util.java

java写的字符串操作函数～学习用～～～～

public class util {

	public static String replace(String str, String substr, String restr) {
		String tmp[] = split(str, substr);
		String returnstr = null;
		if (tmp.length != 0) {
			returnstr = tmp[0];
			for (int i = 0; i < tmp.length - 1; i++)
				returnstr = dealNull(returnstr) + restr + tmp[i + 1];

		}
		return dealNull(returnstr);
	}

	public static String[] split(String source, String div) {
		int arynum = 0;
		int intIdx = 0;
		int intIdex = 0;
		int div_length = div.length();
		if (source.compareTo("") != 0) {
			if (source.indexOf(div) != -1) {
				intIdx = source.indexOf(div);
				int intCount = 1;
				do {
					if (source.indexOf(div, intIdx + div_length) != -1) {
						intIdx = source.indexOf(div, intIdx + div_length);
						arynum = intCount;
					} else {
						arynum += 2;
						break;
					}
					intCount++;
				} while (true);
			} else {
				arynum = 1;
			}
		} else {
			arynum = 0;
		}
		intIdx = 0;
		intIdex = 0;
		String returnStr[] = new String[arynum];
		if (source.compareTo("") != 0) {
			if (source.indexOf(div) != -1) {
				intIdx = source.indexOf(div);
				returnStr[0] = source.substring(0, intIdx);
				int intCount = 1;
				do {
					if (source.indexOf(div, intIdx + div_length) != -1) {
						intIdex = source.indexOf(div, intIdx + div_length);
						returnStr[intCount] = source.substring(intIdx
								+ div_length, intIdex);
						intIdx = source.indexOf(div, intIdx + div_length);
					} else {
						returnStr[intCount] = source.substring(intIdx
								+ div_length, source.length());
						break;
					}
					intCount++;
				} while (true);
			} else {
				returnStr[0] = source.substring(0, source.length());
				return returnStr;
			}
		} else {
			return returnStr;
		}
		return returnStr;
	}

	public static String dealNull(String str) {
		String returnstr = null;
		if (str == null)
			returnstr = "";
		else
			returnstr = str;
		return returnstr;
	}
}