Parsing JSON in Java with org.Json?

问题

I am having a lot of tourble with this. I am trying to work on an updater and i am using an api that returns this from a url.: JSON

[
   {
      "downloadUrl":"URL",
      "fileName":"Name",
      "gameVersion":"Version",
      "name":"Name",
      "projectId":ID,
      "releaseType":"beta"
   },
   {
      "downloadUrl":"URL",
      "fileName":"Name",
      "gameVersion":"Version",
      "name":"Name",
      "projectId":ID,
      "releaseType":"beta"
   }
]

How can i get The Data out of this JSON returned by the URL. I do not want to use and "3rd Party" Parsers. Thanks. Also, i was stuck on this part:

I know i need to loop though an array, but there is no main array, unless it is "". ? That is what confused me. How can i parse this JSON from a url?

I saw someone did it like this, but idk if that will owrk in my JSON? Parsing JSON Object in Java

回答1:

In this case, your data is an array of objects, which can be stored to a HashMap object. Therefore we will retrieve each object in your array and add them into each HashMap. The HashMap works by using using a key to insert a value, i.e. HashMap<key type,value type>. To store a value with a key, you use HashMap.put(key,value) for example, map.put("downloadUrl", "URL")

// Remove the spacings yourself before trying the code
JSONArray array = new JSONArray("[
   {
      "downloadUrl":"URL",
      "fileName":"Name",
      "gameVersion":"Version",
      "name":"Name",
      "projectId":ID,
      "releaseType":"beta"
   },
   {
      "downloadUrl":"URL",
      "fileName":"Name",
      "gameVersion":"Version",
      "name":"Name",
      "projectId":ID,
      "releaseType":"beta"
   }
]");

List<HashMap<String,String>> list = new ArrayList<HashMap<String,String>();
for(int i = 0 ; i < array.length() ; i++){
    HashMap<String,String> ht = new HashMap<String,String>();
    JSONObject o = json.getJSONObject(i);
    map.put("downloadUrl",o.getString("downloadUrl");
    map.put("fileName",o.getString("fileName");
    map.put("gameVersion",o.getString("gameVersion");
    map.put("name",o.getString("Name"));
    map.put("projectId",o.getString("projectId");
    map.put("releaseType",o.getString("releaseType");
    list.add(map);
}

来源：https://stackoverflow.com/questions/19483891/parsing-json-in-java-with-org-json

标签

java

json

parsing

org.json