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Http格林尼治時(shí)間和毫秒的相互轉(zhuǎn)化EEE, dd MMM y HH:mm:ss 'GMT'

來源：程序員人生發(fā)布時(shí)間：2016-06-27 08:40:45 閱讀次數(shù)：4007次

Http格林尼治時(shí)間和毫秒的相互轉(zhuǎn)化EEE, dd MMM y HH:mm:ss ‘GMT’

歡迎大家關(guān)注Android開源網(wǎng)絡(luò)框架NoHttp：https://github.com/yanzhenjie/NoHttp
在線直播視頻和代碼下載：http://pan.baidu.com/s/1miEOtwG

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前言

　　寫這個(gè)博客是由于這段時(shí)間寫NoHttp時(shí)遇到格式話Http響應(yīng)頭和要求頭中和Data有關(guān)的字段時(shí)遇到的1些問題，最后總結(jié)了1下算法。
　　2個(gè)概念明確下：
　　1. 格林尼治時(shí)間（有的出版局叫格林威治Greenwhich）的格式：”EEE, dd MMM y HH:mm:ss ‘GMT’”
　　2. 毫秒格式：1464709616971

格林尼治（EEE, dd MMM y HH:mm:ss ‘GMT’）轉(zhuǎn)化為毫秒

public static final String FORMAT_HTTP_DATA = "EEE, dd MMM y HH:mm:ss 'GMT'";

public static final TimeZone GMT_TIME_ZONE = TimeZone.getTimeZone("GMT");

/**
 * Parsing the TimeZone of time in milliseconds.
 *
 * @param gmtTime GRM Time, Format such as: {@value #FORMAT_HTTP_DATA}.
 * @return The number of milliseconds from 1970.1.1.
 * @throws ParseException if an error occurs during parsing.
 */
public static long parseGMTToMillis(String gmtTime) throws ParseException {
    SimpleDateFormat formatter = new SimpleDateFormat(FORMAT_HTTP_DATA, Locale.US);
    formatter.setTimeZone(GMT_TIME_ZONE);
    Date date = formatter.parse(gmtTime);
    return date.getTime();
}

毫秒轉(zhuǎn)化為格林尼治（EEE, dd MMM y HH:mm:ss ‘GMT’）

public static final String FORMAT_HTTP_DATA = "EEE, dd MMM y HH:mm:ss 'GMT'";

public static final TimeZone GMT_TIME_ZONE = TimeZone.getTimeZone("GMT");

/**
 * Parsing the TimeZone of time from milliseconds.
 *
 * @param milliseconds the number of milliseconds from 1970.1.1.
 * @return GRM Time, Format such as: {@value #FORMAT_HTTP_DATA}.
 */
public static String formatMillisToGMT(long milliseconds) {
    Date date = new Date(milliseconds);
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(FORMAT_HTTP_DATA, Locale.US);
    simpleDateFormat.setTimeZone(GMT_TIME_ZONE);
    return simpleDateFormat.format(date);
}

合起來寫成1個(gè)類HttpDate

public final class HttpDateTime {

    public static final String FORMAT_HTTP_DATA = "EEE, dd MMM y HH:mm:ss 'GMT'";

    public static final TimeZone GMT_TIME_ZONE = TimeZone.getTimeZone("GMT");

    /**
     * Parsing the TimeZone of time in milliseconds.
     *
     * @param gmtTime GRM Time, Format such as: {@value #FORMAT_HTTP_DATA}.
     * @return The number of milliseconds from 1970.1.1.
     * @throws ParseException if an error occurs during parsing.
     */
    public static long parseGMTToMillis(String gmtTime) throws ParseException {
        SimpleDateFormat formatter = new SimpleDateFormat(FORMAT_HTTP_DATA, Locale.US);
        formatter.setTimeZone(GMT_TIME_ZONE);
        Date date = formatter.parse(gmtTime);
        return date.getTime();
    }

    /**
     * Parsing the TimeZone of time from milliseconds.
     *
     * @param milliseconds the number of milliseconds from 1970.1.1.
     * @return GRM Time, Format such as: {@value #FORMAT_HTTP_DATA}.
     */
    public static String formatMillisToGMT(long milliseconds) {
        Date date = new Date(milliseconds);
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(FORMAT_HTTP_DATA, Locale.US);
        simpleDateFormat.setTimeZone(GMT_TIME_ZONE);
        return simpleDateFormat.format(date);
    }

    /**
     * Returned the local number of milliseconds after 100.
     *
     * @return Long format time.
     */
    public static long getMaxExpiryMillis() {
        return System.currentTimeMillis() + 1000L * 60L * 60L * 24L * 365L * 100L;
    }

}