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Converting DynamoDB JSON to Standard JSON with Java

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说谎
说谎 2020-12-16 06:36

I need to convert a AWS DYNAMODB JSON to a standard JSON object. so I can remove the data type from the DynamoDB JSON Something more like:

in DYNAMODB JSON:

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  • 挽巷
    挽巷 (楼主)
    2020-12-16 07:25

    Following is a simple solution which can be applied to convert any DynamoDB Json to Simple JSON.

    //passing the reponse.getItems() 
public static Object getJson(List> mapList) {
    List finalJson= new ArrayList();
    for(Map eachEntry : mapList) {
        finalJson.add(mapToJson(eachEntry));
    }
    return finalJson;
}


//if the map is null then it add the key and value(string) in the finalKeyValueMap
public static Map mapToJson(Map keyValueMap){
    Map finalKeyValueMap = new HashMap();
    for(Map.Entry entry : keyValueMap.entrySet()) 
    {
        if(entry.getValue().getM() == null) {
            finalKeyValueMap.put(entry.getKey(),entry.getValue().getS());
        }
        else {
            finalKeyValueMap.put(entry.getKey(),mapToJson(entry.getValue().getM()));
        }
    }
    return finalKeyValueMap;
}



    This will produce your desired Json in the form of List>. Then using the Gson you can convert it into the Json format. 
    


    Gson gson = new Gson();
String jsonString = gson.toJson(getJson(response.getItems()));

    
    
    
             
    
                                                        
    
            
            
    
              
                
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