Wizzer's Blog

/**
 * UTF中文字符编码和解码
 * 中文字符占3个字节，前缀分别是：1110XXXX 10XXXXXX 10XXXXXX
 * 
 * @author FreeDroid
 *
 */
public class Utf8codeANDdecode {

	public static void main(String[] args) {
		int ch = '我';
		byte[] bytes = codeUTF8(ch);
		char ch2 = decodeUTF8(bytes);
		System.out.println(ch2);
	}

	/**
	 * 解码
	 * @param bytes
	 * @return
	 */
	public static char decodeUTF8(byte[] bytes) {
		int ch = (bytes[0]<<12&0xffff)|(bytes[1]<<6&0x3fff)|(bytes[2]&0x3f);
		return (char) ch;
	}
	
	/**
	 * 编码
	 * @param ch
	 * @return
	 */
	public static byte[] codeUTF8(int ch) {
		int b3 = ch & 0x3f | 0x80;
		int b2 = ch >>> 6 & 0x3f | 0x80;
		int b1 = ch >>> 12 & 0xf | 0xe0;
		return new byte[] { (byte) b1, (byte) b2, (byte) b3 };
	}

}