This page shows how to get started with the Cloud Client Libraries for the
Pub/Sub API. Client libraries make it easier to access
Google Cloud APIs from a supported language. Although you can use
Google Cloud APIs directly by making raw requests to the server, client
libraries provide simplifications that significantly reduce the amount of code
you need to write.
Read more about the Cloud Client Libraries
and the older Google API Client Libraries
in
Client libraries explained
.
Install the client library
Java
If you are using
Maven
, add
the following to your
pom.xml
file. For more information about
BOMs, see
The Google Cloud Platform Libraries BOM
.
If you are using
Gradle
,
add the following to your dependencies:
If you are using
sbt
, add
the following to your dependencies:
If you're using Visual Studio Code, IntelliJ, or Eclipse, you can add client libraries to your
project using the following IDE plugins:
The plugins provide additional functionality, such as key management for service accounts. Refer
to each plugin's documentation for details.
For more information, see
Setting Up a Java Development Environment
.
Set up authentication
To authenticate calls to Google Cloud APIs, client libraries support
Application Default Credentials (ADC)
;
the libraries look for credentials in a set of defined locations and use those credentials
to authenticate requests to the API. With ADC, you can make
credentials available to your application in a variety of environments, such as local
development or production, without needing to modify your application code.
For production environments, the way you set up ADC depends on the service
and context. For more information, see
Set up Application Default Credentials
.
For a local development environment, you can set up ADC with the credentials
that are associated with your Google Account:
Install and initialize the gcloud CLI
.
When you initialize the gcloud CLI, be sure to specify a
Google Cloud project in which you have permission to
access the resources your application needs.
Configure ADC:
gcloud auth application-default login
A sign-in screen appears. After you sign in, your credentials
are stored in the
local credential file used by ADC
.
Use the client library
The following example shows how to use the client library to
create a Pub/Sub topic.
Additional resources
C++
The following list contains links to more resources related to the
client library for C++:
C#
The following list contains links to more resources related to the
client library for C#:
Go
The following list contains links to more resources related to the
client library for Go:
Java
The following list contains links to more resources related to the
client library for Java:
Node.js
The following list contains links to more resources related to the
client library for Node.js:
PHP
The following list contains links to more resources related to the
client library for PHP:
Python
The following list contains links to more resources related to the
client library for Python:
Ruby
The following list contains links to more resources related to the
client library for Ruby:
Additional Pub/Sub API libraries