import java.util.regex.Matcher;  
 import java.util.regex.Pattern;
 
 public class Test{
  public static void main(String[] args) {
    String str = "123abc中文cde123abc提取123ab我ABC汉DEF和我们678，854中华人民共和国，美国"; 
    Pattern p = null;
    Matcher m = null; 
    String value = null;
    p = Pattern.compile("([\u4e00-\u9fa5]+)");
    m = p.matcher(str);
    while (m.find()) {
     value = m.group(0);
     System.out.println(value);
    }
  }
}