// build.gradle
apply plugin: 'java'
apply plugin: 'application'
mainClassName = 'GmailQuickstart'
sourceCompatibility = 1.8
targetCompatibility = 1.8
version = '1.0'
repositories {
mavenCentral()
}
dependencies {
compile('com.google.api-client:google-api-client:1.28.0')
compile('com.google.oauth-client:google-oauth-client-jetty:1.28.0')
compile('com.google.apis:google-api-services-gmail:v1-rev101-1.25.0')
}
// GmailQuickstart.java
// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [START gmail_quickstart]
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.gmail.Gmail;
import com.google.api.services.gmail.GmailScopes;
import com.google.api.services.gmail.model.ListMessagesResponse;
import com.google.api.services.gmail.model.Message;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.List;
public class GmailQuickstart {
private static final String APPLICATION_NAME = "Gmail API Java Quickstart";
private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
private static final String TOKENS_DIRECTORY_PATH = "tokens";
/**
* Global instance of the scopes required by this quickstart.
* If modifying these scopes, delete your previously saved tokens/ folder.
*/
private static final List<String> SCOPES = new ArrayList<String>();
static {
SCOPES.add(GmailScopes.GMAIL_LABELS);
SCOPES.add(GmailScopes.GMAIL_READONLY);
}
private static final String CREDENTIALS_FILE_PATH = "/credentials.json";
/**
* Creates an authorized Credential object.
* @param HTTP_TRANSPORT The network HTTP Transport.
* @return An authorized Credential object.
* @throws IOException If the credentials.json file cannot be found.
*/
private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
// Load client secrets.
InputStream in = GmailQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
// Build flow and trigger user authorization request.
GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
.setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
.setAccessType("offline")
.build();
LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8888).build();
return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
}
public static void main(String... args) throws IOException, GeneralSecurityException {
System.setProperty("https.protocols", "TLSv1.2");
// Build a new authorized API client service.
final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
Gmail service = new Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
.setApplicationName(APPLICATION_NAME)
.build();
// Print the labels in the user's account.
String userId = "me";
List<String> labelIds = new ArrayList<String>();
labelIds.add("INBOX");
String query = "from:XXXXX";
ListMessagesResponse response = service.users().messages().list(userId)
.setLabelIds(labelIds).setQ(query).execute();
List<Message> messages = new ArrayList<>();
while (response.getMessages() != null) {
messages.addAll(response.getMessages());
if (response.getNextPageToken() != null) {
String pageToken = response.getNextPageToken();
response = service.users().messages().list(userId).setLabelIds(labelIds).setQ(query)
.setPageToken(pageToken).execute();
} else {
break;
}
}
for (Message message : messages) {
//System.out.println(message.toPrettyString());
System.out.println("Message id: " + message.getId());
message = service.users().messages().get(userId, message.getId()).execute();
System.out.println(message.getSnippet());
}
}
}
// [END gmail_quickstart]
This is the full sample starting from https://developers.google.com/gmail/api/quickstart/java I adjusted some parts to get mail message contents from my gmail account.
I could get the message id but when I tried to get the content of it, it showed the error below.
Message id: 16977563d41f0b93
Exception in thread "main" javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1002)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:162)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:142)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:84)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1040)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:515)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:448)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:565)
at GmailQuickstart.main(GmailQuickstart.java:110)
Caused by: java.io.EOFException: SSL peer shut down incorrectly
at sun.security.ssl.InputRecord.read(InputRecord.java:505)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983)
... 13 more
I added
System.setProperty("https.protocols", "TLSv1.2");
too
UPDATE:
Now with the exactly same code with only TLSv.1.2, it runs. I think it would be the server-side issue which provides mail contents through gmail API. But sometimes it shows the error above.
