Java
Chilkat2 Java
Google Contacts - Retrieve as JSON
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Demonstrates how to retrieve Google Contacts as JSON.Chilkat Java Downloads
import com.chilkatsoft.chilkat2.AuthGoogle;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.StringBuilder;
public class ChilkatExample {
public static void main(String[] args) {
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// --------------------------------------------------------------------------------------------------------
// Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
// Once connected, the REST object may be re-used for many REST API calls.
// (It's a good idea to put the connection setup code in a separate function/subroutine.)
// --------------------------------------------------------------------------------------------------------
// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file
// saved by this example: Get Google Contacts OAuth2 Access Token
JsonObject jsonToken = new JsonObject();
try {
jsonToken.loadFile("qa_data/tokens/googleContacts.json");
} catch (ChilkatException e) {
System.out.println("Failed to load googleContacts.json");
return;
}
AuthGoogle gAuth = new AuthGoogle();
gAuth.setAccessToken(jsonToken.stringOf("access_token"));
Rest rest = new Rest();
// Connect using TLS.
boolean bAutoReconnect = true;
rest.connect("www.google.com", 443, true, bAutoReconnect);
// Provide the authentication credentials (i.e. the access token)
rest.setAuthGoogle(gAuth);
// ----------------------------------------------
// OK, the REST connection setup is completed..
// ----------------------------------------------
// To retrieve the contacts, we need to send the following:
// GET /m8/feeds/contacts/default/full
// GData-Version: 3.0
// To get the contacts data in JSON format, set the "alt" query parameter to "json"
rest.addQueryParam("alt", "json");
rest.addHeader("GData-Version", "3.0");
StringBuilder sbResponseBody = new StringBuilder();
try {
rest.fullRequestNoBodySb("GET", "/m8/feeds/contacts/default/full", sbResponseBody);
} catch (ChilkatException e) {
System.out.println(e.getLastErrorText());
return;
}
// A successful response will have a status code equal to 200.
if (rest.getResponseStatusCode() != 200) {
System.out.println("response status code = " + rest.getResponseStatusCode());
System.out.println("response status text = " + rest.getResponseStatusText());
System.out.println("response header: " + rest.getResponseHeader());
System.out.println("response body: " + sbResponseBody.getAsString());
return;
}
// If the 200 response was received, then the contacts JSON is contained
// in the response body.
JsonObject json = new JsonObject();
json.loadSb(sbResponseBody);
json.setEmitCompact(false);
// Save the pretty-printed JSON response to a file.
sbResponseBody.clear();
json.emitSb(sbResponseBody);
sbResponseBody.writeFile("qa_output/google_contacts.json", "utf-8", false);
// Parse the Google Contacts JSON, and iterate over the contacts..
int totalResults = json.intOf("feed.openSearch$totalResults.$t");
int startIndex = json.intOf("feed.openSearch$startIndex.$t");
int itemsPerPage = json.intOf("feed.openSearch$itemsPerPage.$t");
System.out.println("totalResults = " + totalResults);
System.out.println("startIndex = " + startIndex);
System.out.println("itemsPerPage = " + itemsPerPage);
int numEntries = json.sizeOfArray("feed.entry");
int i = 0;
while (i < numEntries) {
json.setI(i);
System.out.println((i + 1) + " ----");
System.out.println("title: " + json.stringOf("feed.entry[i].title.$t"));
String fullName = json.stringOf("feed.entry[i].gd$name.gd$fullName.$t");
if (fullName != null) {
System.out.println("fullName: " + fullName);
}
// There can be multiple email addresses, so it's stored as a JSON array..
int numEmailAddresses = json.sizeOfArray("feed.entry[i].gd$email");
int j = 0;
while (j < numEmailAddresses) {
String emailAddress = json.stringOf("feed.entry[i].gd$email[j].address");
if (emailAddress != null) {
System.out.println("email address: " + emailAddress);
}
j = j + 1;
}
i = i + 1;
}
// A sample Google Contacts JSON response:
// {
// "version": "1.0",
// "encoding": "UTF-8",
// "feed": {
// "xmlns": "http://www.w3.org/2005/Atom",
// "xmlns$openSearch": "http://a9.com/-/spec/opensearch/1.1/",
// "xmlns$gContact": "http://schemas.google.com/contact/2008",
// "xmlns$batch": "http://schemas.google.com/gdata/batch",
// "xmlns$gd": "http://schemas.google.com/g/2005",
// "gd$etag": "\"QHw5eTVSLyt7I2A9XRFaE0kNTwI.\"",
// "id": {
// "$t": "chilkat.support@gmail.com"
// },
// "updated": {
// "$t": "2016-11-17T01:57:41.221Z"
// },
// "category": [
// {
// "scheme": "http://schemas.google.com/g/2005#kind",
// "term": "http://schemas.google.com/contact/2008#contact"
// }
// ],
// "title": {
// "$t": "Chilkat Support's Contacts"
// },
// "link": [
// {
// "rel": "alternate",
// "type": "text/html",
// "href": "https://www.googleapis.com/"
// },
// {
// "rel": "http://schemas.google.com/g/2005#feed",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full"
// },
// {
// "rel": "http://schemas.google.com/g/2005#post",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full"
// },
// {
// "rel": "http://schemas.google.com/g/2005#batch",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full/batch"
// },
// {
// "rel": "self",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full?max-results=25&alt=json"
// },
// {
// "rel": "next",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full?max-results=25&alt=json&start-index=26"
// }
// ],
// "author": [
// {
// "name": {
// "$t": "Chilkat Support"
// },
// "email": {
// "$t": "chilkat.support@gmail.com"
// }
// }
// ],
// "generator": {
// "version": "1.0",
// "uri": "http://www.google.com/m8/feeds",
// "$t": "Contacts"
// },
// "openSearch$totalResults": {
// "$t": "350"
// },
// "openSearch$startIndex": {
// "$t": "1"
// },
// "openSearch$itemsPerPage": {
// "$t": "25"
// },
// "entry": [
// {
// "id": {
// "$t": "http://www.google.com/m8/feeds/contacts/chilkat.support%40gmail.com/base/0"
// },
// "gd$etag": "\"SX8zcTVSLyt7I2A9WxBXFU4MQwI.\"",
// "updated": {
// "$t": "2010-01-26T20:07:48.189Z"
// },
// "app$edited": {
// "xmlns$app": "http://www.w3.org/2007/app",
// "$t": "2010-01-26T20:07:48.189Z"
// },
// "category": [
// {
// "scheme": "http://schemas.google.com/g/2005#kind",
// "term": "http://schemas.google.com/contact/2008#contact"
// }
// ],
// "title": {
// "$t": "Joe Sample"
// },
// "link": [
// {
// "rel": "http://schemas.google.com/contacts/2008/rel#photo",
// "type": "image/*",
// "href": "https://www.googleapis.com/m8/feeds/photos/media/chilkat.support%40gmail.com/0"
// },
// {
// "rel": "self",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full/0"
// },
// {
// "rel": "edit",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full/0"
// }
// ],
// "gd$name": {
// "gd$fullName": {
// "$t": "Joe Sample"
// },
// "gd$givenName": {
// "$t": "Joe"
// },
// "gd$familyName": {
// "$t": "Sample"
// }
// },
// "gd$email": [
// {
// "address": "somebody@gmail.com",
// "primary": "true",
// "rel": "http://schemas.google.com/g/2005#other"
// }
// ]
// },
// ... more entries ...
// }
}
}