如何获取JTable中列标题的字体和图形

Question

我想要获取JTable中列标题的图形和字体。要做到这一点，我使用

Graphics g = myTable.getColumnModel().getColumn(i).getGraphics(); 
Font f = myTable.getColumnModel().getColumn(i).getFont(); 

但是能产生找不到符号错误代码

此程序的完整的代码

import javax.swing.*; 
import java.awt.*; 
import java.io.*; 
import java.lang.*; 
import java.awt.event.*; 
import javax.swing.event.*; 
import java.util.List; 
import java.util.ArrayList; 
import java.util.Comparator; 
import java.text.*; 
import java.util.*; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.table.*; 
import java.lang.Object.*; 
import javax.swing.text.*; 
import java.awt.FontMetrics; 
import java.awt.Font; 
import java.awt.Graphics; 


public class JtableIe 
{ 
    JFrame myMainWindow = new JFrame("Compare Tables"); 

    JPanel firstPanel = new JPanel(); 

    JScrollPane myScrollTable; 
    JTable myTable; 
    JTextField srchFld1; 
    JTextField srchFld2; 
    TableRowSorter sorter; 
    JLabel srchLbl1 = new JLabel(); 
    JLabel srchLbl2 = new JLabel(); 
    DefaultTableModel model; 

    int testMaxMinSize = 0; 

    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); 
    String []fontFamilies = ge.getAvailableFontFamilyNames(); 

    public void runGUI() 
    { 
     myMainWindow.setBounds(10, 10, 1296, 756); 

     myMainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     myMainWindow.setLayout(new GridLayout(1,1)); 

     createFirstPanel(); 

     myMainWindow.getContentPane().add(firstPanel); 

     myMainWindow.setVisible(true); 
    } 

    public void createFirstPanel() 
    { 
     firstPanel.setLayout(null); 

     srchLbl1.setLocation(0,0); 
     srchLbl1.setSize(150,26); 
     srchLbl1.setText("Name Search:"); 
     firstPanel.add(srchLbl1); 

     srchLbl2.setLocation(660,0); 
     srchLbl2.setSize(150,26); 
     srchLbl2.setText("ID Search:"); 
     firstPanel.add(srchLbl2); 

     String[] aHeaders = {"Name","ID","Number 1","Number 2","Time","Date"}; 
     Object[][] aData = new Object[5][6]; 

     ///////Data//////// 
     aData[0][0] = "John"; 
     aData[0][1] = "JS96"; 
     aData[0][2] = "1"; 
     aData[0][3] = "186"; 
     aData[0][4] = "1h 23m"; 
     aData[0][5] = getJavaDate("12/11/2015"); 

     aData[1][0] = "David"; 
     aData[1][1] = "DB36"; 
     aData[1][2] = "2"; 
     aData[1][3] = "111852"; 
     aData[1][4] = "2h 55m"; 
     aData[1][5] = getJavaDate("12/11/2020"); 

     aData[2][0] = "Daniel"; 
     aData[2][1] = "DK73"; 
     aData[2][2] = "3"; 
     aData[2][3] = "2921"; 
     aData[2][4] = "1h 55m"; 
     aData[2][5] = getJavaDate("12/11/2014"); 

     aData[3][0] = "Janis"; 
     aData[3][1] = "JW84"; 
     aData[3][2] = "4"; 
     aData[3][3] = "6512"; 
     aData[3][4] = "12h 26m"; 
     aData[3][5] = getJavaDate("13/11/2015"); 

     aData[4][0] = "Adam"; 
     aData[4][1] = "AF98"; 
     aData[4][2] = "5"; 
     aData[4][3] = "7524"; 
     aData[4][4] = "5h 47m"; 
     aData[4][5] = getJavaDate("11/11/2015"); 
     ////////////// 
     model = new DefaultTableModel(aData, aHeaders) 
     { 
      @Override 
      public Class<?> getColumnClass(int column) 
      { 
       switch (column) 
       { 
        case 5: return Date.class; 
        default: return Object.class; 
       } 
      } 

      @Override 
      public boolean isCellEditable(int row, int column) 
      { 
       return false;//all cells false 
      } 
     }; 

     myTable = new JTable(model); 

     myTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); 

     myTable.setAutoCreateRowSorter(true); 

     sorter = new TableRowSorter(myTable.getModel()); 
     List sortKeys = new ArrayList(); 
     sortKeys.add(new RowSorter.SortKey(5, SortOrder.ASCENDING)); 
     sorter.setSortKeys(sortKeys); 
     setRenderers(); 
     myTable.setRowSorter(sorter); 

     DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer(); 
     centerRenderer.setHorizontalAlignment(SwingConstants.CENTER); 
     myTable.setDefaultRenderer(Object.class, centerRenderer); 

     DefaultRowSorter sorter = (DefaultRowSorter) myTable.getRowSorter(); 

     setMinPrefMax(); 

     myScrollTable = new JScrollPane(myTable); 
     myScrollTable.setSize(1296,756); 
     myScrollTable.setLocation(0,25); 
     System.out.println("Creating compare table"); 

     srchFld1 = new JTextField(10); 
     srchFld1.setSize(550,26); 
     srchFld1.setLocation(100,0); 
     srchFld1.setToolTipText("Enter Name"); 
     firstPanel.add(srchFld1); 

     srchFld2 = new JTextField(10); 
     srchFld2.setSize(550,26); 
     srchFld2.setLocation(740,0); 
     srchFld2.setToolTipText("Enter ID"); 
     firstPanel.add(srchFld2); 

     ////////////////////// 
     Document doc = srchFld1.getDocument(); 
     DocumentListener listener = new DocumentListener() 
     { 

      @Override 
      public void insertUpdate(DocumentEvent e) 
      { 
       newFilter(); 
      } 

      @Override 
      public void removeUpdate(DocumentEvent e) 
      { 
       newFilter(); 
      } 

      @Override 
      public void changedUpdate(DocumentEvent e) 
      { 
       newFilter(); 
      } 
     }; 
     doc.addDocumentListener(listener); 

     /////////////// 
     Document docb = srchFld2.getDocument(); 
     DocumentListener listenerb = new DocumentListener() { 

      @Override 
      public void insertUpdate(DocumentEvent e) 
      { 
       newFilter(); 
      } 

      @Override 
      public void removeUpdate(DocumentEvent e) 
      { 
       newFilter(); 
      } 

      @Override 
      public void changedUpdate(DocumentEvent e) 
      { 
       newFilter(); 
      } 
     }; 
     docb.addDocumentListener(listenerb); 
     /////////////// 

     firstPanel.add(myScrollTable); 
    } 

    public void setMinPrefMax() 
    { 
     for (int i = 0; i < myTable.getColumnCount(); i++) 
     { 
      String Hello = myTable.getColumnModel().getColumn(i).getHeaderValue()+""; 
      System.out.println(Hello); 
      Graphics g = myTable.getColumnModel().getColumn(i).getGraphics(); 
      Font f = myTable.getColumnModel().getColumn(i).getFont(); 
      FontMetrics metrics = g.getFontMetrics(f); 
      int minLength = metrics.stringWidth(Hello)+10; 
      System.out.println(minLength); 
      myTable.getColumnModel().getColumn(i).setMinWidth(minLength); 
     } 
    } 

    private static final DateFormat DATE_FORMAT = new SimpleDateFormat("dd/MM/yyyy"); 

    private void setRenderers() 
    { 
     DateRenderer dr = new DateRenderer(); 
     dr.setHorizontalAlignment(SwingConstants.CENTER); 
     myTable.setDefaultRenderer(Date.class, dr); 
    } 

    private Date getJavaDate(String s) 
    { 
     try 
     { 
      SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); 
      Date d = sdf.parse(s); 
      return d; 
     } 

     catch (ParseException ex) 
     { 
      Logger.getLogger(TableBasic.class.getName()).log(Level.SEVERE, null, ex); 
      return null; 
     } 
    } 

    private void newFilter() 
    { 
     RowFilter rf = null; 
     try 
     { 
      List<RowFilter<Object,Object>> filters = new ArrayList<RowFilter<Object,Object>>(2); 
      filters.add(RowFilter.regexFilter("(?i)"+srchFld1.getText(), 0)); 
      filters.add(RowFilter.regexFilter("(?i)"+srchFld2.getText(), 1)); 
      rf = RowFilter.andFilter(filters); 
     } 
     catch (java.util.regex.PatternSyntaxException e) 
     { 
      return; 
     } 
     sorter.setRowFilter(rf); 
    } 

    public static void main(String[] args) 
    { 
     JtableIe ji = new JtableIe(); 
     ji.runGUI(); 
    } 

    private class DateRenderer extends DefaultTableCellRenderer 
    { 

     private static final long serialVersionUID = 1L; 

     @Override 
     public Component getTableCellRendererComponent(JTable myTable, Object value, boolean isSelected, boolean hasFocus, int row, int column) { 
      super.getTableCellRendererComponent(myTable, value, isSelected, hasFocus, row, column); 
      if (!(value instanceof Date)) { 
       return this; 
      } 
      setText(DATE_FORMAT.format((Date) value)); 
      return this; 
     } 
    } 
} 

而对于TableBasic代码是

import java.awt.*; 
import java.text.DateFormat; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.*; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.*; 
import static javax.swing.JFrame.EXIT_ON_CLOSE; 
import javax.swing.table.*; 

public class TableBasic { 

    private JFrame frame = new JFrame(); 
    private String[] columnNames = {"Date", "String", "Long", "Boolean"}; 
    private Object[][] data = { 
     {getJavaDate("13-11-2020"), "A", new Double(1), Boolean.TRUE}, 
     {getJavaDate("13-11-2018"), "B", new Double(2), Boolean.FALSE}, 
     {getJavaDate("12-11-2015"), "C", new Double(9), Boolean.TRUE}, 
     {getJavaDate("12-11-2015"), "D", new Double(4), Boolean.FALSE} 
    }; 
    private DefaultTableModel model = new DefaultTableModel(data, columnNames) { 
     @Override 
     public Class<?> getColumnClass(int column) { 
      return getValueAt(0, column).getClass(); 
     } 
    }; 
    private JTable table = new JTable(model); 
    private JScrollPane scrollPane = new JScrollPane(table); 
    private static final DateFormat DATE_FORMAT = new SimpleDateFormat("dd/MM/yyyy"); 

    public TableBasic() { 
     table.setPreferredScrollableViewportSize(table.getPreferredSize()); 
     table.setAutoCreateRowSorter(true); 
     setRenderers(); 
     // DefaultRowSorter has the sort() method 
     table.getRowSorter().toggleSortOrder(0); 
     frame.add(scrollPane); 
     frame.setDefaultCloseOperation(EXIT_ON_CLOSE); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 

    private void setRenderers() { 
     //TableColumnModel m = table.getColumnModel(); 
     //"Integer", "String", "Interger", "Double", "Boolean", "Double", "String", "Boolean", "Date" 
     table.setDefaultRenderer(Date.class, new DateRenderer()); 
    } 

    private Date getJavaDate(String s) { 
     try { 
      SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy"); 
      Date d = sdf.parse(s); 
      return d; 

     } catch (ParseException ex) { 
      Logger.getLogger(TableBasic.class.getName()).log(Level.SEVERE, null, ex); 
      return null; 
     } 
    } 

    public static void main(String[] args) { 

     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       TableBasic frame = new TableBasic(); 
      } 
     }); 
    } 

    private class DateRenderer extends DefaultTableCellRenderer { 

     private static final long serialVersionUID = 1L; 

     @Override 
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { 
      super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); 
      if (!(value instanceof Date)) { 
       return this; 
      } 
      setText(DATE_FORMAT.format((Date) value)); 
      return this; 
     } 
    } 
} 

注意

导致错误的代码是在名为setMinPrefMax()

Answer 1

我能够实现我想要的结果，即使列的最小宽度由列的大小决定头。我通过使用这个代码实现了这一点。

for (int i = 0; i < myTable.getColumnCount(); i++) 
{ 
    JTableHeader tableHeader = myTable.getTableHeader(); 
    FontMetrics headerFontMetrics = tableHeader.getFontMetrics(tableHeader.getFont()); 

    if(tableHeader == null) 
    { 
     return; 
    } 

    int Test = headerFontMetrics.stringWidth(myTable.getColumnName(i)); 
    System.out.println("The width of the column header "+i+" is: "+Test); 
    int minLength = Test+20; 
    myTable.getColumnModel().getColumn(i).setMinWidth(minLength); 
} 

编辑

此代码可用于设置的最小，优选的，并且取决于列标题和细胞约束最大约束。

public static int GetScreenWorkingWidth() 
{ 
    return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width; 
} 

public void setMinPrefMax() 
{ 
    for(int i = 0; i < myTable.getColumnCount(); i++) 
    { 
     ////Min 
     System.out.println("Column "+i); 
     JTableHeader tableHeader = myTable.getTableHeader(); 
     FontMetrics headerFontMetrics = tableHeader.getFontMetrics(tableHeader.getFont()); 

     if(tableHeader == null) 
     { 
      return; 
     } 

     int Test = headerFontMetrics.stringWidth(myTable.getColumnName(i)); 
     System.out.println("The width of the column header "+i+" is: "+Test); 
     int minLength = Test+20; 
     myTable.getColumnModel().getColumn(i).setMinWidth(minLength); 
     ////Pref 
     for(int row=0; row<myTable.getRowCount(); row++) 
     { 
      Font fontF1 = myTable.getFont(); 
      FontMetrics cVFontMetrics = myTable.getFontMetrics(fontF1); 

      System.out.println(myTable.getValueAt(row, i)); 
      String Hello = myTable.getValueAt(row, i)+""; 
      int Test2 = cVFontMetrics.stringWidth(Hello); 
      System.out.println("The length of this string is: "+Test2); 
      if(Test2>testMaxPrefSize) 
      { 
       testMaxPrefSize = Test2; 
      } 
     } 
     System.out.println("The maximum value for cells in column "+i+" is: "+testMaxPrefSize); 
     myTable.getColumnModel().getColumn(i).setPreferredWidth(testMaxPrefSize+20); 
     ////Max 
     int testMaxSize = testMaxPrefSize+300; 

     if(testMaxSize>GetScreenWorkingWidth()) 
     { 
      myTable.getColumnModel().getColumn(i).setMaxWidth(GetScreenWorkingWidth()); 
     } 

     else 
     { 
      myTable.getColumnModel().getColumn(i).setMaxWidth(testMaxSize); 
     } 

     testMaxPrefSize=0; 
    } 
} 

Answer 2

TableColumn延伸对象的方法内循环...这是一个模型对象，不图形之一。

现实情况是，字体/图形的东西都在JTable的TableCellRenderer中完成。所以如果你使用的是自定义的，你可以看看那个类。否则，您需要查看摆动源代码（src.zip）