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将字符串截短，取前n个字符，英文算半个字符

/**
* 将字符串截短，取前n个字符，英文算半个字符。
* @param orignalString 原字符串
* @param length 长度
* @param chopedString 超过部分的表示字符串
* @return 截取的字符串
*/
public static String chop(String orignalString,int length,String chopedString) {
if (orignalString==null||orignalString.length()==0) {
return orignalString;
}
orignalString=orignalString.replaceAll(" "," ");
if (orignalString.length()<length) {
return orignalString;
}
StringBuffer buffer=new StringBuffer(length);
length=length*2;
int count=0;
int stringLength=orignalString.length();
int i=0;
for (;count<length&&i<stringLength;i++) {
char c=orignalString.charAt(i);
if (c<´\u00ff´) {
count++;
} else {
count+=2;
}
buffer.append(c);
}
if (i<stringLength) {
buffer.append(chopedString);
}
return buffer.toString();
}