Question

我试图用来自Java Lambda的POST请求解析'Body'。我暂时坚持这个错误。

 org.json.simple.JSONObject cannot be cast to java.lang.String

但是记录下的Body看起来像那样：

{"body":{"email":"test@test.com"}}

女巫应该解析我做得对吗？奇怪的是，插件在JUNIT本地工作但在AWS之后不在线。

@Override
public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
    logger = context.getLogger();
    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
    Number user_id = null;
    String birthdate = null;
    List<Number> company_id = new ArrayList<Number>();
    String email = null;
    String employment_status = null;
    String firstname = null;
    String lastname = null;
    String login = null;
    String profile = null;
    List<Number> site_id = new ArrayList<Number>();
    String validation_status = null;
    JSONObject responseJson = new JSONObject();

    Map<String, AttributeValue> expressionAttributeValues = new HashMap<String, AttributeValue>();
    String filterExpression = "";
    String RegionAWS = REGION.toString();
    client = AmazonDynamoDBClientBuilder.standard().withRegion(RegionAWS).build();
    DynamoDB dynamoDB = new DynamoDB(client);
    Table table = dynamoDB.getTable("LI_user");
    try {
        JSONParser parser = new JSONParser();
        JSONObject event = (JSONObject) parser.parse(reader);
        logger.log(event.toJSONString());
        if (event.get("body") != null) {
            JSONObject bod = (JSONObject)parser.parse((String)event.get("body"));
         //   JSONObject bod = (JSONObject) event.get("body");
            if ( bod.get("id") != null) {
                user_id = (Number)bod.get("id");
            }
            if ( bod.get("birthdate") != null) {
                birthdate = (String)bod.get("birthdate");
            }
            if ( bod.get("email") != null) {
                email = (String) bod.get("email");
            }
            if ( bod.get("employment_status") != null) {
                employment_status = (String) bod.get("employment_status");
            }
            if ( bod.get("firstname") != null) {
                firstname = (String) bod.get("firstname");
            }
            if ( bod.get("lastname") != null) {
                lastname = (String) bod.get("lastname");
            }
            if ( bod.get("login") != null) {
                login = (String) bod.get("login");
            }
            if ( bod.get("profile") != null) {
                profile = (String) bod.get("profile");
            }
            if ( bod.get("validation_status") != null) {
                validation_status = (String) bod.get("validation_status");
            }
        }

Answer 1

替换

JSONObject bod = (JSONObject)parser.parse((String)event.get("body"));

带

JSONObject bod = (JSONObject)event.get("body");

如果event始终是JSONObject的实例（因为它似乎被授予，否则您将获得JSONObject event = (JSONObject) parser.parse(reader);的ClassCast

您看到已记录

{"body":{"email":"test@test.com"}}

仅仅因为logger.log(event.toJSONString());

Answer 2

谢谢你，我有进步。但现在看来，当我用Postman发送JSON格式的数据时，他收到了正文的字符串版本。我在cloudwatch日志中获得了这些数据：

     "resource": "/users",
    "httpMethod": "POST",
    "queryStringParameters": null,
    "stageVariables": null,
    "body": "{\n \"id\": 5,\n \"company_id\": [\n    1\n  ],\n \"email\": \"test@test.com\",\n \"employment_status\": \"FULL-TIME\",\n \"firstname\": \"Sebastien\",\n \"lastname\": \"LALALLALA\",\n \"login\": \"test@test.com\",\n \"profile\": \"FULL-TIME\",\n \"site_id\": \"55\",\n \"birthdate\": \"1985.05.05\",\n \"validation_status\" : \"COMPLETE\"\n}\n"
}

这个错误：

java.lang.ClassCastException: java.lang.String cannot be cast to org.json.simple.JSONObject

无法使用AWS Lambda JAVA将json.simple.JSONObject强制转换为java.lang.String

2 个答案: