import org.apache.commons.codec.binary.Base64;
public class UtilHelper {	
	//base64字串轉byte[]
	public static byte[] base64String2ByteFun(String base64Str){
		return Base64.decodeBase64(base64Str);
	}
	//byte[]轉base64
	public static String byte2Base64StringFun(byte[] b){
		return Base64.encodeBase64String(b);
	}
}
 

public static void main(String[] args) {
		String str="我是中國人";
		byte[] arr=str.getBytes();
		System.out.println("列印："+arr);
		String str2=new String(arr);
		System.out.println("列印2："+str2);
	}