Java中英文字符长度截取问题
Java中英文字符长度截取问题
- /**
- * 字符串按字节截取
- * @param str 原字符
- * @param len 截取长度
- * @return String
- * @author ivan
- * @since 2010.07.05
- */
- public static String splitString(String str, int len) {
- return splitString(str, len, "...");
- }
- /**
- * 字符串按字节截取
- * @param str 原字符
- * @param len 截取长度
- * @param elide 省略符
- * @return String
- * @author ivan
- * @since 2010.07.05
- */
- public static String splitString(String str,int len,String elide) {
- if (str == null) {
- return "";
- }
- byte[] strByte = str.getBytes();
- int strLen = strByte.length;
- //int elideLen = (elide.trim().length() == 0) ? 0 : elide.getBytes().length;
- int elideLen = 0;
- if (len >= strLen || len < 1) {
- return str;
- }
- if (len - elideLen > 0) {
- len = len - elideLen;
- }
- int count = 0;
- for (int i = 0; i < len; i++) {
- int value = (int) strByte[i];
- if (value < 0) {
- count++;
- }
- }
- if (count % 2 != 0) {
- len = (len == 1) ? len + 1 : len - 1;
- }
- return new String(strByte, 0, len) + elide.trim();
- }
- public static String subStr(String str, int num) {
- int max = num;
- try {
- max = trimGBK(str.getBytes("GBK"),num);
- } catch (UnsupportedEncodingException e) {
- e.printStackTrace();
- }
- int sum = 0;
- if (str != null && str.length() > max) {
- StringBuilder sb = new StringBuilder(max);
- for (int i = 0; i < str.length(); i++) {
- int c = str.charAt(i);
- // if ((c & 0xff00) != 0)
- // sum += 2;
- // else
- sum += 1;
- if (sum <= max)
- sb.append((char) c);
- else
- break;
- }
- return sb.append("...").toString();
- } else
- return str != null ? str : "";
- }
- public static int trimGBK(byte[] buf,int n){
- int num = 0;
- boolean bChineseFirstHalf = false;
- if(buf.length < n )return buf.length;
- for(int i=0;i<n;i++)
- {
- if(buf[i]<0 && !bChineseFirstHalf){
- bChineseFirstHalf = true;
- }else{
- num++;
- bChineseFirstHalf = false;
- }
- }
- return num;
- }
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