java 基础类库之 FormatFun

package com.exjor.webdemo;

import java.text.SimpleDateFormat;
import java.util.Date;

public class FormatFun {
    /**
     * FORMAT_STRING = yyyy-MM-dd hh:mm:ss.SSS
     */
    public static final String STRING_FORMAT_DATETIME = "yyyy-MM-dd hh:mm:ss.SSS";

    /**
     * FORMAT_STRING = yyyy-MM-dd
     */
    public static final String STRING_FORMAT_ONLYDATE = "yyyy-MM-dd";

    /**
     * FORMAT_STRING = hh:mm:ss
     */
    public static final String STRING_FORMAT_ONLYTIME = "hh:mm:ss";

    /**
     * FORMAT_STRING = yyyy-MM-dd hh:mm:ss.SSS
     */
    public static final SimpleDateFormat SDF_FORMAT_DATETIME = new SimpleDateFormat(FormatFun.STRING_FORMAT_DATETIME);

    /**
     * FORMAT_STRING = yyyy-MM-dd
     */
    public static final SimpleDateFormat SDF_FORMAT_ONLYDATE = new SimpleDateFormat(FormatFun.STRING_FORMAT_ONLYDATE);

    /**
     * FORMAT_STRING = hh:mm:ss
     */
    public static final SimpleDateFormat SDF_FORMAT_ONLYTIME = new SimpleDateFormat(FormatFun.STRING_FORMAT_ONLYTIME);

    /**
     * FORMAT_STRING = yyyy-MM-dd hh:mm:ss.SSS
     */
    public static final int FORMAT_DATETIME = 0;

    /**
     * FORMAT_STRING = yyyy-MM-dd
     */
    public static final int FORMAT_ONLYDATE = 1;

    /**
     * FORMAT_STRING = hh:mm:ss
     */
    public static final int FORMAT_ONLYTIME = 2;

    /**
     * 格式化日期对象
     * @param pDate        java.util.Date类型的对象，为null则返回""
     * @param pFormatType    默认0=FORMAT_DATETIME; 1=FORMAT_ONLYDATE; 2=FORMAT_ONLYTIME
     * @return
     */
    public static String format(Date pDate, int pFormatType) {

        String vString = "";

        if (pDate != null) {
            switch (pFormatType) {
            case FORMAT_DATETIME:
                vString = SDF_FORMAT_DATETIME.format(pDate);
                break;
            case FORMAT_ONLYDATE:
                vString = SDF_FORMAT_ONLYDATE.format(pDate);
                break;

            case FORMAT_ONLYTIME:
                vString = SDF_FORMAT_ONLYTIME.format(pDate);
                break;
            default:
                vString = SDF_FORMAT_DATETIME.format(pDate);
                break;
            }

        }

        return vString;
    }

    /**
     * 格式化日期对象为DateTime格式
     * @param pDate java.util.Date类型的对象，为null则返回""
     * @return
     */
    public static String format(Date pDate) {

        return format(pDate, FORMAT_DATETIME);
    }

}