org json simple JSONArray cannot be cast to org json simple JSONObject

Question

I m trying to parse below json file     units     id  42                     title   Hello World                  position  1       v id  9       sites      id  316         article  42         clip  133904                      length  5                 This is what I have tried   Object obj   null  JSONParser parser   new JSONParser    Object unitsObj   parser parse new FileReader  file json    JSONObject unitsJson    JSONObject  unitsObj   JSONArray units    JSONArray  unitsJson get  units    Iterator lt String gt  unitsIterator   units iterator    while unitsIterator hasNext                  Object uJson   unitsIterator next        JSONObject uj    JSONObject  uJson      obj    parser parse uj get  sites   toString         JSONArray jsonSites    JSONArray   obj       for int i 0 i lt jsonSites size   i          JSONObject site    JSONObject jsonSites get i      Exception happens here       System out println site get  article              The code is not working when I try to parse the inner json array  so I get   Exception in thread  main  java lang ClassCastException  org json simple JSONArray cannot be cast to org json simple JSONObject   The exception is pointing to this line   JSONObject site    JSONObject jsonSites get i     Any help  tnx

User · Answer

You can first read the whole content of file into a String.

FileInputStream fileInputStream = null;
String data="";
StringBuffer stringBuffer = new StringBuffer("");
try{
    fileInputStream=new FileInputStream(filename);
    int i;
    while((i=fileInputStream.read())!=-1)
    {
        stringBuffer.append((char)i);
    }
    data = stringBuffer.toString();
}
catch(Exception e){
        LoggerUtil.printStackTrace(e);
}
finally{
    if(fileInputStream!=null){  
        fileInputStream.close();
    }
}

Now You will have the whole content into String ( data variable ).

JSONParser parser = new JSONParser();
org.json.simple.JSONArray jsonArray= (org.json.simple.JSONArray) parser.parse(data);

After that you can use jsonArray as you want.

User · Answer

JSONObject obj  JSONObject JSONValue parse content    JSONArray arr  JSONArray obj get  units     System out println arr get 1       this will print   id  42    sities        cyberz is right but explain it reverse

User · Answer

use your jsonsimpleobject direclty like below  JSONObject unitsObj   parser parse new FileReader  file json

User · Answer

I ve found a working code   JSONParser parser   new JSONParser    Object obj    parser parse content   JSONArray array   new JSONArray    array add obj

User · Answer

If you want to re-filter the json data you can use following method  Given example is getting all document data from couchdb         Gson gson   new Gson        String resultJson   restTemplate getForObject url   all docs include docs true   String class       JSONObject object     JSONObject  new JSONParser   parse resultJson       JSONArray rowdata    JSONArray  object get  rows           List lt Object gt list new ArrayList lt Object gt            for int i 0 i lt rowdata size   i              JSONObject index    JSONObject  rowdata get i           JSONObject data    JSONObject  index get  doc            list add data                      convert your list to json     String devicelist   gson toJson list       return devicelist

User · Answer

JSONObject site jsonSites getJSONObject i  should work out

User · Answer

JSONObject baseReq LinkedHashMap insert    LinkedHashMap  baseReq get  insert    LinkedHashMap delete    LinkedHashMap  baseReq get  delete

User · Answer

this worked   System out println  resultList toString       resultList               org json JSONObject obj   new JSONObject resultList               org json JSONArray jsonArray   obj getJSONArray someField                for int i 0 i lt jsonArray length   i                     System out println  array is     jsonArray get i

User · Answer

JSONObject site    JSONObject jsonSites get i      Exception happens here    The return type of jsonSites get i  is JSONArray not JSONObject  Because sites have two      two means there are two arrays here

User · Answer

The first element of the sites array is an array  as you can see indenting the JSON     units     id  42                              sites                                      id  316             article  42             clip  133904                            length  5                    Therefore you need to treat its value accordingly  probably you could do something like   JSONObject site    JSONObject    JSONArray jsonSites get i   get 0

[java] org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject

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