gdhb/core.src/com/hcks/cmfds/commons/util/StringUtils.java

package com.hcks.cmfds.commons.util;

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @Author 刘厦(liusha.information@gmail.com)
 * @Date 创建时间：May 16, 2011 12:25:13 PM
 * @Version 0.0.0 类说明: 字符串操作工具类
 */
public class StringUtils {

	public static final String SIMPLE_DATE_FORMAT = "yyyy-MM-dd";
	public static final String SIMPLE_DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
	public static final String[] TRUE_STRINGS = new String[] { "true", "yes", "on", "1", "y" };

	/**
	 * 
	 */
	public static final String REGEX_IMG_SRC = "src=\"(.*?)\"";

	/**
	 * 转换中文参数
	 * 
	 * @param str
	 * @return
	 */
	public static String convertEncoding(String str) {
		if (str == null)
			return str;
		try {
			return new String(str.getBytes("ISO-8859-1"), "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
			return str;
		}
	}

	/**
	 * 获取字符串中所有图片的文件名
	 * 
	 * @param memo
	 * @return
	 */
	public static List<String> getImg(String memo) {
		List<String> list = new ArrayList<String>();
		Pattern pa = Pattern.compile(REGEX_IMG_SRC, Pattern.DOTALL);
		Matcher matcher = pa.matcher(memo);
		while (matcher.find()) {
			list.add(matcher.group());
		}
		return list;
	}

	private StringUtils() {
	}

	/**
	 * 串接字符串（通过 StringBuilder）
	 * 
	 * @param strs
	 * @return
	 */
	public static String concat(String... strs) {
		if (strs == null)
			return null;
		StringBuilder buff = new StringBuilder();
		for (int i = 0; i < strs.length; i++) {
			buff.append(strs[i]);
		}
		return buff.toString();
	}

	/**
	 * 是否为空串
	 * 
	 * @param obj
	 * @return
	 */
	public static boolean empty(Object obj) {
		if (obj == null)
			return true;
		String str;
		if (obj instanceof String) {
			str = (String) obj;
		} else {
			str = obj.toString();
		}
		return str.length() == 0;
	}

	/**
	 * 是否不为空串
	 * 
	 * @param obj
	 * @return
	 */
	public static boolean notEmp(Object obj) {
		return !empty(obj);
	}

	/**
	 * 转化为int 失败的话返回默认值
	 * 
	 * @param str
	 * @param defaultValue
	 * @return
	 */
	public static int toInt(String str, int defaultValue) {
		try {
			return Integer.parseInt(str);
		} catch (NumberFormatException e) {
			return defaultValue;
		}
	}

	public static int toInt(String str) {
		return toInt(str, 0);
	}

	public static float toFloat(String str) {
		return toFloat(str, 0);
	}

	/**
	 * 转化为float 失败的话返回默认值
	 * 
	 * @param str
	 * @param defaultValue
	 * @return
	 */
	public static float toFloat(String str, float defaultValue) {
		try {
			return Float.parseFloat(str);
		} catch (NumberFormatException e) {
			return defaultValue;
		}
	}

	public static double toDouble(String str) {
		return toDouble(str, 0);
	}

	/**
	 * 转化为double 失败的话返回默认值
	 * 
	 * @param str
	 * @param defaultValue
	 * @return
	 */
	public static double toDouble(String str, double defaultValue) {
		try {
			return Double.parseDouble(str);
		} catch (NumberFormatException e) {
			return defaultValue;
		}
	}

	public static long toLong(String str) {
		return toLong(str, 0);
	}

	/**
	 * 转化为long 失败的话返回默认值
	 * 
	 * @param str
	 * @param defaultValue
	 * @return
	 */
	public static long toLong(String str, long defaultValue) {
		try {
			return Long.parseLong(str);
		} catch (NumberFormatException e) {
			return defaultValue;
		}
	}

	/**
	 * 判断字符串"true" 是否表示 true
	 * 
	 * @param str
	 * @return
	 */
	public static boolean isTrue(String str) {
		if (str == null || str.length() == 0)
			return false;
		for (int i = 0; i < TRUE_STRINGS.length; i++) {
			if (TRUE_STRINGS[i].equalsIgnoreCase(str)) {
				return true;
			}
		}
		return false;
	}

	public static boolean isFalse(String str) {
		return !isTrue(str);
	}

	/**
	 * Timestamp转换为日期字符串
	 * 
	 * @param ts
	 * @return
	 */
	public static String toDate(Timestamp ts) {
		if (ts == null)
			return "";
		SimpleDateFormat df = new SimpleDateFormat(SIMPLE_DATETIME_FORMAT);
		return df.format(ts);
	}

	public static Date formatTimestamp(Timestamp ts) {
		Date d1 = new Date(ts.getTime());
		String s1 = formatDate(d1, SIMPLE_DATETIME_FORMAT);
		return toDate(s1, SIMPLE_DATETIME_FORMAT);
	}

	/**
	 * 将字符串解析为Date类型
	 * 
	 * @param date
	 * @param pattern
	 * @return
	 */
	public static Date toDate(String date, String pattern) {
		SimpleDateFormat format = new SimpleDateFormat(pattern);
		try {
			return format.parse(date);
		} catch (ParseException e) {
			throw new RuntimeException(String.format("Failed to parse the String [%s] to Date.", date), e);
		}
	}

	public static Date toDate(String date) {
		return toDate(date, SIMPLE_DATETIME_FORMAT);
	}

	/**
	 * 格式化日期到字符串
	 * 
	 * @param date
	 * @param pattern
	 * @return
	 */
	public static String formatDate(Date date, String pattern) {
		if (date == null)
			return "";
		SimpleDateFormat format = new SimpleDateFormat(pattern);
		return format.format(date);
	}

	/**
	 * 使用默认格式格式化日期到字符串
	 * 
	 * @param date
	 * @return
	 */
	public static String formatDate(Date date) {
		SimpleDateFormat format = new SimpleDateFormat(SIMPLE_DATE_FORMAT);
		return format.format(date);
	}

	public static double round(double num, int digit) {
		
		Double d1 = new Double(num);
		if(d1.isNaN() || d1.isInfinite())
		{
			return 0.0;
		}
		return new BigDecimal(num).setScale(digit, RoundingMode.HALF_UP).doubleValue();
	}
	public static Double round(String num, int digit) {
			
		if(isNumeric(num))
		{
			Double d1 = new Double(num);
			if(d1.isNaN() || d1.isInfinite())
			{
				return 0.0;
			}
			return new BigDecimal(num).setScale(digit, RoundingMode.HALF_UP).doubleValue();
		}else
		{
			return null;
		}
		
	}
	public static int roundToInt(double num) {
		
		return new BigDecimal(num).setScale(0, RoundingMode.HALF_UP).intValue();
	}
	/**
	 * 
	 * @方法名称: getUUID
	 * @描述: 获得UUID
	 * @参数 @return
	 * @返回值 String
	 * @抛出异常
	 */
	public static String getUUID() {
		String s = UUID.randomUUID().toString();
		// 去掉“-”符号
		return s.substring(0, 8) + s.substring(9, 13) + s.substring(14, 18) + s.substring(19, 23) + s.substring(24);
	}

	public static String getFomatString(Double str)
	{
		if(StringUtils.notEmp(str))
		{
			java.text.DecimalFormat   df   =new   java.text.DecimalFormat("0.00");    
			return df.format(str);  
		}else
		{
			return null;
		}
		
	}
	/**
	 * 判断是否为数字字符串
	 * @param str
	 * @return
	 */
	public static boolean isNumeric(String str){ 
		   Pattern pattern = Pattern.compile("[0-9]*"); 
		   if(notEmp(str))
		   {
			   Matcher isNum = pattern.matcher(str);
			   if( !isNum.matches() ){
			       return false; 
			   } 
			   
		   }else
		   {
			   return false;
		   }
		 
		   return true; 
		}
}