teaching Faculty>
    </Computer Science>
    <Electrical Engineering>
        <Professional Staff>business manager</Professional Staff>
        <Professional Staff>university research administrator</Professional Staff>
        <Professional Staff>department administrative assistant</Professional Staff>
        <Research Staff>research associate</Research Staff>
        <Research Staff>research sciencetist</Research Staff>
        <Research Staff>senior research sciencetist</Research Staff>
        <Non-tenure-track>research professaor</Non-tenure-track>
        <Non-tenure-track>associate research professor</Non-tenure-track>
        <Non-tenure-track>assistant research profesor</Non-tenure-track>
        <Non-tenure-track>clinical profesor</Non-tenure-track>
        <Non-tenure-track>clinical associate profesor</Non-tenure-track>
        <Non-tenure-track>clinical assistant profesor</Non-tenure-track>
        <Non-tenure-track>visiting profesor</Non-tenure-track>
        <Non-tenure-track>visiting associate profesor</Non-tenure-track>
        <Non-tenure-track>visiting assistant profesor</Non-tenure-track>
    </Electrical Engineering>
    <Computer Engineering>
        <Tenured>distinguished professor</Tenured>
        <Tenured>professor</Tenured>
        <Tenured>associate professor</Tenured>
        <Tenured>assistant professor</Tenured>
        <Professional Staff>business manager</Professional Staff>
        <Professional Staff>university research administrator</Professional Staff>
        <Professional Staff>department administrative assistant</Professional Staff>
        <Teaching Faculty>lecturer</Teaching Faculty>
        <Teaching Faculty>senior lecturer</Teaching Faculty>
        <Teaching Faculty>adjunct professor</Teaching Faculty>
    </Computer Engineering>
</Engineering>
<Science>
    <Chemistry>
        <Tenured>distinguished professor</Tenured>
        <Tenured>professor</Tenured>
        <Tenured>associate professor</Tenured>
        <Tenured>assistant professor</Tenured>
        <Non-Tenured-Track>research professaor</Non-Tenured-Track>
        <Non-Tenured-Track>associate research professor</Non-Tenured-Track>
        <Non-Tenured-Track>assistant research profesor</Non-Tenured-Track>
        <Non-Tenured-Track>clinical profesor</Non-Tenured-Track>
        <Non-Tenured-Track>clinical associate profesor</Non-Tenured-Track>
        <Non-Tenured-Track>clinical assistant profesor</Non-Tenured-Track>
        <Non-Tenured-Track>visiting profesor</Non-Tenured-Track>
        <Non-Tenured-Track>visiting associate profesor</Non-Tenured-Track>
        <Non-Tenured-Track>visiting assistant profesor</Non-Tenured-Track>
        <Teaching Faculty>lecturer</Teaching Faculty>
        <Teaching Faculty>senior lecturer</Teaching Faculty>
        <Teaching Faculty>adjunct professor</Teaching Faculty>
    </Chemistry>
    <Physics>
        <Non-Tenured-Track>research professaor</Non-Tenured-Track>
        <Non-Tenured-Track>associate research professor</Non-Tenured-Track>
        <Non-Tenured-Track>assistant research profesor</Non-Tenured-Track>
        <Non-Tenured-Track>clinical profesor</Non-Tenured-Track>
        <Non-Tenured-Track>clinical associate profesor</Non-Tenured-Track>
        <Non-Tenured-Track>clinical assistant profesor</Non-Tenured-Track>
        <Non-Tenured-Track>visiting profesor</Non-Tenured-Track>
        <Non-Tenured-Track>visiting associate profesor</Non-Tenured-Track>
        <Non-Tenured-Track>visiting assistant profesor</Non-Tenured-Track>
        <Research Staff>research associate</Research Staff>
        <Research Staff>research sciencetist</Research Staff>
        <Research Staff>senior research sciencetist</Research Staff>
        <Teaching Faculty>lecturer</Teaching Faculty>
        <Teaching Faculty>senior lecturer</Teaching Faculty>
        <Teaching Faculty>adjunct professor</Teaching Faculty>
    </Physics>
</Science>

如果您已经完成了这一步，您可以通过复制以下类来完成项目的其余部分。我已经测试了该解决方案，它似乎工作正常。

这就是看起来完成的样子...

enter image description here

第一个类放置在包org.combobox中:

package org.combobox;

import java.util.ArrayList;
import java.util.List;

import org.w3c.dom.Node;

public class CleanNode {

  private String _name;
  private List<CleanNode> _nodes = new ArrayList<CleanNode>();

  public CleanNode(Node node) {
    _name = node.getNodeType() == Node.TEXT_NODE ? node.getNodeValue() : node.getNodeName();
  }

  private String getName() {
    return _name;
  }

  public CleanNode addChild(Node node) {
    CleanNode foundNode = null;
    String nodeName = node.getNodeName();
    for(CleanNode child : _nodes){
      if(child.getName().equals(nodeName)) {
        foundNode = child;
        break;
      }
    }
    if(foundNode == null) {
      foundNode = new CleanNode(node);
        _nodes.add(foundNode);
    }
    return foundNode;
  }

  public List<CleanNode> getNodes(){
    return _nodes;
  }

  public String toString() {
    return _name.replace("_", " ");
  }
}

第二个类放置在包org.combobox中:

package org.combobox;

import java.awt.BorderLayout;
import java.awt.Font;
import java.io.IOException;
import java.io.StringReader;
import java.util.Enumeration;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.json.JSONObject;
import org.json.XML;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class ComboBoxChain extends JFrame {
  private static final long serialVersionUID = 1L;
  private static String _xml;
    private Node _root;
    private CleanNode _cleanNode;

  public ComboBoxChain() throws ParserConfigurationException, SAXException, IOException {
    super("ComboBox Chain");
    setUIFont (new javax.swing.plaf.FontUIResource("Monospaced",Font.PLAIN,14));
    buildXML();
    cleanXML();
    _root = parse(_xml);
    _cleanNode = new CleanNode(_root);
    addCleanNodeChildren(_cleanNode, _root);

    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    getContentPane().add(new ComboPanel(_cleanNode), BorderLayout.CENTER);
    pack();
    setResizable(false);
    setLocationRelativeTo(null);
  }

  private void addCleanNodeChildren(CleanNode cleanNode, Node node) {
    if(node.getChildNodes() != null) {
        NodeList children = node.getChildNodes();
      for(int index = 0; index < children.getLength(); index++){
        Node child = children.item(index);
        CleanNode cleanChild = cleanNode.addChild(child);
        addCleanNodeChildren(cleanChild, child);
      }
    }
  }

  protected Node getRootNode() {
    return _root;
  }

  private void cleanXML() {
    String xml = _xml;
    int beginIndex = -1;
    int endIndex = -1;

    for(int index = 0; index < _xml.length(); index++) {
      if(_xml.charAt(index) == '<') {
        beginIndex = index;
      }
      else if (_xml.charAt(index) == '>') {
        endIndex = index;
        String originalTag = _xml.substring(beginIndex, endIndex + 1);
        String newTag = originalTag;
        while(newTag.contains(" ")) {
          newTag = newTag.replace(" ", "_");
        }
        xml = xml.replace(originalTag, newTag);
      }
    }
    _xml = xml;
  }

  private static final void buildXML() {
    String data = "{\"Engineering\":{ \"Electrical Engineering\":{ \"Research Staff\":[\"research associate\",\"research sciencetist\",\"senior research sciencetist\"], \"Non-tenure-track\":[\"research professaor\",\"associate research professor\",\"assistant research profesor\",\"clinical profesor\",\"clinical associate profesor\",\"clinical assistant profesor\",\"visiting profesor\",\"visiting associate profesor\",\"visiting assistant profesor\"], \"Professional Staff\":[\"business manager\",\"university research administrator\",\"department administrative assistant\"]},";
    data += "\"Computer Science\":{ \"Research Staff\":[\"research associate\",\"research sciencetist\",\"senior research sciencetist\"], \"Tenured\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"], \"Teaching Faculty\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"]}, \"Computer Engineering\":{\"Tenured\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"], \"Teaching Faculty\":[\"lecturer\",\"senior lecturer\",\"adjunct professor\"], \"Professional Staff\":[\"business manager\",\"university research administrator\",\"department administrative assistant\"]}";
    data += "},";
    data += "\"Science\":{ \"Physics\":{ \"Research Staff\":[\"research associate\",\"research sciencetist\",\"senior research sciencetist\"], \"Teaching Faculty\":[\"lecturer\",\"senior lecturer\",\"adjunct professor\"], \"Non-Tenured-Track\":[\"research professaor\",\"associate research professor\",\"assistant research profesor\",\"clinical profesor\",\"clinical associate profesor\",\"clinical assistant profesor\",\"visiting profesor\",\"visiting associate profesor\",\"visiting assistant profesor\"]},";
    data += "\"Chemistry\":{ \"Tenured\":[\"distinguished professor\",\"professor\",\"associate professor\",\"assistant professor\"], \"Teaching Faculty\":[\"lecturer\",\"senior lecturer\",\"adjunct professor\"], \"Non-Tenured-Track\":[\"research professaor\",\"associate research professor\",\"assistant research profesor\",\"clinical profesor\",\"clinical associate profesor\",\"clinical assistant profesor\",\"visiting profesor\",\"visiting associate profesor\",\"visiting assistant profesor\"]}";
    data += "}";
    data += "}";

    JSONObject json = new JSONObject(data);
    _xml = "<Root>" + XML.toString(json) + "</Root>";

    System.out.println(_xml);

  }

  private static final void setUIFont (javax.swing.plaf.FontUIResource f){
    Enumeration<Object> keys = UIManager.getDefaults().keys();
    while (keys.hasMoreElements()) {
      Object key = keys.nextElement();
      Object value = UIManager.get (key);
      if (value != null && value instanceof javax.swing.plaf.FontUIResource) {
        UIManager.put (key, f);
      }
    }
  }

  private static final Node parse(String XMLContent) throws ParserConfigurationException, SAXException, IOException {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document document = builder.parse(new InputSource(new StringReader(XMLContent)));
    return document.getDocumentElement();
  }

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        ComboBoxChain frame;
        try {
          frame = new ComboBoxChain();
          frame.setVisible(true);
        }
        catch (ParserConfigurationException e) {
          e.printStackTrace();
        }
        catch (SAXException e) {
          e.printStackTrace();
        }
        catch (IOException e) {
          e.printStackTrace();
        }
      }
    });
  }
}

第三个类放在包org.combobox中:

package org.combobox;

import java.awt.BorderLayout;
import java.awt.GridLayout;

import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class ComboPanel extends JPanel  {
  private static final long serialVersionUID = 1L;

  private static final String DEPARTMENT = "Department";
  private static final String PROGRAM = "Program";
  private static final String FACULTY = "Faculty";
  private static final String ACADEMIC_RANK = "Academic Rank";

  private JComboBox<CleanNode> _department;
  private JComboBox<CleanNode> _program;
  private JComboBox<CleanNode> _faculty;
  private JComboBox<CleanNode> _rank;

  private DependencyLink _rankLink;
  private DependencyLink _facultyLink;
  private DependencyLink _programLink;
  private DependencyLink _departmentLink;

  public ComboPanel(CleanNode root) {
    super(new BorderLayout());
    addCombos(root);
  }

  private void addCombos(CleanNode root) {
    _department = new JComboBox<CleanNode>();
    _program = new JComboBox<CleanNode>();
    _faculty = new JComboBox<CleanNode>();
    _rank = new JComboBox<CleanNode>();

    _rankLink = new DependencyLink(_rank, null);
    _facultyLink = new DependencyLink(_faculty, _rankLink);
    _programLink = new DependencyLink(_program, _facultyLink);
    _departmentLink = new DependencyLink(_department, _programLink);
    _departmentLink.populate(root);

    JPanel panel = new JPanel();
    panel.setLayout(new GridLayout(4, 2));
    panel.add(new JLabel("                            " + DEPARTMENT + " : "));
    panel.add(_department);
    panel.add(new JLabel("                               " + PROGRAM + " : "));
    panel.add(_program);
    panel.add(new JLabel("                               " + FACULTY + " : "));
    panel.add(_faculty);
    panel.add(new JLabel("                         " + ACADEMIC_RANK + " : "));
    panel.add(_rank);

    add(panel, BorderLayout.CENTER);
  }
}

第四个也是最后一个类位于包org.combobox中:

package org.combobox;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;
import javax.swing.JComboBox;

public class DependencyLink implements ActionListener {

  private boolean _isLocked;
  private JComboBox<CleanNode>_combo;
  private DependencyLink _childLink;
  private CleanNode _previousNode;

  public DependencyLink(JComboBox<CleanNode>combo, DependencyLink childLink) {
    _combo = combo;
    _combo.addActionListener(this);
    _childLink = childLink;
  }

  public void actionPerformed(ActionEvent e) {
    CleanNode node = (CleanNode)_combo.getSelectedItem();
    if(node != _previousNode) {
      updateChild();
      _previousNode = node;
    }
  }

  private void updateChild() {
    if( _childLink != null) {
      if(!_isLocked) {
        _childLink.populate((CleanNode)_combo.getSelectedItem());
      }
    }
  }

  public void populate(CleanNode parentNode) {
    _isLocked = true;
    _combo.removeAllItems();
    if(parentNode != null) {
      List<CleanNode> children = parentNode.getNodes();
      if(!children.isEmpty()) {
        for(CleanNode childNode : children) {
          _combo.addItem(childNode);
        }
        _combo.setSelectedItem(children.get(0));
      }
    }
    _isLocked = false;
    updateChild();
  }
}

研究代码并根据自己的需要进行调整以实现您自己的实现。

祝你好运，康斯坦丁

关于java - 如何解析 JSON 数据以绑定(bind)依赖下拉菜单？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31372818/

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