How to parse JSON in Java

java, json, parsing

Solution

The org.json library is easy to use.

Just remember (while casting or using methods like `getJSONObject` and `getJSONArray`) that in JSON notation

- `[ … ]` represents an array, so library will parse it to `JSONArray`

- `{ … }` represents an object, so library will parse it to `JSONObject`

Example code below:

import org.json.*;

String jsonString = ... ; //assign your JSON String here
JSONObject obj = new JSONObject(jsonString);
String pageName = obj.getJSONObject("pageInfo").getString("pageName");

JSONArray arr = obj.getJSONArray("posts"); // notice that `"posts": [...]`
for (int i = 0; i < arr.length(); i++)
{
    String post_id = arr.getJSONObject(i).getString("post_id");
    ......
}

You may find more examples from: Parse JSON in Java

Downloadable jar: http://mvnrepository.com/artifact/org.json/json

Problem

I have the following JSON text. How can I parse it to get the values of `pageName`, `pagePic`, `post_id`, etc.? ``` { "pageInfo": { "pageName": "abc", "pagePic": "http://example.com/content.jpg" }, "posts": [ { "post_id": "123456789012_123456789012", "actor_id": "1234567890", "picOfPersonWhoPosted": "http://example.com/photo.jpg", "nameOfPersonWhoPosted": "Jane Doe", "message": "Sounds cool. Can't wait to see it!", "likesCount": "2", "comments": [], "timeOfPost": "1234567890" } ] } ```

Original source

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