判断字符串是否含有中文字符的三种方法

//判断字符串是否含有中文字符的三种方法，正则表达式不能判断标点符号

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

public class Test {
	public static void main(String[] args) {
		System.out.println(checkGBK("。"));
		isChinese("。");
		System.out.println(hasChinese("。"));
	}

	// 方式一
	public static void isChinese(String str) {
		if (str.length() < str.getBytes().length) {
			System.out.println("有中文");
		} else {
			System.out.println("英文");
		}
	}

	// 方式二
	public static boolean checkGBK(String str) {
		String test = "[\\u4E00-\\u9FA5]+";
		Pattern p = Pattern.compile(test);
		Matcher m = p.matcher(str);
		if (m.find()) {
			return true;
		}
		return false;
	}

	// 方式三
	public static boolean hasChinese(String strName) {
		char[] ch = strName.toCharArray();
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < ch.length; i++) {
			char c = ch[i];
			if (isChinese(c) == true) {
				// System.out.print(c);
				return true;
			}
		}
		return false;
	}

	public static boolean isChinese(char c) {
		Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
		if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
				|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
				|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
				|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
				|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
				|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
			return true;
		}
		return false;
	}

}