解析 Chrome 书签 Json 文件：Java

目前我正在使用 netbeans IDE。我尝试使用其他解决方案，但到目前为止没有运气。

问题是，我在尝试时遇到错误读取Json文件来自谷歌 Chrome 书签文件(C:\Users\Admin\AppData\Local\Google\Chrome\用户数据\默认\书签)

p/s：虽然Bookmarks的名字里没有写任何文件类型，但是它的内容已经被称为JSON

这是 Bookmarks.json 中的内容：

{
   "checksum": "20fdfad51db6d3199f8a09c3220dd93b",
   "roots": {
      "bookmark_bar": {
         "children": [ {
            "date_added": "13124893413824227",
            "id": "6",
            "name": "YouTube",
            "type": "url",
            "url": "https://www.youtube.com/"
         }, {
            "date_added": "13124893435163243",
            "id": "7",
            "name": "Welcome to Facebook",
            "type": "url",
            "url": "https://www.facebook.com/"
         } ],
         "date_added": "13124893381424539",
         "date_modified": "13124893435163243",
         "id": "1",
         "name": "Bookmarks bar",
         "type": "folder"
      },
      "other": {
         "children": [  ],
         "date_added": "13124893381424547",
         "date_modified": "0",
         "id": "2",
         "name": "Other bookmarks",
         "type": "folder"
      },
      "synced": {
         "children": [  ],
         "date_added": "13124893381424550",
         "date_modified": "0",
         "id": "3",
         "name": "Mobile bookmarks",
         "type": "folder"
      }
   },
   "version": 1
}

这是我的代码（JsonParser.java）：

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class JsonParser{
    private static String jsonFile = "C:\\Users\\Admin\\AppData\\Local\\Google\\Chrome\\User Data\\Default\\Bookmarks";

    public static void main (String[] args) {

        try {
            FileReader reader = new FileReader (jsonFile); //access the file
            JSONObject jsonObject = (JSONObject) new JSONParser().parse(reader);

                      String c =(String) jsonObject.get("checksum"); //place
            //        String r =(String) jsonObject.get("roots"); //place

           //   String r =(String) jsonObject.get("children"); //place


                        System.out.println("check: " + c);
                        //System.out.println("roots: " + r);
                       JSONArray lang = (JSONArray) jsonObject.get("roots"); 
            for (int i=0; i<lang.size(); i++) {
            System.out.println ("Url Name : " + lang.get(i)+"\n");
            }       //data in the array
            }  catch (FileNotFoundException e) {
                                e.printStackTrace();
                    } catch (IOException e) {
                                e.printStackTrace();
                    } catch (ParseException e) {
                                e.printStackTrace();
                    }
    }
}

由于某种原因，当我运行代码时，出现以下错误：

check: 4d55f8a0888f7dd918a702eda2821ccd
Exception in thread "main" java.lang.ClassCastException: org.json.simple.JSONObject cannot be cast to org.json.simple.JSONArray
at JsonParser.main(JsonParser.java:28)
C:\Users\Admin\Documents\NetBeansProjects\Keep-It\nbproject\build-impl.xml:1051: The following error occurred while executing this line:
C:\Users\Admin\Documents\NetBeansProjects\Keep-It\nbproject\build-impl.xml:805: Java returned: 1
BUILD FAILED (total time: 2 seconds)

正如你所看到的，只有checksum成功被读取，但是roots失败并给出了这些错误。

您还应该注意到，我放置了一些代码comments，这些是我尝试过但仍然出现错误的事情。

我希望任何人都可以帮助我让这些事情发挥作用。 非常感谢您的帮助

问题是，你不能像这样将对象转换为数组(JSONArray) jsonObject.get("roots");您必须遵循结构，因此根据对象和数组进行解析，如下所示

 JSONObject jsonObject = (JSONObject) new JSONParser().parse(reader);
 String checksum =jsonObject.optString("checksum");

 //  get root object
 JSONObject root = jsonObject.getJSONObject("roots");

 //  get root bookmarks object from root
 JSONObject bookmarks = root.getJSONObject("bookmark_bar");

 //  get root children array from bookmarks 
 JSONArray  childrens = bookmarks.getJSONArray("children");

 JSONObject temp ;
  for (int i=0; i<childrens.size(); i++) {
      // get object using index from childrens array
      temp = childrens.getJSONObject(i);

      // get url
      String url = temp.optString("url");
  }

当你的结构遵循

JObject => root 
               root  JSONObject has : bookmark_bar JSONObject 
               bookmark_bar JSONObject has  : children JSONArray
               children JSONArray has JSONObject which further has String: url