filemodel.java

java swing 开发代码

// FileModel.java
// A custom table model to display information on a directory of files.
//
package	jswing.ch15;

import javax.swing.table.*;
import java.util.Date;
import java.io.File;

public class FileModel extends AbstractTableModel {

  String titles[] = new String[] {
    "Directory?", "File Name", "Read?", "Write?", "Size", "Last Modified"
  };

  Class types[] = new Class[] { 
    Boolean.class, String.class, Boolean.class, Boolean.class,
    Number.class, Date.class
  };
      
  Object data[][];

  public FileModel() { this("."); }

  public FileModel(String dir) {
    File pwd = new File(dir);
    setFileStats(pwd);
  }

  // Implement the methods of the TableModel interface we're interested
  // in.  Only getRowCount(), getColumnCount() and getValueAt() are
  // required.  The other methods tailor the look of the table.
  public int getRowCount() { return data.length; }
  public int getColumnCount() { return titles.length; }
  public String getColumnName(int c) { return titles[c]; }
  public Class getColumnClass(int c) { return types[c]; }
  public Object getValueAt(int r, int c) { return data[r][c]; }

  //  Our own method for setting/changing the current directory
  // being displayed.  This method fills the data set with file info
  // from the given directory.  It also fires an update event so this
  // method could also be called after the table is on display.
  public void setFileStats(File dir) {
    String files[] = dir.list();
    data = new Object[files.length][titles.length];

    for (int i=0; i < files.length; i++) {
      File tmp = new File(files[i]);
      data[i][0] = new Boolean(tmp.isDirectory());
      data[i][1] = tmp.getName();
      data[i][2] = new Boolean(tmp.canRead());
      data[i][3] = new Boolean(tmp.canWrite());
      data[i][4] = new Long(tmp.length());
      data[i][5] = new Date(tmp.lastModified());
    }

    // Just in case anyone's listening...
    fireTableDataChanged();
  }
}