/**
 * 处理字符串工具类
 * @author chexun
 */
public class StringUtil {

    /**
     * 截取服务记录有效长度
     * @param record 服务记录
     * @param wd 热词
     * @param beginIndex 热词前长度
     * @param endIndex 热词后长度
     * @return 服务记录子串
     */
    public static String getSubString(String record,String wd,int beginIndex,int endIndex) {
        String serviceRecord = null;
        int len = record.length();
        int index = record.indexOf(wd);
        int wdLen = wd.length();
        int fromIndex = 0;
        int toIndex = len;
        if (index > -1) {
            if ((index - beginIndex) > fromIndex) {
                fromIndex = index - beginIndex;
            }
            if ((index + wdLen + endIndex) < len) {
                toIndex = index + wdLen + endIndex;
            }
            serviceRecord =record.substring(fromIndex, toIndex);
        }
        return serviceRecord;
    }
}