Java Json Object 到 ZEED8D85B888A6C0153334240885EE6 数组转换

Question

Im new to java.I am trying to get data from stored procedure and convert it into json array. But Im facing some problems with my code.

           /*** Get data from stored procedure ***/
           Map<String, Object> out =  simpleJdbcCall.execute(in);
           /*** Convert to JSONObjects ***/
           JSONObject jsonRes = new JSONObject();
           jsonRes.put("body", out.get("#result-set-1"));
           System.out.println(out.get("#result-set-1"));

output :

          [{user_id=484, user_name="abc", email=null, contact_no=123456789}, 
           {user_id=485, user_name=xyz, email=null, contact_no=235612354}]

Expected output :

          {
            "body":
                "Data":{
                        {
                         {user_id=484, user_name="abc", email=null, contact_no=123456789},
                         {user_id=485, user_name=xyz, email=null, contact_no=235612354}
                        }
                       }
           }   

Answer 1

Try using HashMap You can nest as many elements(HashMaps) as you want. Here is an example

Map<String, Object> out =  simpleJdbcCall.execute(in);    
Map<String, Object> users = new HashMap<String, Object>();

users.put( "0", out.get("#result-set-1") );
        
Map<String, Object> data = new HashMap<String, Object>();
data.put( "Data", users );
Map<String, Object> body = new HashMap<String, Object>();
body.put( "body", data );
       
JSONObject json = new JSONObject();
json.putAll( body );
System.out.printf( "JSON: %s", json.toString(2) );

Answer 2

In your last line, print jsonRes instead of out.get("#result-set-1") :

System.out.println(jsonRes);

Then you will see something closer to what you expect, probably pretty similar to:

{
 "body": [
   {user_id=484, user_name="abc", email=null, contact_no=123456789},
   {user_id=485, user_name=xyz, email=null, contact_no=235612354}
 ]
}   

If it works out like this, then body is the JsonArray

Answer 3

You can also use ObjectMapper(Jackson)

String output = <Stored_Procedure_Output>;
ObjectMapper objectMapper = new ObjectMapper();
ArrayNode arrayNode = objectMapper.readValue(output, ArrayNode.class);
for(int i=0;i<arrayNode.size;i++){
   JsonNode obj = arrayNode.get(i);
   // You can use the obj to retrieve each object
}