JSP字符串截取类..

<s:bean name="com.hwtt.rbt.user.bean.CutStringBean" id="cutString">
<s:param name="str" value="singerName"/>
<s:param name="hold" value="3"/>
<s:property value="formatStr"/>
</s:bean>

public class CutStringBean {

private String str;//要格式化的字符串
private int hold;//保留的长度
private String end;//结束符
private String formatStr;//格式化后的字符串

private static final String END = "..";

public CutStringBean() {
}

public String getStr() {
return str;
}

public void setStr(String str) {
this.str = str;
}

public int getHold() {
return hold;
}

public void setHold(int hold) {
this.hold = hold;
}

public String getEnd() {
return end;
}

public void setEnd(String end) {
this.end = end;
}

public String getFormatStr() {
formatStr = getShortStr(str, hold, end);
return formatStr;
}

public void setFormatStr(String formatStr) {
this.formatStr = formatStr;
}

/**
* 将字符串缩短到指定长度，且与结束符结束
*
* @param str
* @param hold 保留的长度
* @param end  结束字符串，为空则为“..”
* @return String
*/
public String getShortStr(String str, int hold, String end) {
if (str == null || hold < 1) return "";
str = str.trim();
if (hold > str.length()) return str;

//        int length = (hold % 2) != 0 ? hold - 1 : hold;
end = end == null ? END : end;
int abc123Size=0;//数字和字母个数
if (str.length() > hold){
for(int i=0;i<hold;i++){
if(java.util.regex.Pattern.matches("[a-zA-Z0-9]",""+str.charAt(i))){ //判断数字或字母时增1
abc123Size++;
}
}

int tempHold = hold;
int twoAbc123=0;
for(int i=tempHold;i<tempHold+abc123Size && i<str.length();i++){
if(java.util.regex.Pattern.matches("[a-zA-Z0-9]",""+str.charAt(i))){ //如果是数字或字母时长度增1
hold++;
}else if(twoAbc123 == 1){//一个中文需要两个数字或字母
hold++;
twoAbc123=0;
}else{
twoAbc123++;
}
}
return hold >= str.length() ? str : str.substring(0, hold) + end;
}
return str;
}

}