stringutil常用工具类

package com.activity.util;

import java.io.File;
import java.math.BigDecimal;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;

public class StringUtil {
    /**
     * 去除字符串中的空格
     * @param str
     * @return
     * comment by ddb
     */
	public static String trim(String str) {
		return isNullOrBlank(str) ? str : str.trim();
	}
	/**
	 * 如果string为null则返回conv，否则返回string本身
	 * @param string
	 * @param conv
	 * @return
	 * comment by ddb
	 */
	public static String convNull2What(String string, String conv)
    {
        if (string == null)
        {
            return conv;
        }
        return string;
    }
	/**
	 * 如果第一个参数为null，则返回第二个参数，否则返回第一个参数的toString();
	 * @param obj
	 * @param conv
	 * @return
	 * comment by ddb
	 */
	public static String convNull2String(Object obj, String conv)
	    {
	        if (obj == null)
	        {
	            return conv;
	        }
	        return obj.toString();
	    }
	/**
	 * value为原值，key为value字符串中需要替换的部分，replaceValue是替换key的新字符串
	 * 例如： 
	 *   String str = "books";
     *   String rStr=StringUtil.replace(str , "oo", "ee");
     *   System.out.println(rStr);
     *   输出结果为：beeks
	 * @param value
	 * @param key
	 * @param replaceValue
	 * @return
	 * comment by ddb
	 */
	public static String replace(String value, String key, String replaceValue) {
		if (value != null && key != null && replaceValue != null) {
			int pos = value.indexOf(key);

			if (pos >= 0) {
				int length = value.length();
				int start = pos;
				int end = pos + key.length();

				if (length == key.length()) {
					value = replaceValue;
				} else if (end == length) {
					value = value.substring(0, start) + replaceValue;
				} else {
					value = value.substring(0, start) + replaceValue
							+ replace(value.substring(end), key, replaceValue);
				}
			}
		}
		return value;
	}
	/**
	 * 把字符串转换成能适应html编码的形式
	 * @param Str
	 * @return
	 * comment by ddb
	 */
	public static String HtmlStringFilter(String Str) {

		Str = replace(Str, "\n", "");
		Str = replace(Str, "\"", """);
		Str = replace(Str, "\r", "");
		Str = replace(Str, "<", "<");
		Str = replace(Str, ">", ">");
		;
		Str = replace(Str, " ", " ");
		Str = replace(Str, "&amp;nbsp;", " ");
		return Str;
	}
	/**
	 * 如果value字符串为"",则返回true，否则返回false
	 * @param value
	 * @return
	 * comment by ddb
	 */
	public static boolean isBlank(String value) {
		boolean ret = false;
		if (value != null && value.equals("")) {
			ret = true;
		}
		return ret;
	}
	/**
	 * 如果value字符串为null，则返回true，否则返回false
	 * @param value
	 * @return
	 * comment by ddb
	 */
	public static boolean isNull(String value) {
		return value == null ? true : false;
	}
	/**
	 * 如果字符串value为null或者为""则返回true，否则返回false
	 * @param value
	 * @return
	 * comment by ddb
	 */
	public static boolean isNullOrBlank(String value) {
		return isNull(value) || isBlank(value);
	}
	/**
	 * 如果参数fieldValue为""或者为null则返回null字符串，否则返回'fieldValue'形式的字符串
	 * @param fieldValue
	 * @return
	 * comment by ddb
	 */
	public static String fieldValue(String fieldValue) {
		if (StringUtil.isNullOrBlank(fieldValue)) {
			return "null";
		} else {
			return ("'" + fieldValue + "'");
		}

	}

	public static double fieldValue(double fieldValue) {

		return fieldValue;

	}

	public static float fieldValue(float fieldValue) {

		return fieldValue;

	}

	public static int fieldValue(int fieldValue) {

		return fieldValue;

	}

	public static long fieldValue(long fieldValue) {

		return fieldValue;

	}
	/**
	 * 把string类型的数组转换成stringBuffer形式的字符串
	 * 例如：string数组{aa,bb,cc}
	 *  转换后为[aa,bb,cc,]
	 * @param arr
	 * @return
	 * comment by ddb
	 */
	public static String getArrayElementString(String[] arr) {
		StringBuffer ret = new StringBuffer("");
		if (arr == null) {
			return null;
		}

		ret.append("[");
		for (int i = 0; i < arr.length; i++) {
			ret.append(arr[i] + ",");
		}
		ret.append("]");

		return ret.toString();

	}
	/**
	 * 传入一个日期格式，返回改格式的当前日期
	 * @param dateFormat
	 * @return
	 * comment by ddb
	 */
	public static String getCurrDate(String dateFormat) {
		Date date = new Date();
		SimpleDateFormat myDateFormat = new SimpleDateFormat(dateFormat);
		return myDateFormat.format(date);
	}
	/**
	 * 返回当前时间的Date类型
	 * 例如：Tue Feb 15 11:07:54 CST 2011
	 * @return
	 * comment by ddb
	 */
	public static java.util.Date getCurrentDate() {
		return new Date();
	}
	/**
	 *  返回当前系统时间
	 *  例如：2011-02-15 11:04:35.39
	 * @return
	 * comment by ddb
	 */
	public static Timestamp getCurrDateTime() {
		return new Timestamp(System.currentTimeMillis());
	}
	/**
	 * 返回当前时间的Date类型
	 * 例如 2011-02-15
	 * @return
	 * comment by ddb
	 */
	public static java.sql.Date getCurrDate() {
		return new java.sql.Date(System.currentTimeMillis());
	}
	/**
	 * 获得当前的年份
	 * 例如：2011
	 * @return
	 * comment by ddb
	 */
	public static String getCurrYear() {
		return getCurrDate("yyyy");
	}
	/**
	 * 把Date类型转换长String类型
	 * @param date
	 * @return
	 * comment by ddb
	 */
	public static String dateToString(java.util.Date date) {
		SimpleDateFormat myDateFormat = new SimpleDateFormat("yyyy-MM-dd");
		return myDateFormat.format(date);
	}
	/**
	 * 把string类型转换成Date类型
	 * @param strDate
	 * @return
	 * comment by ddb
	 */
	public static java.sql.Date stringToDate(String strDate) {

		java.sql.Date date = null;
		try {
			date = java.sql.Date.valueOf(strDate);
		} catch (Exception ex) {
		}
		return date;
	}

	/**
	 * 把String类型转换为yyyy-MM-dd形式的Date类型
	 * @param strDate
	 * @return
	 * comment by ddb
	 */
	public static java.util.Date stringToUtilDate(String strDate) {
		java.util.Date date = null;
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
		try {
			date = df.parse(strDate);
		} catch (Exception ex) {
		}
		return date;
	}
	/**
	 * 把固定格式的日期增加或者减少固定个月
	 * @param offset 月份偏移量，可以为负整数值
	 * @param dateFormat 日期格式
	 * @return
	 * comment by ddb
	 */
	public static String addMonth(int offset, String dateFormat) {
		SimpleDateFormat df = new SimpleDateFormat(dateFormat);
		Calendar calendar = Calendar.getInstance();
		calendar.add(Calendar.MONTH, offset);
		return df.format(calendar.getTime());
	}
	/**
	 * 把改date日期增加或者减少固定个月
	 * @param offset 月份偏移量，可以为负整数值
	 * @param date 日期类型
	 * @return
	 * comment by ddb
	 */
	public static Date addMonth(int offset, Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.add(Calendar.MONTH, offset);
		return calendar.getTime();
	}
	/**
	 * 把改date日期增加或者减少固定个天数
	 * @param offset 天数偏移量，可以为负整数值
	 * @param date 日期类型
	 * @return
	 * comment by ddb
	 */
	public static Date addDay(int offset, Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.add(Calendar.DATE, offset);
		return calendar.getTime();
	}
	/**
	 * 从开始时间到结束时间所跨越的周数
	 * @param startDate
	 * @param endDate
	 * @return
	 * comment by ddb
	 */
	public static int minusWeek(Date startDate, Date endDate) {

		if (startDate.getTime() >= endDate.getTime()) {
			return 0;
		}

		long startDay = (startDate.getTime() + 4 * DateUtils.DAY)
				/ DateUtils.WEEK;
		long endDay = (endDate.getTime() + 4 * DateUtils.DAY) / DateUtils.WEEK;

		long result = endDay - startDay + 1;

		return new Long(result).intValue();

	}
	/**
	 * 获取当前时间是一周中的某一天，返回值为如下字符串中的一个
	 * "sunday", "monday", "tuestay", "wednesday", "thursday", "friday","saturday" 
	 * @return
	 * comment by ddb
	 */
	public static String getWeekDay() {
		Date date = new Date();
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		int i = c.get(Calendar.DAY_OF_WEEK) - 1;
		String day[] = new String[] { "sunday", "monday", "tuestay", "wednesday", "thursday", "friday",
				"saturday" };
		return day[i];
	}
	
	public static double round(double v, int scale) {

		if (scale < 0) {
			throw new IllegalArgumentException(
					"The scale must be a positive integer or zero");
		}

		BigDecimal b = new BigDecimal(Double.toString(v));
		BigDecimal one = new BigDecimal("1");
		return b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
	}
	
	public static float floatRound(float a) {
		java.text.DecimalFormat df1 = new java.text.DecimalFormat("######.##");
		return Float.parseFloat(df1.format(a));
	}

	public static double floatRound(double a) {
		java.text.DecimalFormat df1 = new java.text.DecimalFormat("######.##");
		return Double.parseDouble(df1.format(a));
	}

	public static float floatRound1(float a) {
		java.text.DecimalFormat df1 = new java.text.DecimalFormat("######.#");
		return Float.parseFloat(df1.format(a));
	}

	public static String formatFour(int a) {
		java.text.DecimalFormat df1 = new java.text.DecimalFormat("0000");
		return df1.format(a);
	}

	public static String formatNumber(int a, int num) {
		if (num <= 0)
			return null;
		StringBuffer strbuff = new StringBuffer();
		for (int i = 0; i < num; i++) {
			strbuff.append("0");
		}
		java.text.DecimalFormat df1 = new java.text.DecimalFormat(strbuff
				.toString());
		return df1.format(a);
	}

	public static String getNewFileName(String oldFileName) {
		String name = oldFileName.substring(oldFileName.lastIndexOf("/") + 1);
		String extname = name.substring(name.lastIndexOf("."));
		Date now = new Date();
		long i = now.getTime();
		Random r = new Random();
		int rInt = r.nextInt(100);
		String newName = getCurrDate("yyyyMMdd") + new Long(i).toString()
				+ new Integer(rInt).toString() + extname;
		return newName;
	}

	public static String getOldFileName(String oldFileName) {
		String name = oldFileName.substring(oldFileName.lastIndexOf("/") + 1);
		return name;
	}

	public static String[] getFileNameArray(String theFileName) {
		String[] StrArr = {
				theFileName.substring(0, theFileName.indexOf(".") - 1),
				theFileName.substring(theFileName.indexOf(".") + 1) };
		return StrArr;
	}

	public static String getFormatString(String targetStr, String appendStr) {
		if (targetStr == null || targetStr.length() < 1) {
			targetStr = appendStr;
		} else {
			targetStr += "/" + appendStr;
		}
		return targetStr;
	}

	public static void delFolder(String s, boolean delDir) {

		File file1 = new File(s.replaceAll("//", "/").replaceAll("\\/", "/"));
		if (file1.exists() && file1.isDirectory()) {
			File afile[] = file1.listFiles();
			for (int i = 0; i < afile.length; i++) {
				if (afile[i].isFile()) {
					if (afile[i].exists())
						afile[i].delete();
					continue;
				}
				if (afile[i].isDirectory())
					delFolder(afile[i].toString(), delDir);
			}

			if (delDir)
				file1.delete();
		}

	}

	public static final void delFile(String s) {
		File file1 = new File(s);
		if (file1.exists()) {
			file1.delete();
		}

	}
	
	/**
	 * 屏蔽手机号码
	 * @param mobile
	 * @return
	 */
	public static String repMobile(String mobile) {
		String repMobile = "";
		if (null != mobile && !"".equals(mobile)) {
			if (11 == mobile.length()) {
				String h = mobile.substring(0, 3);
				String f = mobile.substring(7, 11);
				repMobile = h + "****" + f;
			} else {
				repMobile = mobile;
			}
		}
		return repMobile;
	}
	
//	public static void main(String[] args)
//    {
////	    String[] str = {"aa","bb","cc"};
////        Date rStrStart=StringUtil.getCurrentDate();
////        Date rStrEnd=StringUtil.addMonth(1,StringUtil.getCurrDate());
//        Float nub=StringUtil.floatRound1(444777);
//        System.out.println(nub);
//    }
}