Question

我有一个JSONObject，如下所示，

{
   "field1": "value1",
   "field2": "value2",
   "field3":{
              "field4":"value4",
              "field5":"value5"
            },
   "field6":[{
              "field7":"value7",
              "field8":"value8"
            },{
              "field7":"value9",
              "field8":"value10"
            }]
}

我有一个像这样的字符串列表，

["field1","field3.field4","field6.field7"]

现在，我想在我的JSONObject上应用此过滤器并获得以下输出

{
       "field1": "value1",
       "field3":{
                  "field4":"value4"
                },
       "field6":[{
                  "field7":"value7"
                },{
                  "field7":"value9"
                }]
    }

最简单的方法是什么？

Answer 1

我使用JSONParser写了这个解决方案，但没有机会100％测试它，它希望它能帮助你解决这个问题。

package json.test;
import java.io.IOException;
import java.util.Arrays;
import java.util.Optional;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import com.fasterxml.jackson.core.JsonProcessingException;

public class JSonTest2 {

public static void main(String[] args) 
        throws JsonProcessingException, IOException, ParseException {

    String jsonString="{\"field1\": \"value1\","
            + "\"field2\": \"value2\","
            + "\"field3\":{"
            + "\"field4\":\"value4\","
            + "\"field5\":\"value5\""
            + "},"
            + "\"field6\":[{"
            + "\"field7\":\"value7\","
            + "\"field8\":\"value8\""
            + "},{"
            + "\"field7\":\"value9\","
            + "\"field8\":\"value10\""
            + "}]"
            + "}";

    JSONParser jsonParser = new JSONParser();
    JSONObject jsonObject = (JSONObject) jsonParser.parse(jsonString);

    //System.out.println(jsonObject.containsKey("field1")); //true
    //System.out.println(jsonObject.containsKey("field3")); //true
    //System.out.println(jsonObject.containsKey("field10"));//false 
    String[] keyArray=new String[]{"field1","field3.field4","field6.field7"};
    for(String key:keyArray){
        searchKey(jsonObject,jsonObject,key.split("\\."));
        System.out.println("------------------");
    }



}

static void searchKey(JSONObject jsonObjectOrig,JSONObject jsonObjectNew, String[] key){
    if(key.length>1 &&
            jsonObjectNew.containsKey(key[0])){
        if(jsonObjectNew.get(key[0]).getClass()==JSONObject.class){
            jsonObjectNew=(JSONObject) jsonObjectNew.get(key[0]);
        }else{
            //Assume it is JsonArray
            JSONArray jsonArray=(JSONArray) jsonObjectOrig.get(key[0]);
            for(int i=0;i<jsonArray.size();i++){
                searchKey(jsonObjectOrig,(JSONObject) jsonArray.get(i),
                        Arrays.copyOfRange(key, 1, key.length));
            }
        }
        key=Arrays.copyOfRange(key, 1, key.length);
        searchKey(jsonObjectOrig,jsonObjectNew,key);
    }

    if(jsonObjectNew!=null &&  jsonObjectNew.containsKey(key[0])){
        System.out.println("Key  is : "+ key[0] );
        System.out.println("Key value is : "+ jsonObjectNew.get(key[0]) );
    }

}


}

如何在Java中的JSON对象中对键应用过滤器

1 个答案: