二进制数组转十六进制

private static String byte2hex(byte [] buffer){
    String h = "";
    for(int i = 0; i < buffer.length; i++){
        String temp = Integer.toHexString(buffer[i] & 0xFF);
        if(temp.length() == 1){
            temp = "0" + temp;
        }
        h = h + " "+ temp;
    }
    return h;
}

private static String byte2Str(byte [] buffer){
    String h = "";
    for(int i = 0; i < buffer.length; i++){
        String temp = Integer.toBinaryString(buffer[i]);
        h = h + " "+ temp;
    }
    return h;
}