这对我有帮助：
“ SSL 绝对需要。
这种身份验证方式只有在使用 SSL 时才安全。因此，所有请求（获取和使用令牌）都必须使用 HTTPS 端点”（(c) https://dev.twitter.com/docs /auth/application-only-auth )
所以你必须使用 HttpsURLConnection 而不是 Http。之后检查你是否获得了令牌，它看起来像“AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA%2FAAAAAAAAAAAAAAAAAAAAAA%3DAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA”。
这是一个例子：
private final static String getTokenURL = "https://api.twitter.com/oauth2/token";
private static String bearerToken;
/**
* @param args
*/
public static void main(String[] args) {
// encodeKeys(APIKEY, APISECRET);
new Thread(new Runnable() {
@Override
public void run() {
try {
bearerToken = requestBearerToken(getTokenURL);
fetchTimelineTweet(twitURL);
} catch (IOException e) {
System.out.println("IOException e");
e.printStackTrace();
}
}
}).start();
}
// Encodes the consumer key and secret to create the basic authorization key
private static String encodeKeys(String consumerKey, String consumerSecret) {
try {
String encodedConsumerKey = URLEncoder.encode(consumerKey, "UTF-8");
String encodedConsumerSecret = URLEncoder.encode(consumerSecret,
"UTF-8");
String fullKey = encodedConsumerKey + ":" + encodedConsumerSecret;
byte[] encodedBytes = Base64.encodeBase64(fullKey.getBytes());
return new String(encodedBytes);
} catch (UnsupportedEncodingException e) {
return new String();
}
}
// Constructs the request for requesting a bearer token and returns that
// token as a string
private static String requestBearerToken(String endPointUrl)
throws IOException {
HttpsURLConnection connection = null;
String encodedCredentials = encodeKeys(APIKEY, APISECRET);
System.out.println("encodedCredentials "+encodedCredentials);
try {
URL url = new URL(endPointUrl);
connection = (HttpsURLConnection) url.openConnection();
System.out.println(connection);
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Host", "api.twitter.com");
connection.setRequestProperty("User-Agent", "anyApplication");
connection.setRequestProperty("Authorization", "Basic "
+ encodedCredentials);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
connection.setRequestProperty("Content-Length", "29");
connection.setUseCaches(false);
writeRequest(connection, "grant_type=client_credentials");
// Parse the JSON response into a JSON mapped object to fetch fields
// from.
JSONObject obj = (JSONObject) JSONValue.parse(readResponse(connection));
if (obj != null) {
String tokenType = (String) obj.get("token_type");
String token = (String) obj.get("access_token");
return ((tokenType.equals("bearer")) && (token != null)) ? token
: "";
}
return new String();
} catch (MalformedURLException e) {
throw new IOException("Invalid endpoint URL specified.", e);
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
// Fetches the first tweet from a given user's timeline
private static String fetchTimelineTweet(String endPointUrl)
throws IOException {
HttpsURLConnection connection = null;
try {
URL url = new URL(endPointUrl);
connection = (HttpsURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("GET");
connection.setRequestProperty("Host", "api.twitter.com");
connection.setRequestProperty("User-Agent", "anyApplication");
connection.setRequestProperty("Authorization", "Bearer " + bearerToken);
connection.setUseCaches(false);
// Parse the JSON response into a JSON mapped object to fetch fields
// from.
JSONArray obj = (JSONArray) JSONValue.parse(readResponse(connection));
System.out.println("JSON obj = "+obj);
if (obj != null) {
String tweet = ((JSONObject) obj.get(0)).get("text").toString();
System.out.println(tweet);
return (tweet != null) ? tweet : "";
}
return new String();
} catch (MalformedURLException e) {
throw new IOException("Invalid endpoint URL specified.", e);
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
// Writes a request to a connection
private static boolean writeRequest(HttpURLConnection connection,
String textBody) {
try {
BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(
connection.getOutputStream()));
wr.write(textBody);
wr.flush();
wr.close();
return true;
} catch (IOException e) {
return false;
}
}
// Reads a response for a given connection and returns it as a string.
private static String readResponse(HttpURLConnection connection) {
try {
StringBuilder str = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String line = "";
while ((line = br.readLine()) != null) {
str.append(line + System.getProperty("line.separator"));
}
return str.toString();
} catch (IOException e) {
return new String();
}
}
}