用Java实现按字节长度截取中英文数字字符串的方法总结

public static String subStr(String str, int subSLength)

throws UnsupportedEncodingException {

if (str == null)

return null;

else {

int tempSubLength = subSLength;// 截取字节数

String subStr = str.substring(0, subSLength);// 截取的子串

int subStrByetsL = subStr.getBytes("UTF-8").length;// 截取子串的字节长度

// 说明截取的字符串中包含有汉字

while (subStrByetsL > tempSubLength) {

subStr = str.substring(0, --subSLength);

subStrByetsL = subStr.getBytes("UTF-8").length;

}

return subStr;

}

}