解析Chrome书签JSON文件:Java



当前我正在使用NetBeans IDE。我尝试使用其他解决方案,但到目前为止尚无运气。

问题是,我在尝试读取JSON文件时会面临错误默认书签)

p/s:尽管没有书签名称编写的文件类型,但其内容被称为json

这是书签内的内容:

{
   "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,这些是我遇到的错误:

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:UsersAdminDocumentsNetBeansProjectsKeep-Itnbprojectbuild-impl.xml:1051: The following error occurred while executing this line:
C:UsersAdminDocumentsNetBeansProjectsKeep-Itnbprojectbuild-impl.xml:805: Java returned: 1
BUILD FAILED (total time: 2 seconds)

您可以看到,仅 checksum 成功地被阅读,但是 roots 失败了这些错误。

您还应该注意到,我将一些代码称为注释,这些是我尝试过的事情,但仍然有错误。

我希望任何人都可以帮助我使这些事情有效。非常感谢您的帮助

问题是,您不能像 (JSONArray) jsonObject.get("roots");这样的数组施放对象。

 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");
  }

当您的结构遵循

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

根不是jsonarray,而是jsonobject。

所以你要做的是

JSONObject lang = jsonObject.get("roots"); 

,然后您在对象中的所有键都过于循环:

  • bookmark_bar
  • 其他
  • 同步

在我看来,"根"不是一个数组,而是看json时的对象。" bookmark_bar"下的"儿童"是一个数组,但是

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