如何将 json 输出保存在 String 对象中。重复数据写入所有拆分的文件中？

Posted 2023-02-25

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【中文标题】如何将 json 输出保存在 String 对象中。重复数据写入所有拆分的文件中？【英文标题】：How to save the json output in a String object.Duplicate data is written in all the splitted files? 【发布时间】：2016-05-03 21:50:16 【问题描述】：

我正在拆分一个 Json 文件并将每个 Json 对象写入一个单独的文件，但我想将每个拆分的 Json 对象保存到一个字符串对象。不知道该怎么做。

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

public class TweetTestStack 
public static void main(String[] args) throws Exception 
    String filePath = "/home/system5/Videos/Main.json";
    try (
            //BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(is)))
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), StandardCharsets.UTF_8)))
      //  BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), "UTF-8"))) 
        JSONTokener tokener = new JSONTokener(reader);
        JSONArray a = new JSONArray(tokener);

        for (int i = 0; i < a.length(); ++i) 
            flushFile((JSONObject) a.get(0), i);
        
    

 public static void flushFile(JSONObject obj, int d) throws Exception 
    try (FileOutputStream output = new FileOutputStream("/home/system5/Music/obj-" + d + ".json");
         Writer writer = new OutputStreamWriter(output, "UTF-8")) 
        obj.write(writer);

示例文件：

["created_at":"Thu Jan 07 11:14:54 +0000 2016","id":685057015547220000,"id_str":"685057015547219968","text":"RT @makeinindia: Calling all techies! Collaborate, brainstorm &amp; solve urban design problems at Hackathon 2016 #MakeInIndia Week https://t.c…","source":"<a href=\"http://twitter.com\" rel=\"nofollow\">Twitter Web Client</a>","truncated":false,"in_reply_to_status_id":null,"in_reply_to_status_id_str":null,"in_reply_to_user_id":null,"in_reply_to_user_id_str":null,"in_reply_to_screen_name":null,"user":"id":3479265073,"id_str":"3479265073","name":"dilip bobby","screen_name":"heymailme143","location":"","description":"","url":null,"entities":"description":"urls":[],"protected":false,"followers_count":10,"friends_count":35,"listed_count":3,"created_at":"Mon Sep 07 07:11:18 +0000 2015","favourites_count":1,"utc_offset":-28800,"time_zone":"Pacific Time (US & Canada)","geo_enabled":true,"verified":false,"statuses_count":309,"lang":"en","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"C0DEED","profile_background_image_url":"http://abs.twimg.com/images/themes/theme1/bg.png","profile_background_image_url_https":"https://abs.twimg.com/images/themes/theme1/bg.png","profile_background_tile":false,"profile_image_url":"http://abs.twimg.com/sticky/default_profile_images/default_profile_4_normal.png","profile_image_url_https":"https://abs.twimg.com/sticky/default_profile_images/default_profile_4_normal.png","profile_link_color":"0084B4","profile_sidebar_border_color":"C0DEED","profile_sidebar_fill_color":"DDEEF6","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":true,"default_profile_image":true,"following":false,"follow_request_sent":false,"notifications":false,"geo":null,"coordinates":null,"place":null,"contributors":null,"retweeted_status":"created_at":"Sun Dec 20 12:47:16 +0000 2015","id":678557275829592000,"id_str":"678557275829592064","text":"Calling all techies! Collaborate, brainstorm &amp; solve urban design problems at Hackathon 2016 #MakeInIndia Week https://t.co/ojP9Ih4p2Z","source":"<a href=\"http://twitter.com\" rel=\"nofollow\">Twitter Web Client</a>","truncated":false,"in_reply_to_status_id":null,"in_reply_to_status_id_str":null,"in_reply_to_user_id":null,"in_reply_to_user_id_str":null,"in_reply_to_screen_name":null,"user":"id":2785480981,"id_str":"2785480981","name":"Make in India","screen_name":"makeinindia","location":"","description":"To register for Make in India Week, click here 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【问题讨论】：

你可以通过obj.toString()获取JSON字符串。这有帮助吗？ ***.com/questions/216894/… 使用 ByteArrayOutputStream 而不是 FileOutputStream 【参考方案1】：

只是一个小错误，把0改成i即可；（分割后的文件没有发现重复）

    for (int i = 0; i < a.length(); ++i) 
        flushFile((JSONObject) a.get(i), i);

并将每个分割的 json 保存在一个字符串中：执行以下从 void 到 String 的更改。

public static String flushFile(JSONObject obj, int d) throws Exception 
String s=obj.toString();
return s;

【讨论】：

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