讀取XML，並將其存儲在一個字符串

1

基地的調研和我的性實驗我這有一個：

我可以直接訪問屬性：

XmlDocument xml = new XmlDocument(); 
xml.LoadXml(@" 
<DESCIONTREE> 
    <Motion X='296' Y='88' Angle='-90' Direction='up' file='2.jpg' /> 
    <Motion X='384' Y='94' Angle='90' Direction='down' file='2.jpg' /> 
</DESCIONTREE> 
"); 

XmlNodeList xnList = xml.SelectNodes("/DESCIONTREE/Motion"); 


foreach (XmlNode xn in xnList) 
{ 
    Console.WriteLine("{0} {1} {2} {3} {4}", xn.Attributes["X"].Value, xn.Attributes["Y"].Value, xn.Attributes["Angle"].Value, xn.Attributes["Direction"].Value, xn.Attributes["file"].Value); 
}

或者聲明一個類，並使用反序列化。

來源

2013-07-02 06:56:09

2

爲什麼不使用linq2xml

XElement doc=XElement.Load("yourXml.xml"); 
var lst=doc.Elements("Motion") 
    .Select(x=> 
     new 
     { 
     X=x.Attribute("X").Value, 
     Y=x.Attribute("Y").Value, 
     Angle=x.Attribute("Angle").Value, 
     }).ToList();

現在你可以遍歷LST

foreach(var l in lst) 
{ 
    l.X; 
    l.Y; 
    l.Angle; 
}

來源

2013-07-02 06:51:37 Anirudha

+0

「天使」應爲「角度」 :) – Tim

+0

@Tim嘿嘿..：）... – Anirudha

+0

+1有屬性的提示：） –

5

使用LINQ到XML，你可以很容易地解析XML和創建匿名「運動」與X，Y，角度，方向和文件的強類型屬性的對象列表：

XDocument xdoc = XDocument.Load("test.xml") 
var motions = from m in xdoc.Root.Elements("Motion") 
       select new { 
        X = (int)m.Attribute("X"), 
        Y = (int)m.Attribute("Y"), 
        Angle = (int)m.Attribute("Angle"), 
        Direction = (string)m.Attribute("Direction"), 
        File = (string)m.Attribute("file") 
       }; 

foreach(var motion in motions) 
{ 
    // use motion 
    Console.WriteLine(motion); // Dumps all object values 
    Console.WriteLine(motion.Angle); // Writes angle value 
}

來源

2013-07-02 06:52:08

+0

元素或屬性.. :) – Anirudha

+0

@Anirudh oops，謝謝））混合在一起 –

1

這裏是我的類的例子

import java.awt.BorderLayout; 
import java.awt.Dimension; 

import javax.swing.JButton; 
import javax.swing.JFrame; 

public class Main extends JFrame { 
/** 
* 
*/ 
private static final long serialVersionUID = 1L; 
JButton button; 

public static void main(String[] args) { 
    // TODO Auto-generated method stub 
    new Main(); 
} 

public GraphModel model = new GraphModel(); 
public GraphView view; 

public Main() { 
    setPreferredSize(new Dimension(600, 600)); 
    setLocation(100, 100); 
    setLayout(new BorderLayout()); 
    setTitle("Exam prac"); 

    view = new GraphView(model); 
    button = new JButton("Button"); 
    add("North", button); 

    pack(); 
    setVisible(true); 
} 
}

來源

2014-07-17 20:36:23 John

1

下面是另一個類的例子

import java.awt.Color; 
import java.awt.FontMetrics; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.Point; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import java.util.Vector; 

import javax.swing.*; 

public class GraphView extends JPanel implements MouseListener, MouseMotionListener, GraphChangeListener 
{ 
private static final long serialVersionUID = 1L; 
private GraphModel graph; 

public GraphView(final GraphModel graph) 
{ 
    // call inherited constructor (JPanel's) 
    super(); 

    this.graph = graph; 

    addMouseMotionListener(this); 
    addMouseListener(this); 

    graph.addListener(this); 

    setLayout(null); 
} 

@Override 
protected void paintComponent(Graphics g) { 
    // call inherited paint - which clears the background 
    super.paintComponent(g); 

} 

@Override 
public void graphChanged(GraphModel model) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void mouseDragged(MouseEvent e) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void mouseMoved(MouseEvent e) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void mouseClicked(MouseEvent arg0) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void mouseEntered(MouseEvent arg0) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void mouseExited(MouseEvent arg0) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void mousePressed(MouseEvent arg0) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void mouseReleased(MouseEvent arg0) { 
    // TODO Auto-generated method stub 

} 


}

來源

2014-07-17 20:39:24 John

0

這是我而GraphModel類

public class GraphModel 
{ 

GraphChangeListenerQue listenerQ = new GraphChangeListenerQue(); 

public void fireGraphChange() 
{ 
    listenerQ.fireGraphChanged(this); 
} 


public void addListener(GraphChangeListener listener) 
{ 
    listenerQ.addListener(listener); 
} 

}

來源

2014-07-17 20:52:58 John

0

GChangeQue類

import java.util.ArrayList; 

public class GraphChangeListenerQue { 
ArrayList<GraphChangeListener> listeners = new ArrayList<GraphChangeListener>(); 

public void addListener(GraphChangeListener listener) { 
    if (!listeners.contains(listener)) { 
     listeners.add(listener); 
    } 
} 

public void fireGraphChanged(GraphModel source) { 
    for (GraphChangeListener listener : listeners) { 
     listener.graphChanged(source); 
    } 
} 

}

來源

2014-07-17 21:00:26 John

0

GChangeL類

public interface GraphChangeListener 
{ 
    void graphChanged(GraphModel model); 
}

來源

2014-07-17 21:12:48 John

0

主要類的例子

import java.awt.BorderLayout; 
    import java.awt.Color; 
    import java.awt.Component; 
    import java.awt.Dimension; 
    import java.awt.FlowLayout; 
    import java.awt.GridLayout; 
    import java.awt.event.ActionEvent; 
    import java.awt.event.ActionListener; 
    import java.io.FileOutputStream; 
    import java.sql.Connection; 
    import java.sql.DriverManager; 
    import java.sql.ResultSet; 
    import java.sql.SQLException; 
    import java.sql.Statement; 
    import java.util.Vector; 

    import javax.swing.BorderFactory; 
    import javax.swing.DefaultListModel; 
    import javax.swing.ImageIcon; 
    import javax.swing.JButton; 
    import javax.swing.JFileChooser; 
    import javax.swing.JFrame; 
    import javax.swing.JLabel; 
    import javax.swing.JList; 
    import javax.swing.JPanel; 
    import javax.swing.JScrollPane; 
    import javax.swing.JTable; 
    import javax.swing.ListCellRenderer; 
    import javax.swing.border.Border; 
    import javax.swing.event.ListSelectionEvent; 
    import javax.swing.event.ListSelectionListener; 
    import javax.swing.table.DefaultTableModel; 
    import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerConfigurationException; 
import javax.xml.transform.TransformerException; 
import javax.xml.transform.TransformerFactory; 
import javax.xml.transform.dom.DOMSource; 
import javax.xml.transform.stream.StreamResult; 
import javax.xml.xpath.XPath; 
import javax.xml.xpath.XPathFactory; 

import org.w3c.dom.DOMException; 
import org.w3c.dom.DOMImplementation; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.Node; 
import org.w3c.dom.ls.DOMImplementationLS; 
import org.w3c.dom.ls.LSOutput; 
import org.w3c.dom.ls.LSSerializer; 

public class Main extends JFrame implements ActionListener, 
    ListCellRenderer<String> { 
/** 
* 
*/ 
private static final long serialVersionUID = 1L; 
static Main m; 

Connection con = null; 
Statement stmt = null; 
Vector<String> studNumbers; 
DefaultListModel<String> listmodel; 
JList<String> numberlist; 
DefaultTableModel tablemodel; 

JTable table; 
JLabel studnums; 
JLabel surnames; 
JLabel initialss; 
JButton conbtn; 
JButton disc; 
JButton exp; 

String selected; // currently selected student number. 
String filename; 
String CurYear = ""; 
JScrollPane scrollpane; 

Document doc; 
Element studyrecord; 
Element yearofstudy; 

ResultSet resultset; 

public static void main(String[] args) { 
    // TODO Auto-generated method stub 
    m = new Main(); 
    m.setDefaultCloseOperation(EXIT_ON_CLOSE); 

} 

public Main() { 
    BuildUI(); 
    setBounds(100, 100, 685, 600); 
    pack(); 
    setVisible(true); 

} 

private void BuildUI() { 
    setTitle("Study Records"); 
    setLayout(new BorderLayout()); 
    setBackground(Color.gray); 

    JPanel top = new JPanel(); 
    top.setBackground(Color.DARK_GRAY); 
    top.setOpaque(true); 

    conbtn = new JButton("Connect"); 
    conbtn.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      // TODO Auto-generated method stub 
      connect(); 
      Vector<String> tempV = new Vector<String>(); 
      tempV = populateList(); 
      for (int x = 0; x <= tempV.size() - 1; x++) { 
       listmodel.addElement(tempV.get(x)); 
      } 
      conbtn.setEnabled(false); 
      disc.setEnabled(true); 
     } 
    }); 

    disc = new JButton("Disconnect"); 
    disc.setEnabled(false); 
    disc.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      // TODO Auto-generated method stub 
      disconnectDB(); 
      disc.setEnabled(false); 
      conbtn.setEnabled(true); 
      table.setModel(new DefaultTableModel()); 
      surnames.setText(""); 
      studnums.setText(""); 
      initialss.setText(""); 
      numberlist.setModel(new DefaultListModel<String>()); 
     } 
    }); 
    exp = new JButton("Export"); 
    exp.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      // TODO Auto-generated method stub 
      savetoXML(); 
     } 
    }); 

    top.setLayout(new FlowLayout()); 
    top.add(conbtn); 
    top.add(disc); 
    top.add(exp); 
    add("North", top); 

    JPanel left = new JPanel(); 
    left.setPreferredSize(new Dimension(200, 0)); 
    left.setLayout(new BorderLayout()); 
    JLabel SN = new JLabel("Student Numbers"); 
    left.add("North", SN); 

    // List 
    listmodel = new DefaultListModel<String>(); 
    numberlist = new JList<String>(listmodel); 
    JScrollPane scroll = new JScrollPane(numberlist); 

    // Cell Rendering 
    numberlist.setCellRenderer(this); 
    numberlist.addListSelectionListener(new ListSelectionListener() { 

     @Override 
     public void valueChanged(ListSelectionEvent e) { 
      // TODO Auto-generated method stub 
      if (e.getValueIsAdjusting()) { 
       selected = numberlist.getSelectedValue(); 
       studnums.setText(selected); 
       ResultSet result = getStudent(selected); 
       try { 
        while (result.next()) { 
         surnames.setText(result.getString("Surname")); 
         initialss.setText(result.getString("Initials")); 
        } 
       } catch (SQLException e1) { 
        // TODO Auto-generated catch block 
        e1.printStackTrace(); 
       } 

      } 

      tablemodel = (DefaultTableModel) table.getModel(); 
      tablemodel.getDataVector().removeAllElements(); 
      tablemodel.fireTableDataChanged(); 
      populateTable(selected); 
      table.setModel(tablemodel); 
     } 
    }); 

    left.add("Center", scroll); 
    add("West", left); 

    JPanel center = new JPanel(); 
    center.setLayout(new BorderLayout()); 
    JPanel right = new JPanel(); 
    right.setLayout(new GridLayout(3, 2)); 

    JLabel studnum = new JLabel("Student Number:"); 
    JLabel surname = new JLabel("Surname:"); 
    JLabel initials = new JLabel("Initials:"); 

    studnums = new JLabel(""); 
    surnames = new JLabel(""); 
    initialss = new JLabel(""); 

    right.add(studnum); 
    right.add(studnums); 
    right.add(surname); 
    right.add(surnames); 
    right.add(initials); 
    right.add(initialss); 

    center.add("North", right); 
    add(center); 

    // table 
    tablemodel = new DefaultTableModel(); 
    tablemodel.addColumn(new String("Year")); 
    tablemodel.addColumn(new String("ModuleCode")); 
    tablemodel.addColumn(new String("ModuleName")); 
    tablemodel.addColumn(new String("Mark")); 

    table = new JTable(tablemodel); 
    scrollpane = new JScrollPane(table); 
    center.add("Center", scrollpane); 

    // XML 
    try { 
     doc = createDoc(); 
    } catch (Exception e1) { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    } 
    studyrecord = doc.createElement("StudyRecord"); 
    // yearofstudy = doc.createElement("YearofStudy"); 

} 

public String getfilename() { 
    // filename = 
    // "C:\\Users\\user\\Desktop\\WRAP301\\WRAP pracs\\Prac 11.MyStudyRecords.mdb"; 
    JFileChooser dlgOpen = new JFileChooser(); 

    if (dlgOpen.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) { 
     filename = dlgOpen.getSelectedFile().getAbsolutePath(); 
     System.out.println(filename); 
     return filename; 
    } 
    return null; 
} 

public String savefilename() { 
    JFileChooser dlgOpen = new JFileChooser(); 

    if (dlgOpen.showSaveDialog(null) == JFileChooser.APPROVE_OPTION) { 
     filename = dlgOpen.getSelectedFile().getAbsolutePath(); 
     System.out.println(filename); 
     return filename; 
    } 
    return null; 
} 

public void connect() { 
    System.out.println("Establishing connection to database..."); 

    System.out.println(" Loading ODBC driver for MS Access database..."); 
    try { 
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
    } catch (Exception e) { 
     System.out.println(" Unable to load ODBC driver..."); 
     return; 
    } 

    System.out 
      .println(" Use ODBC driver to connect to MS Access database (students.mdb)..."); 
    try { 
     System.out.println(" Locate database to open..."); 

     String file = m.getfilename(); 
     System.out.println(file); 
     String myDB = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=" 
       + file; 
     System.out.println("  Connection string = " + myDB); 

     // create connection to DB 
     con = DriverManager.getConnection(myDB, "", ""); 

     // create statement object for manipulating DB 
     stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, 
       ResultSet.CONCUR_UPDATABLE); 
    } catch (Exception e) { 
     System.out 
       .println(" Unable to connect to DB..." + e.getMessage()); 
    } 

    System.out.println(); 
} 

public void disconnectDB() { 
    System.out.println("Disconnecting from database..."); 

    try { 
     // Important to close connection (same as with files) 
     con.close(); 
    } catch (Exception ex) { 
     System.out.println(" Unable to disconnect from database"); 
    } 
} 

@Override 
public void actionPerformed(ActionEvent e) { 
    // TODO Auto-generated method stub 

} 

public Vector<String> populateList() { 
    Vector<String> list = new Vector<String>(); 
    try { 
     String sql = "SELECT * FROM students"; 
     System.out.println(" Performing query, sql = " + sql); 
     ResultSet result = stmt.executeQuery(sql); 
     System.out.println(); 
     while (result.next()) { 
      String studNo = result.getString("StudentNo"); 
      list.add(studNo); 
     } 
     return list; 
    } catch (Exception e) { 
     return null; 
    } 
} 

public ResultSet getStudent(String student) { 
    try { 
     String sql = "SELECT students.StudentNo, students.Surname, students.Initials, takes.Year, takes.Mark, modules.ModuleCode, modules.ModuleName FROM students INNER JOIN (modules INNER JOIN takes ON modules.[ModuleCode] = takes.[ModuleCode]) ON students.[StudentNo] = takes.[StudentNumber] WHERE (((students.StudentNo)=" 
       + student + "))"; 
     System.out.println(" Performing query, sql = " + sql); 
     ResultSet result = stmt.executeQuery(sql); 
     System.out.println(result.toString()); 
     return result; 
    } catch (Exception e) { 
     e.getMessage(); 
     return null; 
    } 
} 

public void populateTable(String studNum) { 
    ResultSet tempset = getStudent(selected); 

    try { 
     while (tempset.next()) { 
      Vector<String> tempV = new Vector<String>(); 

      tempV.addElement(tempset.getString("Year")); 
      tempV.addElement(tempset.getString("ModuleCode")); 
      tempV.addElement(tempset.getString("ModuleName")); 
      tempV.addElement(tempset.getString("Mark")); 

      tablemodel.addRow(tempV); 
     } 
    } catch (SQLException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
} 

public void savetoXML() { 

    Element report = doc.createElement("Report"); 
    Element student = createStudent(doc); 
    ResultSet studentsetR = getStudent(selected); 
    Element studyrecord = null; 
    String year = ""; 
    // int x=1; 
    try { 
     while (studentsetR.next()) { 
      // System.out.println(studentsetR.getArray(x).toString()); 
      CurYear = studentsetR.getString("Year"); 
      year = CurYear; 
      Element yearofstudy = doc.createElement("Yearofstudy"); 
      studyrecord = createStudyrecord(yearofstudy, studentsetR, 
        CurYear); 
      // x++; 

     } 
    } catch (SQLException e1) { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    } 

    report.appendChild(student); 
    report.appendChild(studyrecord); 
    doc.appendChild(report); 

    try { 
     saveDoc(doc, savefilename()); 
    } catch (Exception e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
} 

public Document createDoc() throws Exception { 
    // create DocumentBuilder to parse XML document 
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
    DocumentBuilder builder = factory.newDocumentBuilder(); 

    // create empty document 
    Document doc = builder.newDocument(); 

    return doc; 
} 

public Element createStudent(Document doc) { 
    Element student = doc.createElement("student"); 
    Element studnum = doc.createElement("studnum"); 
    Element surname = doc.createElement("surname"); 
    Element initials = doc.createElement("initials"); 

    ResultSet studentresult = getStudent(selected); 

    try { 
     while (studentresult.next()) { 
      studnum.appendChild(doc.createTextNode((studentresult 
        .getString("StudentNo")))); 
      surname.appendChild(doc.createTextNode(studentresult 
        .getString("Surname"))); 
      initials.appendChild(doc.createTextNode(studentresult 
        .getString("Initials"))); 
      break; 
     } 
    } catch (SQLException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 

    student.appendChild(studnum); 
    student.appendChild(surname); 
    student.appendChild(initials); 
    return student; 
} 

public Element createStudyrecord(Element yearofstudy, ResultSet studentSet, 
     String Year) { 

    // Element yearofstudy = doc.createElement("YearOfStudy"); 
    Element module = doc.createElement("module"); 

    try { 
     Year = studentSet.getString("Year"); 
     yearofstudy.setAttribute("year", CurYear); 

     yearofstudy.appendChild(module); 
     module.setAttribute("code", studentSet.getString("ModuleCode")); 
     module.setAttribute("mark", studentSet.getString("Mark")); 
     module.setAttribute("name", studentSet.getString("ModuleName")); 
     studyrecord.appendChild(yearofstudy); 

     return studyrecord; 
    } catch (SQLException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    return null; 
} 

public void saveDoc(Document doc, String filename) throws Exception { 
    // obtain serializer 
    DOMImplementation impl = doc.getImplementation(); 
    DOMImplementationLS implLS = (DOMImplementationLS) impl.getFeature(
      "LS", "3.0"); 
    LSSerializer ser = implLS.createLSSerializer(); 
    ser.getDomConfig().setParameter("format-pretty-print", true); 

    // create file to save too 
    FileOutputStream fout = new FileOutputStream(filename); 

    // set encoding options 
    LSOutput lsOutput = implLS.createLSOutput(); 
    lsOutput.setEncoding("UTF-8"); 

    // tell to save xml output to file 
    lsOutput.setByteStream(fout); 

    // FINALLY write output 
    ser.write(doc, lsOutput); 

    // close file 
    fout.close(); 

    // display output on screen to see (note UTF-16 at top) 
    // System.out.println(ser.writeToString(doc)); 
} 

public Component getListCellRendererComponent(JList<? extends String> list, 
     String value, int index, boolean isSelected, boolean cellHasFocus) { 
    Border blackline = BorderFactory.createLineBorder(Color.black); 
    JPanel panel = new JPanel(); 
    panel.setLayout(new BorderLayout()); 

    ResultSet set = getStudent(value); 

    JLabel studnum_label = new JLabel("Stud number:"); 
    JLabel surname_label = new JLabel("Surname:"); 
    JLabel initials_label = new JLabel("Initials:"); 
    JLabel yos_label = new JLabel("Year of study:"); 

    System.out.println("value:" + value); 
    JLabel studnum = new JLabel(value); 
    JLabel surname = new JLabel(""); 
    JLabel initials = new JLabel(""); 
    JLabel yearofStudy = new JLabel(""); 

    try { 
     while (set.next()) { 
      surname = new JLabel(set.getString("Surname")); 
      System.out.println("here"); 
      initials = new JLabel(set.getString("Initials")); 
      // set.last(); 
      yearofStudy = new JLabel(set.getString("Year")); 
     } 
    } catch (SQLException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 

    JPanel center = new JPanel(new GridLayout(4, 2)); 

    center.add(studnum_label); 
    System.out.println("studnum value before adding: " + studnum.getText()); 
    center.add(studnum); 
    center.add(surname_label); 
    System.out.println("surname value before adding: " + surname); 
    center.add(surname); 
    center.add(initials_label); 
    center.add(initials); 
    center.add(yos_label); 
    center.add(yearofStudy); 

    if (isSelected) { 
     studnum_label.setForeground(Color.blue); 
     surname_label.setForeground(Color.blue); 
     initials_label.setForeground(Color.blue); 
     yos_label.setForeground(Color.blue); 
     studnum.setForeground(Color.blue); 
     surname.setForeground(Color.blue); 
     initials.setForeground(Color.blue); 
     yearofStudy.setForeground(Color.blue); 
    } 
    if (cellHasFocus) { 
     studnum_label.setForeground(Color.red); 
     surname_label.setForeground(Color.red); 
     initials_label.setForeground(Color.red); 
     yos_label.setForeground(Color.red); 
     studnum.setForeground(Color.red); 
     surname.setForeground(Color.red); 
     initials.setForeground(Color.red); 
     yearofStudy.setForeground(Color.red); 
    } 

    JLabel title = new JLabel("Student Card"); 
    JLabel image = new JLabel(new ImageIcon("earth.jpg")); 

    panel.add(BorderLayout.NORTH, title); 
    panel.setBorder(blackline); 
    panel.add(BorderLayout.WEST, image); 
    panel.add(BorderLayout.CENTER, center); 

    return panel; 
} 
}

來源

2014-07-17 21:19:42 John

讀取XML，並將其存儲在一個字符串

回答

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