Databases
StackOverflow2013
Postsdbo
POAccessing JSON property name using java
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAccessing JSON property name using java
    primarykey
    data
    text
    <p>I'm working on a way to parse JSON files and collect their contents for use elsewhere. I currently have a working example that is as follows:</p> <pre><code>import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; public class testJSONParser { public static void main(String[] args) throws Exception { List&lt;Map&lt;String, String&gt;&gt; jsonArray = new ArrayList&lt;Map&lt;String, String&gt;&gt;(); BufferedReader br = new BufferedReader(new FileReader("json.txt")); try { String line = br.readLine(); while (line != null) { JSONObject jsonObject = (JSONObject)new JSONParser().parse(line); Map&lt;String, String&gt; currentLineMap = new HashMap&lt;String, String&gt;(); currentLineMap.put("country", jsonObject.get("country").toString()); currentLineMap.put("size", jsonObject.get("size").toString()); currentLineMap.put("capital", jsonObject.get("capital").toString()); jsonArray.add(currentLineMap); line = br.readLine(); } } catch (FileNotFoundException fnfe) { fnfe.printStackTrace(); } catch (IOException ioe) { ioe.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } finally { br.close(); }; } } } </code></pre> <p>I'm using the <strong>json simple</strong> library for parsing the passed in JSON strings.</p> <p>Here's a sample string from the parsed file.</p> <pre><code>{"**country**":"Canada","**size**":"9,564,380","**capital**":"Ottawa"} </code></pre> <p>What my question is about is how to take this code, and have the put method be able to assign to the corresponding Map dynamically. This is what I currently have:</p> <pre><code>for (int i = 0; i &lt; jsonObject.size(); i++) { currentLineMap.put(jsonObject.???.toString(), jsonObject.get(i).toString()); } </code></pre> <p>The ??? part is where I'm stumped. Getting the values of the current JSON line is easy enough. But how to get the property values (highlighted in bold in the JSON string sample) eludes me. Is there a method that I can call on this object that I'm not familiar with? A different and better way to itenerate through this? Or am I doing this completely assbackwards right from the get go?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. UScanadiancreed
    1. UScanadiancreed
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAccessing JSON property name using java
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POAccessing JSON property name using java
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload