Convert JSONArray to String Array

Question

I want to ask a question about converting a jsonArray to a StringArray on Android  Here is my code to get jsonArray from server   try       DefaultHttpClient defaultClient   new DefaultHttpClient        HttpGet httpGetRequest   new HttpGet  http   server android listdir php        HttpResponse httpResponse   defaultClient execute httpGetRequest        BufferedReader reader   new BufferedReader new InputStreamReader httpResponse getEntity   getContent    UTF-8          String json   reader readLine           JSONObject jsonObject   new JSONObject json       JSONArray jsonArray   new JSONArray json       Log d     json          Toast makeText getApplicationContext    json  Toast LENGTH SHORT  show       catch  Exception e           TODO Auto-generated catch block     e printStackTrace        And this is the JSON           name    IMG 20130403 140457 jpg          name   IMG 20130403 145006 jpg          name   IMG 20130403 145112 jpg          name   IMG 20130404 085559 jpg          name   IMG 20130404 113700 jpg          name   IMG 20130404 113713 jpg          name   IMG 20130404 135706 jpg          name   IMG 20130404 161501 jpg          name   IMG 20130405 082413 jpg          name   IMG 20130405 104212 jpg          name   IMG 20130405 160524 jpg          name   IMG 20130408 082456 jpg          name   test jpg       How can I convert jsonArray that I ve got to StringArray so I can get StringArray like this   array     IMG 20130403 140457 jpg   IMG 20130403 145006 jpg            test jpg      Thank you for your help

User · Answer

Bit late for an answer  but here s what I came up with using Gson   for a jsonarray foo     test    bar      test    bar2     JsonArray foo   getJsonFromWherever    String   test   new String foo size    foo forEach x - gt   test   ArrayUtils add test  x get  test   getAsString

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Simplest and correct code is   public static String   toStringArray JSONArray array        if array  null          return null       String   arr new String array length         for int i 0  i lt arr length  i              arr i  array optString i             return arr      Using List lt String gt  is not a good idea  as you know the length of the array  Observe that it uses arr length in for condition to avoid calling a method  i e  array length    on each loop

User · Answer

You might want to take a look at JSONArray toList    which returns a List containing Maps and Lists  which represent your JSON structure  So you can use it with Java Streams like this   JSONArray array   new JSONArray jsonString   List lt String gt  result   array toList   stream            filter Map class  isInstance           map Map class  cast           map o - gt  o get  name             filter String class  isInstance           map String class  cast           collect Collectors toList       This might just be useful even for more complex objects   Alternatively you can just use an IntStream to iterate over all items in the JSONArray and map all names   JSONArray array   new JSONArray jsonString   List lt String gt  result   IntStream range 0  array length             mapToObj array  getJSONObject           map o - gt  o getString  name             collect Collectors toList

User · Answer

I do post an answer here for the question here that was closed even though the asnwers here helped  but were not sufficient   So  this is in order to get a json array to a String   using jsonsimple   According to the  marvelous  decode examples and docs  JSONArrays are java List  so we can access List methods   From there  is it possible to transform it to a String   with the following       JSONObject assemblingTags    JSONObject  obj get  assembling-tags        JSONArray aTagsList    JSONArray  assemblingTags get  list        String   tagsList    String    aTagsList stream   toArray String    new

User · Answer

There you go   String tempNames   jsonObj names   toString      String   types   tempNames substring 1  tempNames length  -1  split         remove   and     then split by

User · Answer

You can loop to create the String   List lt String gt  list   new ArrayList lt String gt     for  int i 0  i lt jsonArray length    i          list add  jsonArray getString i       String   stringArray   list toArray new String list size

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You can input json array to this function get output as string array     example Input -                      gender      male    female                             output -   male    female     private String   convertToStringArray Object array  throws Exception      return StringUtils stripAll array toString   substring 1  array toString   length  -1  split

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public static String   getStringArray JSONArray jsonArray        String   stringArray   null      if  jsonArray    null            int length   jsonArray length            stringArray   new String length           for  int i   0  i  lt  length  i                  stringArray i    jsonArray optString i                       return stringArray

User · Answer

Was trying one of the same scenario but found one different and simple solution to convert JSONArray into List  import java lang reflect Type  import com google gson Gson  import com google gson reflect TypeToken   String jsonStringArray    quot    quot JSON  quot    quot To  quot    quot Java  quot   quot                           creating Gson instance to convert JSON array to Java array                         Gson converter   new Gson                          Type type   new TypeToken lt List lt String gt  gt      getType        List lt String gt  list    converter fromJson jsonStringArray  type     Give a try

User · Answer

The below code will convert the JSON array of the format         version   70 3 0 3     version   6R 16B000I J4 3     version   46 3 0 3     version   20 3 0 2     version   4 1 3 0     version   10 3 0 1      to List of String      70 3 0 3  6R 16B000I J4 3  46 3 0 3  20 3 0 2  4 1 3 0  10 3 0 1    Code    ObjectMapper mapper   new ObjectMapper    ArrayNode node    ArrayNode mapper readTree dataFromDb   data   node findValuesAsText  version        version  is the node in the JSON  and use com fasterxml jackson databind ObjectMapper

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Here is the code        XXX satisfies only with this particular string format         String s        name     IMG 20130403 140457 jpg       name     IMG 20130403 145006 jpg       name     IMG 20130403 145112 jpg       name     IMG 20130404 085559 jpg       name     IMG 20130404 113700 jpg       name     IMG 20130404 113713 jpg       name     IMG 20130404 135706 jpg       name     IMG 20130404 161501 jpg       name     IMG 20130405 082413 jpg       name     IMG 20130405 104212 jpg       name     IMG 20130405 160524 jpg       name     IMG 20130408 082456 jpg       name     test jpg               s   s replace          replace                   s   s substring 1  s length   - 1           String   split   s split                       for  String string   split                System out println string

User · Answer

Using only the portable JAVA API  http   www oracle com technetwork articles java json-1973242 html        try  JsonReader reader   Json createReader new StringReader yourJSONresponse              JsonArray arr   reader readArray             List lt String gt  l   arr getValuesAs JsonObject class               stream   map o - gt  o getString  name    collect Collectors toList

User · Answer

String   arr   jsonArray toString   replace              split

User · Answer

A ready-to-use method         Convert JSONArray to ArrayList lt String gt         param jsonArray JSON array     return String array     public static ArrayList lt String gt  toStringArrayList JSONArray jsonArray       ArrayList lt String gt  stringArray   new ArrayList lt String gt       int arrayIndex    JSONObject jsonArrayItem    String jsonArrayItemKey     for       arrayIndex   0      arrayIndex  lt  jsonArray length        arrayIndex           try         jsonArrayItem           jsonArray getJSONObject            arrayIndex          jsonArrayItemKey           jsonArrayItem getString             name           stringArray add          jsonArrayItemKey         catch  JSONException e          e printStackTrace                 return stringArray

User · Answer

Take a look at this tutorial  Also you can parse above json like    JSONArray arr   new JSONArray yourJSONresponse   List lt String gt  list   new ArrayList lt String gt     for int i   0  i  lt  arr length    i         list add arr getJSONObject i  getString  name

[java] Convert JSONArray to String Array

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