testhssfdateutil.java

java 读写word excel ppt

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.hssf.usermodel;

import junit.framework.TestCase;

import java.util.Date;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;

/**
 * Class TestHSSFDateUtil
 *
 *
 * @author
 * @author  Dan Sherman (dsherman at isisph.com)
 * @author  Hack Kampbjorn (hak at 2mba.dk)
 * @version %I%, %G%
 */

public class TestHSSFDateUtil
        extends TestCase
{
    public TestHSSFDateUtil(String s)
    {
        super(s);
    }

    /**
     * Checks the date conversion functions in the HSSFDateUtil class.
     */

    public void testDateConversion()
            throws Exception
    {

        // Iteratating over the hours exposes any rounding issues.
        for (int hour = 0; hour < 23; hour++)
        {
            GregorianCalendar date      = new GregorianCalendar(2002, 0, 1,
                    hour, 1, 1);
            double            excelDate =
                    HSSFDateUtil.getExcelDate(date.getTime());

            assertEquals("Checking hour = " + hour, date.getTime().getTime(),
                    HSSFDateUtil.getJavaDate(excelDate).getTime());
        }

        // check 1900 and 1904 date windowing conversions
        double excelDate = 36526.0;
        // with 1900 windowing, excelDate is Jan. 1, 2000
        // with 1904 windowing, excelDate is Jan. 2, 2004
        GregorianCalendar cal = new GregorianCalendar(2000,0,1); // Jan. 1, 2000
        Date dateIf1900 = cal.getTime();
        cal.add(GregorianCalendar.YEAR,4); // now Jan. 1, 2004
        cal.add(GregorianCalendar.DATE,1); // now Jan. 2, 2004
        Date dateIf1904 = cal.getTime();
        // 1900 windowing
        assertEquals("Checking 1900 Date Windowing",
                dateIf1900.getTime(),
                HSSFDateUtil.getJavaDate(excelDate,false).getTime());
        // 1904 windowing
        assertEquals("Checking 1904 Date Windowing",
                dateIf1904.getTime(),
                HSSFDateUtil.getJavaDate(excelDate,true).getTime());
    }

    /**
     * Checks the conversion of a java.util.date to Excel on a day when
     * Daylight Saving Time starts.
     */
    public void testExcelConversionOnDSTStart() {
        TimeZone cet = TimeZone.getTimeZone("Europe/Copenhagen");
        TimeZone.setDefault(cet);
        Calendar cal = new GregorianCalendar(2004, Calendar.MARCH, 28);
        for (int hour = 0; hour < 24; hour++) {

            // Skip 02:00 CET as that is the Daylight change time
            // and Java converts it automatically to 03:00 CEST
            if (hour == 2) {
                continue;
            }

            cal.set(Calendar.HOUR_OF_DAY, hour);
            Date javaDate = cal.getTime();
            double excelDate = HSSFDateUtil.getExcelDate(javaDate);
            double difference = excelDate - Math.floor(excelDate);
            int differenceInHours = (int) (difference * 24 * 60 + 0.5) / 60;
            assertEquals("Checking " + hour + " hour on Daylight Saving Time start date",
                    hour,
                    differenceInHours);
            assertEquals("Checking " + hour + " hour on Daylight Saving Time start date",
                    javaDate.getTime(),
                    HSSFDateUtil.getJavaDate(excelDate).getTime());
        }
    }

    /**
     * Checks the conversion of an Excel date to a java.util.date on a day when
     * Daylight Saving Time starts.
     */
    public void testJavaConversionOnDSTStart() {
        TimeZone cet = TimeZone.getTimeZone("Europe/Copenhagen");
        TimeZone.setDefault(cet);
        Calendar cal = new GregorianCalendar(2004, Calendar.MARCH, 28);
        double excelDate = HSSFDateUtil.getExcelDate(cal.getTime());
        double oneHour = 1.0 / 24;
        double oneMinute = oneHour / 60;
        for (int hour = 0; hour < 24; hour++, excelDate += oneHour) {

            // Skip 02:00 CET as that is the Daylight change time
            // and Java converts it automatically to 03:00 CEST            
            if (hour == 2) {
                continue;
            }

            cal.set(Calendar.HOUR_OF_DAY, hour);
            Date javaDate = HSSFDateUtil.getJavaDate(excelDate);
            assertEquals("Checking " + hour + " hours on Daylight Saving Time start date",
                    excelDate,
                    HSSFDateUtil.getExcelDate(javaDate), oneMinute);
        }
    }

    /**
     * Checks the conversion of a java.util.Date to Excel on a day when
     * Daylight Saving Time ends.
     */
    public void testExcelConversionOnDSTEnd() {
        TimeZone cet = TimeZone.getTimeZone("Europe/Copenhagen");
        TimeZone.setDefault(cet);
        Calendar cal = new GregorianCalendar(2004, Calendar.OCTOBER, 31);
        for (int hour = 0; hour < 24; hour++) {
            cal.set(Calendar.HOUR_OF_DAY, hour);
            Date javaDate = cal.getTime();
            double excelDate = HSSFDateUtil.getExcelDate(javaDate);
            double difference = excelDate - Math.floor(excelDate);
            int differenceInHours = (int) (difference * 24 * 60 + 0.5) / 60;
            assertEquals("Checking " + hour + " hour on Daylight Saving Time end date",
                    hour,
                    differenceInHours);
            assertEquals("Checking " + hour + " hour on Daylight Saving Time start date",
                    javaDate.getTime(),
                    HSSFDateUtil.getJavaDate(excelDate).getTime());
        }
    }

    /**
     * Checks the conversion of an Excel date to java.util.Date on a day when
     * Daylight Saving Time ends.
     */
    public void testJavaConversionOnDSTEnd() {
        TimeZone cet = TimeZone.getTimeZone("Europe/Copenhagen");
        TimeZone.setDefault(cet);
        Calendar cal = new GregorianCalendar(2004, Calendar.OCTOBER, 31);
        double excelDate = HSSFDateUtil.getExcelDate(cal.getTime());
        double oneHour = 1.0 / 24;
        double oneMinute = oneHour / 60;
        for (int hour = 0; hour < 24; hour++, excelDate += oneHour) {
            cal.set(Calendar.HOUR_OF_DAY, hour);
            Date javaDate = HSSFDateUtil.getJavaDate(excelDate);
            assertEquals("Checking " + hour + " hours on Daylight Saving Time start date",
                    excelDate,
                    HSSFDateUtil.getExcelDate(javaDate), oneMinute);
        }
    }
    
    /**
     * Tests that we correctly detect date formats as such
     */
    public void testIdentifyDateFormats() {
    	// First up, try with a few built in date formats
    	short[] builtins = new short[] { 0x0e, 0x0f, 0x10, 0x16, 0x2d, 0x2e };
    	for(int i=0; i<builtins.length; i++) {
    		String formatStr = HSSFDataFormat.getBuiltinFormat(builtins[i]);
    		assertTrue( HSSFDateUtil.isInternalDateFormat(builtins[i]) );
    		assertTrue( HSSFDateUtil.isADateFormat(builtins[i],formatStr) );
    	}
    	
    	// Now try a few built-in non date formats
    	builtins = new short[] { 0x01, 0x02, 0x17, 0x1f, 0x30 };
    	for(int i=0; i<builtins.length; i++) {
    		String formatStr = HSSFDataFormat.getBuiltinFormat(builtins[i]);
    		assertFalse( HSSFDateUtil.isInternalDateFormat(builtins[i]) );
    		assertFalse( HSSFDateUtil.isADateFormat(builtins[i],formatStr) );
    	}
    	
    	// Now for some non-internal ones
    	// These come after the real ones
    	int numBuiltins = HSSFDataFormat.getNumberOfBuiltinBuiltinFormats();
    	assertTrue(numBuiltins < 60);
    	short formatId = 60;
    	assertFalse( HSSFDateUtil.isInternalDateFormat(formatId) );
    	
    	// Valid ones first
    	String[] formats = new String[] {
    			"yyyy-mm-dd", "yyyy/mm/dd", "yy/mm/dd", "yy/mmm/dd",
    			"dd/mm/yy", "dd/mm/yyyy", "dd/mmm/yy",
    			"dd-mm-yy", "dd-mm-yyyy",
    			"dd\\-mm\\-yy", // Sometimes escaped
    	};
    	for(int i=0; i<formats.length; i++) {
    		assertTrue( HSSFDateUtil.isADateFormat(formatId, formats[i]) );
    	}
    	
    	// Then invalid ones
    	formats = new String[] {
    			"yyyy:mm:dd", 
    			"0.0", "0.000",
    			"0%", "0.0%",
    			"", null
    	};
    	for(int i=0; i<formats.length; i++) {
    		assertFalse( HSSFDateUtil.isADateFormat(formatId, formats[i]) );
    	}
    }

    public static void main(String [] args) {
        System.out
                .println("Testing org.apache.poi.hssf.usermodel.TestHSSFDateUtil");
        junit.textui.TestRunner.run(TestHSSFDateUtil.class);
    }

}