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com.sun.image.codec.jpeg.JPEGImageEncoder在JDK API文档里吗?如何看的

热度:1187   发布时间:2013-02-25 00:00:00.0
com.sun.image.codec.jpeg.JPEGImageEncoder在JDK API文档里吗?怎么看的?
3Q

------解决方案--------------------------------------------------------
不能看到

com.sun.*, sun.* 开头的包都是 JRE 的底层类库,未被归档化,这是由于这些类都是依赖于平台的,在 Windows 平台上有这个类,在 Linux 上可能就没有这个类。

我们应该尽量少用 JRE 的底层类库:http://java.sun.com/products/jdk/faq/faq-sun-packages

通过反编译程序反编译了一下 JPEGImageEncoder 接口的源代码,仅供参考:

Java code
package com.sun.image.codec.jpeg;/** * JPEGImageEncoder Interface *  * JPEGImageEncoder compresses images into JPEG data streams and * writes the JPEG stream to an OutputStream  ParseException {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Date date = sdf.parse("2009-10-27 00:00:00");                TenDayScope tenDay = TenDayScope.getInstance();        System.out.println(tenDay.contains(date));    }}class TenDayScope {        public final static int FIRST_TEN_DAY  = 0;    public final static int SECOND_TEN_DAY = 1;    public final static int THIRD_TEN_DAY  = 2;            private Calendar start;    private Calendar end;        private TenDayScope() {        init();    }        public Calendar getStart() {        return (Calendar)start.clone();    }        public Calendar getEnd() {        return (Calendar)end.clone();    }        public static TenDayScope getInstance() {        return new TenDayScope();    }        /**     * 判断 Date 是否在本旬以及下旬之间     * @param date     * @return     * 2009-10-27 下午01:42:07     */    public boolean contains(Date date) {        if(date == null) {            return false;        }        return contains(date.getTime());    }        /**     * 判断 Calendar 是否在本旬以及下旬之间     * @param date     * @return     * 2009-10-27 下午01:42:07     */    public boolean contains(Calendar calendar) {        if(calendar == null) {            return false;        }        return contains(calendar.getTimeInMillis());    }        /**     * 判断 Unix 纪元毫秒数是否在本旬以及下旬之间     * @param date     * @return     * 2009-10-27 下午01:42:07     */    public boolean contains(long millis) {        return (millis >= start.getTimeInMillis()) && (millis < end.getTimeInMillis());    }        private void init() {        {            start = Calendar.getInstance();            int t = getTenDay(start.get(Calendar.DATE));            start.set(Calendar.DATE, getStartTenDay(t));            clearHms(start);        }                {            end = Calendar.getInstance();            int t = getTenDay(end.get(Calendar.DATE));            int endDay = getEndTenNextDay(t);            if(t > FIRST_TEN_DAY) {                end.add(Calendar.MONTH, 1);            }            end.set(Calendar.DATE, getEndTenNextDay(endDay));            clearHms(end);        }    }        /**     * 清空 Calendar 日以下的字段     * @param c     * 2009-10-27 下午01:41:39     */    private void clearHms(Calendar c) {        c.set(Calendar.HOUR_OF_DAY, 0);        c.set(Calendar.MINUTE, 0);        c.set(Calendar.SECOND, 0);        c.set(Calendar.MILLISECOND, 0);    }        /**     * 根据当前旬次,获得该旬的第一天日     *      * @param currentTenDay     * @return     * 2009-10-27 下午01:40:56     */    private int getStartTenDay(int currentTenDay) {        return currentTenDay * 10 + 1;    }        /**     * 根据当前旬次,获得下旬最后一天的后一天     * @param currentTenDay     * @return     * 2009-10-27 下午01:41:18     */    private int getEndTenNextDay(int currentTenDay) {        return (currentTenDay + 2) % 3 * 10 + 1;    }        /**     * 根据日期获得旬次     * @param day     * 2009-10-27 下午01:40:28     */    private int getTenDay(int day) {        int t = (day - 1) / 10;        if(t > THIRD_TEN_DAY) {            t = THIRD_TEN_DAY;        }        return t;    }        public String toString() {        return String.format("start: %tF %<tT, end: %tF %<tT", start, end);    }}
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