issues about json format returned by spring restful? -

class entitydataset {       public list<entityrow> getdata() {         return rowlist;      }  class entityrow {       private map<string, object> rowdata;        public map<string, object> getrowdata() {         return rowdata;     } } 

i wrote method in restful controller below.

@requestmapping(value = "/entitydata", method = requestmethod.post, headers = "accept=application/json") public entitydataset getentitydata(@requestbody queryobject query) throws exception{     return entitymanager.generateentitydatabyname(query); } 

the returned json looked below.

{     "data": [         {             "rowdata": {                 "fiscal_year_end": null,                 "home_country": null             }         },         {             "rowdata": {                 "fiscal_year_end": null,                 "home_country": "10"             }         },         .................. 

but want below.

{     "data": [         {                 "fiscal_year_end": null,                 "home_country": null         },         {                 "fiscal_year_end": null,                 "home_country": "10"         }, 

how can implement it? thanks.

it can done (if using jackson) using @jsonanysetter , @jsonanygetter annotations in entityrow class:

import java.util.arraylist; import java.util.list;  import com.fasterxml.jackson.annotation.jsonproperty;  public class entitydataset {      @jsonproperty("data")     private list<entityrow> rowlist;      /**      * @return rowlist      */     public list<entityrow> getrowlist() {         return rowlist;     }      /**      * @param rowlist rowlist set      */     public void setrowlist(list<entityrow> rowlist) {         this.rowlist = rowlist;     }      /**      *       * @param row      */     public void add(entityrow row){         if(this.rowlist == null){             this.rowlist = new arraylist<entityrow>();         }         this.rowlist.add(row);     } } 

this key class, entityrow @jsonanysetter , @jsonanygetter annotations

import java.util.map;  import com.fasterxml.jackson.annotation.jsonanygetter; import com.fasterxml.jackson.annotation.jsonanysetter;   public class entityrow {      private map<string, object> rowdata;      /**      * @param rowdata rowdata set      */     @jsonanysetter     public void setrowdata(map<string, object> rowdata) {         this.rowdata = rowdata;     }      @jsonanygetter     public map<string, object> getrowdata() {         return rowdata;     } } 

a main test it:

import java.util.hashmap; import java.util.map; import com.fasterxml.jackson.core.jsonprocessingexception; import com.fasterxml.jackson.databind.objectmapper;  public class test4 {      public static string getjsonstring(object o){         objectmapper mapper = new objectmapper();          //for testing         try {             //convert object json string             string jsoninstring = mapper.writevalueasstring(o);             //system.out.println(jsoninstring);             return jsoninstring;           } catch (jsonprocessingexception e){             e.printstacktrace();         }          return null;     }      public static void main(string args[]){          map<string, object> map = new hashmap<string, object>();         map.put("fiscal_year_end", null);         map.put("home_country", null);          map<string, object> map2 = new hashmap<string, object>();         map2.put("fiscal_year_end", null);         map2.put("home_country", "10");          entityrow row1 = new entityrow();         row1.setrowdata(map);          entityrow row2 = new entityrow();         row2.setrowdata(map2);          entitydataset entitydataset = new entitydataset();         entitydataset.add(row1);         entitydataset.add(row2);          system.out.println(test4.getjsonstring(entitydataset));     } } 

finally, output:

    {"data":            [              {                  "fiscal_year_end":null,                  "home_country":null              },              {                  "fiscal_year_end":null,                  "home_country":"10"              }            ]     }