將json轉換爲鍵值對中的文本的java代碼

Question

我是Java的新手，我想編寫一個代碼，將我的傳入json文件轉換爲將以管道分隔的鍵值對中的文本。 json文件中的模式往往會改變。所以我不能根據每個值編寫一個程序（我之前嘗試過）。

有人可以幫忙嗎？

的文件是：

[{"type_id":4102,"id":0,"product_name":"ATP:Endpoint","feature_name":"ATP:Endpoint", 
"feature_ver":"2014.2.0","atpProtocol":"av","device_uid":"D00A9450ABD85ACD2B0125968FEABBF9","device_ip":"10.75.81.205","device_name":"10.75.81.205","file":{"name":"CSIDL_PROFILE\\desktop\\av ping\\malheur_34_0\\malheur_34_0 - copy (4)","folder":"CSIDL_PROFILE\\desktop\\aving\\malheur_34_0","sha2":"BC44F53958886E6B220CA6C634D78703220139 
E968719A7459B859954CAA4A77","md5":null,"version":null,"size":null,"date_created":null,"date_modified":null,"date_accessed":null},"platform":{"processor":"x86 Family 6 Model 45 Stepping 7","country":"1","language":"English","system":"Windows 7 build 7601 Service Pack 1","scanner":"Symantec Endpoint Protection 12.1.3.0"},"scan":{"signatures_version":"20141112.002","technology":"AV Engine"}] 

Answer 1

我已經寫了一些方法來解析JSON字符串成圖/列表對象。

public static Map<String,Object> parseJSONObjectToMap(JSONObject jsonObject) throws JSONException{ 
    Map<String, Object> mapData = new HashMap<String, Object>(); 
    Iterator<String> keysItr = jsonObject.keys(); 
     while(keysItr.hasNext()) { 
      String key = keysItr.next(); 
      Object value = jsonObject.get(key); 

      if(value instanceof JSONArray) { 
       value = parseJSONArrayToList((JSONArray) value); 
      }else if(value instanceof JSONObject) { 
       value = parseJSONObjectToMap((JSONObject) value); 
      } 
      mapData.put(key, value); 
     } 
    return mapData; 
} 

public static List<Object> parseJSONArrayToList(JSONArray array) throws JSONException { 
    List<Object> list = new ArrayList<Object>(); 
    for(int i = 0; i < array.length(); i++) { 
     Object value = array.get(i); 
     if(value instanceof JSONArray) { 
      value = parseJSONArrayToList((JSONArray) value); 
     }else if(value instanceof JSONObject) { 
      value = parseJSONObjectToMap((JSONObject) value); 
     } 
     list.add(value); 
    } 
    return list; 
} 

Answer 2

所以我寫了一些通用的有點代碼，將用於將每個json文件輸入轉換爲管道分離。此外，這將讀取子節點和...請看看並測試自己。我認爲這對其他人有用。

package test; 

import java.io.File; 
import java.io.IOException; 
import java.nio.charset.StandardCharsets; 
import java.nio.file.*; 
import java.util.Iterator; 
import java.util.Map; 

import com.fasterxml.jackson.core.*; 
import com.fasterxml.jackson.databind.*; 

public class ParseSEPEvents { 

String endTime; 
long latestLiveVisitStartTime; 
boolean foundLatestVisitEndTime = false; 

public ParseSEPEvents() { 
} 

public static void main(String args[]) throws Exception{ 
    ParseSEPEvents obj = new ParseSEPEvents(); 
    String contents = new String(Files.readAllBytes(Paths.get("<FileLocation>"))); 

    int idx = contents.indexOf("json"); 
    String jsonStr = contents.substring(idx+5); 
    String header = contents.substring(0, idx+5); 
    StringBuilder returnStr = obj.logParser(jsonStr); 
    StringBuilder fnlStr = new StringBuilder(header).append(returnStr); 

    System.out.println(fnlStr); 
} 

private StringBuilder parseToken(JsonNode node) { 
    StringBuilder event = new StringBuilder(); 

    if (node == null) { 
     return event; 
    }  

    Iterator<Map.Entry<String, JsonNode>> itr = node.fields();  
    while (itr.hasNext()) { 
     Map.Entry<String, JsonNode> keyValue = itr.next(); 
     String keyStr = keyValue.getKey(); 
     JsonNode innerNode = node.findValue(keyStr);    

     if(innerNode.isValueNode()){ 
     event.append(keyValue.getKey()).append("|").append(innerNode.toString()).append("|"); 
     }else{ 
      StringBuilder eventChild = parseToken(innerNode); 
      event.append(keyValue.getKey()).append("[").append(eventChild).append("]"); 
     } 

    } 

    return event; 

} 

public StringBuilder logParser(String jsonStr) { 
    JsonParser parser = null; 
    StringBuilder strBuild = new StringBuilder(); 

    try { 
     JsonFactory factory = new MappingJsonFactory(); 
     System.out.println("Parsing file records."); 
     parser = factory.createParser(jsonStr); 

     JsonToken currentToken = parser.nextToken(); 
     if (currentToken != JsonToken.START_ARRAY) { 
      System.out.println("Warning: root should be object. quiting."); 
      return strBuild; 
     } 

     while ((parser.nextToken()) != JsonToken.END_ARRAY) { 
      currentToken = parser.nextToken(); 
      JsonNode node = parser.readValueAsTree(); 

      StringBuilder event = new StringBuilder(); 
      event = parseToken(node); 
      return new StringBuilder("|").append(event); 
     } 

    } catch (JsonParseException jpe) { 
     System.out.println("Unable to parse json records." 
       + jpe.getMessage()); 
    } catch (IOException ioe) { 
     System.out.println("Error while parsing file. " + ioe.getMessage()); 
    } finally { 
     try { 
      if ((parser != null) && !(parser.isClosed())) { 
       parser.close(); 
      } 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      } 
     } 

    return strBuild; 
    } 

}