以字节为单位，支持汉字双字节的subString

编程技术  /  houtizong 发布于 3年前   97

 

public static String subStringByByte(String str, int beginIndex, int endIndex) {if (beginIndex < 0) throw new StringIndexOutOfBoundsException(beginIndex);if (beginIndex > endIndex) throw new StringIndexOutOfBoundsException(endIndex - beginIndex);if (beginIndex == endIndex) return "";int byteLength = 0;String returnString = "";for (int i = 0; byteLength < endIndex && i < str.length(); i++) {char c = str.charAt(i);byteLength += (31 < c && c < 128) ? 1 : 2;if (byteLength > beginIndex)returnString += c;}return returnString;}