java实现变更文件查询的方法

/* * * 更改所生成文件模板为 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释 */package com.cn.wangk.tools;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Component;import java.awt.Container;import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Calendar;import java.util.GregorianCalendar;import javax.swing.BorderFactory;import javax.swing.JButton;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JPanel;/** *//** * Bean to display a month calendar in a JPanel. Only works for the Western * calendar. *  * @author Ian F. Darwin, http://www.darwinsys.com/ * @version $Id: Cal.java,v 1.5 2004/02/09 03:33:45 ian Exp $ */public class Cal extends JPanel{ /** *//** The currently-interesting year (not modulo 1900!) */ protected int yy; /** *//** Currently-interesting month and day */ protected int mm, dd; /** *//** The buttons to be displayed */ protected JButton labs[][]; /** *//** The number of day squares to leave blank at the start of this month */ protected int leadGap = 0; /** *//** A Calendar object used throughout */ Calendar calendar = new GregorianCalendar(); /** *//** Today's year */ protected final int thisYear = calendar.get(Calendar.YEAR); /** *//** Today's month */ protected final int thisMonth = calendar.get(Calendar.MONTH); /** *//** One of the buttons. We just keep its reference for getBackground(). */ private JButton b0; /** *//** The month choice */ private JComboBox monthChoice; /** *//** The year choice */ private JComboBox yearChoice; /** *//**  * Construct a Cal, starting with today.  */ Cal(){  super();  setYYMMDD(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),    calendar.get(Calendar.DAY_OF_MONTH));  buildGUI();  recompute(); } /** *//**  * Construct a Cal, given the leading days and the total days  *   * @exception IllegalArgumentException  *        If year out of range  */ Cal(int year, int month, int today){  super();  setYYMMDD(year, month, today);  buildGUI();  recompute(); } private void setYYMMDD(int year, int month, int today){  yy = year;  mm = month;  dd = today; } String[] months ={ "January", "February", "March", "April", "May", "June",   "July", "August", "September", "October", "November", "December" }; /** *//** Build the GUI. Assumes that setYYMMDD has been called. */ private void buildGUI(){  getAccessibleContext().setAccessibleDescription(    "Calendar not accessible yet. Sorry!");  setBorder(BorderFactory.createEtchedBorder());  setLayout(new BorderLayout());  JPanel tp = new JPanel();  tp.add(monthChoice = new JComboBox());  for (int i = 0; i < months.length; i++)   monthChoice.addItem(months[i]);  monthChoice.setSelectedItem(months[mm]);  monthChoice.addActionListener(new ActionListener(){   public void actionPerformed(ActionEvent ae){    int i = monthChoice.getSelectedIndex();    if (i >= 0){     mm = i;     // System.out.println("Month=" + mm);     recompute();    }   }  });  monthChoice.getAccessibleContext().setAccessibleName("Months");  monthChoice.getAccessibleContext().setAccessibleDescription(    "Choose a month of the year");  tp.add(yearChoice = new JComboBox());  yearChoice.setEditable(true);  for (int i = yy - 5; i < yy + 5; i++)   yearChoice.addItem(Integer.toString(i));  yearChoice.setSelectedItem(Integer.toString(yy));  yearChoice.addActionListener(new ActionListener(){   public void actionPerformed(ActionEvent ae){    int i = yearChoice.getSelectedIndex();    if (i >= 0){     yy = Integer.parseInt(yearChoice.getSelectedItem()       .toString());     // System.out.println("Year=" + yy);     recompute();    }   }  });  add(BorderLayout.CENTER, tp);  JPanel bp = new JPanel();  bp.setLayout(new GridLayout(7, 7));  labs = new JButton[6][7]; // first row is days  bp.add(b0 = new JButton("S"));  bp.add(new JButton("M"));  bp.add(new JButton("T"));  bp.add(new JButton("W"));  bp.add(new JButton("R"));  bp.add(new JButton("F"));  bp.add(new JButton("S"));  ActionListener dateSetter = new ActionListener(){   public void actionPerformed(ActionEvent e){    String num = e.getActionCommand();    if (!num.equals("")){     // set the current day highlighted     setDayActive(Integer.parseInt(num));     // When this becomes a Bean, you can     // fire some kind of DateChanged event here.     // Also, build a similar daySetter for day-of-week btns.    }   }  };  // Construct all the buttons, and add them.  for (int i = 0; i < 6; i++)   for (int j = 0; j < 7; j++){    bp.add(labs[i][j] = new JButton(""));    labs[i][j].addActionListener(dateSetter);   }  add(BorderLayout.SOUTH, bp); } public final static int dom[] ={ 31, 28, 31, 30, /**//* jan feb mar apr */ 31, 30, 31, 31, /**//* may jun jul aug */ 30, 31, 30, 31 /**//* sep oct nov dec */ }; /** *//** Compute which days to put where, in the Cal panel */ protected void recompute(){  // System.out.println("Cal::recompute: " + yy + ":" + mm + ":" + dd);  if (mm < 0 || mm > 11)   throw new IllegalArgumentException("Month " + mm     + " bad, must be 0-11");  clearDayActive();  calendar = new GregorianCalendar(yy, mm, dd);  // Compute how much to leave before the first.  // getDay() returns 0 for Sunday, which is just right.  leadGap = new GregorianCalendar(yy, mm, 1).get(Calendar.DAY_OF_WEEK) - 1;  // System.out.println("leadGap = " + leadGap);  int daysInMonth = dom[mm];  if (isLeap(calendar.get(Calendar.YEAR)) && mm > 1)   ++daysInMonth;  // Blank out the labels before 1st day of month  for (int i = 0; i < leadGap; i++){   labs[0][i].setText("");  }  // Fill in numbers for the day of month.  for (int i = 1; i <= daysInMonth; i++){   JButton b = labs[(leadGap + i - 1) / 7][(leadGap + i - 1) % 7];   b.setText(Integer.toString(i));  }  // 7 days/week * up to 6 rows  for (int i = leadGap + 1 + daysInMonth; i < 6 * 7; i++){   labs[(i) / 7][(i) % 7].setText("");  }  // Shade current day, only if current month  if (thisYear == yy && mm == thisMonth)   setDayActive(dd); // shade the box for today  // Say we need to be drawn on the screen  repaint(); } /** *//**  * isLeap() returns true if the given year is a Leap Year.  *   * "a year is a leap year if it is divisible by 4 but not by 100, except  * that years divisible by 400 *are* leap years." -- Kernighan & Ritchie,  * _The C Programming Language_, p 37.  */ public boolean isLeap(int year){  if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)   return true;  return false; } /** *//** Set the year, month, and day */ public void setDate(int yy, int mm, int dd){  // System.out.println("Cal::setDate");  this.yy = yy;  this.mm = mm; // starts at 0, like Date  this.dd = dd;  recompute(); } /** *//** Unset any previously highlighted day */ private void clearDayActive(){  JButton b;  // First un-shade the previously-selected square, if any  if (activeDay > 0){   b = labs[(leadGap + activeDay - 1) / 7][(leadGap + activeDay - 1) % 7];   b.setBackground(b0.getBackground());   b.repaint();   activeDay = -1;  } } private int activeDay = -1; /** *//** Set just the day, on the current month */ public void setDayActive(int newDay){  clearDayActive();  // Set the new one  if (newDay <= 0)   dd = new GregorianCalendar().get(Calendar.DAY_OF_MONTH);  else   dd = newDay;  // Now shade the correct square  Component square = labs[(leadGap + newDay - 1) / 7][(leadGap + newDay - 1) % 7];  square.setBackground(Color.red);  square.repaint();  activeDay = newDay; } /** *//** For testing, a main program */ public static void main(String[] av){  JFrame f = new JFrame("Cal");  Container c = f.getContentPane();  c.setLayout(new FlowLayout());  // for this test driver, hardcode 1995/02/10.  c.add(new Cal(1995, 2 - 1, 10));  // and beside it, the current month.  c.add(new Cal());  f.pack();  f.setVisible(true); }}