/** * 截取指定長度的字符串，中文算2個(gè)長度，若過長，返回xxx...，否則返回原串 * @param s Original String. * @param max Max length. * @return Left part of string. */ public static String left(String s, int max) { char[] cs = s.toCharArray(); int count = 0; int last = cs.length; for(int i=0; i<cs.length; i++) { if(cs[i]>255) count+=2; else count++; if(count>max) { last = i+1; break; } } if(count<=max) // string is short or just the size! return s; // string is too long: max -= 3; for(int i=last-1; i>=0; i--) { if(cs[i]>255) count-=2; else count--; if(count<=max) { return s.substring(0, i) + "..."; } } return "..."; }
