Java json parse

Question

Well I've been trying for like 3 hours now. Using lots of apis it still doesn't work.

I'm trying to parse

{
 "id": 8029390,
 "uid": "fdABNhroHsr0",
 "user": {
 "username": "Skrillex",
 "permalink": "skrillex"
 },
 "uri": "/skrillex/cat-rats",
 "duration": 305042,
 "token": "VgA2a",
 "name": "cat-rats",
 "title": "CAT RATS",
 "commentable": true,
 "revealComments": true,
 "commentUri": "/skrillex/cat-rats/comments/",
 "streamUrl": "http://media.soundcloud.com/stream/fdABNhroHsr0?stream_token=VgA2a",
 "waveformUrl": "http://w1.sndcdn.com/fdABNhroHsr0_m.png",
 "propertiesUri": "/skrillex/cat-rats/properties/",
 "statusUri": "/transcodings/fdABNhroHsr0",
 "replacingUid": null,
 "preprocessingReady": null
}

in to an array/list. Any help?

• Sean Adkinson: Is that one entry in the list?
• G_H: What APIs or libraries have you been using? Why doesn't it work? What have you tried?
• Cakestep: gson, flexjson and a lot more. I'm a bit of a newbie when it comes to java (More of a php person <.<)
• Matt Fenwick: This is valid JSON according to python's json module. Do you mean that it won't parse, or that the contents don't meet your requirements?
• Cakestep: Well with gson it just said it couldn't deser' it. So yea, I kinda have no idea what's wrong.

Answer 1

I'm using Jackson from http://codehaus.org/ and so far it has lived up to all my needs.

You don't quite deal with json as raw strings in an arraylist, but rather as POJOs, here's a quick example with a subset of your json.

public class JacksonExample {
 public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
 String text = "{ \"id\": 8029390, \"user\": { \"username\": \"Skrillex\" } }";
 ObjectMapper mapper = new ObjectMapper();
 Pojo pojo = mapper.readValue(text, Pojo.class);
 System.out.println(pojo.id);
 System.out.println(pojo.user.username);
 }
}
class Pojo {
 public String id;
 public User user;
 public String getId() { return id; }
 public void setId(String id) { this.id = id; }
 public User getUser() { return user; }
 public void setUser(User user) { this.user = user; }
 public static class User {
 public String username;
 public String getUsername() { return username; }
 public void setUsername(String username) { this.username = username; }
 }
}

The mapper creates a Pojo object with the values filled in. Then you can use that object for anything you need.

Here are a couple of links for the Jackson project:

http://jackson.codehaus.org/

http://wiki.fasterxml.com/JacksonInFiveMinutes

The latest all in one JAR is here:

http://jackson.codehaus.org/1.9.1/jackson-all-1.9.1.jar

Answer 2

You should try JavaJson from source forge... you can parse that this way:

JsonObject json = JsonObject.parse("...");
/*
 * or also JsonObject.parse(inputStream);
 */
then you can get fields this way:
String title = json.getString("title");
String username = json.get("user", "username").toString();

and so on. here's the link: https://sourceforge.net/projects/javajson/