java-我收到“构造函数Base64()不可见错误”

概述我正在尝试从flicker.com生成OAUTH签名.我从以下位置获得了源代码：Absoluteminimumcodetogetavalidoauth_signaturepopulatedinJavaorGroovy?但是,当我尝试执行它时,出现“构造函数Base64()不可见错误”.我的课是：publicclassMainActivityextendsActivity{

我正在尝试从flicker.com生成OAUTH签名.我从以下位置获得了源代码：

Absolute minimum code to get a valid oauth_signature populated in Java or Groovy?

但是,当我尝试执行它时,出现“构造函数Base64()不可见错误”.

我的课是：

public class MainActivity extends Activity {    button login;    //---------------------------------------------     static String key = "key";     static String secret = "secret";     static final String HMAC_SHA1 = "HmacSHA1";     static final String ENC = "UTF-8";      static Base64 base64 = new Base64();     @SuppressWarnings("static-access")    private static String getSignature(String url, String params)             throws UnsupportedEnCodingException, NoSuchAlgorithmException,             InvalIDKeyException {         /**          * base has three parts, they are connected by "&": 1) protocol 2) URL          * (need to be URLEncoded) 3) Parameter List (need to be URLEncoded).          */         StringBuilder base = new StringBuilder();         base.append("GET&");         base.append(url);         base.append("&");         base.append(params);         System.out.println("Stirng for oauth_signature generation:" + base);         // yea, don't ask me why, it is needed to append a "&" to the end of         // secret key.         byte[] keyBytes = (secret + "&").getBytes(ENC);         SecretKey key = new SecretKeySpec(keyBytes, HMAC_SHA1);         Mac mac = Mac.getInstance(HMAC_SHA1);         mac.init(key);         // encode it, base64 it, change it to string and return.         return new String(base64.encode(mac.doFinal(base.toString().getBytes(                 ENC)), 0, 0, 0), ENC).trim();     }    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.main);        login=(button)findVIEwByID(R.ID.login_button);        login.setonClickListener(new OnClickListener() {            public voID onClick(VIEw v)  { httpClIEnt httpclIEnt = new DefaulthttpClIEnt();            List<nameValuePair> qparams = new ArrayList<nameValuePair>();            // These params should ordered in key            qparams.add(new BasicnameValuePair("oauth_callback", "oob"));            qparams.add(new BasicnameValuePair("oauth_consumer_key", key));            qparams.add(new BasicnameValuePair("oauth_nonce", ""                    + (int) (Math.random() * 100000000)));            qparams.add(new BasicnameValuePair("oauth_signature_method",                    "HMAC-SHA1"));            qparams.add(new BasicnameValuePair("oauth_timestamp", ""                    + (System.currentTimeMillis() / 1000)));            qparams.add(new BasicnameValuePair("oauth_version", "1.0"));            // generate the oauth_signature            String signature = getSignature(URLEncoder.encode(                    "http://www.flickr.com/services/oauth/request_token", ENC),                    URLEncoder.encode(URLEncodedUtils.format(qparams, ENC), ENC));            // add it to params List            qparams.add(new BasicnameValuePair("oauth_signature", signature));            // generate URI which lead to access_token and token_secret.            URI uri = URIUtils.createURI("http", "www.flickr.com", -1,                    "/services/oauth/request_token",                    URLEncodedUtils.format(qparams, ENC), null);            System.out.println("Get Token and Token Secrect from:"                    + uri.toString());            httpGet httpget = new httpGet(uri);            // output the response content.            System.out.println("oken and Token Secrect:");            httpResponse response = httpclIEnt.execute(httpget);            httpentity entity = response.getEntity();            if (entity != null) {                inputStream instream = entity.getContent();                int len;                byte[] tmp = new byte[2048];                while ((len = instream.read(tmp)) != -1) {                    System.out.println(new String(tmp, 0, len, ENC));                }            }            }        });    }    @OverrIDe    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    public voID makeAToast(String str) {        //yet to implement        Toast toast = Toast.makeText(this,str, Toast.LENGTH_LONG);        toast.setGravity(Gravity.CENTER, 0, 0);        toast.show();    }}

解决方法:

您不能实例化Base64类,因为它的构造函数是私有的.检查源Base64(线号740).您直接提供了静态方法,可以直接将它们作为Base64.encode(string)调用.检查doc

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