Accessing members of items in a JSONArray with Java

Question

I m just getting started with using json with java   I m not sure how to access string values within a JSONArray  For instance  my json looks like this        locations          record                      id   8817           loc    NEW YORK CITY                            id   2873           loc    UNITED STATES                            id   1501          loc    NEW YORK STATE                        my code   JSONObject req   new JSONObject join loadStrings data json        JSONObject locs   req getJSONObject  locations    JSONArray recs   locs getJSONArray  record      I have access to the  record  JSONArray at this point  but am unsure as to how I d get the  id  and  loc  values within a for loop   Sorry if this description isn t too clear  I m a bit new to programming

User · Answer

HashMap regs    HashMap  parser parse stringjson     String   HashMap regs get  firstlevelkey    get  secondlevelkey

User · Answer

Java 8 is in the market after almost 2 decades  following is the way to iterate org json JSONArray with java8 Stream API   import org json JSONArray  import org json JSONObject    Test public void access org JsonArray           Given  array     JSONArray jsonArray   new JSONArray Arrays asList new JSONObject                      new HashMap                              put  a   100                           put  b   200                                                     new JSONObject                      new HashMap                              put  a   300                           put  b   400                                                  Then  convert to List lt JSONObject gt      List lt JSONObject gt  jsonItems   IntStream range 0  jsonArray length                 mapToObj index - gt   JSONObject  jsonArray get index                collect Collectors toList             you can access the array elements now     jsonItems forEach arrayElement - gt  System out println arrayElement get  a             prints 100  300     If the iteration is only one time   no need to  collect       IntStream range 0  jsonArray length                 mapToObj index - gt   JSONObject  jsonArray get index                forEach item - gt                   System out println item

User · Answer

Have you tried using JSONArray getJSONObject int   and JSONArray length   to create your for-loop   for  int i   0  i  lt  recs length      i        JSONObject rec   recs getJSONObject i       int id   rec getInt  id        String loc   rec getString  loc

User · Answer

In case it helps someone else   I was able to convert to an array by doing something like this    JSONObject jsonObject    JSONObject new JSONParser   parse jsonString     JSONArray  jsonObject  toArray        or you should be able to get the length     JSONArray  myJsonArray  toArray   length

User · Answer

By looking at your code  I sense you are using JSONLIB  If that was the case  look at the following snippet to convert json array to java array     JSONArray jsonArray    JSONArray  JSONSerializer toJSON  input       JsonConfig jsonConfig   new JsonConfig       jsonConfig setArrayMode  JsonConfig MODE OBJECT ARRAY       jsonConfig setRootClass  Integer TYPE       int   output    int    JSONSerializer toJava  jsonArray  jsonConfig

User · Answer

An org json JSONArray is not iterable  Here s how I process elements in a net sf json JSONArray       JSONArray lineItems   jsonObject getJSONArray  lineItems        for  Object o   lineItems            JSONObject jsonLineItem    JSONObject  o          String key   jsonLineItem getString  key            String value   jsonLineItem getString  value                        Works great

[java] Accessing members of items in a JSONArray with Java

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