package com.demo.app.common;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.regex.Pattern;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;/** * 字符串操作工具包 *  * @author liux () * @version 1.0 * @created 2012-3-21 */public class StringUtils {    private final static Pattern emailer = Pattern            .compile("\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*");    // private final static SimpleDateFormat dateFormater = new    // SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    // private final static SimpleDateFormat dateFormater2 = new    // SimpleDateFormat("yyyy-MM-dd");    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");        }    };    /**     * 字符串转JSON     *      * @param json     * @return     * @throws JSONException     */    public static JSONObject toJSONObject(String json) throws JSONException {        if (!isEmpty(json)) {            if (json.indexOf("[") == 0) {                json = json.substring(1, json.length());            }            if (json.lastIndexOf("]") == json.length()) {                json = json.substring(0, json.length() - 1);            }            return new JSONObject(json);        }        return null;    }    /**     * 字符串转JSON     *      * @param json     * @return     * @throws JSONException     */    public static JSONArray toJSONArray(String json) throws JSONException {        if (!isEmpty(json)) {            // if (json.indexOf("[") == 0) {            // json = json.substring(1, json.length());            // }            // if (json.lastIndexOf("]") == json.length()) {            // json = json.substring(0, json.length() - 1);            // }        }        return new JSONArray(json);    }    /**     * 将字符串转位日期类型     *      * @param sdate     * @return     */    public static Date toDate(String sdate) {        try {            return dateFormater.get().parse(sdate);        } catch (ParseException e) {            return null;        }    }    /**     * 时间戳转换     *      * @param timestampString     * @return     */    public static String TimeStamp2Date(String timestampString) {        Long timestamp = Long.parseLong(timestampString) * 1000;        return dateFormater.get().format(new java.util.Date(timestamp));    }    /**     * 以友好的方式显示距离     *      * @param sdate     * @return     */    public static String friendly_Distance(double distance) {        String dis = "";        if (distance >= 1000) {            if (distance / 1000 >= 1000) {                dis = ">1000km";            } else if (distance / 1000 >= 100) {                dis = ">100km";            } else {                dis = String.format("%.1f", (distance / 1000)) + "km";            }        } else {            dis = distance + "m";        }//        Log.v("以友好的方式显示距离", distance + "   " + dis);        return dis;    }    /**     * 以友好的方式显示时间     *      * @param sdate     * @return     */    public static String friendly_time(String sdate) {        Date time = toDate(sdate);        if (time == null) {            return "Unknown";        }        String ftime = "";        Calendar cal = Calendar.getInstance();        // 判断是否是同一天        String curDate = dateFormater2.get().format(cal.getTime());        String paramDate = dateFormater2.get().format(time);        if (curDate.equals(paramDate)) {            int hour = (int) ((cal.getTimeInMillis() - time.getTime()) / 3600000);            if (hour == 0)                ftime = Math.max(                        (cal.getTimeInMillis() - time.getTime()) / 60000, 1)                        + "分钟前";            else                ftime = hour + "小时前";            return ftime;        }        long lt = time.getTime() / 86400000;        long ct = cal.getTimeInMillis() / 86400000;        int days = (int) (ct - lt);        if (days == 0) {            int hour = (int) ((cal.getTimeInMillis() - time.getTime()) / 3600000);            if (hour == 0)                ftime = Math.max(                        (cal.getTimeInMillis() - time.getTime()) / 60000, 1)                        + "分钟前";            else                ftime = hour + "小时前";        } else if (days == 1) {            ftime = "昨天";        } else if (days == 2) {            ftime = "前天";        } else if (days > 2 && days <= 10) {            ftime = days + "天前";        } else if (days > 10) {            ftime = dateFormater2.get().format(time);        }        return ftime;    }    /**     * 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;    }    /**     * 对象转整数     *      * @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);    }    /**     * 对象转整数     *      * @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;    }    /**     * 字符串转布尔值     *      * @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;    }}