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# 使用 Java 应用程序与 Amazon Lex V2 机器人进行交互
<a name="deploy-java"></a>

[适用于 Java 的 AWS SDK 2.0](https://github.com/aws/aws-sdk-java-v2) 提供了一个接口，可用于在 Java 应用程序中与机器人进行交互。使用 SDK for Java 来为用户构建客户端应用程序。

以下应用程序与您在中创建的 OrderFlowers 机器人进行交互。[练习 1：使用模板创建聊天机器人](exercise-1.md)它使用 SDK for Java SDK 中的调用该[RecognizeText](https://docs.aws.amazon.com/lexv2/latest/APIReference/API_runtime_RecognizeText.html)操作来与机器人进行对话。`LexRuntimeV2Client`

该对话的输出如下所示：

```
User : I would like to order flowers
Bot  : What type of flowers would you like to order?
User : 1 dozen roses
Bot  : What day do you want the dozen roses to be picked up?
User : Next Monday
Bot  : At what time do you want the dozen roses to be picked up?
User : 5 in the evening
Bot  : Okay, your dozen roses will be ready for pickup by 17:00 on 2021-01-04.  Does this sound okay?
User : Yes
Bot  : Thanks.
```

有关在客户端应用程序与 Amazon Lex V2 机器人之间发送的 JSON 结构，请参阅[练习 2：查看对话流程](exercise-2.md)。

要运行应用程序，您需要提供以下信息：
+ “botId”：您在创建机器人时为该机器人指定的标识符。您可以在 Amazon Lex V2 控制台的机器人**设置**页面上看到该机器人 ID。
+ botAliasId — 创建机器人别名时分配给它的标识符。您可以在 Amazon Lex V2 控制台的**别名**页面上看到该机器人别名 ID。如果列表中未显示别名 ID，请选择右上角的齿轮图标并打开**别名 ID**。
+ “localeId”：您用于机器人的区域设置的标识符。有关区域设置列表，请参阅[Amazon Lex V2 支持的语言和区域设置](how-languages.md)。
+ “accessKey”和“secretKey”：您账户的身份验证密钥。如果您没有一组密钥，请使用 AWS Identity and Access Management 控制台创建密钥。
+ “sessionId”：与 Amazon Lex V2 机器人会话的标识符。在这种情况下，代码使用随机的 UUID。
+ “region”：如果您的机器人不在美国东部（弗吉尼亚州北部）区域，请务必更改“区域”设置。

应用程序使用名为 `getRecognizeTextRequest` 的函数创建对机器人的单独请求。该函数使用必要参数生成一个请求以发送到 Amazon Lex V2。

```
package com.lex.recognizetext.sample;

import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.lexruntimev2.LexRuntimeV2Client;
import software.amazon.awssdk.services.lexruntimev2.model.RecognizeTextRequest;
import software.amazon.awssdk.services.lexruntimev2.model.RecognizeTextResponse;

import java.net.URISyntaxException;
import java.util.UUID;


/**
 * This is a sample application to interact with a bot using RecognizeText API.
 */
public class OrderFlowersSampleApplication {

    public static void main(String[] args) throws URISyntaxException, InterruptedException {
        String botId = "";
        String botAliasId = "";
        String localeId = "en_US";
        String accessKey = "";
        String secretKey = "";
        String sessionId = UUID.randomUUID().toString();
        Region region = Region.US_EAST_1; // pick an appropriate region

        AwsBasicCredentials awsCreds = AwsBasicCredentials.create(accessKey, secretKey);
        AwsCredentialsProvider awsCredentialsProvider = StaticCredentialsProvider.create(awsCreds);

        LexRuntimeV2Client lexV2Client = LexRuntimeV2Client
                .builder()
                .credentialsProvider(awsCredentialsProvider)
                .region(region)
                .build();

        // utterance 1
        String userInput = "I would like to order flowers";
        RecognizeTextRequest recognizeTextRequest = getRecognizeTextRequest(botId, botAliasId, localeId, sessionId, userInput);
        RecognizeTextResponse recognizeTextResponse = lexV2Client.recognizeText(recognizeTextRequest);

        System.out.println("User : " + userInput);
        recognizeTextResponse.messages().forEach(message -> {
            System.out.println("Bot : " + message.content());
        });

        // utterance 2
        userInput = "1 dozen roses";
        recognizeTextRequest = getRecognizeTextRequest(botId, botAliasId, localeId, sessionId, userInput);
        recognizeTextResponse = lexV2Client.recognizeText(recognizeTextRequest);

        System.out.println("User : " + userInput);
        recognizeTextResponse.messages().forEach(message -> {
            System.out.println("Bot : " + message.content());
        });

        // utterance 3
        userInput = "next monday";
        recognizeTextRequest = getRecognizeTextRequest(botId, botAliasId, localeId, sessionId, userInput);
        recognizeTextResponse = lexV2Client.recognizeText(recognizeTextRequest);

        System.out.println("User : " + userInput);
        recognizeTextResponse.messages().forEach(message -> {
            System.out.println("Bot : " + message.content());
        });

        // utterance 4
        userInput = "5 in evening";
        recognizeTextRequest = getRecognizeTextRequest(botId, botAliasId, localeId, sessionId, userInput);
        recognizeTextResponse = lexV2Client.recognizeText(recognizeTextRequest);

        System.out.println("User : " + userInput);
        recognizeTextResponse.messages().forEach(message -> {
            System.out.println("Bot : " + message.content());
        });

        // utterance 5
        userInput = "Yes";
        recognizeTextRequest = getRecognizeTextRequest(botId, botAliasId, localeId, sessionId, userInput);
        recognizeTextResponse = lexV2Client.recognizeText(recognizeTextRequest);

        System.out.println("User : " + userInput);
        recognizeTextResponse.messages().forEach(message -> {
            System.out.println("Bot : " + message.content());
        });
    }

    private static RecognizeTextRequest getRecognizeTextRequest(String botId, String botAliasId, String localeId, String sessionId, String userInput) {
        RecognizeTextRequest recognizeTextRequest = RecognizeTextRequest.builder()
                .botAliasId(botAliasId)
                .botId(botId)
                .localeId(localeId)
                .sessionId(sessionId)
                .text(userInput)
                .build();
        return recognizeTextRequest;
    }
}
```