JAVA字符串操作常用方法

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/**
* 随机获取字符串

*
* @param length
* 随机字符串长度

*
* @return 随机字符串

*/
public static String getRandomString(int length) {
  if (length <= 0) {
   return "";
  }
  char[] randomChar = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', 'a', 's', 'd',
    'f', 'g', 'h', 'j', 'k', 'l', 'z', 'x', 'c', 'v', 'b', 'n', 'm' };
  Random random = new Random();
  StringBuffer stringBuffer = new StringBuffer();
  for (int i = 0; i < length; i++) {
   stringBuffer.append(randomChar[Math.abs(random.nextInt()) % randomChar.length]);
  }
  return stringBuffer.toString();
}

/**
* 根据指定长度分隔字符串

*
* @param str
* 需要处理的字符串

* @param length
* 分隔长度
*
* @return 字符串集合

*/
public static List<String> splitString(String str, int length) {
  List<String> list = new ArrayList<String>();
  for (int i = 0; i < str.length(); i += length) {
   int endIndex = i + length;
   if (endIndex <= str.length()) {
    list.add(str.substring(i, i + length));
   } else {
    list.add(str.substring(i, str.length() - 1));
   }
  }
  return list;
}

/**
* 将字符串List转化为字符串，以分隔符间隔.
*
* @param list
*            需要处理的List.
*
* @param separator
*            分隔符.
*
* @return 转化后的字符串

*/
public static String toString(List<String> list, String separator) {
  StringBuffer stringBuffer = new StringBuffer();
  for (String str : list) {
   stringBuffer.append(separator + str);
  }
  stringBuffer.deleteCharAt(0);
  return stringBuffer.toString();
}

/**
* 随机获取UUID字符串(无中划线)
*
* @return UUID字符串

*/
public static String getUUID() {
String uuid = UUID.randomUUID().toString();
return uuid.substring(0, 8) + uuid.substring(9, 13) + uuid.substring(14, 18) + uuid.substring(19, 23) + uuid.substring(24);
}