3

我正在尝试创建一个用 Java 实现的Amazon Lambda函数以与 Amazon Echo/ Alexa一起使用。我使用 Eclipse Mars 作为 IDE。

这是 my LambdaFunctionHandler，它将接收来自 Alexa 的请求，如下所示：

public class LambdaFunctionHandler implements RequestHandler<SpeechletRequestEnvelope, SpeechletResponse> {

    @Override
    public SpeechletResponse handleRequest(SpeechletRequestEnvelope input, Context context) {
        context.getLogger().log("Input: " + input);

        // TODO: implement your handler
        return null;
    }
}

但是，当尝试使用来自 Alexa 的示例 JSON 输入对此进行测试时，我在 Eclipse 中收到错误：

{"errorMessage":"JSON 解析时出错","errorType":"java.lang.RuntimeException","stackTrace":[],"cause":{"errorMessage":"Lcom/fasterxml/jackson/databind /ObjectMapper;","errorType":"java.lang.NoClassDefFoundError","stackTrace":["java.lang.Class.getDeclaredFields0(Native Method)","java.lang.Class.privateGetDeclaredFields(Class.java:2583 )","java.lang.Class.getDeclaredFields(Class.java:1916)","com.fasterxml.jackson.databind.introspect.AnnotatedClass._findFields(AnnotatedClass.java:689)","com.fasterxml.jackson. databind.introspect.AnnotatedClass.resolveFields(AnnotatedClass.java:470)","com.fasterxml.jackson.databind.introspect.AnnotatedClass.fields(AnnotatedClass.java:282)","com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector._addFields(POJOPropertiesCollector.java:390)","com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.collect(POJOPropertiesCollector.java:243)", "com.fasterxml.jackson.databind.introspect.BasicClassIntrospector.collectProperties(BasicClassIntrospector.java:197)","com.fasterxml.jackson.databind.introspect.BasicClassIntrospector.forDeserialization(BasicClassIntrospector.java:110)","com.fasterxml .jackson.databind.introspect.BasicClassIntrospector.forDeserialization(BasicClassIntrospector.java:15)","com.fasterxml.jackson.databind.DeserializationConfig.introspect(DeserializationConfig.java:703)","com.fasterxml.jackson.databind.deser .DeserializerCache._createDeserializer(DeserializerCache.java:330)","com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:265)","com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:245)", "com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:143)","com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:439)","com.fasterxml.jackson .databind.ObjectReader._prefetchRootDeserializer(ObjectReader.java:1588)","com.fasterxml.jackson.databind.ObjectReader.(ObjectReader.java:185)","com.fasterxml.jackson.databind.ObjectMapper._newReader(ObjectMapper. java:558)","com.fasterxml.jackson.databind.ObjectMapper.reader(ObjectMapper.java:3098)"],"原因":{"errorMessage":"com.fasterxml.jackson.databind.ObjectMapper","errorType":"java.lang.ClassNotFoundException","stackTrace":["java.net.URLClassLoader.findClass(URLClassLoader.java :381)","java.lang.ClassLoader.loadClass(ClassLoader.java:424)","java.lang.ClassLoader.loadClass(ClassLoader.java:357)","java.lang.Class.getDeclaredFields0(Native Method )","java.lang.Class.privateGetDeclaredFields(Class.java:2583)","java.lang.Class.getDeclaredFields(Class.java:1916)","com.fasterxml.jackson.databind.introspect.AnnotatedClass。 _findFields(AnnotatedClass.java:689)","com.fasterxml.jackson.databind.introspect.AnnotatedClass.resolveFields(AnnotatedClass.java:470)","com.fasterxml.jackson.databind.introspect.AnnotatedClass.fields(AnnotatedClass.java:282)","com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector._addFields(POJOPropertiesCollector.java:390)","com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.collect( POJOPropertiesCollector.java:243)","com.fasterxml.jackson.databind.introspect.BasicClassIntrospector.collectProperties(BasicClassIntrospector.java:197)","com.fasterxml.jackson.databind.introspect.BasicClassIntrospector.forDeserialization(BasicClassIntrospector.java: 110)","com.fasterxml.jackson.databind.introspect.BasicClassIntrospector.forDeserialization(BasicClassIntrospector.java:15)","com.fasterxml.jackson.databind.DeserializationConfig.introspect(DeserializationConfig.java:703)","com .fasterxml.jackson.databind.deser.DeserializerCache。_createDeserializer(DeserializerCache.java:330)","com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:265)","com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache. java:245)","com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:143)","com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:439)", "com.fasterxml.jackson.databind.ObjectReader._prefetchRootDeserializer(ObjectReader.java:1588)","com.fasterxml.jackson.databind.ObjectReader.(ObjectReader.java:185)","com.fasterxml.jackson.databind. ObjectMapper._newReader(ObjectMapper.java:558)","com.fasterxml.jackson.databind。ObjectMapper.reader(ObjectMapper.java:3098)"]}}}

这是我的 JSON 输入（取自在线的TestColors 示例）：

{
  "session": {
    "new": false,
    "sessionId": "session1234",
    "attributes": {},
    "user": {
      "userId": null
    },
    "application": {
      "applicationId": "amzn1.echo-sdk-ams.app.[unique-value-here]"
    }
  },
  "version": "1.0",
  "request": {
    "intent": {
      "slots": {
        "Color": {
          "name": "Color",
          "value": "red"
        }
      },
      "name": "MyColorIsIntent"
    },
    "type": "IntentRequest",
    "requestId": "request5678"
  }
}

因此，显然 AmazonSpeechletRequestEnvelope不是handleRequest().

handleRequest()接收来自 Alexa 的请求的正确方法签名是什么？

我找不到适用于 Alexa/Echo 的 Amazon Lambda 的 Java 示例。

4

2 回答 2

6

这是一个完整的工作示例：

public class LambdaFunctionHandler implements RequestStreamHandler {

    @Override
    public void handleRequest(InputStream inputStream, OutputStream output, Context context) throws IOException {
        byte serializedSpeechletRequest[] = IOUtils.toByteArray(inputStream);
        SpeechletRequestEnvelope requestEnvelope = SpeechletRequestEnvelope.fromJson(serializedSpeechletRequest);
        SpeechletRequest speechletRequest = requestEnvelope.getRequest();

        if (speechletRequest instanceof IntentRequest) {
            IntentRequest ir = (IntentRequest) speechletRequest;
            String outString = "IntentRequest name: " + ir.getIntent().getName();
            context.getLogger().log(outString);
            output.write(outString.getBytes());
        }
    }
}

请注意，此类实现RequestStreamHandler，而不是RequestHandler。

使用问题中的输入 JSON，output.write(outString.getBytes())将导致 Eclipse AWS Lambda 控制台的输出：

==================== 函数输出 ====================

IntentRequest 名称：MyColorIsIntent

...同时context.getLogger().log(outString);导致同一行在线写入 Amazon Lambda 控制台。

您还需要确保/lib项目中有一个文件夹，并且需要包含以下 JAR：

  • commons-codec-1.6.jar
  • commons-lang3-3.x.jar
  • jackson-annotations-2.3.2.jar
  • 杰克逊核心2.3.2.jar
  • jackson-databind-2.3.2.jar
  • JakartaCommons-IO-2.4.jar
  • joda-time-2.3.jar
  • log4j.1.2.17.jar
  • servlet-api-3.0.jar
  • slf4j-api-1.7.4.jar
  • slf4j-log4j12-1.7.4.jar
  • alexa-skills-kit-1.0.jar

这些 JAR 可以从Maven Central下载，或者从AlexaSkillsKit.zip中的“第三方”子文件夹下载。

在 Eclipse 中，您需要刷新项目以便它在/lib目录中看到 JAR 文件（只需按 F5），然后将 JAR 添加到 Java 构建路径：

  1. 在 Eclipse 中右键单击 Lambda 项目的根目录
  2. 点击“属性”
  3. 选择“Java 构建路径”
  4. 选择“库”选项卡
  5. 单击“添加 JAR”
  6. 浏览到“lib”
  7. 选择“lib”文件夹中的所有 JAR，然后单击“Ok”，直到您返回主 Eclipse 屏幕

感谢 @jephers 指向 Github 上这个很棒的教程的指针，我将其中的很多内容拼凑在一起：

https://github.com/jjaquinta/EchoProofOfConcepts/tree/master/jo.echo.lambda

于 2015-08-26T02:55:55.333 回答
1

我扩展了 jo.echo.lambda.utils.SpeechletLambda （https://github.com/jjaquinta/EchoProofOfConcepts/blob/master/jo.echo.lambda/jo/echo/lambda/utils/SpeechletLambda.java），这适用于我：

@Override
public void handleRequest(InputStream inputStream,
        OutputStream outputStream, Context context) throws IOException
{
    super.handleRequest(inputStream, outputStream, context);
}

希望这可以帮助

于 2015-08-25T13:19:45.640 回答