JsonRewriter.java

package com.squareup.okhttp.sample;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.Map;

public class JsonRewriter {
  public static void main(String[] args) throws Exception {
    String file = "...";
    InputStream in = new FileInputStream(file);
    Reader reader = new InputStreamReader(in, "utf-8");
    Gson gson = new GsonBuilder()
        .setPrettyPrinting()
        .disableHtmlEscaping()
        .create();
    JsonElement jsonElement = gson.fromJson(reader, JsonElement.class);
    jsonElement = transform("", jsonElement);
    Writer writer = new OutputStreamWriter(new FileOutputStream(file + "2"), "utf-8");
    gson.toJson(jsonElement, writer);
    writer.close();
  }

  private static JsonElement transform(String path, JsonElement jsonElement) {
    if (jsonElement instanceof JsonObject) {
      JsonObject object = (JsonObject) jsonElement;
      JsonObject result = new JsonObject();
      for (Map.Entry<String, JsonElement> entry : object.entrySet()) {
        result.add(entry.getKey(), transform(path + "." + entry.getKey(), entry.getValue()));
      }
      return result;
    } else if (jsonElement instanceof JsonArray) {

      JsonArray result = new JsonArray();
      JsonArray array = (JsonArray) jsonElement;
      for (int i = 0; i < array.size(); i++) {
        result.add(transform(path + "[" + i + "]", array.get(i)));
      }
      return result;
    } else {
      System.out.println(path + ": " + jsonElement);
      return jsonElement;
    }
  }
}