StringUtils.java

package org.kymjs.music.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;

/**
 * 字符串操作工具包
 */
public class StringUtils {
    private final static Pattern emailer = Pattern
            .compile("\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*");

    private final static ThreadLocal<SimpleDateFormat> dateFormater = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        }
    };

    private final static ThreadLocal<SimpleDateFormat> dateFormater2 = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd");
        }
    };
    private final static ThreadLocal<SimpleDateFormat> dateFormater3 = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("HH:mm:ss");
        }
    };

    /**
     * 毫秒值转换为mm:ss
     * @author kymjs
     * @param ms
     */
    public static String timeFormat(int ms) {
        StringBuilder time = new StringBuilder();
        time.delete(0, time.length());
        ms /= 1000;
        int s = ms % 60;
        int min = ms / 60;
        if (min < 10) {
            time.append(0);
        }
        time.append(min).append(":");
        if (s < 10) {
            time.append(0);
        }
        time.append(s);
        return time.toString();
    }

    /**
     * 将字符串转位日期类型
     * 
     * @return
     */
    public static Date toDate(String sdate) {
        try {
            return dateFormater.get().parse(sdate);
        } catch (ParseException e) {
            return null;
        }
    }

    /**
     * 判断给定字符串时间是否为今日
     * 
     * @param sdate
     * @return boolean
     */
    public static boolean isToday(String sdate) {
        boolean b = false;
        Date time = toDate(sdate);
        Date today = new Date();
        if (time != null) {
            String nowDate = dateFormater2.get().format(today);
            String timeDate = dateFormater2.get().format(time);
            if (nowDate.equals(timeDate)) {
                b = true;
            }
        }
        return b;
    }

    /**
     * 判断给定字符串是否空白串�? 空白串是指由空格、制表符、回车符、换行符组成的字符串 若输入字符串为null或空字符串，返回true
     * 
     * @param input
     * @return boolean
     */
    public static boolean isEmpty(String input) {
        if (input == null || "".equals(input))
            return true;

        for (int i = 0; i < input.length(); i++) {
            char c = input.charAt(i);
            if (c != ' ' && c != '\t' && c != '\r' && c != '\n') {
                return false;
            }
        }
        return true;
    }

    /**
     * 判断是不是一个合法的电子邮件地址
     * 
     * @param email
     * @return
     */
    public static boolean isEmail(String email) {
        if (email == null || email.trim().length() == 0)
            return false;
        return emailer.matcher(email).matches();
    }

    /**
     * 字符串转整数
     * 
     * @param str
     * @param defValue
     * @return
     */
    public static int toInt(String str, int defValue) {
        try {
            return Integer.parseInt(str);
        } catch (Exception e) {
        }
        return defValue;
    }

    /**
     * 对象转整�?
     * 
     * @param obj
     * @return 转换异常返回 0
     */
    public static int toInt(Object obj) {
        if (obj == null)
            return 0;
        return toInt(obj.toString(), 0);
    }

    /**
     * 对象转整�?
     * 
     * @param obj
     * @return 转换异常返回 0
     */
    public static long toLong(String obj) {
        try {
            return Long.parseLong(obj);
        } catch (Exception e) {
        }
        return 0;
    }

    /**
     * 字符串转布尔�?
     * 
     * @param b
     * @return 转换异常返回 false
     */
    public static boolean toBool(String b) {
        try {
            return Boolean.parseBoolean(b);
        } catch (Exception e) {
        }
        return false;
    }
}