我正在尝试使用X509和KeyFactory将以下字符串转换为公钥。到目前为止，我所编写的代码是：

public static void main(String args[]) throws Exception {
    String key = "MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAidRWp1iB0s2LKnAyAxUKCMmsKK9bMTdRUItZVRcV4lB0RXGla0wRTNeR6r5oqNo6poHUJ+QGPjAHDCztMjAZdtuMSQ+Lohn+TjDMIEi2sUNeXhZuXchwEE+3QTgPpIOGhjJtv4wmTjXD5UaZbYWuydNpgvFEDsF4jf02xM8t8a7nOgQIriPi83fa4XHXcoCcG"
            + "EHDbpbtYUhVq12rJEBXUoVM1zi9LcDhEsgilpzRPlkT6zC+89SkgYHWTRtO2shLpJcnThkR1nyLqHU2Zgn1hSrNsy+T97bNL1Umhcs7e94WJ7WWO6PoSst4cknPIZhhRbeBHoJ9rdV+XLBoew7buDQSht2Jn"
            + "zAm6A6Pvi+XhLVRlIEMLOsG6Y92Lwhuc21oSKeqklv9yDfMznJm0aeCbm3TWZehAfPD9EKJ4LgvSVbT"
            + "tXSiOVvPS8JtzIedISqioSvPPP5v4qqdbqobGBv2uE0sdwYhXh+dTIFSO4WG+dQHMZpdZu38lFBec3y"
            + "EuZJuKpvtX5AvdYgCEwMioZxE3ph4X3SJEbcqfR1KuuGnYwg6nmSEwotDVg55pEtSsgu3j2KRgM8GA"
            + "7lkageikM4D6mq6vQ5fkedfzz8PuvQNe8BH3h2UZYmRjNvfKd8wt2bRKKFK7K4jCYT5riYo+5aEWS"
            + "SrWvL+ECAwEAAQ==";
    getKey(key);
      }
public static PublicKey getKey(String key){
    try{
        byte[] byteKey = Base64.getDecoder().decode(key.getBytes());    
        X509EncodedKeySpec X509publicKey = new X509EncodedKeySpec(byteKey);
        KeyFactory kf = KeyFactory.getInstance("RSA");

        return kf.generatePublic(X509publicKey);
    }
    catch(Exception e){
        e.printStackTrace();
    }

    return null;
}

我收到的错误如下：

java.lang.IllegalArgumentException: Input byte array has wrong 4-byte ending unit
at java.base/java.util.Base64$Decoder.decode0(Base64.java:781)
at java.base/java.util.Base64$Decoder.decode(Base64.java:567)
at WannaCry.getKey(WannaCry.java:46)
at WannaCry.main(WannaCry.java:27)

我不确定我是否拿错了钥匙，因为这是我的作业。这是我必须用的钥匙。

MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAidRWp1iB0s2LKnAyAxUKCMmsKK9bMTdRUItZ
VRcV4lB0RXGla0wRTNeR6r5oqNo6poHUJ+QGPjAHDCzt/MjAZdtuMSQ+Lohn+TjDMIEi2sUNeXhZuXch
w/EE+3QTgPpIOGhjJtv4wmTjXD5UaZbYWuydNpgvFEDsF4jf02xM8t8a7nOgQIriPi83f/a4XHXcoCcG
EHDbpbtYUhVq12rJEBXUoVM1zi9LcDhEsgil/pzRPlkT6zC+89SkgYHWTRtO2shLpJcnThkR1nyLqHU2
Zgn1hSrNsy+T97bNL1Umhcs7/e94WJ7WWO6PoSs/t4cknPIZhhRbeBHoJ9rdV+XLBoew7buDQSht2Jn/
zAm6A6Pvi+XhLVRlIEMLOsG6Y92Lwhuc21oS/Keqklv9yDfMznJm0aeCbm3TWZehAfPD9EKJ4LgvSVbT
tXSiOVvPS8JtzIedISqioSvPPP5v4qqdbqobGBv2uE0sdwYhXh+dTIFSO4WG+dQHMZpdZu38l/FBec3y
EuZJuK/pvtX5AvdYgCEwMioZxE3ph4X3S/JEbcqfR1KuuGnYwg6nmSEwotDVg55pEtSsgu3j2KRgM8GA
7lkageikM4D6m/q6vQ5fkedfzz8PuvQn/Ne8BH3h2UZYmRjNvfKd8wt2bRKKFK7K4jCYT5riYo+5aEWS
SrWvL+ECAwEAAQ==

我当然已经删除了所有的线路断路器（“/”），但我得到这个错误，或者有时我得到
字节数组字符D无效