일치하는 정규 표현식을 올바르게 바꾸는 방법

Question

로컬 디렉토리에서 JSON 피드를 읽고 다른 파일에 저장하기 전에 수정하고 싶습니다.

This is the online version of the JSON feed

구조는 같다 : 이미 문제의 제목을지도

[ 
    { 
    "title":"chapter Title", 
    "arr":[ 
      { 
      "title":"SubChapter Title",   
      "arr":[ 
        [ 
         "Sub Sub Chapter Title", 
         272, "This is a title", 
         1124, "This is another title", 
         10550, ".....", 
         11044, "......", 
         -11172, "......", 
         ...... 
        ], 
        ........ 
      ............ 
     ........... 
....... 

:

[ 
    { 
    "title":"chapter Title", 
    "arr":[ 
      { 
      "title":"SubChapter Title",   
      "arr":[ 
        [ 
         "Sub Sub Chapter Title", 
         272, 
         1124, 
         10550, 
         11044, 
         -11172, 
         ...... 
        ], 
        ........ 
      ............ 
     ........... 
....... 

내가 같은 기존 JSON 파일에 어떤 문제와 함께 문제의 제목을 추가 할 필요가 없습니다 그들을 추가하는 데 문제가 있습니다. 피드 문자열을 읽고 problem No을 찾아 problem No으로 바꾸고 problem Title으로 바꿉니다. 이것은 내 시도 코드입니다.

import java.io.BufferedReader; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.UnsupportedEncodingException; 
import java.nio.charset.Charset; 
import java.nio.charset.StandardCharsets; 
import java.nio.file.Files; 
import java.nio.file.Path; 
import java.nio.file.Paths; 
import java.util.HashMap; 
import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
import java.util.regex.PatternSyntaxException; 

import com.google.gson.stream.JsonReader; 

public class JacksonStreamAPIExample { 

    static String PROBLEM_LIST_FILE_PATH = "F:\\problemList.txt"; 
    static String COMPETITIVE_PROGRAMMING_BOOK_PATH = "F:\\competitive_programming_edition_3.json"; 
    static String TARGET_PATH = "F:\\target.json"; 

    static HashMap<Integer, String> problems = new HashMap<Integer, String>(); 

    public static void main(String[] args) { 
     // Mapping problem No with problem Title 
     InputStream is = null; 
     try { 
      is = new FileInputStream(PROBLEM_LIST_FILE_PATH); 
     } catch (FileNotFoundException e1) { 

     } 
     JsonReader reader = null; 
     try { 
      reader = new JsonReader(new InputStreamReader(is, "UTF-8")); 
     } catch (UnsupportedEncodingException e1) { 

     } 
     try { 
      reader.beginArray(); 
      while (reader.hasNext()) { 
       reader.beginArray(); 
       reader.skipValue(); 
       problems.put(reader.nextInt(), reader.nextString()); 
       reader.skipValue(); 
       while (reader.hasNext()) 
        reader.skipValue(); 
       reader.endArray(); 
      } 
      reader.endArray(); 
      reader.close(); 
     } catch (IOException e) { 
     } 

     // Reading and modifying 
     InputStream inputStream = null; 
     try { 
      inputStream = new FileInputStream(COMPETITIVE_PROGRAMMING_BOOK_PATH); 
     } catch (FileNotFoundException e) { 
      System.out.println("file not found!"); 
     } 
     InputStreamReader isr = null; 
     isr = new InputStreamReader(inputStream, StandardCharsets.UTF_8); 
     BufferedReader read = new BufferedReader(isr, 8); 
     StringBuilder sb = new StringBuilder(); 
     String line = null; 
     try { 
      while ((line = read.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
     } catch (IOException e) { 
     } 
     try { 
      inputStream.close(); 
     } catch (IOException e) { 

     } 
     String jsonString = sb.toString(); 

     try { 
      String regex = ", (-?\\d+)"; 
      Pattern myPattern = Pattern.compile(regex); 
      Matcher regexMatcher = myPattern.matcher(jsonString); 

      while (regexMatcher.find()) { 
       for (int i = 1; i <= regexMatcher.groupCount(); i++) { 
       System.out.println("I want to add " + problems.get(Math.abs(Integer.parseInt(regexMatcher.group(i)))) + " after " + regexMatcher.group(i) + " in jsonString and write it in target file."); 
       } 
      } 
     } catch (PatternSyntaxException ex) { 

     } 
     Path path = Paths.get(TARGET_PATH); 
     try { 
      Files.write(path, jsonString.getBytes(StandardCharsets.UTF_8)); 
     } catch (IOException e) { 

     } 
    } 
} 

모두 괜찮습니다. 문제가 발생한 후 대체/추가 문제 제목 만 작동하지 않습니다. 어떻게해야합니까?

Answer 1

@Dave Newton이 맞습니다. JSONWriter 개체를 만들어 JSON으로 처리해야합니다. JSON을 JsonReader 인스턴스로 구문 분석하고 JsonWriter 순차로 추가하십시오. 또한 이미 완료된 매핑에서 problemTitle을 추가하십시오.

다행히도, 나는 당신을 대신하여 작업을 완료했습니다. 약간의 수정이 이루어지기를 바랍니다.

package demo; 

import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.nio.charset.StandardCharsets; 

import java.util.HashMap; 

import com.google.gson.stream.JsonReader; 
import com.google.gson.stream.JsonWriter; 

public class JacksonStreamAPIExample { 

    static String PROBLEM_LIST_FILE_PATH = "F:\\kaidul.txt"; 
    static String COMPETITIVE_PROGRAMMING_BOOK_PATH = "F:\\competitive_programming_edition_3.json"; 
    static String TARGET_PATH = "F:\\test.json"; 

    static HashMap<Integer, String> problems = new HashMap<Integer, String>(); 

    public static void main(String[] args) { 
     // Mapping problem No with problem Title 
     InputStream is = null; 
     try { 
      is = new FileInputStream(PROBLEM_LIST_FILE_PATH); 
     } catch (FileNotFoundException e) { 

     } 
     try { 
      JsonReader reader = new JsonReader(new InputStreamReader(is, StandardCharsets.UTF_8)); 
      reader.beginArray(); 
      while (reader.hasNext()) { 
       reader.beginArray(); 
       reader.skipValue(); 
       problems.put(reader.nextInt(), reader.nextString()); 
       reader.skipValue(); 
       while (reader.hasNext()) 
        reader.skipValue(); 
       reader.endArray(); 
      } 
      reader.endArray(); 
      reader.close(); 
     } catch (IOException e) { 
     } 

     // Reading and modifying 
     JsonWriter writer = null; 
     InputStream inputStream = null; 
     try { 
      inputStream = new FileInputStream(COMPETITIVE_PROGRAMMING_BOOK_PATH); 

      JsonReader reader = new JsonReader(new InputStreamReader(
        inputStream)); 
      writer = new JsonWriter(new FileWriter(TARGET_PATH)); 

      reader.beginArray(); // array #1 
      writer.beginArray(); 
      while (reader.hasNext()) { 
       reader.beginObject(); // object #2 
       writer.beginObject(); 
       while (reader.hasNext()) { 
        reader.skipValue(); 
        writer.name("title").value(reader.nextString()); 
        reader.skipValue(); 
        writer.name("arr"); 
        reader.beginArray(); // array #3 
        writer.beginArray(); 
        while (reader.hasNext()) { 
         reader.beginObject(); // object #4 
         writer.beginObject(); 
         while (reader.hasNext()) { 
          reader.skipValue(); 
          writer.name("title").value(reader.nextString()); 
          reader.skipValue(); 
          writer.name("arr"); 
          reader.beginArray(); // array #5 
          writer.beginArray(); 
          while (reader.hasNext()) { 
           reader.beginArray(); // array #6 
           writer.beginArray(); 
           writer.value(reader.nextString()); 
           while (reader.hasNext()) { 
            int problemNo = reader.nextInt(); 
            writer.value(problemNo); 
            writer.value(problems.get(Math.abs(problemNo))); // additional problemTitle 
           } 
           reader.endArray(); // array #6 
           writer.endArray(); 
          } 
          reader.endArray(); // array #5 
          writer.endArray(); 
         } 
         reader.endObject(); // object #4 
         writer.endObject(); 
        } 
        reader.endArray(); // array #3 
        writer.endArray(); 
       } 
       reader.endObject(); // object #2 
       writer.endObject(); 
      } 
      reader.endArray(); // array #1 
      writer.endArray(); 
      reader.close(); 
      writer.close(); 
     } catch (IOException e) { 
      // nothing 
     } finally { 
      if (inputStream != null) { 
       try { 
        inputStream.close(); 
       } catch (IOException e) { 
        // nothing 
       } 
      } 
     } 
    } 
}