The story of embedding Dialogflow in a Java application

Introduction

I created a Java application that incorporates Dialogflow, so The procedure is briefly summarized as a memorandum. When actually using it, I think that you will write the one described here + Swing etc.

Reference material

Development environment

What you need

What is Dialogflow?

Dialogflow is a natural language understanding platform that facilitates the design of conversational user interfaces and integration into mobile apps, web applications, devices, bots, interactive voice response systems, and more. Source: Official Documents

It is used for natural language analysis of Google Home, and is used for AWS [Amazon Lex](https://aws.amazon.com/jp/lex/'https://aws.amazon.com/jp Similar systems include / lex /').

1. GCP project-Creation of Dialogflow interaction model

1.1. Creating a Google Cloud Platform (GCP) project

Create a GCP project to connect Dialogflow.

1.2. Dialogflow Creating a dialogue model

Now let's create a Dialogflow interaction model. For information on creating an interaction model, see the Official Documentation (https://cloud.google.com/dialogflow/docs/quick/build-agent'https://cloud.google.com/dialogflow/docs/quick/build) -agent') and others There is a lot of information on the net, so I will omit it.

This time, it returns "Hello Dialogflow!" To the utterance "test". I have created a test interaction model.

1.3. Download json file for authentication

2. Incorporate Dialogflow into your Java application

2.1. Create maven project

2.2. Creating a package class file

Create packages and class files in the created Maven project.

You have now created a package and a class with the main methods in your Maven project.

2.3. Editing pom.xml

Rewrite the file called pom.xml in the created Maven project as follows.

pom.xml


<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
https://maven.apache.org/xsd/maven-4.0.0.xsd">

  <!--groupId and artifactId...Replace with the one you entered when you created the Maven project.-->
  <modelVersion>4.0.0</modelVersion>
  <groupId>...</groupId>
  <artifactId>...</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
  </properties>
  
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.2</version>
        <configuration>
          <source>${java.version}</source>
          <target>${java.version}</target>
        </configuration>
      </plugin>
      
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>3.0.0</version>
        <configuration>
          <finalName>...</finalName>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
          <archive>
            <manifest>
              <!--of mainClass...Is the package name.The class name.-->
              <mainClass>...</mainClass>
            </manifest>
          </archive>
        </configuration>
        <executions>
          <execution>
            <id>mark-assembly</id>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.google.cloud</groupId>
        <artifactId>libraries-bom</artifactId>
        <version>5.1.0</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  
  <dependencies>
    <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>google-cloud-dialogflow</artifactId>
    </dependency>
  </dependencies>
</project>

When you're done, save and apply pom.xml.

UpdateMavenProject.gif

2.4. Editing Java files

Rewrite the class file containing the main method created earlier as follows.

Main.java


//Replace the package name as appropriate.
package tokyo.penguin_syan.dialogflowTest;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

import com.google.api.client.util.Maps;
import com.google.cloud.dialogflow.v2.DetectIntentResponse;
import com.google.cloud.dialogflow.v2.QueryInput;
import com.google.cloud.dialogflow.v2.QueryResult;
import com.google.cloud.dialogflow.v2.SessionName;
import com.google.cloud.dialogflow.v2.SessionsClient;
import com.google.cloud.dialogflow.v2.TextInput;
import com.google.cloud.dialogflow.v2.TextInput.Builder;

public class Main {

  public static void main(String[] args) {
    Scanner userInput = new Scanner(System.in);
    List<String> text = new ArrayList<String>();
    String input;
    Map<String, QueryResult> ret;
    //sessionId is a suitable number for testing.
    int sessionId = 123456789;

    do {
      System.out.print("\nYou  : ");
      input = userInput.next();
      if(input.equals("exit"))
        System.exit(0);

      text.add(input);
      ret = new HashMap<>();

      try {
        //In the argument---Is the project described in the downloaded json file_Please replace with id.
        ret.putAll(detectIntentTexts(---,
            text, String.valueOf(sessionId++), "ja"));
        System.out.format("Agent: %s\n", ret.get(input).getFulfillmentText());
      } catch (Exception e) {
        e.printStackTrace();
      }

    }while(true);
  }

  public static Map<String, QueryResult> detectIntentTexts(
    String projectId,
    List<String> texts,
    String sessionId,
    String languageCode) throws Exception {
      Map<String, QueryResult> queryResults = Maps.newHashMap();
      try (SessionsClient sessionsClient = SessionsClient.create()) {
        SessionName session = SessionName.of(projectId, sessionId);
        for (String text : texts) {
          Builder textInput = TextInput.newBuilder().setText(text).setLanguageCode(languageCode);
          QueryInput queryInput = QueryInput.newBuilder().setText(textInput).build();
          DetectIntentResponse response = sessionsClient.detectIntent(session, queryInput);
          QueryResult queryResult = response.getQueryResult();
          queryResults.put(text, queryResult);
        }
      }
    return queryResults;
  }

}

2.5. Compile

3. Run

3.1. Creating a bat file for execution

Create a bat file for execution.

dialogflowTest_java.bat


@echo off

rem ---Enter the name of the downloaded json file for authentication.
set GOOGLE_APPLICATION_CREDENTIALS=---.json
java -jar test-jar-with-dependencies.jar

Organize the directory structure for execution.

Directory structure


.
├ test-jar-with-dependencies.jar
├ ---.json
└ dialogflowTest_java.bat

3.2. Execution

To execute it, start the created bat file. run.gif

I was able to execute it safely. ٩ (๑ • ㅂ •) ۶ Wow

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