stringutils.java

这是本人曾经在公司里用的,内部开发框架,基于struts+hibernate今天分享给大家

		return values;
	}

	/**
	 * Joins the elements of the provided array into a single string
	 * containing a list of CSV elements.
	 *
	 * @param list      The list of values to join together.
	 * @param separator The separator character.
	 * @return          The CSV text.
	 */
	public static String join(String[] list, String separator) {
		StringBuffer csv = new StringBuffer();
		for (int i = 0; i < list.length; i++) {
			if (i > 0) {
				csv.append(separator);
			}
			csv.append(list[i]);
		}
		return csv.toString();
	}

	/**
	 * Takes a block of text which might have long lines in it and wraps
	 * the long lines based on the supplied wrapColumn parameter. It was
	 * initially implemented for use by VelocityEmail. If there are tabs
	 * in inString, you are going to get results that are a bit strange,
	 * since tabs are a single character but are displayed as 4 or 8
	 * spaces. Remove the tabs.
	 *
	 * @param inString   Text which is in need of word-wrapping.
	 * @param newline    The characters that define a newline.
	 * @param wrapColumn The column to wrap the words at.
	 * @return           The text with all the long lines word-wrapped.
	 */

	public static String wrapText(String inString, String newline,
			int wrapColumn) {
		StringTokenizer lineTokenizer = new StringTokenizer(inString, newline,
				true);
		StringBuffer stringBuffer = new StringBuffer();

		while (lineTokenizer.hasMoreTokens()) {
			try {
				String nextLine = lineTokenizer.nextToken();

				if (nextLine.length() > wrapColumn) {
					// This line is long enough to be wrapped.
					nextLine = wrapLine(nextLine, newline, wrapColumn);
				}

				stringBuffer.append(nextLine);
			} catch (NoSuchElementException nsee) {
				// thrown by nextToken(), but I don't know why it would
				break;
			}
		}
		return (stringBuffer.toString());
	}

	/**
	 * Wraps a single line of text. Called by wrapText(). I can't
	 * think of any good reason for exposing this to the public,
	 * since wrapText should always be used AFAIK.
	 *
	 * @param line       A line which is in need of word-wrapping.
	 * @param newline    The characters that define a newline.
	 * @param wrapColumn The column to wrap the words at.
	 * @return           A line with newlines inserted.
	 */

	protected static String wrapLine(String line, String newline, int wrapColumn) {
		StringBuffer wrappedLine = new StringBuffer();

		while (line.length() > wrapColumn) {
			int spaceToWrapAt = line.lastIndexOf(' ', wrapColumn);

			if (spaceToWrapAt >= 0) {
				wrappedLine.append(line.substring(0, spaceToWrapAt));
				wrappedLine.append(newline);
				line = line.substring(spaceToWrapAt + 1);
			}

			// This must be a really long word or URL. Pass it
			// through unchanged even though it's longer than the
			// wrapColumn would allow. This behavior could be
			// dependent on a parameter for those situations when
			// someone wants long words broken at line length.
			else {
				spaceToWrapAt = line.indexOf(' ', wrapColumn);

				if (spaceToWrapAt >= 0) {
					wrappedLine.append(line.substring(0, spaceToWrapAt));
					wrappedLine.append(newline);
					line = line.substring(spaceToWrapAt + 1);
				} else {
					wrappedLine.append(line);
					line = "";
				}
			}
		}

		// Whatever is left in line is short enough to just pass through,
		// just like a small small kidney stone
		wrappedLine.append(line);

		return wrappedLine.toString();
	}

	/**
	 * convert the ISO char encoding to GBK
	 * @param str the ISO encoding string
	 * @return the GBK encoding string
	 * created by yanfeng at 13/5/2003
	 * modified by yanfeng at14/7/2003
	 * for recursive invoke of this function in log.error()
	 * @CheckItem@ SELFBUG-yanfeng-20030714 可能产生循环调用
	 */
	public static String ISOtoGBK(String str) {
		if (str == null) {
			return null;
		}
		byte[] by = null;
		try {
			by = str.getBytes("ISO8859_1");
		} catch (UnsupportedEncodingException ex) {
			return str;
		}
		try {
			String a = new String(by, "GBK");
			return a;
		} catch (UnsupportedEncodingException ex1) {
			return str;
		}
	}

	/**
	 * 根据系统环境自动判断是否转码
	 * @param str String
	 * @return String
	 */
	public static String GBKtoISOByEncode(String str) {
		if (str == null) {
			return null;
		}
		if (isISO) {//是
			byte[] by = null;
			try {
				by = str.getBytes("GBK");
			} catch (UnsupportedEncodingException ex) {
				return str;
			}
			try {
				String a = new String(by, "ISO8859_1");
				return a;
			} catch (UnsupportedEncodingException ex1) {
				return str;
			}

		} else {
			return str;
		}

	}

	public static String GBKtoISO(String str) {
		if (str == null) {
			return null;
		}
		byte[] by = null;
		try {
			by = str.getBytes("GBK");
		} catch (UnsupportedEncodingException ex) {
			return str;
		}
		try {
			String a = new String(by, "ISO8859_1");
			return a;
		} catch (UnsupportedEncodingException ex1) {
			return str;
		}
	}

	/**
	 * trim the string even when it's null
	 * @param str the string need to be trimmed
	 * @return the trimmed string
	 */
	public static String trim(String str) {
		if (str == null) {
			return "";
		}
		return str.trim();
	}

	/**
	 * 判断str是否在strArr中
	 * @param str
	 * @param strArr
	 * @return true:str在strArr中出现,;false otherwise.
	 */
	public static boolean stringInArray(String str, String[] strArr) {
		for (int i = 0; i < strArr.length; i++) {
			if (str.equals(strArr[i])) {
				return true;
			}
		}
		return false;
	}

	/**
	 * 将带有格式的字符串转换成HTML方式
	 * @param origine
	 * @return
	 */
	public static String convert2Html(String origine) {
		String outStr = null;
		if (origine != null) {
			String tmp = StringUtils.replace(origine, ">", "&gt;");
			String tmp2 = StringUtils.replace(tmp, "<", "&lt;");
			String tmp3 = StringUtils.replace(tmp2, " ", "&nbsp;");

			String tmp4 = StringUtils.replace(tmp3, "\r\n", "<br>");

			outStr = tmp4;
		} else {
			outStr = "";
		}
		return outStr;
	}

	public static void main(String[] args) {
		String a = "?";
		System.out.println(replace(a, "", "oo"));
	}

	/**
	 * 找出字符串在数组中的位置(序号)，若不存在，返回数组的长度
	 * @param myStr 字符串
	 * @param myList 字符串数组
	 * @return int
	 * @author Zhang Zhongguang
	 */
	public static int getStringsIndex(String myStr, String[] myList) {
		int i = 0;
		for (i = 0; i < myList.length; i++) {
			if (myList[i].equals(myStr)) {
				break;
			}
		}
		return i;
	}

	/**
	 * 将字符串src按format指定的格式转化为日期对象，本地中文
	 * @param src String
	 * @param format String 格式，如yy/MM/dd hh:mm:ss
	 * @return Date对象
	 * @throws ParseException
	 * @author Zhang Zhongguang
	 */
	public static Date toDate(String src, String format) throws ParseException {
		SimpleDateFormat sdf = new SimpleDateFormat(format,
				java.util.Locale.CHINESE);
		Date d = null;
		d = sdf.parse(src);
		return d;
	}

	/**
	 * 去src数组中为null的元素，返回新的数组
	 * @param src
	 * @return String[]
	 * @author Zhang zhongguang
	 */
	public static String[] trimNull(String[] src) {
		if (src == null) {
			return null;
		}

		String[] tmp = null;

		int count = 0;
		//取null元素数目
		for (int i = 0; i < src.length; i++) {
			if (src[i] == null) {
				count++;
			}
		}
		//剔除
		if (count == 0) {
			tmp = src;
		} else if (count < src.length) {
			tmp = new String[src.length - count];
			int j = 0;
			for (int i = 0; i < src.length; i++) {
				if (src[i] != null) {
					tmp[j++] = src[i];
				}
			}
		}

		return tmp;
	}

	public static String convertToISO(String str) {
		String sRetVal = "";
		if (str == null) {
			sRetVal = "";
		} else {
			try {
				sRetVal = new String(str.trim().getBytes("ISO8859_1"), "GBK");
			} catch (UnsupportedEncodingException ex) {
				sRetVal = "";
			}
		}
		return sRetVal;
	}

	public static String convertToISO2(String str) {
		String sRetVal = "";
		if (str == null) {
			sRetVal = "";
		} else {
			try {
				sRetVal = new String(str.getBytes("ISO8859_1"), "GBK");
			} catch (UnsupportedEncodingException ex) {
				sRetVal = "";
			}
		}
		return sRetVal;
	}

}