AWS 提供此 Java 代码以在 rekognition 中执行视频分析。但是，在 Eclipse 中查看时会出现错误消息：
The public type JobCompletionHandler must be defined in its own file
在 AWS 中调用该函数时，它还会在 cloudwatch 日志中抱怨：
Unresolved compilation problem: The public type JobCompletionHandler must be defined in its own file : java.lang.Error java.lang.Error: Unresolved compilation problem: The public type JobCompletionHandler must be defined in its own file at com.amazonaws.lambda.demo.JobCompletionHandler.<init>(LambdaFunctionHandler.java:19) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Met
Unresolved compilation problem:
The public type JobCompletionHandler must be defined in its own file
: java.lang.Error
java.lang.Error: Unresolved compilation problem:
The public type JobCompletionHandler must be defined in its own file
这是 AWS 提供的完整功能：
//Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//PDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazonrekognition-developer-guide/blob/master/LICENSE-SAMPLECODE.)
package com.amazonaws.lambda.demo;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.SNSEvent;
import java.util.List;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.rekognition.AmazonRekognition;
import com.amazonaws.services.rekognition.AmazonRekognitionClientBuilder;
import com.amazonaws.services.rekognition.model.GetLabelDetectionRequest;
import com.amazonaws.services.rekognition.model.GetLabelDetectionResult;
import com.amazonaws.services.rekognition.model.LabelDetection;
import com.amazonaws.services.rekognition.model.LabelDetectionSortBy;
import com.amazonaws.services.rekognition.model.VideoMetadata;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
可以重命名这个公共类和文件名。不需要创建单独的文件。
public class JobCompletionHandler implements RequestHandler<SNSEvent, String> {
@Override
public String handleRequest(SNSEvent event, Context context) {
String message = event.getRecords().get(0).getSNS().getMessage();
LambdaLogger logger = context.getLogger();
// Parse SNS event for analysis results. Log results
try {
ObjectMapper operationResultMapper = new ObjectMapper();
JsonNode jsonResultTree = operationResultMapper.readTree(message);
logger.log("Rekognition Video Operation:=========================");
logger.log("Job id: " + jsonResultTree.get("JobId"));
logger.log("Status : " + jsonResultTree.get("Status"));
logger.log("Job tag : " + jsonResultTree.get("JobTag"));
logger.log("Operation : " + jsonResultTree.get("API"));
if (jsonResultTree.get("API").asText().equals("StartLabelDetection")) {
if (jsonResultTree.get("Status").asText().equals("SUCCEEDED")){
GetResultsLabels(jsonResultTree.get("JobId").asText(), context);
}
else{
String errorMessage = "Video analysis failed for job "
+ jsonResultTree.get("JobId")
+ "State " + jsonResultTree.get("Status");
throw new Exception(errorMessage);
}
} else
logger.log("Operation not StartLabelDetection");
} catch (Exception e) {
logger.log("Error: " + e.getMessage());
throw new RuntimeException (e);
}
return message;
}
void GetResultsLabels(String startJobId, Context context) throws Exception {
LambdaLogger logger = context.getLogger();
AmazonRekognition rek =
AmazonRekognitionClientBuilder.standard().withRegion(Regions.US_EAST_1).build();
int maxResults = 1000;
String paginationToken = null;
GetLabelDetectionResult labelDetectionResult = null;
String labels = "";
Integer labelsCount = 0;
String label = "";
String currentLabel = "";
//Get label detection results and log them.
do {
GetLabelDetectionRequest labelDetectionRequest = new
GetLabelDetectionRequest().withJobId(startJobId)
.withSortBy(LabelDetectionSortBy.NAME).withMaxResults(maxResults).withNextToken(paginationToken);
labelDetectionResult = rek.getLabelDetection(labelDetectionRequest);
paginationToken = labelDetectionResult.getNextToken();
VideoMetadata videoMetaData = labelDetectionResult.getVideoMetadata();
// Add labels to log
List<LabelDetection> detectedLabels = labelDetectionResult.getLabels();
for (LabelDetection detectedLabel : detectedLabels) {
label = detectedLabel.getLabel().getName();
if (label.equals(currentLabel)) {
continue;
}
labels = labels + label + " / ";
currentLabel = label;
labelsCount++;
}
} while (labelDetectionResult != null && labelDetectionResult.getNextToken() != null);
logger.log("Total number of labels : " + labelsCount);
logger.log("labels : " + labels);
}
}
如何更正此代码，以免公共类显示错误？