java - Gson custom deserialization but only one field -

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• how decode json unknown field using gson? 1 answer

i'm receiving api long json, e.g.:

{   "field1": "val1",   "field2": "val2",   ...   "some_field": "   abc   ",   ...   "fieldx": "valx" } 

i deserialize gson. works fine field's "some_field" value annoying spaces. trim() field value (api can't changed). know can use jsondeserializer have manually read fields. possible edit 1 interesing field while deserializing use auto deserialization rest of them?

here writing demo class convert json class ignoring of non-used property embedded in json.

here have used objectmapper class deserialize jsonobject object.

 //configuration enables ignore non-used unknow properties. mapper.configure(deserializationfeature.fail_on_unknown_properties, false); 

test class (code convert json class object).

import com.fasterxml.jackson.core.jsonparseexception; import com.fasterxml.jackson.core.jsonprocessingexception; import com.fasterxml.jackson.databind.deserializationfeature; import com.fasterxml.jackson.databind.jsonmappingexception; import com.fasterxml.jackson.databind.objectmapper;  public class test {      /**      * @param args      * @throws ioexception       * @throws jsonprocessingexception       * @throws jsonmappingexception       * @throws jsonparseexception       */     public static void main(string[] args) throws jsonparseexception, jsonmappingexception, jsonprocessingexception, ioexception {         test o = new test();         o.getjsonasobject(o.putjson());      }  //function generate json demo program.     private string putjson() throws jsonprocessingexception{         hashmap<string, string> v_obj = new hashmap<>();         v_obj.put("field1", "vikrant");         v_obj.put("field2", "kashyap");         return new objectmapper().writevalueasstring(v_obj); // change hashmap jsonstring     }     //function convert json object in class object demo program.     private void getjsonasobject(string value) throws jsonparseexception, jsonmappingexception, ioexception{         objectmapper mapper = new objectmapper();         mapper.configure(deserializationfeature.fail_on_unknown_properties, false);         test1 obj = mapper.readvalue(value, test1.class);         system.out.println(obj);     }  } 

test1.java (conversion pojo class)

class test1{      private string field1;      public string getfield1() {         return field1;     }  public void setfield1(string field1) {     this.field1 = field1; } public string tostring(){     return this.field1.tostring(); } 

}

read comment properly.. hope got concept .

thanks