判断字符串中是否包含汉字

import java.util.regex.Matcher;  
import java.util.regex.Pattern;  


public class IfHanZi {  

public static void main(String[] args) {  
    //方法一：  
    String s1 = "我是中国人";  
    String s2 = "imchinese";  
    String s3 = "im中国人";  
    System.out.println(s1 + ":" + new String(s1).length());  
    System.out.println(s2 + ":" + new String(s2).length());  
    System.out.println(s3 + ":" + new String(s3).length());  
    System.out.println((s1.getBytes().length == s1.length()) ? "s1无汉字":"s1有汉字");  
    System.out.println((s2.getBytes().length == s2.length()) ? "s2无汉字":"s2有汉字");  
    System.out.println((s3.getBytes().length == s3.length()) ? "s3无汉字":"s3有汉字");  


    //方法二：  
    int count = 0;  
    String regEx = "[\\u4e00-\\u9fa5]";  
    String str = "中文fd我是中国人as ";  
    Pattern p = Pattern.compile(regEx);  
    Matcher m = p.matcher(str);  
    while (m.find()) {  
     for (int i = 0; i <= m.groupCount(); i++) {  
       count = count + 1;  
     }  
    }  
    System.out.println("共有 " + count + "个 ");  
    }  

}  

http://xhfei.iteye.com/blog/815943