我想创建一个自动发送电子邮件的Java应用程序，因此我使用的是Ouath2，首先我要使用clidet ID和Secret ID尝试获取accesstoken和refreshtoken，但我无法获取访问令牌，请建议我使用这个。以获得accesstoken和refreshtoken在stackoverflow中给出的波纹管代码，但对我来说，它给出了错误并刷新了令牌变量，我在代码{params.put（“ refresh_token”，“”）;}中留了空，我不知道该放在哪里
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
/**
*
* @author arahman9
*/
public class Oauth2App {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws JSONException {
// TODO code application logic here
String at = getAccessToken();
getAccessToken(at);
}
public static String getAccessToken(String refreshToken) throws JSONException {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("https://accounts.google.com/o/oauth2/token");
try {
String GOOGLE_CLIENT_ID = "xxxxxxxxxxx5lrrb78a44t1lt7moaies.apps.googleusercontent.com";
String GOOGLE_CLIENT_SECRET = "xxxxxxxx2IZkp6Yi0sRI1";
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(4);
nameValuePairs.add(new BasicNameValuePair("grant_type", "refresh_token"));
nameValuePairs.add(new BasicNameValuePair("client_id", GOOGLE_CLIENT_ID));
nameValuePairs.add(new BasicNameValuePair("client_secret", GOOGLE_CLIENT_SECRET));
nameValuePairs.add(new BasicNameValuePair("refresh_token", refreshToken));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
org.apache.http.HttpResponse response = client.execute(post);
BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer buffer = new StringBuffer();
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
buffer.append(line);
}
JSONObject json = new JSONObject(buffer.toString());
String accessToken = json.getString("access_token");
System.out.println(accessToken);
return accessToken;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static String getAccessToken() {
try {
Map<String, Object> params = new LinkedHashMap<>();
params.put("grant_type", "refresh_token");
params.put("client_id","xxxxxxxxxlrrb78a44t1lt7moaies.apps.googleusercontent.com");
params.put("client_secret","xxxxxxxxIZkp6Yi0sRI1");
params.put("refresh_token","");
StringBuilder postData = new StringBuilder();
for (Map.Entry<String, Object> param : params.entrySet()) {
if (postData.length() != 0) {
postData.append('&');
}
postData.append(URLEncoder.encode(param.getKey(), "UTF-8"));
postData.append('=');
postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8"));
}
byte[] postDataBytes = postData.toString().getBytes("UTF-8");
URL url = new URL("https://accounts.google.com/o/oauth2/token");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setDoOutput(true);
con.setUseCaches(false);
con.setRequestMethod("POST");
con.getOutputStream().write(postDataBytes);
BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuffer buffer = new StringBuffer();
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
buffer.append(line);
}
JSONObject json = new JSONObject(buffer.toString());
String accessToken = json.getString("access_token");
return accessToken;
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
}
错误
run:
java.net.UnknownHostException: accounts.google.com
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:625)
at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:160)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1092)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)
at oauth2app.Oauth2App.getAccessToken(Oauth2App.java:98)
at oauth2app.Oauth2App.main(Oauth2App.java:37)
java.net.UnknownHostException: accounts.google.com
at java.net.InetAddress.getAllByName0(InetAddress.java:1252)
at java.net.InetAddress.getAllByName(InetAddress.java:1164)
at java.net.InetAddress.getAllByName(InetAddress.java:1098)
at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:263)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162)
at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:326)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:610)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:445)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at oauth2app.Oauth2App.getAccessToken(Oauth2App.java:55)
at oauth2app.Oauth2App.main(Oauth2App.java:38)
BUILD SUCCESSFUL (total time: 1 second)
新错误
java.io.IOException: Server returned HTTP response code: 400 for URL: https://accounts.google.com/o/oauth2/v2/auth
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
at oauth2.Oauthmain.getAccessToken(Oauthmain.java:99)
at oauth2.Oauthmain.main(Oauthmain.java:36)
Exception in thread "main" org.json.JSONException: A JSONObject text must begin with '{' at character 1
at org.json.JSONTokener.syntaxError(JSONTokener.java:413)
at org.json.JSONObject.<init>(JSONObject.java:180)
at org.json.JSONObject.<init>(JSONObject.java:420)
at oauth2.Oauthmain.getAccessToken(Oauthmain.java:61)
at oauth2.Oauthmain.main(Oauthmain.java:37)
答案 0 :(得分：1)
实际问题出在您的代理上。它可以与您的移动网络配合使用。
新错误StatusCode-> 400表示您发送的请求不正确。您需要以JSON形式发送有效负载。您以错误的格式发送有效负载。在发送之前，使用一些JSON转换器并将您的数据转换为JSON。
StringBuilder postData = new StringBuilder();
for (Map.Entry<String, Object> param : params.entrySet()) {
if (postData.length() != 0) {
postData.append('&');
}
postData.append(URLEncoder.encode(param.getKey(), "UTF-8"));
postData.append('=');
postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8"));
}
byte[] postDataBytes = postData.toString().getBytes("UTF-8");
必须为JSON转换器更改该代码
如果您使用任何代理，请尝试不使用任何代理连接到另一个网络。
尝试将授权端点更改为v2端点https://accounts.google.com/o/oauth2/v2/auth
您要命中的授权端点是旧的。因此，尝试使用 v2