Google Natural Language Client for Java

Java idiomatic client for Natural Language.

• Product Documentation
• Client Library Documentation

Quickstart

If you are using Maven with BOM, add this to your pom.xml file

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>libraries-bom</artifactId>
      <version>9.1.0</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-language</artifactId>
  </dependency>

If you are using Maven without BOM, add this to your dependencies:

<dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-language</artifactId>
  <version>1.100.0</version>
</dependency>

If you are using Gradle, add this to your dependencies

compile 'com.google.cloud:google-cloud-language:1.101.0'

If you are using SBT, add this to your dependencies

libraryDependencies += "com.google.cloud" % "google-cloud-language" % "1.101.0"

Authentication

See the Authentication section in the base directory's README.

Getting Started

Prerequisites

You will need a Google Cloud Platform Console project with the Natural Language API enabled. You will need to enable billing to use Google Natural Language. Follow these instructions to get your project set up. You will also need to set up the local development environment by installing the Google Cloud SDK and running the following commands in command line: gcloud auth login and gcloud config set project [YOUR PROJECT ID].

Installation and setup

You'll need to obtain the google-cloud-language library. See the Quickstart section to add google-cloud-language as a dependency in your code.

About Natural Language

Natural Language provides natural language understanding technologies to developers, including sentiment analysis, entity analysis, entity sentiment analysis, content classification, and syntax analysis. This API is part of the larger Cloud Machine Learning API family.

See the Natural Language client library docs to learn how to use this Natural Language Client Library.

Analyzing sentiment

With Cloud Natural Language, you can analyze the sentiment of text. Add the following imports at the top of your file:

import com.google.cloud.language.v1.LanguageServiceClient;
import com.google.cloud.language.v1.Document;
import com.google.cloud.language.v1.Document.Type;
import com.google.cloud.language.v1.Sentiment;

Then, to analyze the sentiment of some text, use the following code:

// Instantiates a client
LanguageServiceClient language = LanguageServiceClient.create();

// The text to analyze
String[] texts = {"I love this!", "I hate this!"};
for (String text : texts) {
  Document doc = Document.newBuilder().setContent(text).setType(Type.PLAIN_TEXT).build();
  // Detects the sentiment of the text
  Sentiment sentiment = language.analyzeSentiment(doc).getDocumentSentiment();

  System.out.printf("Text: \"%s\"%n", text);
  System.out.printf(
      "Sentiment: score = %s, magnitude = %s%n",
      sentiment.getScore(), sentiment.getMagnitude());
}

Complete source code

In AnalyzeSentiment.java we put the code shown above into a complete program.

Samples

Samples are in the samples/ directory. The samples' README.md has instructions for running the samples.

Sample	Source Code	Try it
Quickstart Sample	source code
Set Endpoint	source code

Troubleshooting

To get help, follow the instructions in the shared Troubleshooting document.

Transport

Natural Language uses gRPC for the transport layer.

Java Versions

Java 7 or above is required for using this client.

Versioning

This library follows Semantic Versioning.

Contributing

Contributions to this library are always welcome and highly encouraged.

See CONTRIBUTING for more information how to get started.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms. See Code of Conduct for more information.

License

Apache 2.0 - See LICENSE for more information.

CI Status

Java Version	Status
Java 7
Java 8
Java 8 OSX
Java 8 Windows
Java 11