/**
 * 提取字符串中所有的汉字
 *
 * @param str
 * @return
 * @throws Exception
 */
public String intercept(String str) throws Exception {
    String regex = "[\u4E00-\u9FA5]";//汉字
    Matcher matcher = Pattern.compile(regex).matcher(str);

    StringBuffer sb = new StringBuffer();

    while (matcher.find()) {
        sb.append(matcher.group());
    }

    return sb.toString();
}